Hi everyone, I’m looking for advice in regards to how to get my plant to balance battery cells (5x Sunwoda Atrix-5 - 16S). According to https://www.victronenergy.com/live/_media/battery_compatibility:victron_multiplus_and_mppts_setting_with_sunwoda_battery.pdf , these are to be configured as follows…

It reached the point where voltage delta is the highest (>0.1V) and things get crazy. It starts auto-discharging after reaching 54.7V (the value the BMS originally set for max voltage despite mine being 55.2V). [image] At the same time the BMS reduces the max voltage by its own (this is a settin…

Apologies as I had missed your edit asking for the pictures. Top and second batteries seem to be the ones where the LEDs turn on and off so I guess these are the ones pending to complete the full charge. Everything: [image] Just the batteries: [image] Label on each: [image] Technical instr…

[image] Miguel J: Some battery modules enter the blocked state (I assume this is because these individual items are at 100% of their SOC). Yes, another user here has the same behaviour postet if a battery reaches SoC100. 3 batteries (3b) and 2 batteries (2b) chained. You have the SAME cabl…

Yes cable length is the same. Manufacturer-provided cables were used. The manufacture allows max. 3 batteries in chain? Manual says 4 actually (see below, Page 7), however my installer said they had confirmed with them this 5x configuration was perfectly valid and safe. Se pueden formar torre…

When batteries don’t behave themselves you really should contact their support. BMS’s of commercial batteries are usually locked down, only the manufacturer can adjust it. Only DIY batteries offer that flexibility but then come with other challenges. There isn’t a lot that can be done from the Vic…

Almost sequential yeah (SW0CGA0257270XXX → July 27th 2025 I guess). Label on the box matches for them all saying Production Date 2025-07-28.

To conclude, I’d like to say: your BMS is working well. The 50mV cell voltage difference seems to be within the normal tolerance range for the cells used. With a capacity of 5kWh and ~51V, your batteries deliver a substantial 100A. That’s a high figure, which means the internal resistance of the ind…

It’s not a 50mV delta unfortunately. 3.48 vs 3.36 is a 120mV delta unless I’m missing something. [image]

[image] Miguel J: It’s not a 50mV delta unfortunately. 3.48 vs 3.36 is a 120mV delta unless I’m missing something. But only at the end… SOC near 100. Your cell have a great dynamic, cause the have a very low internal resistance, I think. And your battery voltage guidlines (post 1) are clear d…

DVCC and battery cell voltage balancing - 16S Sunwoda batteries not achieving balance

DIY

MSl1 13 March 2026 11:42 24

The batteries within the stack have similar S/Ns? No jumps within the numbering?

Topic		Replies	Views
Coherence des SoC entre BMS JK Communauté francophone diy , cerbo-gx , jk-bms	25	205	9 February 2026
Unable to reach full charge voltage for balancing DIY parallel , bms-12-100 , multiplus-ii , victron_community , cerbo-gx	24	1114	22 November 2025
100 % Ladung Pylontech seit Firmware 3.5x nicht mehr möglich Deutschsprachiger Bereich	100	4404	20 April 2026
Target SoC is 100%. I want to lower it to 80-85% DIY diy , ess , dess , cerbo-gx	36	2290	13 August 2025
BESS speist PV gerne mal ins Netz statt in den noch weit nicht vollen Akku ein Deutschsprachiger Bereich vrm , dess , cerbo-gx	87	605	12 March 2026

DVCC and battery cell voltage balancing - 16S Sunwoda batteries not achieving balance

Related topics