If you can separate a few solar panels with a 12 volt battery, you can have a very efficient solar circuit, for something like lighting. Avoid batteries in parallel. I like Crown CR-220 golf cart batteries in series for the most bang for the buck. A solar trick is point half your panels largely east and one half largely west. You lose total watts but your charge duration will increase. = worth it.
get yourself a heatpump water heater, and replace the electric element with a small resistor and you can have full size tank that heats on about 400 watts. I can give you more info if you'd like it.