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Javier Pardo avatar image
Javier Pardo asked

Pylontech US2000B + Pylontech US2000C high voltage alarm

Hello, I have been installing a Victron Quattro for a few months with a set of 6 Pylontech batteries, model US2000B. Everything has worked perfectly during these months.

Two days ago I added 6 new Pylontech model US2000C batteries to the set for a total of 12 batteries.

The installation is carried out as recommended by Pylontech, that is, the master battery is a US2000C, from the second to the seventh they are US2000B and from the eighth to the twelfth US2000C.

Yesterday I had the system working without problem, the batteries charged up to 100% and then discharged overnight up to 25% as usual.

But right now a high voltage warning has just arrived when they have reached 98% charge.


The notice clears every minute and reappears again.


At least 10 notices have already arrived.


I do not know what I can do.


Any recommendation? I don't know what to do and I'm a little scared by this.


Thanks in advance.


Update 1: The battery now indicates that it is at 100%. It seems that the alarms have stopped, but I don't really understand what is happening or if there is something that is not working correctly. Could someone give me any indication? Thank you.

2021-04-29-18h49-41.jpg

Update 2: Attached my charger settings, if that helps.

screenshot-20210429-191420.jpgscreenshot-20210429-191441.jpg


Notes:

- Quattro firmware version is 430

- MPPT chargers version is 3.02

2021-04-29-18h41-20.jpg


2021-04-29-18h39-46.jpg


Pylontech
2021-04-29-18h39-46.jpg (50.2 KiB)
2021-04-29-18h41-20.jpg (34.7 KiB)
2021-04-29-18h49-41.jpg (42.3 KiB)
screenshot-20210429-191420.jpg (81.6 KiB)
screenshot-20210429-191441.jpg (133.4 KiB)
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2 Answers
seb71 avatar image
seb71 answered ·

Probably the new batteries have cells which are not yet balanced (equal state of charge/equal voltage when fully charged).

You can temporarily lower the charging voltages and also maybe decrease the maximum charging current.

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Javier Pardo avatar image Javier Pardo commented ·

Hi @Seb71, thanks for your kindly reply.


What I do not understand is that yesterday the system was working wonderfully, as I said, loading to 100% without giving any kind of alarm.

Is it normal this alarm occur today?


On the other hand, you speak of modifying the charging voltages, but what would then be the indicated values that I should put? and what would be the best way to do this?


I would not like to create more problems so I would appreciate timely indications to be able to carry out the steps to solve the problem.


Thank you very much in advance.

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seb71 avatar image seb71 Javier Pardo commented ·

Maybe my answers from this thread would help.

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Javier Pardo avatar image Javier Pardo seb71 commented ·

Thanks again @seb71


I see that this is a common problem on newer systems. As I mentioned previously, I have been using the Pylontech US2000B batteries for several months without any problem and that is why I was a little scared to see that this happened now after having installed the new US2000C to battery pack.


I understand that over time (hopefully a few days) these messages will disappear and all batteries will balance out.


My question now comes to know if it is necessary to update the firmware of any of my devices or I can be sure that this is not the problem.


Thank you.

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seb71 avatar image seb71 Javier Pardo commented ·

I think in your case the issue is cell inbalance.


I like to keep the firmware up to date, but any software update has a risk of breaking some things.

On the other hand, when adding some new devices sometimes the firmware updates are mandatory (but I can't say this is your case or not). If you go by this, you should update.


Have you done firmware updates before (especially for the inverter)?

For the inverter you have to save the settings (and any assistants) before the firmware update and load them back after the update. Read the instructions if you haven't already.

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nickdb avatar image
nickdb answered ·

First step is to make sure you followed best practice properly:

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

After this, probably best to get the installer involved, victron don't provide support to end-users, they offload it to the local distributors and resellers in your area.

High voltage alarms should resolve within a couple of days on new installs, after 3 months it is best to check the configuration.


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Javier Pardo avatar image Javier Pardo commented ·

Hi @nickdb, thanks for your reply.

Yesterday a high voltage alarm message reappeared in the system, which, like the previous time, disappeared a few minutes after reaching 100% load.

Today the charge has been made up to 100% without triggering any type of alarm, so I understand that the problem is being solved. We will see tomorrow if everything returns to normal and there are no problems either, but apparently it was all due to an unbalanced cell as all of you mentioned.


Thank you very much for your responses.

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