I have a Multiplus II 48/3000/35-32 - it is used as a UPS for my house and has no solar etc. connected. The only way for it to charge the batteries is using the grid. I have storage mode enabled as the batteries does nothing for long times until there is a power failure.
The battery state of charge was at 100 % today, and the inverter was in storage mode.
We then had a 2.5 hour power failure, and the battery state of charge went down to 91 % .
The grid came online, and the Multiplus II just went back into storage mode. The problem with this is that the batteries are charging very slowly now, and they will never charge back up to 100 % - the only way for that to happen is to restart the inverter.
Also, we are having another power cut in 4 hours, and by then the batteries won't be fully charged...
What am I doing wrong?