^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

14 hours ago, BarneyB said:

^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

There are many topics about this. At times the manufacturer comes to the party after local guys did not want to honour a claim. 

Search for Pylon or look in the battery section. 

I have noticed that the top plate of my up5000 battery is'nt as flat as always. Could this be an indication of a swolen battery pack? Can I open it? Dont want to void the warranty

Edited September 30, 20241 yr by Warlok
Spelling!!!

On 2024/09/26 at 8:26 PM, BarneyB said:

^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

Yes, and we still have a problem with the supplier who has a lot of excuses for not processing our claim. One of the other suppliers did not even question me when I brought the Pylontechs back after four years. They just credit my account but the second one, a Chinese owner, cannot even find the serial numbers in his books. I had to provide him with the invoice and can still not find it. Not even Pylontech react to my e-mails. It leaves me with no other option than to start the legal process and get my money back.

Discovered a US2000B not wanting to charge and discharging quickly, looked in the cabinet and found this liitle problem....

This battery is 4 years old, and charged via LI setup on SPF5000ES from inception!!

On 2024/10/25 at 3:39 PM, andrewarnich said:

Discovered a US2000B not wanting to charge and discharging quickly, looked in the cabinet and found this liitle problem....

This battery is 4 years old, and charged via LI setup on SPF5000ES from inception!!

At what speed did you typically charge this puppy?

On 2024/09/26 at 7:26 PM, BarneyB said:

^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

Hi, 3 out 4 of my swollen batteries were removed on 06/11/24 by the firm that installed them. I have been constantly trying to get some sort of decision as they are 4 years into a 10 warranty. The 4th battery was installed approximately 2 years ago and is a different Pylontech model to the other 3 and is showing no problems as yet. I had to pay £180 to the firm that installed them just for the privilige of getting them removed for testing.

Further to my post of 2/12/24, have still not received a reply form the contractor to a number of e-mails sent to them. Have now sent 2 registered letters to the contractor threatening legal action, but this has still not spurred them on. Don't want to go down this road but it seems that this is going to be my only option.

On 2024/10/20 at 4:35 PM, Helgard Lombard said:

Yes, and we still have a problem with the supplier who has a lot of excuses for not processing our claim. One of the other suppliers did not even question me when I brought the Pylontechs back after four years. They just credit my account but the second one, a Chinese owner, cannot even find the serial numbers in his books. I had to provide him with the invoice and can still not find it. Not even Pylontech react to my e-mails. It leaves me with no other option than to start the legal process and get my money back.

 

On 2024/10/20 at 4:35 PM, Helgard Lombard said:

Yes, and we still have a problem with the supplier who has a lot of excuses for not processing our claim. One of the other suppliers did not even question me when I brought the Pylontechs back after four years. They just credit my account but the second one, a Chinese owner, cannot even find the serial numbers in his books. I had to provide him with the invoice and can still not find it. Not even Pylontech react to my e-mails. It leaves me with no other option than to start the legal process and get my money back.

 

I have now got Trading Standards involved as the contractor has stiil not been in contact with me. It would appear that the batteries have not been working correctly for a long time as the consumption figures below will show. We have not changed any of our daily consumption between the 2 years.

December 2023 (with 4 batteries) 855.45 KW/H.

December 2024 (with 1 battery) 491.66 KW/H.

Rather than save me money this installation has proved to be extremely expensive and I wish I had never had them installed. I would now be under a lot less stress and be financially better of by THOUSANDS of pounds. I have not yet named and shamed the contractor, but as I informed them earlier I will post their apathy to this situation on social media soon.

On 2024/09/26 at 8:26 PM, BarneyB said:

^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

Hi, We have had 3 warranty claims declined due to batteries swelling, these were all connected to Deye inverters and parameters were set according to battery manufacturer. Their excuse was that the batteries were over charged and discharged

we have also purchased a few pylontech batteries. we are in south africa. the supplier doesnt want to replace it though its under warranty. the battery is swollen.

On 2024/09/26 at 8:26 PM, BarneyB said:

^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

Good day,

As I have mentioned before, my UP5000 battery is swollen as well. It works fine from 100% SOC to about 60%, and the drops off very fast. Drawing about 200-300 watts it drops from 60 to 30% in about 30 minutes. Battery is less than 3 years old with less than 900 cycles. I have never drawn more than 1.5kw out of the battery.

The battery was connected to a Axpert inverter for 2 years and I had the voltage set to 52,5V, and never had any problems. (no swelling and good runtime)

I "upgraded" to a Sunsynk 5kw inverter, connected a raspberry Pi with Solar assistant, got all the right cables for BMS monitoring and all worked like a charm.

Obviously the BMS took over the charging of the battery, but I was not pleased with it going up to 53,5v. I tried setting it back to 52,5v as this was recommended by a few people on Powerforum. ( 52,5v x 15 cells =3.5v per cell).

The Pylontech BMS took the cell voltage up to 3.9v, and I had no control over it. Now 3.9v x 16 = 58.5v. This in my opinion is way to high.

Correct me if I'm wrong, but I think this is the reason for the battery failing.

I've read about people saying that Pylontech do not honor the warranty if the batteries are swollen, because the user have "overcharged" the battery. But, how is this possible if the BMS takes over control?.

