Fronius Ohmpilot Operating Instructions

1. Safety rules

1. Safety rules

• Injury or death to the operator or a third party
• Damage to the device and other material assets belonging to the operating company.

• Be suitably qualified
• Have knowledge of and experience in dealing with electrical installations and
• Have fully read and precisely followed these Operating Instructions

The Operating Instructions must always be at hand wherever the device is being used. In addition to the Operating Instructions, attention must also be paid to any generally applicable and local regulations regarding accident prevention and environmental protection.

• Must be kept in a legible state
• Must not be damaged
• Must not be removed
• Must not be covered, pasted or painted over

The terminals can reach high temperatures.

• Injury or death to the operator or a third party
• Damage to the device and other material assets belonging to the operating company

Any safety devices that are not fully functional must be repaired by an authorised specialist before the device is switched on.

Never bypass or disable protection devices.

For the location of the safety and danger notices on the device, refer to the section headed "General remarks" in the Operating Instructions for the device.

Any equipment malfunctions which might impair safety must be remedied before the device is turned on.

This is for your personal safety!

1. Safety rules

Operation or storage of the device outside the stipulated area will be deemed as not in accordance with the intended purpose. The manufacturer accepts no liability for any damage resulting from improper use.

1. Safety rules

The servicing information contained in these operating instructions is intended only for the use of qualified service engineers. An electric shock can be fatal. Do not carry out any actions other than those described in the documentation. This also applies to qualified personnel.

All cables and leads must be secured, undamaged, insulated and adequately dimensioned. Loose connections, scorched, damaged or inadequately dimensioned cables and leads must be immediately repaired by authorised personnel.

Maintenance and repair work must only be carried out by an authorised specialist.

It is impossible to guarantee that bought-in parts are designed and manufactured to meet the demands made on them, or that they satisfy safety requirements. Use only original spare parts (also applies to standard parts).

Do not carry out any alterations, installations, or modifications to the device without first obtaining the manufacturer's permission.

Components that are not in perfect condition must be changed immediately.

1. Safety rules

The maximum sound power level of the inverter is specified in the Technical Data.

The device is cooled as quietly as possible with the aid of an electronic temperature control system; this depends on the amount of converted power, the ambient temperature, the level of soiling of the device, etc.

It is not possible to provide a workplace-related emission value for this device because the actual sound pressure level is heavily influenced by the installation situation, the power quality, the surrounding walls and the properties of the room in general.

1. Safety rules

In certain cases, even though a device complies with the standard limit values for emissions, it may affect the application area for which it was designed (e.g., when there is equipment that is susceptible to interference at the same location, or if the site where the device is installed is close to either radio or television receivers). If this is the case, then the operator is obliged to take action to rectify the situation.

1. Safety rules

The user is responsible for the safekeeping of any changes made to the factory settings. The manufacturer accepts no liability for any deleted personal settings.

1. Safety rules

Copyright of these operating instructions remains with the manufacturer.

The text and illustrations are all technically correct at the time of printing. We reserve the right to make changes. The contents of the operating instructions shall not provide the basis for any claims whatsoever on the part of the purchaser. If you have any suggestions for improvement, or can point out any mistakes that you have found in the instructions, we will be most grateful for your comments.

With its "24 hours of sun" vision, Fronius is aiming to offer its customers solutions for generating, storing, distributing and using energy in an intelligent and cost efficient manner. The use of surplus energy for hot water preparation constitutes a simple option, with low investment costs, for storing electricity in the form of heat and using it at a time of the customer's choosing.

The Fronius Ohmpilot, which carries out precisely this task, is therefore an ideal addition to the Fronius product portfolio in the area of energy management and a further step towards "24 hours of sun".

1. General information

With its "24 hours of sun" vision, Fronius is aiming to offer its customers solutions for generating, storing, distributing and using energy in an intelligent and cost efficient manner. The use of surplus energy for hot water preparation constitutes a simple option, with low investment costs, for storing electricity in the form of heat and using it at a time of the customer's choosing.

The Fronius Ohmpilot, which carries out precisely this task, is therefore an ideal addition to the Fronius product portfolio in the area of energy management and a further step towards "24 hours of sun".

1. General information
2. General

With its "24 hours of sun" vision, Fronius is aiming to offer its customers solutions for generating, storing, distributing and using energy in an intelligent and cost efficient manner. The use of surplus energy for hot water preparation constitutes a simple option, with low investment costs, for storing electricity in the form of heat and using it at a time of the customer's choosing.

The Fronius Ohmpilot, which carries out precisely this task, is therefore an ideal addition to the Fronius product portfolio in the area of energy management and a further step towards "24 hours of sun".

