Inaccurate SOC calculation of the Seplos BMS V3. Here is what I found...
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- čas přidán 3. 04. 2024
- This morning, the battery was fairly low in SOC and I thought, lets discharge it all the way and see what happens with the SOC calculation at this low state of charge.
Well, what I found just confirmed my suspicion I had for a while: the accurate calculation stops at certain point at low and high SOC, while the battery keeps charging and discharging. Therefore, the BMS drifts away from the real SOC of the battery. That is not great and I'm not sure if this is intentional built into the firmware of the BMS or if it is a bug.
There is also something more, I want to show you while the Seplos BMS is connected to the Victron system...
Seplos BMS V3.0 first look, test and review:
• Waiting for the SEPLOS...
Seplos Polo batteries, new features but are they good?
• Seplos Polo: This batt...
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That energy card looks really nice! Love to see more of it.
Home Assistant Energy feature :)
Would like to know which energy card that is. I would assume a HACS card.
Hi Andy,
I noticed strange fluctuating voice audio volume.
Mabe a setting in your GoPro will fix this.
Just wanted to let you know.
I always enjoy your great videos.
No problem with the JK Inverter bms. Shows the correct values solar and consumption.
Keep up the good work!👍🏼
Thanks! 👍
Thanks Andy, Would love to see more on the energy card.
Thanks, Wayne.
11:50 I suspect Seplos uses Voltage Levels to trigger the >98.5% and
The Energy card looks nice! Hope to see more of it.
That's why I would always add a Smart Shunt to a Victron System.
But not with a smart BMS which communicates with the inverter/Venus.
@Andi das ist was ich weiss , es hat probleme gegeben mit der kalkulation und dem Abgleich des SOC im vergleich zur batteriespannung , den abgleich braucht es wann du mehrere Batterien zusammen schliesst und so extrem wenig strom verbrauchst daß es das BMS gar nicht mitbekommt daß du eine entladung hast , da wurde der SOC nicht neu berechnet
original Message from Seplos 4.3.2024 über whatsapp
Our SOC algorithm is like this
When charging and discharging, the current integral system is used for calculation, and the voltage calibration point is finally added.
When the battery low voltage alarm occurs, the SOC is calibrated to 6%. When the battery high voltage alarm occurs, the SOC is calibrated to 98%.
After version 0.6, we adjusted the current threshold of bms to 0.5A, and the internal SOC calculation was placed above 0.2A.
Version 0.7 is We found that there is a problem with the accumulation algorithm of SOC and repaired the SOC current integral accumulation algorithm.
Thanks for sharing. It seems like there are still issues with the software. Hope they can fix it at soem stage.
@@OffGridGarageAustraliayes, programmers always have problems unless they are or have good testers of their software.
CZcams and its moderators are the best tool for companies that save on testers.
we made the BMS Great :-) ... or better *grrr
Thanks for your persistence!
Andy that 1 in the 81000 sign is obsolete, you need to print a 4 and wait 2 or 3 days to put it. Congratulations! love your channel
I am VERY interested if you went deeper on your HA - Victron integration and how to configure/use it.
Hi, great video!, with recent update the Power Flow Card Plus Card that is use on HA kind of broke, so looking forward for your video showing that card!
Reset the 6 percent as 0% …then fully charge and when full calibrate as to 100% …
Then do a capacity check and drain it to O again then back up to 100% ..and count the total amps…down and up…
This happened to me last fall and has been very accurate since I reset things…
Great stuff Andy.
thanks for finding out, shocking bad from Seplos (I have 2 of them) Keep up the good work.
I hope they can fix it. The BMS is good, the software needs some work.
@@OffGridGarageAustralia Have NeeY 4A balancer added to my two Seplos sets, happy with how good they balance the set.
Good afternoon
I am writing to you from Spain, thank you for sharing your knowledge. I have a question, what components would you put in a battery for your home such as BMS, cells, baleceardor to make the best possible battery??? thank you and greetings.
