Be realistic about the costs of having a solar energy system. If you're paying much less than other systems that are around the same size as yours, you may have poor equipment or installation work. Like with many things in life you get what you pay for. Quality installation work and equipment isn't going to be cheap. You may have substantial savings by going with a large company, but other companies may be cutting corners to keep costs down.
Solar panels are not very easy to install, so you should hire a professional to get the job done. While you will save a bit of money by trying to do it in your own, you do not want things to be less than perfect. Also, you will most likely end up paying someone to come out and fix the mess you made.
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If you're interested in a particular solar panel model, determine when this panel was created. There are very efficient modern solar technologies; however, iffy solar energy salespeople sometimes sell old technology. This older technology is more affordable but you will get much better results with a more recent product.
Solar power is a good thing to consider if you use a lot of power and your roof gets a minimum of five hours direct daily sunlight. The money and energy saved by installing solar panels is well worth the energy invested into installing them.