What size solar electric system do I need – and how many panels?

April 3, 2015

Our designer determines the optimal system size based on many factors, including each customer’s goals, the amount of electricity used, the time of day it is used, and the attributes of the solar array. The most accurate way to measure system size is in kilowatts (kW). For example, a typical 6.6 kW residential system has 20 panels, with each panel rated at 330 watts.