Granola Funk Theatre folks used a solar panel, an inverter, and a battery. They also used a meter, and lights, of course. They wheeled in this system about 2 miles, and it worked very reliably, giving enough light for night performances. Solar power is here, and it works.
|From Rainbow Family Gathering of Living Light 2008 Wyoming - Scott MacLeod|
All of the equipment is easy to get, and relatively inexpensive.
Here's "How to Make a Solar Power Generator" ~ rain.org/~philfear/how2solar.html
Solar energy can't easily heat a warm pool to 98 degrees Farhenheit to soak in, yet, in northern climes, but given improvements in efficiency ... ~ to a solar-heated, warm pool, everywhere, soon.