... -consumption: 6 DescriptionOnly For off-Grid PV Solar System. For 10A 12V Pv System: 120W Solar Panel,12V Lead-acid Battery,21V for Max input ... Voltage For 10A 24V Pv System: 240W Solar Panel,24V Lead-acid Battery,42V for Max input Voltage ... before the controller start to work 2013 new design 24V Solar Panel battery charge controller 10 amp 12V Solar PV system indoor use