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Here is a paper on [http://www.macslab.com/optsolar.html Optimum Orientation of Solar Panels]. However: * anything less steep collects snow and dust. If you lose your first three hours of sunlight because you've got snow on the panels, it doesn't help your efficiency. * The owner of [http://bonmot.ca/ship/site.cgi?site=ns.kin-1 this offgrid house] claims that the totally vertical panels are best because they don't collect dust; the panels can be washed regularly but if you don't do that, their efficiency goes down.
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