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What happens to the power my panels generate when I’m not in my vacation home?

When you are not using your house, you presumably generate more electricity than you are using.  You get credit from NSTAR for any energy you generate but don’t use yourself.

When you need more energy than you generate, you will take advantage of the credit you previously generated.

You should size your system to generate all the electricity you use on an annual basis, so that over the course of a year it will all balance out.

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