... controller: BY30A / 12V a charge-off protection, AC / DC, a manual switch. Voltage below protection, under-voltage alarm, ... , the switch does not work.4.12V 800W inverter DC inverter ( DC 24V inverter 800W )5.Rated working current:30A ,OPTIONAL6.controller ... 300W<300W<450W<600W<600WBatteryoptionalLCD display screendisplay AC DC output voltage /DC load state/battery capacityAccessories12V/24V LCD light* ...