... to operate THE SYSTEM INCLUDES:1) PV module2) Control & inverter box, DC24V 48V/AC220V, 1kw~2kw, pure sine wave:3) lead-acid or ... gel battery4) Leakage protector, lightning arrester (optional)5) High quality cables for connectionSystem Features:1, ... load or rectifier load±3%)Output frequency50Hz±0.1%DistortionNo-load <1% of full load <3%Rated output power500WAllowable ...