Each panel produces a different amount of electricity for the year depending on it's placement and orientation. We determine how many panels you need based on your overall electricity bill for the year, and how many panels would produce more than 100% of your usage in order to offset your usage for the year. In some cases if you're planning on buying an electric vehicle or expanding your home with an addition, ADU, pool or other home improvement projects, you may need more panels. We're here to help with that calculation.