... transformer inverter,high quality battery. 1KW/2KW Solar Hybrid pure sine wave Inverters with charger, UPS & BatteriesThere are some problem ... Completely controlled by CPU.3.Inverter use copper transformer, pure sine wave output.4.Two LCD displays, clearly to know ... at night, battery over charger/over discharge, output short-circuit, against overload, against over-voltage, over-current protection , ...