1. General information
2. General

• Fronius SnapInverter or GEN24 series inverters
  • Fronius Symo / Galvo / Eco or Primo (from Fronius Datamanager 2.0 software version 3.8.1-x or higher) or Fronius Symo Hybrid (from Fronius Hybridmanager software version V1.8.1.x onwards)
  • Fronius Primo / Symo GEN24
• Fronius Smart Meter
• Fronius Ohmpilot
• Resistive load (e.g. boiler with heating element)

1. General information
2. General

A Fronius Smart Meter is required to operate the Ohmpilot so that the surplus energy can be measured. On the user interface of the inverter, it must be set whether the Fronius Smart Meter is installed at the feed-in point or in the consumption branch.

1. General information
2. General

The Ohmpilot is a separate device that can control the surplus power from the PV system in a continuously variable manner using pulse width modulation for a phase between 0 and 100% (or 0 and 3 kW). In addition, the Ohmpilot has 2 additional outputs for switching further phases. This means that heating elements with an output of 300 W to 9 kW can be controlled in a continuously variable manner.

A heating element with up to 3 kW output can be controlled in a continuously variable manner using one phase.

For a heating element with 9 kW output, the surplus power of 0 - 3 kW is controlled in a continuously variable manner in phase 1. If even more power is available, the Ohmpilot also activates phase 2 and phase 1 can again control the surplus in a continuously variable manner between 3 – 6 kW. If the available power is higher than 6 kW, the Ohmpilot also activates phase 3 and phase 1 can again control the surplus in a continuously variable manner between 6 and 9 kW.

Other resistive loads such as infrared heaters, towel dryers, etc. can also be controlled.

1. General information
2. General

1. General information
2. General

Warning notices and safety symbols are affixed to the left side of the Ohmpilot. These warning notices and safety symbols must not be removed or painted over. They warn against incorrect operation, as this may result in serious injury and damage.

Safety symbols:
	Danger of serious injury and damage due to incorrect operation
	Do not use the functions described here until you have fully read and understood the following documents: These Operating Instructions All the Operating Instructions for the system components of the photovoltaic system, especially the safety rules
	Dangerous electrical voltage
	Before opening the machine, wait for the capacitors to discharge!
	Hot surface

Text of the warning notices:

WARNING!
An electric shock can be fatal. Before opening the device, it must be disconnected at the input and output. Wait for the capacitors to discharge (15 seconds).

WARNING!
The device must not be covered and nothing may be hung over the device or the cables.

1. General information

			1x WPS 2x ACCESS POINT 3x BOOSTMODE
		Press 1x	WPS (Wi-Fi Protected Setup) opens for 2 minutes or until successful pairing with the router. Pressing the WPS button on the router sends the WLAN password to the Ohmpilot.
		Press 2x	WLAN access point is activated for 30 minutes so that settings can be implemented on the Ohmpilot via the Fronius Solar.web App.
		Press 3x	Boost Mode - dimmer level is activated for 4 hours at 100%, L2 and L3 are switched through. This may result in electricity being sourced from the grid.
		Press again	Ohmpilot is returned to standard operating mode, Boost Mode, access point or WPS are deactivated.
	Heating indicator	Dark	No power supply to the Ohmpilot.
		Green flashing	The faster the flashing frequency, the greater the heat output. At 0 W heat output, the LED flashes slowly, at full output fast.
		Green 2x flashing	It measures the output of the heating element and detects whether a 1- or 3-phase heater is connected.
		Steady green	Minimum temperature undercut or legionella prevention active (full heat output).
	LAN / WLAN connection indicator	Dark	No connection
		Blue 1x flashing	WPS (Wi-Fi Protected Setup) open
		Blue 2x flashing	WLAN Access Point open
		Steady blue	Connection to network
	Error indicator	Dark	No error
		Red 1x flashing	No connection to the inverter
		Red 2x flashing	Temperature measurement faulty
		Red 3x flashing	Heating element faulty
		Red 4x flashing	Ohmpilot faulty
		Red 5x flashing	Minimum temperature not reached
		A detailed description of the error is provided in Fronius Solar.web.

1. General information
2. Control elements and connections

			1x WPS 2x ACCESS POINT 3x BOOSTMODE
		Press 1x	WPS (Wi-Fi Protected Setup) opens for 2 minutes or until successful pairing with the router. Pressing the WPS button on the router sends the WLAN password to the Ohmpilot.
		Press 2x	WLAN access point is activated for 30 minutes so that settings can be implemented on the Ohmpilot via the Fronius Solar.web App.
		Press 3x	Boost Mode - dimmer level is activated for 4 hours at 100%, L2 and L3 are switched through. This may result in electricity being sourced from the grid.
		Press again	Ohmpilot is returned to standard operating mode, Boost Mode, access point or WPS are deactivated.
	Heating indicator	Dark	No power supply to the Ohmpilot.
		Green flashing	The faster the flashing frequency, the greater the heat output. At 0 W heat output, the LED flashes slowly, at full output fast.
		Green 2x flashing	It measures the output of the heating element and detects whether a 1- or 3-phase heater is connected.
		Steady green	Minimum temperature undercut or legionella prevention active (full heat output).
	LAN / WLAN connection indicator	Dark	No connection
		Blue 1x flashing	WPS (Wi-Fi Protected Setup) open
		Blue 2x flashing	WLAN Access Point open
		Steady blue	Connection to network
	Error indicator	Dark	No error
		Red 1x flashing	No connection to the inverter
		Red 2x flashing	Temperature measurement faulty
		Red 3x flashing	Heating element faulty
		Red 4x flashing	Ohmpilot faulty
		Red 5x flashing	Minimum temperature not reached
		A detailed description of the error is provided in Fronius Solar.web.

