Un-Limited batteries backup time 24 hours operation on the inverter Parameter Pre-settable Support solar panel High efficiency design to save electricity Low heat dissipation in long time operation DC start and automatic self-diagnostic function Multi-stage charger supports batteries up to 600AH Low DC Voltage supports Office and Home appliances Designed to operate under harsh environment Optional Multiple interfaces cards available Compatible with both linear & non-linear load Controllable & Removable panel with LCD.