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Significance of BMS warrantees on Pylontech, Revov and Sunsynk batteries


Ted Moss

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I really would appreciate some guidance on this issue, that I have not seen aired on the forum.

I have committed to a smallish/medium home solar system comprising a 5kW Sunsynk inverter and 10X Jinko 475W Type N panels, sourcing from a local shop that deals directly with large suppliers such as Segen Solar. Regarding batteries I recognise that I need an approximate capacity of 10kWh. My initial considerations were as follows:

2X Revov R100;

2X Sunsynk 5.32kWh; and

3X PylonTech US3000C.

Initially I was keen on the Revovs because of their attractive pricing and good reputation, while my local supplier vouched very strongly for the PylonTechs (most pricey) that he said were trouble-free in his experience. I then started looking at the respective warranties, noting that all 3 have an effective 10 year cell warranty. However the BMS is something else, with Revov being 2 years, Sunsynk 5 years and (apparently) the PylonTech being the full 10 years. Of course, combining Sunsynk batteries with the Sunsynk inverter extends the warranty of the latter to 10 years, albeit in a limited way.

I have a question in principle that I would be grateful to have answered:

Fairly clearly, during that period where the cells plus BMS are covered, the failure of either would lead to a valid warranty claim. However, even a single day beyond the BMS warranty, what is likely to happen in the event of a BMS failure..? Because the purpose of the BMS is to protect the battery against adverse conditions, it is possible that the battery cells might consequently fail, especially if one is not vigilant. In this case, would the supplier reject both the BMS and the cell claim, because the former (no longer under warranty) fault caused the latter failure? Also, does the shorter warranty on the Revov and Sunsynk BMSs imply that these are more vulnerable than the cells themselves..?

The above logic, if true, points towards the PylonTech being a good choice; however I have been put off by posts where Segen Solar has turned down warranty claims on these batteries for over-voltage, etc, despite the role of the BMS being to obviate such events.

Apologies if this is a bit long-winded or duplicates what has been resolved before, but I would really appreciate informed opinions on this matter.

 

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Hi Ted

Given your setup I see you want to implement - ask your supplier if they offer are aware of if you have or are purchasing a Sunsynk inverter and add a Sunsynk battery that your Sunsynk inverter which should carry a 5yr warranty will be extended to 10 yrs with a Sunsynk battery - you do mention it but I found some suppliers/installers who don't know about it or even deny its an option.

Personally wouldn't look at Revov - second life battery options is SA is like asking the corner spares shop to service your McLaren super car - overseas I'd seriously consider second-life batteries - these normally come from electric vehicle manufacturers - but sorry not here. Last I checked which was 2 days ago, Revov only have a 2-3 yr warranties and I've already spotted I think complaints in this forum or another about support - the R200 model says 10 yrs but only 3500 cycles - I have 10kw of storage installed and 2-3 sometimes 4 times a week I go through at least 2 cycles - is more like a 5yr warranty. Basically Revov info changes constantly, they're always having "flash sales" and I find the info contradictory at times, so for me not an option worth looking at.

PylonTech have been around for ever and are generally a safe choice (not sure about the 10 yr warranty they have always been 5yrs) but I personally find their tech to be a bit long in the tooth now though that isn't necessarily a bad thing. I would look at something a little more modern, that being said you can read my post here and if you don't want to trawl trough my lengthy lengthy rant about BMS's, bad batteries and such at the end of the post I have some options that I'm personally looking at / asking advice on to switch form the god-awful-dreadful-do-not-touch-with-a-barge-poll-CFE-5100s and by association (unfortunately) Raytech batteries (they are rebranded CFE batteries).

You do though seem to understand the importance of a legitimate, well programed and reliable BMS and that should be the most import thing to look at.

So ignore the rest of my waffles below but it might be helpful - to answer you main question - A BMS Failure is pretty serious - depending on how you deal with it - you could potentially circumvent most of the BMS problem by running your inverter in Voltage Monitoring mode (are known as playing with Fire Mode) where you set Float, Balance, Absorption, Cut off, Low Voltage etc. manually and that might get you another 3-6 maybe twelve months of relatively trouble free use (It could also if you get wrong cause a fire)- however - one of the functions that are being more tightly integrated in to the BMS's is over/under voltage and over current protection, some batteries used to hand this off to separate "daughter boards" so if something failed you could say replace the faulty over voltage protection, or temperature monitoring board/circuit and be fine - In almost all lifepo4 batteries in the last 2-3 years they are of the more tightly integrated type, and these days considered a mandatory component in LiFePO4 and while there are legitimate reasons to do this in one integrated circuit/logicboard, it's mostly a cost saving for the manufacturer - besides being the brains of keeping a battery healthy the really good ones measure individual cells and their voltage, current temperature etc. and in really fancy systems (mostly bespoke) they can even disconnect faulty cells individually and compensate the entire batteries behavior's until the faulty cell is replaced  - call it the "unfortunate cost of progress" - 

