I would guess that the 100% indication is based entirely on the voltage at the meter connection. That may or may not be close to the terminal voltage across the battery bank. And the battery voltage is only weakly indicative of the battery SOC when there is current flowing (either charging or load current.)
In your case the internal resistance of the battery or the resistance of the charging circuit is causing the meter reading to depend far too much on the current from the CC.
It may also be a sign that your battery has a low effective capacity, having lost life to sulfaction, plate corrosion or other failure modes.
In your case the internal resistance of the battery or the resistance of the charging circuit is causing the meter reading to depend far too much on the current from the CC.
It may also be a sign that your battery has a low effective capacity, having lost life to sulfaction, plate corrosion or other failure modes.
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