3-function DC-to-AC inverter with auto AC-to-battery transfer and integrated charging system serves as an extended run standalone power source or a household or industrial inverter. This Inverter is designed by using Micro-controller which controls the charging as well as generates PWM at Inverter mode. Supplies up to 250 watts of continuous 220V AC power to one AC outlet from any 12V battery or 12V automotive DC source. When AC cable is connected to a live wall socket, commercial power passes through to connected equipment and the battery is recharged via 3 stage, 5 amp charging system. Reliable large transformer design with efficient PWM output and frequency control powers resistive, Resistive and capacitive loads. The inverter responds to blackouts as well as brownouts at low and high voltage and comes on the inverter/battery mode automatically. The length of time the inverter operates depends on the amp-hour capacity of the battery bank.