... Solar Inverter( If output power need to be converted into AC power 220V or 110V , the Inverter is necessary ... power into electricity power,or transfer the electricity power into battery to save,or impulse the load working. ... . In some small system, Its function is to save electricity power which war produced by the ... you need ?5. If it is rainny or cloudy day, how long backup time do you need?6. What' ...