Excess Energy Mode

The connection cable allows you to supply the photovoltaic water heater by an external electrical power source. The water heater can therefore be connected to

  • a car (starter) battery,
  • a stationary 12/24-Volt battery or to
  • the excess output of a battery management system (max. 24 V).
fothermo power supply unit

battery connection cable

Simple, fast and effective! Connected in less than 10 seconds. 

Reheat with 230 volt power supply. Just plug in the power supply unit and the intelligent reheating is activated. 
As soon as the water temperature falls below a self-defined limit and the power of the PV module is low, the water will be reheated.