1. General information
2. Control elements and connections

1. General information

Controlled in a continuously variable manner from 0 to 3 kW

• 0.3 to 3 kW

• Purely resistive load (no electronic temperature limiters, fans, etc.)

1. General information
2. Selection of heater

Controlled in a continuously variable manner from 0 to 3 kW

• 0.3 to 3 kW

• Purely resistive load (no electronic temperature limiters, fans, etc.)

1. General information
2. Selection of heater

Controlled in a continuously variable manner from 0 to 9 kW.

• 0.9 to 9 kW

• Equal load distribution on all 3 phases (e.g. 3 x 3 kW).
• If a mechanical temperature switch is being used, it must switch all 3 phases simultaneously.
• Purely resistive load (no electronic temperature limiters, fans, etc.)
• Neutral conductor must be implemented (this can generally also be retrofitted)

Temperature limitation
A mechanical temperature switch simplifies commissioning and use. If a mechanical temperature switch is not available, a temperature sensor can also be connected to the Ohmpilot to limit the maximum temperature. (See chapter "Temperature limitation" on page Temperature limitation)

1. General information
2. Selection of heater

500-litre boiler, heater can be fitted at the very bottom of the boiler,
temperature spread 45 - 60 °C = 15 °C;
4.5 kW heater

Possible stored energy = 500l x 1.16 kWh x 15 °C = 8.7 kWh. If the heater is fully activated, the heating up takes approx. 2 hours (8.7 kWh / 4.5 kW)

Please note the following criteria when choosing a location for the Ohmpilot:

Install only on a solid surface.
		Max. ambient temperatures: 0 °C / +40 °C
		Relative humidity: 0 - 99%
		The airflow within the Ohmpilot is from the bottom to the top.
If the Ohmpilot is installed in an enclosed space, then forced-air ventilation must be provided to ensure adequate heat dissipation.
IMPORTANT! The maximum cable length from the output of the Ohmpilot to the load (heating element) must not exceed 5 m.

1. Installation and commissioning

Please note the following criteria when choosing a location for the Ohmpilot:

Install only on a solid surface.
		Max. ambient temperatures: 0 °C / +40 °C
		Relative humidity: 0 - 99%
		The airflow within the Ohmpilot is from the bottom to the top.
If the Ohmpilot is installed in an enclosed space, then forced-air ventilation must be provided to ensure adequate heat dissipation.
IMPORTANT! The maximum cable length from the output of the Ohmpilot to the load (heating element) must not exceed 5 m.

1. Installation and commissioning
2. Choice of location and installation position

Please note the following criteria when choosing a location for the Ohmpilot:

Install only on a solid surface.
		Max. ambient temperatures: 0 °C / +40 °C
		Relative humidity: 0 - 99%
		The airflow within the Ohmpilot is from the bottom to the top.
If the Ohmpilot is installed in an enclosed space, then forced-air ventilation must be provided to ensure adequate heat dissipation.
IMPORTANT! The maximum cable length from the output of the Ohmpilot to the load (heating element) must not exceed 5 m.

1. Installation and commissioning
2. Choice of location and installation position

		The Ohmpilot is suitable for installation indoors.
		Do not install the Ohmpilot outdoors. The housing complies with protection class IP 54 and is protected against spray water from all sides.
		In order to minimise the heating up of the Ohmpilot, do not expose it to direct insolation. Mount the Ohmpilot in a protected position. The Ohmpilot must only be mounted and operated at an ambient temperature of 0-40 °C.
		IMPORTANT! The Ohmpilot must not be installed or used at altitudes above 2000 m.
		Do not install the Ohmpilot in: Areas where ammoniac, corrosive vapours, acids or salts are present (e.g. fertiliser stores, ventilation openings from cattle sheds, chemical plants, tanneries, etc.)
		Do not install the Ohmpilot in: Places where there is an increased risk of damage from farm animals (horses, cattle, sheep, pigs, etc.) Stables or adjoining areas Storage areas for hay, straw, chaff, animal feed, fertilisers, etc.
		The Ohmpilot is designed to be dustproof. However, in areas with a heavy build-up of dust, the thermal efficiency may still be impaired by dust forming on the cooling surfaces. Regular cleaning is necessary in such situations. We therefore recommend not installing the device in areas and environments with high dust accumulation.
		Do not install the Ohmpilot in: Greenhouses Storage or processing areas for fruit, vegetables or viticulture products Areas used in the preparation of grain, green fodder or animal feeds

