A system of charging and utilizing rechargeable battery packs. A vehicle is provided that has an internal vehicle battery rack with removable battery packs. The vehicle recharges the battery packs when in operation. An auxiliary battery rack is provided that is separate from the vehicle. The auxiliary battery rack can also receive the rechargeable battery packs. A power inverter converts direct current from the rechargeable battery packs to alternating current. To utilize the system, the battery packs are charged by the vehicle. Once charged, at least one of the rechargeable battery packs is moved to the auxiliary battery rack. Once engaged with the auxiliary battery rack, the power inverter converts power from the rechargeable battery packs into alternating current. The alternating current is then used to power circuits in a building or to provide a mobile AC power source that can be used in place of a mobile generator.