• 1. Choose a suitable place

    Select a place for installation close to the electric boiler and 230V socket. The photovoltaic inverter heats up slightly during operation, so keep a minimum distance from surrounding objects and the ceiling to ensure the best air circulation.

  • 2. Drill holes

    Remove the wall bracket from the back of the device and attach it to the selected location. Mark the position of the holes with a pencil. Then drill two holes for 8mm dowels.

  • 3. Připevnění zařízení

    Insert the dowels into the drilled holes, then attach the bracket and fasten it to the wall with 6x60mm screws. Then attach the device to the bracket with two M4 side screws.

Connectors and controls

Description of connectors

1. Input + from PV panels
2. Input - from PV panels
3. Input 230VAC from mains
4. AC output to the resistance heater
5. Input for water temperature sensor in the boiler (storage tank)


The device uses your current electric boiler to heat hot water, which is currently connected directly to the 230V mains.

Simplified water heating connection with photovoltaic inverter.

Recommended component placement

Water temperature monitoring


The device monitors the correct water temperature in the boiler according to your settings. It is possible to use the pure solar mode or the 230V backup mode in case the water in the boiler is not heated enough.

Solar mode

In solar mode, the grid backup enable parameter is set to NO and therefore all temperatures and times related to the backup are ignored. The water will only be heated during the day and up to the temperature according to the parameter named "Photovoltaic" (or until interrupted by the boiler thermostat).

Description of individual temperature points:
1. After sunrise, the temperature in the boiler starts to rise
2. When the water temperature reaches the desired value, the heating is stopped
3. If the water temperature drops to any low value during the night, it will not be heated until the next day

Backup mode

In backup mode, the backup enable parameter is set to YES, and in this case the device will start following the backup temperatures, start time and backup duration. There are two backup temperatures. The upper temperature (Backup Off) sets the temperature at which the heating is turned off in the event of a backup. The lower temperature (Backup on) sets the temperature below which the backup is activated when the water temperature drops. At the same time, the start time and duration specify the interval when the backup will be active. Outside of this interval, the backup will not turn on even if the water temperature falls below the lower temperature.

Description of individual temperature points:
1. At night the water temperature drops but does not reach the lower temperature
2. During the day the temperature starts to rise by heating with photovoltaics
3. If the temperature for photovoltaics is reached, heating is interrupted
4. After a large draw of hot water, the temperature drops significantly and since it dropped below the lower limit and it was within the active backup interval, the backup is activated and the water starts to be heated from 230V
5. The water temperature has reached the upper temperature for the backup and the 230V mains heating is switched off

Mobile app

Monitor variables:
Instantaneous values of panel voltage, current and power | Boiler / storage tank water temperature | Device temperature | Daily energy produced | Total energy produced | Graph of power and water temperature with annual history | Current mode of operation (grid, solar, off)

Set variables:
Limit maximum power | Set desired water temperature from PV | Set water temperatures for backup | Set time for switching heating to backup | Set duration of backup | Switch inverter on/offAutomationCreate automatic actions based on the values | of individual variables and control other devices in the home (sockets, bulbs, etc.

Share the device with another user | Remote firmware update | Possibility to upgrade the inverter firmware remotely via the Internet