Keep shade issues in mind when installing solar panels. A panel that loses a quarter of its light can lose half its power production. The main thing to keep in mind is tree foliage. Are any trees going to grow in between the panels and sunlight? Consider trimming them back a little.
Use winter sunshine hours instead of summer hours whenever you are calculating how many solar panels you will need. This is because winter sunshine hours only add up to about half that of summer. It is better to overestimate how many panels you will need rather than underestimate. If you underestimate, you will end up losing power when you need it.
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If you are buying a solar energy system, make sure your panels can be easily adjusted. As seasons change, so does the angle of the sun. Your panels will need to be adjusted every three months or so. Make sure that you know how to do this or talk to your contractor about seasonal maintenance.