question

Simon Ytterbom solved the mystery. The multiplus was configured to use an "assist" program in the settings that required communication to the VE BMS. Since the VE BMS is no longer "talking" to VE batteries (the EG4 is not a VE battery) the multiplus would not charge it. As soon as I removed the BMS "assist" feature from the multiplus configuration, the multiplus started charging the EG4 battery.

Now the problem is the multiplus or VE Connect app shows a continual power draw, reducing the SOC on the new battery even though the battery is actually at 100%. I can go in and manually reset the SOC to 100%, but the refrigerator and other AC loads are being misintrepreted by something as DC loads (when they are NOT) and the Connect App shows a constant decline in the State of Charge when the battery indicates 100%.

Any suggestions?

There was another problem that kept the EG4 battery from charging/connecting: The 220 Battery Protect was configured with the jumper removed, a wire connecting the BMS to it (as a relay) had to be re-configured in 8C and the original jumper placed across the (remote) posts to re-enable this device to function as it was originally intended as a stand-alone appliance. Lesson Learned: When no longer using the VE BMS system, there are several VE appliance reconfigurations necessary to get the VE system working with non-VE LIFEPO4 batteries.