Solar panels....I have a 200 watts setup on my roof and can charge my 36 V 14.5 amp battery in 5 hrs. It works but it costs. The total setup cost with panels, 2 x 6 Volt deep cycle batteries, 20 Amp controller, 1000 watt inverter, monitor and associated hardwire (wiring, plugs, connectors, mounting roof hardware etc.) came in about $1000 Can. But I get 60 kms distance per charge and can charge all my phones, and other devices. Worth the piece of mind if there were ever a power failure.