Personally if you have the money to invest in batteries and good ones I'd research LG Chem. but so far I've only found SegenSolar  so far as a possible supplier and they don't answer me emails or phone calls so - they also seem to be arseholes when it comes to warranties - take that for what its worth. a 16kw LG Chem fully imported will set out back about R200k without taxes but you'd be buying one of if not the best battery packs available at over the last 2 yrs, you do though need a professional install with someone who is a LG Chem Certified installer.

At the moment I have very genuine concerns about the vast array of batteries that only keep growing each day in SA which I see in threads users are having similar issues with - I've seen various users say SOC accuracy is not that big a deal and they all have interesting explanations around that but to me they mostly point to poorly designed BMS systems and even more so badly programmed firmware for said BMS - I joke/not joke about having a chemical Fire extinguisher handy but in all seriousness until you've dealt with a chemical fire especially a lithium battery fire - I wish people would take this a little more seriously - I expect (how cocky of me) you to add a largish dry powder/CO2 or chemical Fire Extinguisher to your shopping list 4.5-9kg - (Lithium-ion battery fires are Class B fires, indicating the presence of flammable liquids, so a standard dry chemical or ABC extinguisher can put them out but if you're a little more of a "better safe than sorry" type - I'd recommend a Class D fire extinguisher) they're not that expensive - just do it.

The bottom line is all systems have problems and even the best of the best components will sometimes fail. For me it was who I chose as my supplier and why I now have a way to replace my 2 CFE 5.12kw batteries without much fan fare from them - I'm was not interested in installers and their stories, I bought all my components on my own and then had a very competent electrician who has done many, many installs including large business scale ones to do my install for me.

I would suggest if budget allows to look at a different solar array setup - i'm personally holding out for 675w QCell panels possibly bi-facial panels to commission an 8.1kw Array - they do cost more, they are physically larger than your Jinko's you've specced (and that might very well be due to a space requirement you have to work within) but I would try and maximise production as much as you can allow for now so that Grid reliance is at a minimum - for me, my planned route is loosely referred to as "Islanding" (where you essentially become your own utility) there are many factors to consider and it is considered by most an off-grid solution - I also already have a genset and stored fuel reserves etc. and the switching and automation logic embedded to basically produce my own power no mater the weather or other anomalies - I have water dependencies, filtration and water storage that all form part of that as well and is beyond the scope of this discussion but I'd think about your solar array size if it is an option for you.

And you where worried your post might be long winded 🤣

Shout if i can provide more info...

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1 hour ago, TheMafiaMan - NotMuffinMan said:

Hi Ted

Given your setup I see you want to implement - ask your supplier if they offer are aware of if you have or are purchasing a Sunsynk inverter and add a Sunsynk battery that your Sunsynk inverter which should carry a 5yr warranty will be extended to 10 yrs with a Sunsynk battery - you do mention it but I found some suppliers/installers who don't know about it or even deny its an option.

Personally wouldn't look at Revov - second life battery options is SA is like asking the corner spares shop to service your McLaren super car - overseas I'd seriously consider second-life batteries - these normally come from electric vehicle manufacturers - but sorry not here. Last I checked which was 2 days ago, Revov only have a 2-3 yr warranties and I've already spotted I think complaints in this forum or another about support - the R200 model says 10 yrs but only 3500 cycles - I have 10kw of storage installed and 2-3 sometimes 4 times a week I go through at least 2 cycles - is more like a 5yr warranty. Basically Revov info changes constantly, they're always having "flash sales" and I find the info contradictory at times, so for me not an option worth looking at.

PylonTech have been around for ever and are generally a safe choice (not sure about the 10 yr warranty they have always been 5yrs) but I personally find their tech to be a bit long in the tooth now though that isn't necessarily a bad thing. I would look at something a little more modern, that being said you can read my post here and if you don't want to trawl trough my lengthy lengthy rant about BMS's, bad batteries and such at the end of the post I have some options that I'm personally looking at / asking advice on to switch form the god-awful-dreadful-do-not-touch-with-a-barge-poll-CFE-5100s and by association (unfortunately) Raytech batteries (they are rebranded CFE batteries).