1. Installation and commissioning
2. Choice of location and installation position

		The Ohmpilot is designed to be installed vertically on a vertical wall.
		Do not install the Ohmpilot horizontally.
		Do not install the Ohmpilot on a sloping surface.
		Do not install the Ohmpilot on a sloping surface with its connection sockets facing upwards.
		Do not install the Ohmpilot at an angle on a vertical wall.
		Do not install the Ohmpilot horizontally on a vertical wall.
		Do not install the Ohmpilot such that it overhangs with its connection sockets facing upwards.
		Do not install the Ohmpilot such that it overhangs with its connection sockets facing upwards.
		Do not install the Ohmpilot such that it overhangs with its connection sockets facing downwards.
		Do not install the Ohmpilot on the ceiling.

1. Installation and commissioning

IMPORTANT! The IP 54 protection class only applies if the cover is firmly screwed to the back.

1. Installation and commissioning
2. Wall mounting

IMPORTANT! The IP 54 protection class only applies if the cover is firmly screwed to the back.

1. Installation and commissioning
2. Wall mounting

IMPORTANT! Different fixings may be required to fit the Ohmpilot depending on the type of surface. Fixings are therefore not included in the scope of supply. The installer is responsible for selecting the correct fixings. It must be ensured that the screws are tight and that the wall is stable.

1. Installation and commissioning
2. Wall mounting

To install the Ohmpilot, Fronius recommends the use of steel screws with a diameter of 4 - 6 mm.

1. Installation and commissioning
2. Wall mounting

1

2

3

4

1. Installation and commissioning

Stripping length of terminals on power stage set (L1, L2, etc.)

Stripping length of terminals on control board (D+, D-, - and PT1000)

1. Installation and commissioning
2. Installation

Stripping length of terminals on power stage set (L1, L2, etc.)

Stripping length of terminals on control board (D+, D-, - and PT1000)

1. Installation and commissioning
2. Installation

IMPORTANT! Electrical connection work may only be carried out by a specialist.

IMPORTANT! The ground conductor connection must be perfectly installed and reliably connected.

IMPORTANT! The Ohmpilot must be equipped with an overvoltage protection device of maximum B16 A and a residual-current circuit breaker on the grid side.

IMPORTANT! On the output side, it must be ensured that only purely resistive loads are connected.

IMPORTANT! The maximum cable length from the output of the Ohmpilot to the load (heating element) must not exceed 5 m due to electromagnetic compatibility.

IMPORTANT! The Ohmpilot must be protected against overvoltage from the grid.

IMPORTANT! When connecting a heating element, check the grounding of the boiler/buffer and the heating system. Also check the maximum permissible inlet water and hot water temperature when setting the temperature on the heating element.

IMPORTANT! The RS485 lead should be designed as a data cable in order to prevent any mix-up with the mains lead when connecting.

1. Installation and commissioning

IMPORTANT! Plug & Play - no further settings are required for this application after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot. Surplus energy is consumed using the heating element in a continuously variable manner.

If no temperature sensor is fitted, an external source (e.g. gas-fired heating) must be used to ensure the minimum temperature is met.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This may result in electricity being sourced from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

1. Installation and commissioning
2. 1-phase heating element up to 3 kW

IMPORTANT! Plug & Play - no further settings are required for this application after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot. Surplus energy is consumed using the heating element in a continuously variable manner.

If no temperature sensor is fitted, an external source (e.g. gas-fired heating) must be used to ensure the minimum temperature is met.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This may result in electricity being sourced from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

1. Installation and commissioning

IMPORTANT! Plug & Play - no further settings are required for this application after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot. This means that the surplus energy is consumed in a continuously variable manner with the heating element.
Depending on the surplus power, the individual phases are switched on or off and the remaining power is consumed at L1. As a result, the heating element output is divided by three.

If no temperature sensor is fitted, an external source (e.g. gas boiler) must be used to ensure the minimum temperature is met.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This may result in electricity being sourced from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

IMPORTANT! A heating element with a neutral conductor is required.

1. Installation and commissioning
2. 3-phase heating element 900 W up to 9 kW

IMPORTANT! Plug & Play - no further settings are required for this application after successful connection to the inverter.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot. This means that the surplus energy is consumed in a continuously variable manner with the heating element.
Depending on the surplus power, the individual phases are switched on or off and the remaining power is consumed at L1. As a result, the heating element output is divided by three.

If no temperature sensor is fitted, an external source (e.g. gas boiler) must be used to ensure the minimum temperature is met.

