Battery recharge after dry camping trip

Your WFCO converter may be the source of your problem. They are notorious for poor performance. The newer ones are supposed to function as a three stage converter automatically switching to the most advantageous stage depending on the charge state of your battery. The problem is that they often "stick" in the wrong stage and don't charge a depleted battery very fast. If my battery is at half charge it takes days and days for the on-board WFCO converter to bring it back up to full charge when connected to shore power. But if I use a portable stand-alone charger my battery recharges in just a few hours.