wow, you really showed me!! questions so hard it might take 10 seconds to find out on google. you really are a stupid asshole, aren't you?
A General Solar Equation
There are various equations for calculating how many solar panels and the amount of power needed for a household. Here’s a general example:
The average energy needs of a U.S. household is a 6.62-kW solar system to match the 9,000 kWh of average energy usage by U.S. households each year. And, the typical solar panel makes 320 watts of electricity in ideal sunny conditions. Here's how many solar panels that equals.3
Divide 6.62 kW (the system size) by .320 kW (the wattage per panel) = 20.69—rounded up that’s 21 panels. While your home is far from average, this is how you can calculate your own rough estimate.
https://www.sunrun.com/go-solar-cen...eeds of,electricity in ideal sunny conditions.
As far as most energy efficient or least systems to heat a home depends on where you live and other factors and how big your house is and if you want the whole house heated or just a few rooms.