You do though seem to understand the importance of a legitimate, well programed and reliable BMS and that should be the most import thing to look at.

So ignore the rest of my waffles below but it might be helpful - to answer you main question - A BMS Failure is pretty serious - depending on how you deal with it - you could potentially circumvent most of the BMS problem by running your inverter in Voltage Monitoring mode (are known as playing with Fire Mode) where you set Float, Balance, Absorption, Cut off, Low Voltage etc. manually and that might get you another 3-6 maybe twelve months of relatively trouble free use (It could also if you get wrong cause a fire)- however - one of the functions that are being more tightly integrated in to the BMS's is over/under voltage and over current protection, some batteries used to hand this off to separate "daughter boards" so if something failed you could say replace the faulty over voltage protection, or temperature monitoring board/circuit and be fine - In almost all lifepo4 batteries in the last 2-3 years they are of the more tightly integrated type, and these days considered a mandatory component in LiFePO4 and while there are legitimate reasons to do this in one integrated circuit/logicboard, it's mostly a cost saving for the manufacturer - besides being the brains of keeping a battery healthy the really good ones measure individual cells and their voltage, current temperature etc. and in really fancy systems (mostly bespoke) they can even disconnect faulty cells individually and compensate the entire batteries behavior's until the faulty cell is replaced  - call it the "unfortunate cost of progress" - 

Personally if you have the money to invest in batteries and good ones I'd research LG Chem. but so far I've only found SegenSolar  so far as a possible supplier and they don't answer me emails or phone calls so - they also seem to be arseholes when it comes to warranties - take that for what its worth. a 16kw LG Chem fully imported will set out back about R200k without taxes but you'd be buying one of if not the best battery packs available at over the last 2 yrs, you do though need a professional install with someone who is a LG Chem Certified installer.

At the moment I have very genuine concerns about the vast array of batteries that only keep growing each day in SA which I see in threads users are having similar issues with - I've seen various users say SOC accuracy is not that big a deal and they all have interesting explanations around that but to me they mostly point to poorly designed BMS systems and even more so badly programmed firmware for said BMS - I joke/not joke about having a chemical Fire extinguisher handy but in all seriousness until you've dealt with a chemical fire especially a lithium battery fire - I wish people would take this a little more seriously - I expect (how cocky of me) you to add a largish dry powder/CO2 or chemical Fire Extinguisher to your shopping list 4.5-9kg - (Lithium-ion battery fires are Class B fires, indicating the presence of flammable liquids, so a standard dry chemical or ABC extinguisher can put them out but if you're a little more of a "better safe than sorry" type - I'd recommend a Class D fire extinguisher) they're not that expensive - just do it.

The bottom line is all systems have problems and even the best of the best components will sometimes fail. For me it was who I chose as my supplier and why I now have a way to replace my 2 CFE 5.12kw batteries without much fan fare from them - I'm was not interested in installers and their stories, I bought all my components on my own and then had a very competent electrician who has done many, many installs including large business scale ones to do my install for me.

I would suggest if budget allows to look at a different solar array setup - i'm personally holding out for 675w QCell panels possibly bi-facial panels to commission an 8.1kw Array - they do cost more, they are physically larger than your Jinko's you've specced (and that might very well be due to a space requirement you have to work within) but I would try and maximise production as much as you can allow for now so that Grid reliance is at a minimum - for me, my planned route is loosely referred to as "Islanding" (where you essentially become your own utility) there are many factors to consider and it is considered by most an off-grid solution - I also already have a genset and stored fuel reserves etc. and the switching and automation logic embedded to basically produce my own power no mater the weather or other anomalies - I have water dependencies, filtration and water storage that all form part of that as well and is beyond the scope of this discussion but I'd think about your solar array size if it is an option for you.

And you where worried your post might be long winded 🤣

Shout if i can provide more info...

Hi TheMafiaMan

Many thanks for the comprehensive and nuanced response. 

Have you seen the Australian testing conducted in the link below? I found it fascinating that at that time, a PylonTech battery was only one of two (out of 26) that performed according to its published expectations.

https://www.solarquotes.com.au/blog/battery-testing-final-report/#

However, I would still like the fundamental question to be answered regarding the possible failure of the BMS occurring outside its warranty period and causing cell failure. I am particularly interested in the Sunsynk 5.32kWh within this context.

