Understanding How a Panel Works can help you decide what type of Productions and Quality it is you are looking for. The cost of the system is determined by the size of the system. You may be able to get away with lower priced panels if you have the rood or ground space for a higher quantity. You may want Solar but have a small roof, or no land for a ground mount so reaching for the higher priced panels that produce more may be a better option for you, as you wont need as high of a quantity.