Well, also keep in mind, that each state also has a tax relief for those solar systems, so a 30k system with federal and state tax breaks will cost about 15k. When you add that and then if you actually live in a state with alot of sun, if you produce more, you can add to the network grid and will be paid by the electric company for what you have produce for them...... there are systems out there that i believe have a computer program tied to them so you can monitor the entire set-up..... well worth the investment imo.

most solar panel systems will have a roi that ranges between 5-10 years depending on where you are located.