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.
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It is vital that the person who installs your solar power system is actually licensed to do so. An installer who is not licensed may install your solar panels incorrectly, or they may violate local regulations. In addition, a licensed installer can provide you with great information about these regulations that an unlicensed installer cannot.
The amount of energy your solar panel will produce is rated by watts. For example, if your solar panel is rated 100 watts, then on a clear day, your solar panel will produce 100 watts per hour. To find out how much electricity you need to produce, look at your electric bill and divide the total by 30 days and then divide it by 3 as there is generally bright sunlight one third of the day.