Next to the entrance of the solar heating room on the wall you can find a small amorphous PV module.

The module is responsible to produce electricity for a small electric motor, which is used to circulate air from a solar collector to the solar heating room.

The PV cells are connected to this motor directly, so it works just when the sun is strong enough to operate the amorphous silicon solar cell.

This system can be really useful for summer houses which are used only a few months during the year.