Our local Snap-On tool dealer has a trailer he uses to sell toolboxes. The trailer originally had no 110v power so he would have to carry around a generator in the back of his truck to power the roof A/C and his electronics. We installed a massive 2400w array of solar panels, a Vanner 3600w Pure Sine Wave inverter charger and an insane 24v 500Ah battery bank. He can now run the roof A/C all day on battery and solar power with plenty of power left over to run his laptop, printer, credit card reader and whatever else he needs.