My 32v sentry charger occasionally surges, meaning it will come on for a few seconds, shut off, and repeat several times. I can "reset" the unit by flipping the breaker for awhile and it seems to correct itself. I have tried to pinpoint whether there is a certain electrical source that would trigger the action, but have fallen short. I have checked the batteries and they all have sufficient fluid levels. Search results haven't reflected anyone experiencing these symptoms. One other concern is my power bill is climbing month to month will no AC use anymore leading me to believe the charger may have something to do with it.