Regards, Ted.

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Hey Ted

There are third party BMS solutions that can be had like the JK JBB and Victron have the Victron Lynx Smart BMS 500 which they say is only for Victron Lithium Smart batteries but I have seen one used on other batteries will try find the Youtube video - its a bit odd - then there is options from LBSA but it seems they might be closing out on selling them - they have/had a 100A 15/16s 48v LiFePO4 Smart BMS with a display you could possibly use on the Sunsynk once the warranty was up and say the BMS failed but where a warranty implies that the BMS and Cells are warrantied separately under various conditions, its safe to assume (and I hate assuming) that they will only part warranty the half that isn't faulty if they replace/repair the faulty part as Sunsynk themselves - i.e. an agent sanctioned repair. 

My understanding of that is that you would have 1 yrs coverage on the part that has been replaced/repaired.

Let me know if I'm better understanding your question - though again, given you have a DEYE inverted and the price you where quoted I'd still recommend going for the DEYE battery unless you have some interesting info you can share? - DEYE are Sunsynks Manufacturer.

As for the Pylontech Batteries, yes I've read this test report before but if you haven't visited this evolving thread I'd go read most of it - not looking good for Pylontech here in SA, even just at face value - I don't agree with their testing methodology completely with the accelerated testing to equate to 5/10years use - Li chemistry will almost always perform poorly in forced heavy and environmental lab sims and its not inline with the more 'considered' moderate load model that takes unfortunately much longer to run and is more representative of how they will be used by and large in the field. If I was a for example a mobile network (cellular) operator or heavy industry potential user then their data is of more interest.

There are specialist HV systems mostly out of the UK, Germany and the Nordic regions which are very specialised and mostly custom built - non the less its a very interesting read

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6 hours ago, Ted Moss said:

Hi MafiaMan

Yes, I had seen this worrying thread on PylonTech - so maybe one should go for Sunsynk, despite the 5 year limitation on the BMS..? Possibly their BMSs are very reliable in any event?

Regards

Ted

Regarding that thread I think their is a lot of information missing. The logs are only for this year and they do clearly show that the battery has been subjected to over voltages and not just spikes. We can't see if this has also occurred during the previous years. Something has clearly gone wrong with the voltage control. The max voltage looks to be about 54v which is above the max in the spec for the battery of 53.5v. It seems that the Pylontech BMS does a permanent (physical) shut off of over 55v which this setup hasn't reached. I'm not sure what the BMS actually does between these settings other than CAN messages to the inverter.

If you search on here you will also find treads showing repairs to Pylontech BMS's because they have done their job of protecting the batteries.

In my set up the max the BMS has ever requested is 53.2v and it also sends max current settings to the inverter which taper down as the SOC increases or it could even be related to voltage. In the thread referenced it looks as if the inverter isn't responding to these settings. I can quite understand why the warranty claim has been rejected but if they could prove that the BMS had failed to send the settings to the inverter that would be a different matter.

Edited by Tinbum
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14 hours ago, Ted Moss said:

In any event, is it true that the Sunsynk is 16s vs 15s of the PylonTech..? (Apologies if I am looking at this matter in quite a limited scope relative to your broad knowledge.)

I know for a fact my CFE 5.12kw units are 16s as I can see and monitor the voltage for each cell in the pack with their separate BMS App - there seems to be 2 different 5kw Sunsynk packs a 5.12kw which is 16s and a 5.32kw which I cannot find the cell count on - They do both look quite different the 5.12kw unit is a rackmount type black unit (maybe an older model??) the 5.32kw is a wall mount white unit with a status bar on the front -  assuming which I hate doing I would imagine the later is also a 16s else it might be a stacked wafer style? The data sheet for it doesn't specify this - I'll see what I can find and post it here for you.