As an alternative, the Ohmpilot can ensure the minimum temperature. To do this, a temperature sensor must be connected so that the Ohmpilot can measure the temperature. This may result in electricity being sourced from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

IMPORTANT! A heating element with a neutral conductor is required.

1. Installation and commissioning

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot and by targeted switching on of the heat pump.

For activation, the heat pump must have a control input (e.g. SG Ready or grid operator release). For example, the heat pump can be switched from operating state 2 (normal operation) to operating state 3 (increased operation) as a result of activation of heat pump input 2 by the relay. The heat pump can also be switched from operating state 1 (blocked time set by grid operator) to operating state 2 (normal operation) as a result of activation of heat pump input 1 by the relay.

A description and list of SG Ready heat pumps can be found at: http://www.waermepumpe.de/normen-technik/sg-ready/sg-ready-datenbank/

Relatively small surpluses are consumed by the heating element in a continuously variable manner. From a certain excess power, it makes sense to activate the heat pump, as it has a higher efficiency. The average COP (coefficient of performance) for water heating up to 53 °C is 2.5. Thus, with 1 KW of electrical energy, 2.5 KW of thermal energy can be generated.

The optimal switching thresholds depend on:

• Heat pump COP. The higher the temperature to which the hot water is heated, the lower the COP.
• The electrical heat pump output.
• The feed-in tariff and the costs for purchasing energy.
• Reduction of the heat pump's start-up cycles = increase in service life of the heat pump.
• Thermal losses from the heat pump and the pipes.

If no temperature sensor is fitted, the heat pump must be used to ensure the minimum temperature is met. As an alternative, the Ohmpilot can also ensure the minimum temperature by activating the heat pump. This may result in electricity being sourced from the grid. The maximum temperature must be set on the heating element thermostat and on the heat pump. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

This function can also be combined with a 3-phase heating element.

1. Installation and commissioning
2. 1-phase heating element up to 3 kW with heat pump control

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot and by targeted switching on of the heat pump.

For activation, the heat pump must have a control input (e.g. SG Ready or grid operator release). For example, the heat pump can be switched from operating state 2 (normal operation) to operating state 3 (increased operation) as a result of activation of heat pump input 2 by the relay. The heat pump can also be switched from operating state 1 (blocked time set by grid operator) to operating state 2 (normal operation) as a result of activation of heat pump input 1 by the relay.

A description and list of SG Ready heat pumps can be found at: http://www.waermepumpe.de/normen-technik/sg-ready/sg-ready-datenbank/

Relatively small surpluses are consumed by the heating element in a continuously variable manner. From a certain excess power, it makes sense to activate the heat pump, as it has a higher efficiency. The average COP (coefficient of performance) for water heating up to 53 °C is 2.5. Thus, with 1 KW of electrical energy, 2.5 KW of thermal energy can be generated.

The optimal switching thresholds depend on:

• Heat pump COP. The higher the temperature to which the hot water is heated, the lower the COP.
• The electrical heat pump output.
• The feed-in tariff and the costs for purchasing energy.
• Reduction of the heat pump's start-up cycles = increase in service life of the heat pump.
• Thermal losses from the heat pump and the pipes.

If no temperature sensor is fitted, the heat pump must be used to ensure the minimum temperature is met. As an alternative, the Ohmpilot can also ensure the minimum temperature by activating the heat pump. This may result in electricity being sourced from the grid. The maximum temperature must be set on the heating element thermostat and on the heat pump. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

This function can also be combined with a 3-phase heating element.

1. Installation and commissioning
2. 1-phase heating element up to 3 kW with heat pump control

General settings, symbolic representation

Example 1: If "Consume" has been selected under the switch-off threshold and a power of 500 W has been entered, the heat pump will be switched off as soon as the power being drawn from the grid exceeds 500 W.

Example 2: If "Feed-in" has been selected under the switch-off threshold and a power of 500 W has been entered, the heat pump will be switched off as soon as the power being fed in is less than 500 W.

1. Installation and commissioning

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot. Surplus energy is consumed using the heating element in a continuously variable manner.

The temperature is measured by the Ohmpilot. If the temperature falls below the minimum, then an external source (e.g. gas boiler) will be activated until the minimum temperature is reached again, so that the Ohmpilot only uses surplus energy and does not draw any energy from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

The heating element is used for the legionella prevention program.

This function can also be combined with a 3-phase heating element.

1. Installation and commissioning
2. 1-phase heating element up to 3 kW and external source

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot. Surplus energy is consumed using the heating element in a continuously variable manner.

The temperature is measured by the Ohmpilot. If the temperature falls below the minimum, then an external source (e.g. gas boiler) will be activated until the minimum temperature is reached again, so that the Ohmpilot only uses surplus energy and does not draw any energy from the grid.

The maximum temperature must be set on the heating element thermostat. If the heating element does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)).

The heating element is used for the legionella prevention program.

