our school spends around $0,000 dollars on energy.we want to know how much money would installing solar panels on the roof save our school.
What you are really looking for is ROI. Return on investment. If you spend 0K up front how long will it take to recoup that 0k. The answer is too long. Solar panels are not and never have been about saving money. They are about trying to save the planet. So if your school wants to go green then they should do it but the overall cost will be higher.
Your school spend $0,000 per month or per year?? Photovoltaic (Solar Panel) panels have a really large initial capital investment. If you live in a location (e.g. West Coast Desert, SoCal) where there are many sunny days so you might be able to break even quicker. Also note ,there are state and federal grants that can help ease the capital cost. Energy demand keeps going up so expect our current rates to double. People who have alternative forms like wind and solar will have the advantage when this time comes. Just think of when the US had it's oil crisis in summer of 2008, people with small efficient vehicles such as Prius's didn't feel the price increase like the people who bought cheaper large SUV's.
I can tell you for a fact you can save money with solar panels. I have a system. I have a 3.74 kw dc system which cost $26K, I got a $0K rebate from my utility and a $2K fed tax credit. I will break even or get ROI in 6-7 years. My system generates about $2K of energy per year. The benefit of a school is most of the energy will be produced during the time that the students are using the facility so you may see a better return. I still use much of my energy when the sun goes down. All businesses get a 30% fed tax credit when they install a system, and many states offer larger rebates to businesses. There are many factors that will determine the efficiency of the panels, my orientation isn't ideal so that drops my production a little. Shade can reduce the number of hours a panel can produce. The number of hours of sunlight and the number of days it is cloudy can affect production as well. Your utility policies can have an economic impact, not all utilities allow the meter to run backwards or buy back the excess energy you produce, most schools are out of session during the longest most productive days. The biggest problem for solar is the large initial payment, without grants or loans it is unlikely a school would have the money to put up a large system. There is no need to zero out the bill, even a partial system can save money.
Where do you live? In almost all areas, solar power is currently really expensive. It looks like it'll be 0-5 years before they're cost effective... sorry to tell you! If your school is a tall building with few similarly tall buildings/trees around it then mini-wind turbines might be worth a look. You'd have to measure the wind for a year or so to get an idea of whether it's worth it though - in most cases mini wind turbines aren't very good either!
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