I have a simple setup with a Multiplus 12/800/35-16 and a single Bluenova BN13v-108-1.4k
This is used in UPS mode.
The inverter inverts as expected during a lost of grid and charges back up when the grid returns. When the battery gets to full, there is a strange behavior where the inverter inverts around 10W always which runs the battery down. This will continue until there is a loss of mains which will trigger charging again.
I have observed this in firmware 489 and 490. I've tried toggling every setting I can think of. Reset the settings to defaults and configuring from scratch but the behavior persists. Screenshots attached (with no load for illustration).
I'm not sure why the inverter would be enabled if the grid input is within valid. The inverting light is also not on during this behavior.
Any ideas would be appreciated.
Update:
Around a day later with continuous grid supply connected, no load connected and no other fiddling the SoC has drained down to 75%