Andy, I corrected your sentence at 23:35 for accuracy when you said " I have to do this in a controlled environment, when I expect this to happen" to what you really meant to say which is... "I really have to do this when my wife is away because we all know what will happen"
Nah, she can be home, no problem. If the system is off, it usually is only for a few sec. Unfortunate if you just wash your hands or use water at the house and all of the sudden the pump stops😄
I should not do these tests with my production system. That's what the PowerWall 2.0 was built for. But soon, we will have something better....
Andy, you keep coming back,mate. Next week, the magic starts to happen here.
0.7 seems to have solved the soc issues for me. Previously had the same issue of the soc sitting at 98.5% for anything up to 2 hours at full charge but it's now going from 96% to 99% within 5 minutes with the charge dropping off to 10amps at 99% then hitting 100% after about an hour. It also seems to have fixed the issue where the soc would suddenly drop about 30% or more even with a tiny load of just 0.3kw. I only have one 280ah pack for now and charge at 57.6v.
It makes perfect sense to slow down charging at the top. If you had an unbalanced cell, it would later go over the limit with slower charging.
If you have an unbalanced cell, deal with it and top balance the battery. But don't slow down charging altogether.
@@OffGridGarageAustraliayeah always all amps coming down from heaven 😂
what i have noticed with seplos type bms in the shoto battery i have is , the same way the bms doesn't see the battery as charging under 1A
any time the solar/load causes the battetry to be in that slow charge without registering area the soc is unchanged as it isn't charging , asume the same may happen on discharge as anything under 1A doesn't count or whatever the threshold is for bms
before i had panels on my inverter (battery backup only -SA loadshedding) i did not experience this at all
naturally worse on cloudy days when load/pv is closely matched
so i think it is like the bms gets stuck on 99% waiting to hit pack/cell voltage to reset
it may have a % set to be stuck at until it goes under certain cell voltage at the bottom
Now, i am asking you Andy, did you overcalibrate or who is pulling up your socs here?
Hallo, wie immer ein super Video, habe eine Frage, wie bekomme ich mit Victron oder mit einem jk bms bei 100% doc Akku eine Last, Heizstab zu schalten , wäre dir sehr dankbar für eine Lösung lg
I've had suspicions with my system which comprises a Seplos DIY tower with 305ah cells & 3.0BMS. SOC is always high and then can plummet to shut down voltage at 40-30% SOC on the display. So I added a Victron shunt to compare. I fully charge and reset both the shunt and Seplos BMS to 100% capacity. However, less than 12 hours later following normal use, the smart shunt can show 35% where as the Seplos BMS can show 85%. And just as your previous videos, I never achieve 100% with the seplos BMS. I have more faith with the Victron value on my system. Do you think the Seplos BMS has a discharge floor level? Which might have a different name in the settings? Maybe that's why it doesn't read values below 6% SOC?
Is yours on version 0.7 as well?
Hello, Multiplus II is it noisy when it run ??
Andy, can you please test combination of Lifepo4 and LTO in parallel? 16S Lifepo4 and 22S LTO? If it can be connected and used together in real life?
Vielleicht muss die Ladespannung auf 3,55 Volt eingestellt werden, damit die 100% erreicht werden? Ich habe seit ein paar Tagen auch 2 Seplos V3 in Betrieb und bin gespannt wie es weitergeht. Du kannst übrigens im laufenden Betrieb mit der Bluetooth Seplos Handy App die (Rest-) Kapazität manuell verstellen. Beim Master-Akku geht das einfach so,, bei den Slave Akkus musst zuerst den Stromschalter des Akkus ausschalten (nicht den An+Ausschalter) und das Kommunikationskabel zu den anderen Akkus trennen). Das Passwort der App (notwendig um Einstellungen vorzunehmen) ist seplos111.
I think I tried higher charge voltages as well without luck. I'll try again with this new firmware version. Thanks.
Hi Andy. I have a question
I got 3 jbd bms 100A very cheap and I wondered if I could make them paralell?
So in fact build it that every bms has the balancer cables connected to the same cells and the b- and p- of all bms are "working together" as if it would be a 300A bms?
Do you think that is possible?
