Go Power! 20-Watt Solar Charger is a high efficiency polycrystalline panel takes the suns rays and creates DC power to charge the batteries. It provides 1.2 Amp of charge per hour. This charger has a 4.5 Amps solar regulator in the kit as well as all mounting hardware and wiring. It is great for keeping the batteries topped up in the RV, boat or automobile during storage as well as includes all instructions.