Originally posted by Zac
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To run more than the most modest AC system (like a small room air conditioner) would require a large solar system. Running it off grid would require very large batteries. For example, my 3 ton air conditioner eats about 5 kw when the compressor is running. Running a sustained 5 kw load would require around 100 kwh (such as 48V @ 2000 Ah) of batteries if they are to last 10+ years.
I put up trellis mounted on 4 x 4's along the western face of the 70 foot mobile home I live in, and grow hops and maypops on the trellis. The vines shade the trailer in the summer and die back in the winter so the sun can hit it (I mounted the trellis panels on hooks so I can take them down in the winter). There's about a ten degree differential between the temperature on the sun side and on the shade side, and that really makes a difference in the amount of a/c we use. Given my druthers, I'd turn the a/c off, open the windows and install a solar-powered ventilation fan in the roof, but it's not my property.
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