... to various machines with different voltages(such as AC 220V, dc 12V, 9V,6V).instructionput the red switch to ON before ... , it indicates under voltagewhen the LED light green, it indicates DC 12 V output normally.specificationthe charging current scope(5A-10A ... for the overload:16.5Vinput voltage:10.5V-15V portable solar PV monocrystalline cell panel power system 50W