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How can a solar array power source be bypassed when the batteries run low?

Asked by JeanPaulSartre (5785points) May 13th, 2012 from iPhone

So I’m designing a solar array for my roof. I have a solid understanding of the components needed and the electrical knowhow to do it, but I can’t figure out how to get the power to automatically fail-over back to the grid if the batteries are low. Is this a function of the charge controller, the inverter, or something else entirely?

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