well electric power is a good option i think is the understanding here with some kind of way to generate its own power, nobody has mentioned solar panels or wind generaters to charge the batterys. also regenerative power during braking and coasting down hill are also good forms of charging so called batteries. you could also run an altenator off the system for more duration but would sacrifice power. well where on the subject of regenative power how come nobody has came out with a turbine system for the exhaust of new vehicles to run their accesories instead od muffling to get the back pressure the engine needs. just food for thought. MO
