VIGI Solar System Controller-Without Solar Panel Spec：Up to 3 × 31.2Ah/3*12VDC Output Battery, More than 500 cycles; Charging Condition: -20℃~45℃(With intelligent auxiliary heat); Discharging Condition: -30℃~60℃ (With intelligent auxiliary heat); 1*10/100Mbps RJ45 Function: Load Control\Battery Overtemperature Protection\Battery level display\Generation power display\Load power display\Generation power and Load power Statistics.