Think winter. That's when ya need the most..
Plus 10 degrees. That gives you the "Better" angle for winter and you won't lose much in the summer. (Because of the longer days) It also puts more angle on the array so the snow can roll off. It's a happy medium..
Normally it's +15 for the winter (Dec) and -15 for the summer. (June) *If adjustable*
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If it don't, I'll always think it shoulda..
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