Solar Energy Roof Installation
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Solar Energy Money Saving?
For a school project my group and I in class had to think of a way to help reduce or stop an environmental issue so my group decided we were to install solar panels on our school roof, a 5kw installation that costs $50,000 (we fund raised and have a grant which will cover the costs) I was wondering how much money and energy this would save us each year?
I need to know for our powerpoint presentation, any help will be gladly appreciated
thanks.
Knock about 20% off the peak power rating to calculate what you’ll really get from the array, considering the way panels are usually specified too optimistically, and system efficiency. So for you, let’s say 4 kW is the real power.
Then go to this site:
http://rredc.nrel.gov/solar/old_data/nsrdb/redbook/atlas/
and choose Average, Annual, south-facing tilted at latitude (or whatever is appropriate), and look at the map. The map will show you how many peak-equivalent hours of sun you get in your area. Let’s say the number is 6 for now, but you can look up the real number.
4 * 6 = 24 kWh average per day you should expect. This number is averaged over the whole year, so counts rainy days, winter, and everything else. Multiply 24 * 365 to find the kWh per year. Then check with your school office for how much the school pays per kWh, and you’ll have your cost savings per year.
If you’ve already raised the money, you might just use the 5 kW number, to get an optimistic savings per year. This will make the donors feel good. Also emphasize how long the system will last – long enough for students today to have kids of their own attending the school.
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