MultiPlus-II sudden low battery alarm while battery is full (BSL stubby)

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anrich asked Nov 17, '21

MultiPlus-II sudden low battery alarm while battery is full (BSL stubby)

Update 25/11

The battery once again gave a low voltage alarm while about 80% SoC, causing the inverter to restart. There is clearly something wrong. My best guess (based on many informed opinions) is a serious BMS firmware bug or design flaw. It could also be severely unbalanced cells, or a faulty cell. BSL is apparently working on improving the firmware (they're aware something is wrong).

I'm working with the installer to have the battery exchanged for something that actually works reliably. I would not recommend buying a BSL stubby for the time being, at least not until they sort the BMS issues out.

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Hi,

Hardware details:

1 x MultiPlus-II48/5000/70-50 230V
- Firmware: v481
1x BSL Battery LiFePO48 Battery 8.2kWh (160Ah)
1 x SmartSolar MPPT 250/100-Tr VE.Can
12 x LONGi 450W mono panels
Cerbo GX
ET112 Energy Meter

Setup details:

Grid connected to AC-IN
- Grid feed-in is disabled.
AC-OUT-1 is feeding essential loads (no more than 2000W, average about 300W-700W)
AC-OUT-2 is feeding geyser (on timer 10:00-15:00) and stove.
ESS mode: Optimised (with BatteryLife)
The system is less than a week old and has been running perfectly up until a few hours ago.

Issue description:

The inverter suddenly shut down and started up on its own after a minute or two. The battery was about 99% SOC when this happened.

The following alarms occurred:

On VRM I can also see there was a "High DC ripple" warning at the same time.

The system ran fine after that for a while after which the same thing occurred again, but this time it coincided with a grid failure (load shedding). The same alarms occurred:

During both occurrences, the load on the inverter was at most 500W (nothing was switched on additionally when it happened).

Does anyone have an idea what the cause could be? I'd appreciate any input.

VRM images (please let me know if other log data could be useful):

I did also notice on the MPPT daily history, the minimum voltage for the battery today was 44.72V, which seems very wrong:

Usually it discharges to about 45% throughout the evening, and then the minimum voltage hasn't fallen below 51V before today:

Multiplus-II Lithium Battery voltage low battery warning

screenshot-from-2021-11-17-18-56-29.png (31.9 KiB)

screenshot-from-2021-11-17-19-42-57.png (37.0 KiB)

screenshot-from-2021-11-17-19-50-18.png (40.0 KiB)

screenshot-from-2021-11-17-19-50-57.png (40.3 KiB)

screenshot-from-2021-11-17-19-51-38.png (28.1 KiB)

screenshot-from-2021-11-17-20-00-56.png (22.2 KiB)

screenshot-from-2021-11-17-20-03-25.png (22.5 KiB)

vebus-warnings-and-alarms.png (12.6 KiB)

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nickdb answered · Nov 17, 2021 at 06:20 PM

I have two of these batteries and they are having some teething problems.

Check the bms firmware. On the current release (1.07) they are reporting an incorrect SOC during charging so it could be that you hit that issue.

Check the install and have a chat to your supplier.

An easy way to identify this issue is to look at the bms soc chart on vrm. If it is making big jumps in charge, then that could be contributing.

If the reported SOC is wrong it will break all ESS protections and eventually trigger a low voltage condition.

It sounds like you hit the low voltage cutoff and the inverter restarted once it reached the minimum start criteria.

4

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nedee commented · Mar 17, 2022 at 08:33 AM

Any news on new firmware from BSL Battery to solve the SoC reporting bug in 1.07?

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nickdb ♦♦ nedee commented · Mar 17, 2022 at 08:56 AM

No. Are you seeing it also?

I actually changed to a different BSL model and it has the same issue so we're having to dig into what the BMS is up to, which is taking time.

