Solar power kits and panels allow RV'ers to harness the power of the sun for heating small amounts of water and for cooking. They are available in varying sizes and power capacities. Price varies accordingly. In addition, there are adapters that allow campers to use solar power to charge their electronic devices (such as cell phones, laptops and camera batteries in case you can't completely disconnect from civilization).
Lighting in RV's tends to come from standard halogen bulbs. You can reduce your electric usage by up to 75% by simply switching to power-saving bulbs or using LED lights. The bonus with LED lighting is that there is no heat produced, unlike other types of lighting.
Unless you go with a composting toilet (which may be more trouble than it's worth unless you are full-time RV'ers!) you will need to use products to keep waste under control. One of the products we recommend (and yes, there are others) is Pure Power Waste Digester which is chemical-free, safe to use in all septic systems, and harmless to children and pets. Pure Power, combined with Softness 2-Ply RV toilet paper (which is made to break down easily) keep your holding tanks in good condition and have a much lower impact on the environment than other products