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@Tinbum while I don't disagree or necessarily agree - the over arching issue(s) I have are:

  1. The sheer amount of hoop jumping people are to going through to get warranty support and not just on PylonTech products
  2. SegenSolar are building up a reputation for being unhelpful and and in some instances quite condescending - And to be fair and balanced to them other suppliers alike tend to treat everyone like idiots - with the kind of money being spent - giving you the time of day and listening to your clients problems and not dismissing them at the first opportunity they can find is a minimum requirement in my experience - at the very least
  3. Most (and yes that is a poor generalization I concede) inverters when running in BMS battery mode (DEYE is my reference in this case) strictly follow the BMS instructions/data being fed to them - while an argument can be made for how long the inverter takes to respond - my personal experience and sample of one I concede, is 20ms or less - but where do you draw the line? Go and look online at the many in this case Pylontech - and sorry I'm singling them out but they are the focus of peoples ire here - that after 3-5 yrs are swelling as an example or many users anecdotal evidence that if they peruse the logs, report seeing a voltage spike at least at some time especially during the commissioning state - that Pylontech would characterise as out of spec and therefore the "no warranty for you" attitude. - Do we then assume (and as I now have said numerous times I hate assuming) that most inverters are rubbish at reacting to comms signals ? Sorry I don't buy that.

Yes you are correct that there are threads of BMS repairs reflecting that the BMS did its job but there are also many instances of the BMS clearly not doing its Job and "official" replies from Pylontech containing words like Passive BMS etc. - It does if you stand back from it all smack just a little of arse covering - and yes that is my opinion - so people are completely welcome to agree or disagree with that.

I've stated in other posts that Pylontech are generally seen as a good stable/safe choice, but I've also stated that I think think their tech is a bit long in the tooth now and like all things we need to see progress in the battery space at a much quicker rate - look what Sunsynk and DEYE are doing battery wise in the HV space with really sophisticated monitoring and multiple layers of programmatic safety systems in the batteries and management hubs.

I don't support chasing inverter, battery and solar tech down to the cheapest dollar or Rand amount in our case, that almost always bites you in the end, but I'd like to believe - naively maybe - that most people are investing money they've had saved many times for other maybe more important things, or borrow where they possible shouldn't but there is a fevered rush to basically provide our own power because our government has failed us.

In many instances it's everyman for himself and opportunistic action from suppliers, importers and manufactures who use warranties like their own personal magic wand deciding on your fate at their behest - needs to be brought to light and stamped out if we're to have a robust alternative energy industry where every second to third person is being ripped off.

In that instance - I'd level the same ire at a DEYE, Victron, Canadian Solar, Pylontech, LG Chem etc. etc.

My 5 cents worth.

Edited by TheMafiaMan - NotMuffinMan
typos
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8 hours ago, TheMafiaMan - NotMuffinMan said:

@Tinbum while I don't disagree or necessarily agree - the over arching issue(s) I have are:

  1. The sheer amount of hoop jumping people are to going through to get warranty support and not just on PylonTech products
  2. SegenSolar are building up a reputation for being unhelpful and and in some instances quite condescending - And to be fair and balanced to them other suppliers alike tend to treat everyone like idiots - with the kind of money being spent - giving you the time of day and listening to your clients problems and not dismissing them at the first opportunity they can find is a minimum requirement in my experience - at the very least
  3. Most (and yes that is a poor generalization I concede) inverters when running in BMS battery mode (DEYE is my reference in this case) strictly follow the BMS instructions/data being fed to them - while an argument can be made for how long the inverter takes to respond - my personal experience and sample of one I concede, is 20ms or less - but where do you draw the line? Go and look online at the many in this case Pylontech - and sorry I'm singling them out but they are the focus of peoples ire here - that after 3-5 yrs are swelling as an example or many users anecdotal evidence that if they peruse the logs, report seeing a voltage spike at least at some time especially during the commissioning state - that Pylontech would characterise as out of spec and therefore the "no warranty for you" attitude. - Do we then assume (and as I now have said numerous times I hate assuming) that most inverters are rubbish at reacting to comms signals ? Sorry I don't buy that.

Yes you are correct that there are threads of BMS repairs reflecting that the BMS did its job but there are also many instances of the BMS clearly not doing its Job and "official" replies from Pylontech containing words like Passive BMS etc. - It does if you stand back from it all smack just a little of arse covering - and yes that is my opinion - so people are completely welcome to agree or disagree with that.

I've stated in other posts that Pylontech are generally seen as a good stable/safe choice, but I've also stated that I think think their tech is a bit long in the tooth now and like all things we need to see progress in the battery space at a much quicker rate - look what Sunsynk and DEYE are doing battery wise in the HV space with really sophisticated monitoring and multiple layers of programmatic safety systems in the batteries and management hubs.

