... efficiency and high tech 3.CE, RoHS 4.solar energy system Features1. High efficiency up to 92 for grid tie ... connection.3. Inverter input voltage range: DC22~60V4. This system don't use solar charge controller. low cost.5. CE ... our QC department. Functioning Test: Outlook, Input voltage, Output voltage, Frequency, Protection functions(short circuit, overload, over temperature, low battery,.) and ...