When calculating the number of solar panels to install on your roof, you first need to determine how much sunlight you will receive each day. Then you can estimate the amount of energy your solar panel will produce. A typical American household uses about 900 kWh per month and has a maximum solar radiation of about 5 hours per day.
Average US household energy consumption is 10,715 kWh per year. If you live in central Canada, you don’t get as much direct sunlight as the sun does in the northern parts of the world. So for 1000 kWh per square meter, you may need up to 82 solar panels.
Another consideration is how much sun you get throughout the year. A solar calculator will help him estimate the number of panels he will need to generate 1000 kWh of electricity in a given month. Peak daylight hours are shorter in winter. Also, some months are more sunny than others.