The recommended size of your system depends on your power consumption. If you want to completely offset (replace) your current electrical usage (purchases) from the utility with a solar electric system, the first step is to review your annual energy consumption which can be obtained from your utility bill. If you design an energy efficient home and use energy efficient appliances and lighting, you can reduce your electricity usage dramatically. The majority of the Puget Sound area home systems range from 5,000W to 8,000W, or 400 to 700 square feet of solar modules. Where you live, how you live and how you heat your water and house will dictate the size of your system and its total cost.