1. Photovoltaic modules. They convert the sun energy in DC electricity. Depends on the chosen power, usually they are from 4 to 6 photovoltaic modules in series with 250 W power each.
2. ThermoSol K2. ThermoSol is bulgarian controller for DC power supply for heating element ( boiler ). ThermoSol controls the temperature and the time for heating the water.
3. Boiler. The ThermoSol controller is connected to the boiler direct to the electrical heating element. 1 kW or 4 x 250 W photovoltaic modules are most effective with 3 – 3,5 kW heater.
4. 220V Grid. The grid is needed for supply of the ThermoSol controller.