... refrigerator, etc.Socket type: Model MKM-800W Input DC voltage 12V / 24V / 48V Voltage Range DC11-15V / 21-30V / 41-56V ... Test: Outlook, Input voltage, Output voltage, Frequency, Socket type, Protection functions(Low battery voltage, over battery voltage, lack-voltage alarm. Protections:short circuit ... contact me on by email, i will do my best to help you. 800w dc to ac power inverter, modified ...