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Draining any type of lead acid battery below 50% shortens the capacity and life. Usually by about half.
If the batteries are run below 10v the charger on the solar may pop the 30a fuse connected to the battery. If you look at your solar remote, the top line is the solar panel information and the bottom line is the battery. when it's sunny, you want to see 26+ volts in the top left corner and 12+ in the lower left. The lower right should say "BLK" for Bulk.
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