Built-in generator, power supply in case of power failure. Long-term use of the car requires excess fuel and wear and tear. Used (rarely used) 6 hp roto milling machine. to power a new $50, 12V - 65A, single wire alternator. Installed a 1200w pure sine wave inverter and 100Ah deep cycle battery in a boat battery box on a cheap moving truck (plus a 175Amp breaker and isolator). Bought a cheap 20ft jumper cable. Leave the tiller on the porch and the battery inverter in the house, connect it with cheap jumpers. Turn on the power! yeah ha. derp derp derp.