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Grid Tie
Sometimes, your solar electric system will generate too much energy—more than you need at that time. (This can happen during the summer, for instance.)
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At other times, your system won't generate enough power. (For example, at night.)
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Grid tying is one solution.
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When you tie into "the grid", you are trading electricity with PG&E (or your local utility).
You sell your excess power in high-yielding times (like summer), and buy back power when you can't generate enough (like at night).
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Assuming your set-up is calculated correctly, you should break even each year, selling to the utility as much as you buy back.
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