I looked it up in the online manual. It says, “ A battery DOES NOT have to be installed for WF-8900-AD-MBA Series Main Board Assembly to operate.” So a disconnect switch would give me peace of mind that the batts would not get overcharged sitting at home plugged in. As for why I think I need this much battery storage? When we are out in the backcountry in Idaho we need it. We rarely visit campgrounds with hookups. Usually we spend two to three weeks at a time, depending on how much work leave is available. I don’t share any bias for or against those who boondock or not and believe that RV’s should operate properly and as expected or we should hold the manufacturer accountable. How responsible they are is an important part of our conversations here.
I’ll let you know if my batts are hurt by the WFCO converter.