Most always when hooked to shore power, your battery gauge in the panel will show full ... even if you have a 3 stage charger in the converter. Check voltage at your battery hooked to shore power ... it should read north of 13.4 - 13.8+ VDC . Maybe you hooked the battery up backwards at some point and blew the reverse polarity fuses in the converter itself. They are easy enough to check and replace.
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