This function can also be combined with a 3-phase heating element.

1. Installation and commissioning
2. 1-phase heating element up to 3 kW and external source

General settings, symbolic representation

1. Installation and commissioning

Many heating systems consist of a boiler and a buffer, whereby the central heating supplies the buffer, and a control system feeds the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot is also capable of heating the hot water boiler first and then the buffer, so that the maximum amount of photovoltaic surplus energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot.

For this application, two heating elements are installed, with preference being given to activation of the first heating element (9). Only once the maximum temperature in the boiler (6) has been reached is the second heating element activated in a continuously variable manner, so that the remaining energy can, for example, be stored in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the device switches back to the first heating element as soon as a temperature difference of 8°C is reached (compared to the temperature measured prior to switch-over).

This switching can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. By using layering in a storage tank, it is also possible to store significantly more energy, as a minimum temperature is normally maintained in the top part of the boiler. This means that the temperature difference and thus the amount of energy is rather small. In the lower part of the boiler, a high temperature difference of, for example, 50 °C can be used.

Both the first and the second heating element can be 1-phase or 3-phase. For two 3-phase heating elements, see Application example 6. If no temperature sensor is fitted, an external source (e.g. gas boiler) must be used to ensure the minimum temperature is met.

Alternatively, the Ohmpilot can also ensure the minimum temperature. This may result in electricity being sourced from the grid. The maximum temperature must be set on the heating element thermostat. If heating element 1 (9) does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)). However, heating element 2 (11) must have a thermostat.

1. Installation and commissioning
2. Two heating elements - 3-phase and 1-phase

Many heating systems consist of a boiler and a buffer, whereby the central heating supplies the buffer, and a control system feeds the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot is also capable of heating the hot water boiler first and then the buffer, so that the maximum amount of photovoltaic surplus energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot.

For this application, two heating elements are installed, with preference being given to activation of the first heating element (9). Only once the maximum temperature in the boiler (6) has been reached is the second heating element activated in a continuously variable manner, so that the remaining energy can, for example, be stored in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the device switches back to the first heating element as soon as a temperature difference of 8°C is reached (compared to the temperature measured prior to switch-over).

This switching can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. By using layering in a storage tank, it is also possible to store significantly more energy, as a minimum temperature is normally maintained in the top part of the boiler. This means that the temperature difference and thus the amount of energy is rather small. In the lower part of the boiler, a high temperature difference of, for example, 50 °C can be used.

Both the first and the second heating element can be 1-phase or 3-phase. For two 3-phase heating elements, see Application example 6. If no temperature sensor is fitted, an external source (e.g. gas boiler) must be used to ensure the minimum temperature is met.

Alternatively, the Ohmpilot can also ensure the minimum temperature. This may result in electricity being sourced from the grid. The maximum temperature must be set on the heating element thermostat. If heating element 1 (9) does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)). However, heating element 2 (11) must have a thermostat.

1. Installation and commissioning
2. Two heating elements - 3-phase and 1-phase

General settings, symbolic representation

1. Installation and commissioning

Many heating systems consist of a boiler and a buffer, whereby the central heating supplies the buffer, and a control system feeds the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot is also capable of heating the hot water boiler first and then the buffer, so that the maximum amount of photovoltaic surplus energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot.

For this application, two heating elements are installed, with preference being given to activation of the first heating element (10). Only once the maximum temperature in the boiler (7) has been reached is the second heating element (12) activated in a continuously variable manner, so that the remaining energy can, for example, be stored in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the device switches back to the first heating element as soon as a temperature difference of 8 °C is reached (compared to the temperature measured prior to switch-over).

This switching can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. By using layering in a storage tank, it is also possible to store significantly more energy, as a minimum temperature is normally maintained in the top part of the boiler. This means that the temperature difference and therefore the amount of energy is rather small. In the lower part of the boiler, a high temperature difference of, for example, 50 °C can be used.

The switching must be realised by an external contactor. If no temperature sensor is fitted, an external source (e.g. gas-fired heating) must be used to ensure the minimum temperature is met.

Alternatively, the Ohmpilot can also ensure the minimum temperature. This may result in electricity being sourced from the grid.

The maximum temperature must be set on the heating element thermostat. If heating element 1 (10) does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)). However, heating element 2 (12) must have a thermostat.

1. Installation and commissioning
2. Two 3-phase heating elements up to 9 kW

Many heating systems consist of a boiler and a buffer, whereby the central heating supplies the buffer, and a control system feeds the hot water boiler via a pump. As with thermal photovoltaic systems, the Ohmpilot is also capable of heating the hot water boiler first and then the buffer, so that the maximum amount of photovoltaic surplus energy can be stored.

The Fronius Smart Meter records the current power at the feed-in point and transfers the data to the inverter. By controlling the Ohmpilot, the inverter adjusts any surplus energy that is available to zero. In detail, this takes place by continuously adjusting the heating element connected to the Ohmpilot.

