Autonomous photovoltaic with 3 Sharp 440W, 3000VA inverter, 4 batteries Unibat AGM VRLA 12V 200Ah (240Ah C100) with 1,200 charge-discharge cycles for 50% discharge depth for a summer cottage (with washing machine, iron, hair dryer) can:refrigerator 24 hours a dayled lighting for as long as neededrad..