Low prices can be very attractive but keep in mind that solar panels and their installation is not cheap. If a vendor has extremely low prices, you are probably getting low quality equipment or even second hand equipment. It is best to invest in quality solar panels and hire a trustworthy contractor to install them.
Do not install a solar system in your home without first doing an energy audit. An energy audit will assess your energy needs and will help you utilize savings before installing a solar system. The last thing you want to do is install a solar system to pay for energy you are wasting.
This is an updated version of a charge controller circuit I’ve had up for a while. Link http://bristolwatch.com/solar_charger.htm.
Before installing solar panels on your roof, check with your home owners association. Some associations have restrictions on what you are allowed to do to the outside of the property, and this might mean solar panels are not an option for you. It is better to have this information up front than to purchase the panels and be forced to remove them at a later time.