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Teaching Groups How To Design Their Own Systems

Step One. Determine the amount of light that will hit your roof cumulatively annually. Get to know a Sun Chart, and learn about the national averages of irradiance, provided by NREL.

Step Two. Determine the angle that you can position the panels, in terms of degrees of the angle of the roof and orientation of roof to South-facing.

Step Three. Acquire a determination of the number of actual modules you can fit, using a ruling law. At this point, select the type of modules to establish footage squared as well as your wattage rating of panel, to determine annual kilowattage. Establish the maximum and minimum number of modules legally allowed in series, using the temperature / voltage coefficient provided in the NEC.

Step Four. Determine an inverter, based on the ratings of your PV Array.

Step Five. Use the plans that you have established with your licensed installer / system designer, approach various installation companies with a bid for the contract to build the system that you have designed.


If you don't grasp everything 100%, that's perfectly alright. You can always email and ask me about the things that you don't understand.

Do not let private companies design your system for you. Make sure you do as much of your own homework as possible. Because you wouldn't let some guy put a time flux capacitor in your car just because there was a government rebate and you knew what it could do. A private system designer is unbiased in approaching the situation, will not fudge numbers, and dictates to the installer what you expect from them.


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