I don't support chasing inverter, battery and solar tech down to the cheapest dollar or Rand amount in our case, that almost always bites you in the end, but I'd like to believe - naively maybe - that most people are investing money they've had saved for other many times other things, or borrow where they possible shouldn't but there is a fevered rush to basically provide our own power because our government has failed us.

In many instances it's everyman for himself and opportunistic action from suppliers, importers and manufactures who use warranties like their own personal magic wand deciding on your fate at their behest - needs to brought to light and stamped out if we're to have a robust alternative energy industry where every second to third person is being ripped off.

In that instance - I'd level the same ire at a DEYE, Victron, Canadian Solar, Pylontech, LG Chem etc. etc.

My 5 cents worth.

I totally agree it can be very hard re warranties, but their are 2 sides to every story. The thread we are talking about, as I said, really doesn't give enough information. The logs don't go back far enough. The problem is their from day one, of the logs shown. We can see over voltage of the pack, over voltage of individual cells, under voltage of individual cells and the SOC (0%) well below what the battery was designed for (minimum of 20% when originally sold). I don't think it's for the cell voltages that Pylontech have rejected it for, it's the overall over voltage of the pack. The pack shouldn't be reaching those voltages if the CAN is connected and working. The logs show this over voltage is not just spikes it is constant, their is a failure somewhere and it's been going on for a while, how long, we don't know as we can't see the logs. I suspect it's only the eventual failure of a cell that shows the system hasn't been working from the start. It could be said that 54v isn't really over voltage for LiPo cells but it is over voltage for the Pylontech as they designed it and it shouldn't have exceeded what the BMS asks for. (I only have C batteries so perhaps someone could confirm what  the max voltage they have seen the BMS request on the non C batteries).

Re the passive BMS this is a reference to the balancing mechanism which can either be 'passive' or 'active' it's not a reference to the protection features. Pylontech have obviously had problems with over voltage on their batteries hence the notice I attached in the other tread. When I bought mine I remember seeing clear warning messages about the initial set up and making sure the batteries didn't go over voltage. These are not like Lead acid which are forgiving.

Re being outdated. This tech is changing at a very fast pace and for the likes of HV the potential dangers are much higher and it's a much newer development. Lithium batteries have only just become common over the last few years in the settings they are now being deployed in.

I agree it is every man / woman / person for themselves. I do think their are a lot of installers, including professional ones, that really don't know what they are doing. I had a professional PV install back in 2012 and it's been an absolute nightmare.  It's been removed from the roof twice and refitted and even then they couldn't do it right, they really didn't have a clue. It's frightening when they come out with comments like 'we've always done it that way'. In the end I suggested and accepted a cash payment from the insurance company to sort it out myself. Another example is we can see installs where only one battery pack has been installed that clearly won't be up to the job, but they will still sell them and install them.

I fell out with Segen (UK) myself when I bought batteries from them. They made a mistake over shipment, corrected it but then refused to give me the discount I was entitled to. They just weren't bothered so I said I'd never use them again and I haven't. It actually worked better for me, as the next supplier I used gave me even better prices than Segen had.

Edited by Tinbum
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On 2023/06/17 at 7:51 PM, Tinbum said:

Re the passive BMS this is a reference to the balancing mechanism which can either be 'passive' or 'active' it's not a reference to the protection features.

c) High Voltage: If charging voltage above 54V, battery protection will turn on.
Solution: Check whether voltage is too high or not, if it is, to change the settings on power supply
side.

That is right in the Pylontech US2000 Battery Manual on page 22 out of 23 in mine.

Pylontech's response to me was in fact in relation to the protection features reference above. To me the fact a error occurred and the system just resets itself is a major problem. How is a user going to know the problem has occurred to correct the settings in the system? Passive vs Active BMS on cell balancing i don't give a rats ass about as that is not protection that is balancing. But when protection is required then all BMS's should be Active. This is the only way to make a situation change from unsafe to safe and make the user aware that something needs to be checked out. If the BMS is Passive in regards to the protection than Pylontech should be honoring there warranties where over voltage has occurred due to misleading information.

Maybe the clear warnings you remember seeing was added by your supplier but there is nothing that really stands out in any of the documentation i have from any of my batteries (2 V1.1, 2 V2.4 and 1 V3.4)

End of the day with all the regulations and standards quoted in the world it is simply to easy for all these companies to side step them.

I will never buy another Pylontech product. This creates a problem for me as i had planned on doubling my bank in the coming 2 years and now i will have to look at replacing them instead.

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