Discharge issue with AC300

For the third time in 2 months my B300 on a AC300 setup read in the forties S.O.C. then dropped to one percent with a very small load. I’m confident, or at least was, that the charge was there in that I monitor my wattage in and wattage out closely. I almost exclusively charge with P.V. except when this happens and I fire up the generator for a grid charge. Any thoughts-------------------

Have you tried to recalibrate your AC300/B300?

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@Maxfusion You can try to do a full cycle of charge and discharge to correcnt the SOC.