Balancing several batteries

[Geert]

I have a Solis hybride inverter since july, and added a second LV5200 battery last month.

I noticed during charging the leds on the batteries are not the same. The master battery indicaties...40 to 60%, the slave battery 60 to 80%.

As result, the Solis inverters jumps all of a sudden from 70 percent to 100% (after a sudden rise in battery voltage)

I suspect the 2 batteries are not in balance. Anybody any idea´s how to solve this?

[Will]

normally you fully charge and discharge them fully and then full again normally balances them

[Geert]

Hmmm....

Somehow when the batteries are empty (according Solis), I can see the main battery one led blinking, so between zero and 20%, but the other battery is between 20 and 40%.

Yesterday it jumped from 35% to 100% on Solis. And we discharged it completely over the night, it looks like we discharged almost 8 kWh?

It is a strange situation.

[Will]

Have you tried a full empty to full cycle and restart the inverter when the battery is full and make sure the voltage and SOC are showing correctly?