Using 4 hours of full sun gives you this equation.
How much kwh does a solar panel produce per day.
250 watts x 4 hours.
In the example above the solar panel is producing 1 5 kwh per day which ends up being about 45 kwh per month.
To figure out how many kilowatt hours kwh your solar panel system puts out per year you need to multiply the size of your system in kw dc times the 8 derate factor times the number of hours of sun.
If you multiply 1kwh per panel by 30 days in a month you ll find that each 250 watt rated panel will produce about 30 kwh in an average month.
So if you have solar panels that each produce 1 kwh of power per day you would need a full 37 solar panels to fully power your home.
That s enough energy to power some small appliances without too much issue but if you want to cover the energy used by your property s climate control systems or large cooking appliances you ll need more solar panels.
So if you have a 7 5 kw dc system working an average of 5 hours per day 365 days a year it ll result in 10 950 kwh in a year.
That s 1 kwh 1 000 watts in a day per 250 watt panel.
However keep in mind that there are many factors at play here so this is really only a rough estimate.
If we take california as an example the map shows that on average 1 kw of dc peak capacity of solar panels produces 4 5 kwh per day or 1642 kwh per year.