However keep in mind that there are many factors at play here so this is really only a rough estimate.
How many kwh does a solar panel produce per hour.
30 panels x 250 watts per panel equals a 7 500 watt system 7 5kw.
So take 900 kwh and divide by the amount of kwh one solar panel produces over the course of a month 30kwh and you get a 30 panel installation.
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.
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.
On average a normal household will use around 37 kwh per day.
From the example of a standard residential polycrystalline solar panel we used above we know that if one 275 watt solar panel is 18 85 square feet then 1 kw 1000 watt of panels will require 3 63 of such solar panels and so will take up 68 42 square feet.
People by solar by the kw or the maximum amount of energy the panel produces in an instatnt but the utility charges for kwhr or how much energy you use per hour.
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.