SPT Series inverter design for American market, suit for home applicance, office equipment, solar power system, and other equipments. FEATURES Pure sine wave output, available for sensitive load. Accept generator's energy output. Suit for American 2P3W system, 120/240V. 3-step progressive charging logic, support various battery type in market. Automatically transfer between battery and AC line modes. Provide bypass without battery connected. Optional remote control function.