Solar IS the way to go!
If you order a pre-wire on a new A/S, be sure that the factory uses 10 gauge wire thru the walls for your panel connection to the controller. Avoiding voltage drop is CRITICAL in a quality solar install.
At AM Solar, we use 10 gauge ship cable (it has a round jacket that fits properly in the water-tight connectors) to join all of the roof panels to the combiner box, then run 8 gauge marine cable from the box to the charge controller.
It may cost a bit more, but this wiring will super-charge your solar applications!!!!
BTW, I just added 2 more 100 watt AM Solar panels to the roof of my Sprinter. I now have 400 watts of panels charging 2 Lifeline GPL-6CT 300 amp-hour golf cart batteries that run a Magnum 2000 watt sine wave inverter. Next mod is adding another 2 GPL-6CT batteries for a total of 600 amp-hours of DC power.
If the 220 amp-hour Lifelines run down in the CCD, I just plug into the inverter and use the van like a 2000 watt generator......much quieter!!!
