Photocurrent in p-n junction solar cells flows in the diode reverse bias direction. In the dark, the solar cell simply acts as a diode.
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The controller is designed to prevent the back feeding of excess solar energy into the grid, particularly in situations where net metering approval is pending.
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This video will walk you through the process of fixing a faulty zipper, including identifying the problem and making necessary adjustments.
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Solar panels are essentially very large photodiodes. They have a reverse breakdown voltage like all diodes, but it is not very large, and for this reason a separate "blocking diode" is recommended if there is a risk the panel may be subjected to reverse voltage.
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