Xantrex Technology Inc, PH1800-GFP Powerhub 1800 Modified sine wave inverter/charger with battery box The battery box stores up to 200 amp-hours of battery power (single battery box included; batteries purchased separately) A second battery may be connected to double the battery capacity (additional battery box and batteries sold separately) Designed to include a generator as part of the system; generator power can pass through the unit to the AC outlets, and recharge the batteries Integrated transfer switch