Hi Nicky, thanks for this input in this post, however as a complete novice I have almost zero understanding of a lot of what technical points you are referring to regarding Pylontech batteries.
Fortunately though you mentioned situations where these batteries may experience
battery high voltage warnings. I have also had a Battery INTERNAL ERROR BATTERY warning.
I currently have this specific warning problem regularly each day.
I have a EasySolar Victron 48/5000, 15 roof mounted pv panels putting out a max of 5,5kw, and 4 Pylontech 3,5kw batteries charged by a external MPPT 250/100 charger.
I read that these warnings must be taken seriously obviously to prevent damage to my batteries and other system components, AND THEREFORE THE FAULT MUST BE RECTIFIED SOONEST!
Where would I start to look to rectify this problem.
Thanks in advance…
Patrick
Can you tell me how long is deemed normal for 4 x 3,5kw Pylontech batteries to stabilize after having a month ago increased my pv output of 3,3kw on a good day. (this was the output for 3,5 years), to 5,5kw as a best day result, and I also at the same time replaced the EasySolar builtin MPPT with an externally mounted 250/100 MPPT.
I am getting regular daily battery high voltage warnings and have also had a battery internal fault warning.
I read of the sensitivity of the batteries to max voltage, and my charge voltage doesn’t appear to go over 52.2v or 52.3v
Maybe you should do the opposite, as the Pylontech manual states and I quote: Condition: Cell voltage high. The module voltage is lower than 54V, SOC LED does not all on. When discharge the module protection disappear. Solution: Keep charge the module by 53-54V or keep the system cycle. The BMS can balance the cell during cycling.
Contact Pylontech customer service who will certainly ask you to send them the Logs and History of the battery that is causing these problems. But as many very short-lived High Voltages are known, so are INTERNAL ERROR BATTERY warnings, it is more serious. My advice is to contact Pylontech quickly and in the meantime remove this battery from your stack.
Thanks Alex, but I am having a hard time understanding your solutions.
The easiest seems to be… Keep System Cycle.
I am totally novice in Victron inverter especially “integral” settings.
I successfully managed my system general running and keeping batteries charged, via Eskom and Generator for over 3 years, and monitoring battery SOC, but I am afraid for other specialist settings I will need to be guided.
How do I go about Keep System Cycle checking or setting up?
@PKM-100 so if you have a GX, you have the information in the battery section, otherwise you need to contact Pylontech customer service (yes, 10-year warranty) who will let you download the software and the procedure to do these extractions directly in the US.
@Maa, I went into my GX in Battery section. All alarms and Warnings, all shows ok. Even Battery Internal Failure shows OK!
Only shows ALARM for the High Voltage Warning.
My battery STATE is 94%, and these 4 batteries have been in use here since 2020!
Battery overall history shows
Max 53.1v
Min 47,23v
Your thoughts on the above please
You need to add the custom VRM widget in advanced that will chart the BMS min/max cell voltages.
If these are new batteries, leave them on keep charged for a few days, they usually sort themselves out.
Alternatively you can try the beta GX software which is testing a new charge profile for Pylon batteries.
If this isn’t helping and the VRM widget is showing large difference between cells, then a support call to Pylon is the best course of action.
Make sure you haven’t manually set any limitations in DVCC either.
Hi @PKM-100
Did you had such errors before hardware upgrade?
If not, probably because you have a much greater charging current, the final ramp-up voltage is steeper and therefore the high voltage errors of some cells.
Having 4 x US3000C, it means you have 300A of batteries.
Try to limit the charging current on Settings - DVCC - Limit charge current to 60A and see if it happens again.
If still happens and you have enough patience, then try to monitor from the Pylontech - Details - Highest cell voltage, at the end of charging (>96% SOC) which is the cell with the maximum voltage and in which battery is it.
You have there, in front of the cell voltage, something like XXYY. YY is the battery number. Also remember the cell voltage and tell us.
With AUTO it should select the pylon, but you can click on that option and manually select pylon as the BMS.
There is no need to set a current limit, the BMS does this by itself.
In DVCC it should say it is forced on, so everything that should be on, will be on.
it’s only the limit charge current that has been added, which isn’t needed for managed batteries that regulate the current by themselves. It certainly won’t affect your HV issues.
Without seeing charts no one can say. Healthy batteries, properly charged and allowed to balance, that aren’t deeply discharged don’t usually see these issues.
If you have a bad cell you would need to monitor the variance in min/max voltage via the charts and try see if its the same cell via the BMS (which may need extra SW to do).
The VRM advanced widget is the place to start.
Alex, I didn’t have the HV warning problems before, and yes I upgraded the MPPT to accommodate the higher pv output, due to pv panel reconfiguration.
I actually only have 4 x US3000 Batteries not the “C” version!
I think I will monitor the individual battery performance, but I don’t have the custom vrm widget yet… How can I get it?
I assume all the battery numbers info is also only found in the custom vrm widget?
Go lookup the VRM manual, it has all the info to get you going.
It is added via an add widget icon on the VRM advanced tab.
Look for BMS in the list, available widgets will be listed underneath.
