Features: 1) Working voltage: 12V, 24V2) Rated current: 8A, 16A, 20A, 30A, 40A, 50A, 80A, 100A3) Acts as a solar charger when connect with a solar panel4) According to the voltage of battery, controller will adjust the charging current and decide if to supply power to the loads5) Generally keeps battery on full voltage6) Prevents battery from over-charging7) Prevents battery from over-discharging8) Prevents battery from supplying power to solar panels during darkness producing area:China