Balancing several batteries

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Geert
Posts: 2
Joined: Wed Nov 09, 2022 1:19 pm

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?
Solis Hybrid RHI-3K-48ES-5G (2022)
8x Trina Solar Vertex 390WP(facing East)
2x FoxESS LV5200
Omnik 3000k (2015)
21x Solar Frontier 170Wp (facing West)
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Will
Site Admin
Posts: 175
Joined: Thu Oct 13, 2022 5:56 pm

normally you fully charge and discharge them fully and then full again normally balances them
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Geert
Posts: 2
Joined: Wed Nov 09, 2022 1:19 pm

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.
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Screenshot_20221115-132005_SolisCloud.jpg
Solis Hybrid RHI-3K-48ES-5G (2022)
8x Trina Solar Vertex 390WP(facing East)
2x FoxESS LV5200
Omnik 3000k (2015)
21x Solar Frontier 170Wp (facing West)
User avatar
Will
Site Admin
Posts: 175
Joined: Thu Oct 13, 2022 5:56 pm

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?
Community Admin / FoxESS Professional

Buy me a coffee or Book a zoom meeting for remote consultancy

FoxESS Quad Inverter Installation
4 x H1 Series Inverters
24 x HV2600 (62.4kWh)
32 x 490w Array
Dual Tesla Household
Heatpump & Low Carbon Housebuild
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