[Richard and Rhonda]

Tim,

You probably have a shorted out plate in one of the batteries. Your float amperage is way too high as others have said.

Here is how I would identify the culprit Remove the cables from the batteries. Remember negative first off and last back on. Remove the cableing that connects the bank of batteries together. Wait 24 hours. My guess is one of those batteries will have a much lower voltage.

That one is the devil

I had this exact same problem with cooking the batteries. Found one of them had croaked.