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How much area of PV are you going to have that is pointing at the sun???
4-5 sun hours per day tends to be pretty average unless you live in Arizona, lets say your electrical loads are only 100 watts, that is nearly 7 square feet of PV panels to have a 100 watt output, I assume that if you are making a faring that you are ridding a distance every day, not just a few miles, so half hour each way is 100 watt hours or more just from the head lights and ignition of the motorcycle, 7 square feet of fairing that is pointing at the sun is a lot of fairing! 2 square feet of fairing that has a good angle and is pointing at the sun at any given point of the day is more realistic so at that point your faring is just covering your lights and ignition of your motorcycle for your commute with no extra!
Like others have said, make sure you have your needs covered before worrying about how much extra you will have.
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