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nedee nickdb ♦♦ commented · Mar 17, 2022 at 09:48 AM

Yes, same issue. As soon as solar charging picks up steam in the morning it goes to 98-100% in an instant despite high power charging. Discharge SoC profile seems fine

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nickdb ♦♦ nedee commented · Mar 20, 2022 at 10:53 AM

Exactly the same as mine, on rare occasions where it doesn't happen the SOC tracks up to 30% early to 100%. BSL first tried to blame the installation until others had the issues. We're now waiting for a reader to log BMS activity.

SOC is a read-only metric from the BMS so you can't blame anything other than the BMS.

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Answer 1 · 2021-11-17T18:30:30Z

anrich answered · Nov 17, 2021 at 06:30 PM

Thank you, it's very helpful to get feedback from someone with the same battery. I did not consider the BMS firmware.

The SOC chart looks quite normal (to me at least, I'm very new to this. It does look similar to the past few days though).

It does however seem like the battery firmware is on 1.0. It's obviously old if there's already a 1.07, but it is quite strange that this starting occurring so suddenly (but yeah I guess software can do strange things very suddenly).

screenshot-from-2021-11-17-20-24-40.png (26.5 KiB)

screenshot-from-2021-11-17-20-25-37.png (23.8 KiB)

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nickdb ♦♦ commented · Nov 17, 2021 at 06:34 PM

There could be a sticker on the battery with firmware.

Unfortunately the gx only reports 2 digit firmware versions and we need 3.

That soc curve looks fine to me, so it could be something else - the issue only appears in later code.

Look for the the bsl configuration guide here - will get the link, you need to follow the setup criteria properly.

They are good batteries but this is a brand new model and it has a few quirks.

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anrich nickdb ♦♦ commented · Nov 17, 2021 at 06:43 PM

I can't seem to find a sticker with the firmware version, but the manufacturing date seems to be 2021/08/18. It's wall mounted and the sticker could be behind a part of the bracket. The installer is coming to inspect the system tomorrow, will provide feedback.

I found a QR code on it that links to the configuration guide. Will have a look in there, maybe I can spot something.

Here's the guide for anyone that might be having similar issues: https://drive.google.com/file/d/149FGH_WIZzeraO-xgy9EuU3p62gPE9Mi/view?usp=drivesdk

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Answer 2 · 2021-11-17T18:35:50Z

nickdb answered · Nov 17, 2021 at 06:35 PM

Follow this guide and the embedded pdf document

https://www.victronenergy.com/live/battery_compatibility:bsl

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Answer 3 · 2022-06-29T20:26:16Z

Alexis Kalogerakis answered · Jun 29, 2022 at 08:26 PM

Hello.

Seems that the battery is not fully charge because hit 100% and bms give order for 0amps.

What is the maximum voltage that this battery can go before over voltage alarm 56.5v?

You can find CVL inside parameters in gx device.

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Answer 4 · 2022-08-11T11:53:07Z

pedaaa answered · Aug 11, 2022 at 11:53 AM

@nickdb:

i now also got my System with BSLBatt B-LFP51.2V 100Ah running. My BSL´s run on Firmware v1.0.

I asked BSL what the latest Firmware is, and how i can install it.

The answer was:

Don´t not touch Firmware, if you haven´t permission from BSL.

Think this is kind of strange.

Ususally i always update all devices to latest Firmware, at initial startup/setup of applications...

Anyhow.

Do you know whats latest Firmware version would be?

And how to install it, if needed?

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nickdb ♦♦ commented · Aug 11, 2022 at 12:12 PM

Hey @Pedaaa, They should arrive with current firmware (usually a little sticker stuck on the front with the version). The GX only reports the first two digits which is pointless since the most relevant part is the third digit. I returned mine for another brand but at the time is was 1.07, it has probably moved by now.

I understand some batteries got worked on, sounds like BMS replacement or changes to address issues, but it didn't seem to resolve SOC wander.

Only authorised people may update the batteries, the importer required you to attend a battery course in order to be enabled, so you will need to have a chat to them, check if you qualify to attend.

(not that it is a complicated process)

Most battery suppliers don't want them updated unless there is a specific issue to resolve.

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MultiPlus-II sudden low battery alarm while battery is full (BSL stubby)

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