I've had the Zendure SBV6400 and a satellite battery for awhile now. Mostly used it for emergencies, but recently got an EV and wanted to try using the SBV standard 120V plug to charge it. I'm using an OEM level 1 charger with a standard NEMA 5-15 plug (pulls 12A from my wall outlet). When I plug it into the SBV regular plugs, I get an unknown error on the charger. Attempts to plug everything into the EV itself anyway do not work. Any ideas as to what's wrong or what I can try? TIA