A battery operated standby power system, including a microboard; at least two rechargeable batteries mounted to the microboard; a charger for selectively charging the at least two batteries; at least two, or dual, inverters, one inverter being assigned to each of the at least two batteries; a plurality of outlets, the outlets being configured to selectively deliver 120 VAC, 240 VAC and both 120 and 240 VAC from the batteries through the inverters.