question

Hello

Problem still exists. Today I got again some alarms in my system: "Pylontech battery Alarm Internal Failure" in combination with a "low temperature" warning. The batteries themselves doesn't show any red LED or any visible alarm signal.

Since the last time when I have seen this message I upgraded to the actual release candidate Firmware 2.60~25 - I hoped this will perhaps solve it. Obviously not. But we had in the past days very bad weather and so today it was the first time the batteries were charged to 100%. It looks to me that it happens when the batteries reach the first time 100% SOC.

Perhaps the following information if helpfully. When I look at the temperature of the batteries it shows at the time of the alert a drop from 23°C to 21°C. Nevertheless 21°C is not bad.

Does anybody have an idea what does this Alarm mean in detail? "Internal", ? Does it direct to an internal error of Victron system or "Internal", does it direct to an internal error of the pylontech battery?

A specific unit? But how to find out which battery unit does cause this. The message itself is somehow "small" of information to me.

In the Alarmlog as device is mentioned the battery monitor with a figure [512] Any idea what does [512] direct to?

Might be someone of Pylontech @Ned Yu (Pylontech) can assist, too?

I would be very happy and appreciate very much any idea and help. Perhaps somebody of the community or of Victron can direct me into the right direction where and how to investigate this problem.

DayAndNight

Hi @DayAndNight

Did you read out the batteries? what does your battery supplier say about this?

Hello!

I wanted to post an update for this. As the described alerts did show up again and again and in smaller intervals. By chance being on site when the alert happens, I could track the temperature alert to one specific device, because the red alert LED was ON.

I removed this device out of the parallel before eight devices and hoped that my alerts for low temperature and "internal" errors are gone with the remaining seven devices.

Unfortunately today the "internal error" showed up again. But not the "low-temperature alert". I asked my customer to look if there is a alert led lit! And it was. So I assume I have two defective Pylon batteries I have to sent back for warranty replacement.

I keep you informed!

DayAndNight

@DayAndNight I have the same problem here: internal failure alarms and low battery alarms. I have 8 batteries in the 15 kVA (3 x MP-II 5000) system. Do You have any idea how to detect which battery is defective?

Just came on here via google search as I now have the same problem. After about a week of internittent messages it has now resulted in one of my 4 USC 3000 batteries shutting down with the red light on. On the GX it was showing -10C as a temperature (despite it being 25 degrees here), so I guess a temperature sensor has failewd in that battery. Going to call my supplier in the first instance and see what they say. Seems to be a commoin fault!

Hello @MarkEss ,

in my case the faulty battery had a red led, which made it easy to identify it. I highly recommend to get a communication cable and the Pylontech software batteryview which makes it easy to locate the problem. And it does allow you to get an overview of all your batteries in one run.

Do you reach normally 100% SOC? How many batteries you have in the stack?

I am asking, because you have a warning of "Cell imbalance", too - this might be a sign that your batteries doesn't get enough time to balance, which may cause such a warning. As first step I would try to solve this.

Nevertheless, low temperature sound strange. I never got an explanation for this in my case.

Finally my battery was for reapir and came back with another problem. But in the end the battery was replaced by a new one within guarantee period.

Servus - DayAndNight - Ewald.

Hi @DayAndNight , thanks for the tip. I have 5x us3000c (17.5kWh). They regularly sit at 100% for hours this time of year. I did charge them independently, one after the other, a few months ago to balance them. Functionality seems fine and they are only 8 mths old, so not inclined to touch them. If it persists I can probe more as you recommend.

Hello had the exact same error, battery low temperature, but my battery has the red light on continously, 10x US5000C, checked cell temperature lowest is (-40 Celsuis) defínetly a sensor error, we are in Mexico, lets see if Pylontech warranty is as good as they claim.

@Alberto Fernandez @Fenics @MarkEss

I had the exact same issue. Upgraded the firmware to latest on all batteries in battery bank. Seems to have solved the problem.