The EFOY COMFORT 210 charges the onboard battery automatically. The integrated charge controller permanently monitors the charge level of the 12v battery. If necessary the EFOY COMFORT is automatically started and switched off again once the battery is charged. With an inverter you can also use 230v devices. Over the period of one year EFOY COMFORT provides 3 to 10 times as much electricity as a solar system with the same power rating.