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Do you have enough roof space that’s facing south or as near as possible to south? The further from south your roof’s orientation, the less effective your panels will be.
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Are there any obstructions to the sunlight hitting your roof such as trees or nearby buildings? Obstructions that block the sun will have a negative effect on the output of your array.
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Is the inclination of your roof suitable for a solar panel array? 30° from the horizontal is optimal.
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