Your converter and solar charger have the necessary features to prevent over-charging, however, nothing in your system can prevent over-discharge. It's possible that the batteries were left in a depleted state for an extended period. At some point the damage is done and your converter and solar charger won't be able to heal the batteries. The chargers will try to raise the battery terminal voltage, but an internal shunt resistance (fault) will dissipate power, causing the batteries to swell. Bottom line, avoid over discharge. Best to only deplete your batteries no more than 50% of capacity.
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Al, K6IV
2015 30' Classic, "Chez Nu"
2014 RAM 2500 w/Cummins Diesel
ProPride Hitch, 400 W Solar
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