Multiplus 12/1200/50-120V Charging issue

Q&A and troubleshooting
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1

I have a new Multiplus 12/1200/50-120V installed in a camper van.
LiFePo4 batteries and a BMV-712-Smart monitor.
The only settings changes to the Multiplus were to set the batty type with the switches.

When the batteries are discharged, they charge fine.
The monitor shows about 14.3 volts when fully charged and the monitor shows 100%.

We checked the monitor last night and it was 90% and is 86% this morning.
There is a small 1 or 3 amp load from lights, fan, etc.
Voltage is 13.8 volts.

At some point it should start charging again, correct?
Anyone know what that would be?

Are there adjustments to the charger settings that will keep this closer to 100% charged when plugged in to 120v shorepower?

2

The main control for the settled SOC is the float voltage, this is 13.8V and the battery should settle at 80-90% SOC. If the battery goes 0.2V lower a new absorption cycle will begin, but this is unlikely when hooked up to shorepower. You do not need to keep lithium at 100% like lead acid. In fact keeping them at 100% by increasing your float voltage can overcharge them according to some sources.

Personally I would not start making changes if you do not understand the risks, the system will work fine as is.