WindyNation 100 Watt 100W Monocrystalline Photovoltaic PV Solar Panel Module 12V Battery Charging for Boat, RV, Off-Grid Designed for RVs, cabins, homes, boats, back-up and remote power use Perfect kit for 12 volt battery charging this panel will provide on average 300 Watt Hours (Wh) or 25 Amp hours of charge per day (depends on sunlight availability).