I am looking at solar for my trailer, the 2 panels I am looking at are
62x32 190 watt panel and
65x39 255 watt panel. Both are under a buck a watt.
For smaller -30 amp output or less- which is between 400 and 450 watts
A Kid charge controller. For bigger systems
A Classic Lite 150 charge controller. up to 96 amp output, max about 1.4kw.
Current prices on the panels are $190 and $241, the controllers are $280 and $499. Both controllers can be paralleled (with another of the same) for more output. So if you start with the kit, and exceed 30 amps you can add another one off the same array and run up to 800-900 watts, or two of the classics and run out of roof space.
I am going to start with 2 of the 255's and a classic. Other then the electric water heater, space heaters, and ac's that should cover my electric loads.
Found a (maybe) good starter solar setup,
HERE $140 for a 160 watt panel and charge controller - 88 bucks in shipping isn't THAT bad. Still under $230.