... Max efficiency to 90%7. Topology: Microprocessor8. Low battery voltage, over battery voltage, lack-voltage alarm. Protections:short circuit, overload ... . Functioning Test: Outlook, Input voltage, Output voltage, Frequency, Socket type, Protection functions(Low battery voltage, over battery voltage, lack-voltage alarm. ... you. 500 watt 12 volt DC to 220 volt AC inverter, Power Inverter, Inverter