For this application, two heating elements are installed, with preference being given to activation of the first heating element (10). Only once the maximum temperature in the boiler (7) has been reached is the second heating element (12) activated in a continuously variable manner, so that the remaining energy can, for example, be stored in a buffer.

If no temperature sensor is connected to the Ohmpilot, after 30 minutes the Ohmpilot attempts to output energy via the first heating element once again. If a temperature sensor is present, the device switches back to the first heating element as soon as a temperature difference of 8 °C is reached (compared to the temperature measured prior to switch-over).

This switching can also be used for layering in a boiler/buffer, so that the maximum temperature is reached in the top part of the boiler using minimal energy and the remaining energy is stored in the lower part of the boiler. By using layering in a storage tank, it is also possible to store significantly more energy, as a minimum temperature is normally maintained in the top part of the boiler. This means that the temperature difference and therefore the amount of energy is rather small. In the lower part of the boiler, a high temperature difference of, for example, 50 °C can be used.

The switching must be realised by an external contactor. If no temperature sensor is fitted, an external source (e.g. gas-fired heating) must be used to ensure the minimum temperature is met.

Alternatively, the Ohmpilot can also ensure the minimum temperature. This may result in electricity being sourced from the grid.

The maximum temperature must be set on the heating element thermostat. If heating element 1 (10) does not have a thermostat, the Ohmpilot can also carry out this task as an alternative (see chapter Optional settings on page (→)). However, heating element 2 (12) must have a thermostat.

1. Installation and commissioning
2. Two 3-phase heating elements up to 9 kW

General settings, symbolic representation

1. Installation and commissioning

Via the floating contact of the device control, the Ohmpilot can also control a circulating pump in a heating system in parallel to a heating element. This is possible with all circulating pumps that have an auxiliary relay.

The designation of the floating contact on the Ohmpilot is NC W NO. The switching rocker (W) switches from the "normally open" (NO) position to "normally closed" (NC) when activated.

In heating mode, this contact is activated and the circulating pump runs as "Heater 2" in parallel to the heating element, which is operated via the "Heater 1" output.

To prevent the auxiliary relay of the circulating pump from switching on and off continuously in case of low or fluctuating PV power, the Ohmpilot is equipped with a delay. This has a positive effect on the wear and service life of the relay and the pump.

1. Installation and commissioning
2. 1-phase heating element up to 3 KW and circulating pump

Via the floating contact of the device control, the Ohmpilot can also control a circulating pump in a heating system in parallel to a heating element. This is possible with all circulating pumps that have an auxiliary relay.

The designation of the floating contact on the Ohmpilot is NC W NO. The switching rocker (W) switches from the "normally open" (NO) position to "normally closed" (NC) when activated.

In heating mode, this contact is activated and the circulating pump runs as "Heater 2" in parallel to the heating element, which is operated via the "Heater 1" output.

To prevent the auxiliary relay of the circulating pump from switching on and off continuously in case of low or fluctuating PV power, the Ohmpilot is equipped with a delay. This has a positive effect on the wear and service life of the relay and the pump.

1. Installation and commissioning
2. 1-phase heating element up to 3 KW and circulating pump

General settings, symbolic representation

1. Installation and commissioning

The data connection is required for communication between the inverter and the Ohmpilot. The inverter mainly sends default values to the Ohmpilot. For some applications, it is necessary to make settings via the Ohmpilot user interface.

There are 3 possible communication channels:

• Modbus RTU (via RS 485)
• LAN (Ethernet)
• WLAN

1. Installation and commissioning
2. Establishing the data connection

The data connection is required for communication between the inverter and the Ohmpilot. The inverter mainly sends default values to the Ohmpilot. For some applications, it is necessary to make settings via the Ohmpilot user interface.

There are 3 possible communication channels:

• Modbus RTU (via RS 485)
• LAN (Ethernet)
• WLAN

1. Installation and commissioning
2. Establishing the data connection

Each inverter with a Fronius Smart Meter automatically connects itself to the Ohmpilot. However, if there is more than one inverter with a Fronius Smart Meter in the network, the wrong inverter can be connected. In this case, the Ohmpilot can be manually connected under System Information on the user interface of the inverter to be connected.

Information on how to access the user interface of the inverter can be found in the "Fronius Datamanager 2.0" Operating Instructions.

1. Installation and commissioning
2. Establishing the data connection

(A) DIP switches

DIP 1-3 = Modbus address BCD
DIP 4 = reserve
DIP 5 = terminating resistor (120 Ohm)

NOTE!

Avoid confusion of cables.

Use a data cable that is clearly distinguishable from the mains cable, so that there is no confusion, and injury and damage to property are avoided.

NOTE!

Faulty cabling.

This is indicated by the red LED indicator flashing 1x.

