How many solar panels will I need for my home?
The number of solar panels you'll need for your home will depend on several factors. One simple way of answering "How many solar panels do I need" is to let a local solar installer look at your home and give you a quote for system size (including number of wattage of panels), cost, and estimated annual and lifetime savings.
Another way, is to look at your electricity bill to get your home’s hourly energy usage, multiply that by the peak sunlight hours for your home (3 to 4 hours on average), and divide by 400, which is an average wattage for solar panels (although they can range from 350 to 460).
Hourly energy usage x peak sunlight hours / 400 = number of panels. This typically ranges from 17-42 panels.