I really can not afford to just go and buy a new battery, and I can not afford to remove the battery, as I'm living on a plot where Eskom power is VERY unreliable.

I contacted the supplier which I bought the battery from, and they told me I MUST bring in the battery. What he needs to do is send it away and have it tested to see if I "overcharged" the battery. Now, obviously this is what they will say, as I think the battery is being overcharged, but due to the BMS.

I can not afford to remove the battery as we get on average 10-15 power failures/dips a day. I know if the battery fails completely, it will most probably burn my house down. But then this will be a case between me, my insurer and Pylontech. (and an attorney).

Does anybody have a solution to this, which does not involve me just running the inverter from solar without the battery? Maybe get the supplier to loan me a small battery just fro a "buffer" when the power goes out? I know this is asking much, but I really do not know what to do.

Thank you to all who have helped me through the years on the Powerforum.

@Warlok Segen is going to say your battery was over charged at one point. They are looking for that one time when you got over 54v and warranty will be rejected. Even if you went over 54v three years ago and the battery worked fine till now and voltages never went over 53v and you suddenly notice the swelling now and change in performance, they are still going to point to that 54v charge you had before :-)

8 hours ago, Warlok said:

Obviously the BMS took over the charging of the battery, but I was not pleased with it going up to 53,5v. I tried setting it back to 52,5v as this was recommended by a few people on Powerforum. ( 52,5v x 15 cells =3.5v per cell).

The Pylontech BMS took the cell voltage up to 3.9v, and I had no control over it. Now 3.9v x 16 = 58.5v. This in my opinion is way to high.

There is nothing wrong with using BMS comms and going to 53,5v . Been doing it for 5 years , over 10MW discharged at 93% SOH currently .

What was the highest pack voltage that you saw ? seeing one or two cells at 3.9V would be possible under specific conditions but for the entire pack to be at 58,5 would be very unlikely as the BMS would have to request that charge voltage which it would never do with comms . What i suspect happened is that when you were using the lower charge voltage on the Axpert for those 2 years the individual cells were not hitting the top end of the charge curve thus they were not balancing properly , over time this caused great imbalance. Then when you connected the comms and the higher charge voltage was requested some individual cells hit 3,9 as the pylons really suck at balancing the cells if they are severely imbalanced. Post the batteries cycle history/log files here if you can.

On 2026/01/21 at 4:23 PM, Nexuss said:

as the pylons really suck at balancing the cells

Good day,

A quick search on pylontech swollen batteries and only on facebook marketplace.

All the cases of swollen batteries need to be looked at properly. If a battery is subject to excessive voltage it is not surprising if the battery suffers swelling. If the battery is requesting 53.2v but the inverter isn't and is supplying more then should the battery manufacturer replace it under warranty? In many cases it appears it is an inverter problem.

If I had that problem and was wanting a warranty replacement then I would approach it two ways.

1 try to claim new batteries from the inverter manufacture due to failure of the inverters voltage control.

2 Claim from Pylontech because of their bms's inability to physically protect the cells from overvoltage.

Regarding cell balancing I've never experienced any problems with cells going out of balance, and I don't think you would in a well designed/ specked system.

I have this problem. Not as scary swollen as some of the pictures, but the casing is definitely no longer flat, and recently it wasn't charging, and was giving errors. I haven't taken the battery to the supplier yet, but was wondering the process.

Summary : do not support Pylontech

Their service levels are poor to non existent.

My setup has 4x Pylontechs us3000b.

The batteries are sending a high voltage alarm to the victron. I made contact with pylon tech. They sent solar deity. I paid upfront for a call out and health assessment.

28 April, The technicians came to my home. Downloaded log files and left.

Since both pylon tech and its rep has been in responsive. I had to log multiple calls to get the assessment report. When I finally get the reports, it looks like a template with a copy paste of my battery details. They claim that the batteries are swollen. However, the technicians didn’t even inspect the batteries.

Will not recommend pylon tech to anyone ever again.

On 2024/09/26 at 8:26 PM, BarneyB said:

^^Swollen Pylontech Batteries^^
If there is anyone that experienced swollen Pylontech batteries where the distributor / importer / contractor doesn’t want to honor the warrantee please make contact with me … we are working on a very important case …. Thx u

Good day

I’m experiencing difficulties with Pylontech SA and its appointed representative.

16 hours ago, midnightcaller said:

Good day

I’m experiencing difficulties with Pylontech SA and its appointed representative.

Thanks for the heads-up everyone. Even though it might not resolve your problems, take heart that your warnings are heard - I for one will certainly not buy a Pylontech battery, or do business with their South African importers...

Stand strong - perhaps a class action might convince them to honor their warranty rather than hide behind small print...

Hi, Solar Deity has taken over the service for SA, if you have any problems, you are welcome to contact directly.

https://solardeity.co.za/pylontech-servicesupport/

Edited 5 hours ago5 hr by Lumo Energy

55 minutes ago, Lumo Energy said:

Hi, Solar Deity has taken over the service for SA, if you have any problems, you are welcome to contact directly.

Can you please confirm if Solar Deity is the sole (only) agent for Pylontech in South Africa, or are there other agents also importing and/or supplying Pylontech products into the South Africa market (Supplying, not just servicing...)?