Inverter Charger System can convert DC Power (from Battery) to Ac power for supporting home and office appliances or equipment when encountering utility power failure. The system transfers between two modes “Utility Mode” and “Inverter Mode”. When encountering power failure, the system will automatically transfer from “Utility Mode” to “Inverter Mode” for acquiring power from the battery. When the utility power is back on, the system will switch back to “Utility Mode”; also the built-in charger system will start to charge the battery modules. This system is designed for a Home or Office environment where there is a constant shortage and long term interruption in Power Supply.