Interested to know how many kilowatt hours (kWh) your new solar panel system will kick out per year? All you gotta do is multiply the size of your system in kW by 78% of the number in the shaded region you live in the map below. Then, bingo you’re good to go!
For example, let’s say you live in Arizona and are thinking about installing a 5kW solar system.
For the sake of the example, lets say you’re living in the “2000″ shaded region.
Next, multiply 5 (since you’re considering a 5kw system) by 1560 (78% of “2000″ is 1560) to arrive at 7800 kWh.
That means on average your system will offset 650kWh from your monthly electric bill (7800 divided by 12 months equals 650 kWh).
If you’re paying $0.11/kWh, that amounts to $71.50 saved per month ($0.11 x 650 kWh = $71.50)!
how did you come up with 78% and where did you get the map? how was the map developed?
Hi Fakhrul,
The map is a solar radiance chart from DOE. 78% reflects the total assumed energy delivered by your solar system accounting for three specific losses:
PV Energy delivered as % of manufacturers rating: 95%
Wiring & power point tracking losses: 9% (91% delivered)
Inverter Efficiency: 90%
Total Energy Delivered 95% x 91% x 90% = 78%
Can you cite your source please? What’s DOE?
i have read many articles about set up of solar system, initial coast have heavy amount. i have land for agriculture and i want electricity through solar for every operation.but i cant understand about role of my indian govt.
Dan: Very helpful stuff here. Thank you. Can you explain what those numbers (2000 for AZ) from the radiance chart actually mean?