1. Installation and commissioning
2. Establishing the data connection

As standard, the Ohmpilot obtains its IP address automatically from the DHCP server, meaning that no settings are generally necessary.

The inverter automatically searches for the Ohmpilot, and the search process may take up to 5 minutes. If the red LED is not lit and the green LED is flashing, the Ohmpilot is working correctly.

A static IP address can be assigned to the Ohmpilot via the user interface.

Set Up Network, symbolic representation

To set the IP address manually, the "Static" option must be selected. Then enter the desired IP address.

The Ohmpilot can then be reached at http://ohmpilotL.local or at the fixed IP address assigned.

1. Installation and commissioning
2. Establishing the data connection

There are two options for connecting the Ohmpilot to an existing WLAN network:

Set Up Navigation, symbolic representation

A static IP address can be assigned to the Ohmpilot via the user interface.

The Ohmpilot can then be reached at http://ohmpilotW.local or at the fixed IP address assigned. Alternatively, the Ohmpilot can also be searched on the network using the Fronius Solar.web App.

1. Installation and commissioning

Boost Mode is used to supply the load at the "Heater 1" output with 100% of the available power for a short time. Over a maximum period of 4 hours, the dimmer level is activated at 100%, L2 and L3 are switched through. This may result in electricity being sourced from the grid.

Boost Mode can be activated and deactivated by pressing the button on the Ohmpilot (see Indicators/controls on the device ) or via the user interface.

1. Installation and commissioning
2. Boost Mode

Boost Mode is used to supply the load at the "Heater 1" output with 100% of the available power for a short time. Over a maximum period of 4 hours, the dimmer level is activated at 100%, L2 and L3 are switched through. This may result in electricity being sourced from the grid.

Boost Mode can be activated and deactivated by pressing the button on the Ohmpilot (see Indicators/controls on the device ) or via the user interface.

1. Installation and commissioning
2. Boost Mode

Boost Mode, symbolic representation

1. Ohmpilot user interface

Status indicators, symbolic representation

1. Ohmpilot user interface
2. User interface

Status indicators, symbolic representation

1. Ohmpilot user interface

General settings, symbolic representation

1. Ohmpilot user interface
2. Optional settings

General settings, symbolic representation

1. Ohmpilot user interface
2. Optional settings

When the legionella prevention function is activated, the hot water is heated to 60 °C at a set interval.

Despite the setting of the "Legionella prevention" function, contamination of water with legionella is not completely ruled out.

1. Ohmpilot user interface
2. Optional settings

This function ensures that the user-specified temperature is not undershot. If there is not sufficient surplus power available, the external source will be started up, if activated, or otherwise electricity will be drawn from the grid in order to ensure a minimum temperature.

Up to four time periods can be defined so that, for example, higher hot water temperatures are only certain to be available at night, but more potential is possible for the surplus during the day due to the fact that a lower target temperature is selected.

Example 1: 03:00 - 05:00 45 °C => So that in the morning at 06:00 there is hot water available for showering. After showering, the water should only be heated using surplus energy. 16:00 - 18:00 45 °C => If there was not enough surplus energy available, the water is reheated for showering. After showering, reheating should no longer be carried out in order to keep heat losses to a minimum.

1. Ohmpilot user interface
2. Optional settings

If heater 1 does not have a configurable thermostat, this function can be used to limit the temperature.

• Errors are saved in the Datamanager 2.0 and can be sent via Fronius Solar.web.
• Possible error outputs (as at 07/12/2015):

1. Appendix

• Errors are saved in the Datamanager 2.0 and can be sent via Fronius Solar.web.
• Possible error outputs (as at 07/12/2015):

1. Appendix
2. Status Codes

• Errors are saved in the Datamanager 2.0 and can be sent via Fronius Solar.web.
• Possible error outputs (as at 07/12/2015):

1. Appendix

1. Appendix
2. Technical data

1. Appendix
2. Technical data

1. Appendix
2. Technical data

1. Appendix
2. Technical data

1. Appendix

Tests/information according to EN60730 Section 1 Table 7.2

1. Appendix
2. Tests/specifications

Tests/information according to EN60730 Section 1 Table 7.2

1. Appendix

Detailed, country-specific warranty conditions are available on the internet
www.fronius.com/solar/garantie

1. Appendix
2. Warranty terms and conditions, and disposal

Detailed, country-specific warranty conditions are available on the internet
www.fronius.com/solar/garantie

1. Appendix
2. Warranty terms and conditions, and disposal

The manufacturer, Fronius International GmbH, will take back the old device and arrange for it to be recycled in an appropriate manner. Observe the national regulations for the disposal of electronic equipment.

1. Appendix
2. Warranty terms and conditions, and disposal

CE mark
The devices conform to all the requisite and relevant standards and guidelines that form part of the relevant EU directive, and are therefore permitted to display the CE mark.