The best way to calculate the number of solar panels you need is to look up your home’s hourly energy requirement in kWh over 30 days.
This is based on your monthly energy statements; you can ask your utility to calculate it. Multiply that by the number of peak sunlight hours in your area, which you can easily search online since it differs depending on the time of year and where you live.
Then, divide that number by your panels' wattage, either low wattage (150W) or high wattage (360W).
