How many PV solar Panels do i need? help me please !?
I’m working on a project/proposal of a solar panel for my school. To conserve the environment, money isn’t a problem since school got loads xD
My proposal is just to prove that usage of solar panels is more greener…For this i’m stuck at a place where i have to decide how many panels i’ll be needing and of what power…what batteries i’ll require..and things like that and also which direction should they be facing (PV solar panels)
Info:
- Out of 365 days, our school consume electricity during 180 days (rest are holidays)
- School consumes about 253 kWh per day, or 45000 kWh per year (180 days approximetly)
- The school is situation in western Europe (Switzerland), not on a hill or something…
- Area of the roof is about 1925 m squared.
Price doesn’t matter, i just want to know how i can place the PV panels and how many i’ll be needed, towards what direction they’ll be placed and how many batteries i’ll be needed to save electricity + consume is during the day.
Please tell me the formulas of how you’ve calculated all this so that i can put that in technique (calculations) section. I am doing this first time to i hope it works out.
Thanks a lot for any kind of help in advance !
253kwh over say 7 hours is around 35 kilowatts all the time. The PV panels for home use here give 5kw and are about 3 square meters, so you might need 20 sq m. However, the bigger a panel is, the less efficient (for technical reasons I don’t understand) so maybe 30 sq m. If you are not going to store the electricity in batteries, you need to be able to generate enough for the maximum peak load at whatever time of day that is, perhaps 9am or 10am. The peak may be 70kw?
It is probably not cost-effective to install panels for use 180 days a year, especially if you have holidays in July and August when there is most sun.
Some countries let you sell the generated kwh back to the electricity company at a good rate. This is much more cost-effective than you actually using your own power, and it works 365 days a year. Another financial incentive can be grants to help with purchase and installation. hope your project goes well.
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Go to BP solar energy. this will tell you all you need. i have used solar power in my work place to run security cameras ETC. you mite all so need to check up on the need of a back ut wind turbine?
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self use
I think you will find your school may be open 180 days per year but uses power for 365 days of the year unless the power is shut off on days the school is not open? A building has to have a certain amount of heat in the winter to keep the pipes from freezing even when empty and most heating systems have electric blower motors. How many hours of sunlight does the building get? You can’t count any time that the roof would be shaded by trees or by the surroundings.
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Almost certainly, you would want the system to be tied to the grid, and generating only a portion (perhaps the majority) of your energy. This way, there is no need for batteries, and the power will be reliable in the case of dark days or winter.
My advice is to contract a professional solar installer in your area. They can help you with the calculations, which would be based on your local climate and labor rates.
253 kWh per day is a conservative usage for a school – at least it would be in the USA. Cost will always be a factor, don’t neglect a careful accounting in your proposal. Our school district put in solar at a cost of several million dollars US per school, but we get more sun than Switzerland does. http://www.fhs.fuhsd.org/measureb/solar_panels . It was paid for by a special bond measure (property taxes).
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253kwh over say 7 hours is around 35 kilowatts all the time. The PV panels for home use here give 5kw and are about 3 square meters, so you might need 20 sq m. However, the bigger a panel is, the less efficient (for technical reasons I don’t understand) so maybe 30 sq m. If you are not going to store the electricity in batteries, you need to be able to generate enough for the maximum peak load at whatever time of day that is, perhaps 9am or 10am. The peak may be 70kw?
It is probably not cost-effective to install panels for use 180 days a year, especially if you have holidays in July and August when there is most sun.
Some countries let you sell the generated kwh back to the electricity company at a good rate. This is much more cost-effective than you actually using your own power, and it works 365 days a year. Another financial incentive can be grants to help with purchase and installation. hope your project goes well.
References :
It is a mamouth calculation, what subject are you doing? If it’s maths than the answer is completely different to a real life answer.
Installing solar panels is usually the last thing to do to a building after insulation and other energy saving measures.
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