The amount of electricity your solar panels produce depends on the climate and peak sunlight in your area, the relative efficiency of the photovoltaic (PV) technology of your panels. More efficient panels may be little more expensive.
Energy produced / year = System’s kW X Sunlight hours/year X System efficiency %
How much does a 10 kW solar system produce?
Step 1: Let’s say you receives about 4.5 sun hours on average every day. Multiply 4.5 hours times 365 days/year to get sun hours / year.i.e.4.5 x 365= 1640.
Step 2: Now multiply system’s kW size with sun hours/year to get energy produced in one year (i.e.kWh). For example: 10 kW x 1640 hours = 16400Kwh.
Step 3: Consider system losses – Energy losses occur at every step of the way including Inverter losses, DC/ AC cables losses,losses due to dust, snow etc. Most solar panels lose about 18% of their rated energy production. So system efficiency% will be 0.82.
In short, a 10kW Solar System will produce 10kw x 1640h x .82 = 13448Kwh/Year.
Keep in mind that this is a rough estimate. Actual value may differ based on a site location. Contact a solar installer to figure out how many panels you need to produce enough energy for you to use.