Greetings from Germantly
Steffen
Hi Mr Andy, off topic,i would like to expand my 5 year old storage with 500 cycles, with a new identical but new battery pack, what problems do you think I might have? It would be an interesting test to do in the garage
The statistics issue (Consumption equals Production) does not exist on my system with a DIY SmartShunt.
No, that's what I said, the smart shunt is fine as well as some other BMS. But the V3 shows this nonsense.
Andy is expecting 60 amps and i am praying for any amps once the snow storm has passed ?
I am hoping for 10 amps or better some time next week. So far, zero.
Hallo Off-Grid Garage,
ik heb een vraag aan jou, ik heb bij Aliexpress een Daly BMS besteld een 12Volt 4s 300A maar ik heb een 48Volt 16s 400A gekregen, dit kan ik zeker niet gebruiken om een accu te bouwen met 4 cellen van 340 Amp?
ik zie veel filmpjes voorbij komen, en ze zijn zeer leerzaam ga zo door
vr gr Jan
Selpos came about to serve the DIY community, so therefore it would want to protect its reputation, and with new system it seems they introducted some new measures of protection in this BMS. Well thats my take on this anyway!! Would like to see how that energy card look! Cheers Andy.
Hi andi, ich nutze für alle Batterien das seplos V2. Zu deinem Problem mit den 6% es wird weiter nach unten zählen wenn es den zell unterspannungsalarm erreicht.
Und die 100% setzt er wenn alle Zellen 3,45v erreicht haben.
Das intermitten ist gut weil er die Ladung deaktiviert des wechselrichter deaktiviert somit geht die Spannung des packs auf 54V
Bei jedem Pack mache ich einen vollständigen Zyklus damit das seplos selbstständig die wahre Kapazität erfasst!
i rly like Your videos on both channels You are person that (besides one with chatgpt ai ... ) are rly good. Im from Poland and i have like 17MWh yearly use of power and mostly im using this power from off-grid batteries - im mixed on-grid/off-grid ac coupled 530kwh battery system :) from month 10 till next year month 3 im mostly on-grid because of weather - and battery like 530kWh is not enough to be any time off-grid in Poland at this time :) im optimising electricity use - because i have swimming pool heated by electric 14kwh heater and i will replace it with heat pump but this will change not much about on/off grid months basically most energy is going not for swimming pool but for 2 electric cars :)
Hello to Poland. Thanks for sharing. 14kW pool heater😬
Heya, that app on your foon looks very nice tell us more pls
How much of this error is due to the disparity between the reported voltages of the battery’s ?
It looks like the 'remaining AH' are always showing a 6 on the end....
Btw. Is there a iPhone app for Seplos ? I am only able to find an Android app.
27:49 - yes , tell us more about that energy card cause it is one of our next project, that HACS panel. That gem hidden in the last minute or so.
AND: SEPLOS should send their 1 and only BMS developer for weeks to offgrid garage and stay there till everything is fixed cause otherwise this will never happen
And this way the right person, the lead developer can visit Australia and learn from andy how to do a project and manage that right instead of this trial and error work we have faced so far.
Of cause SEPLOS pays for everything cause we have paid seplos months or years ago to get a working system which recognices when 100% is achieved and stops charging before a cell might even dy or burn. So sad that they do not get it even after Neey had learned the lessons quite well and soon. SEPLOS did not come anywhere close to Neey level of improvements.
The JK BMS is also not perfect. Personally, a 100%SOC voltage should also have a current attached to it. I've had multiple instances that my batteries charge at the middle of the day, reaching 100% soc voltage, just while charging while actually being at 50%. Messaged JK, but no reply. They removed their WhatsApp contact number. Hope that you might bring this to light, because I'm having a terrible ezperiencd.
I can't even manually set % charge, and theres nothing in the manual mentioning that if the capacity is calculated wrong, that resetting the capacity resets the calvulation.
I agree, using just the voltage is not enough. I've got the request for a tail current already on my list. Not sure if they can make another user setting though. We may end up with like a fixed current setting for this feature.
@@OffGridGarageAustralia Appreciate the response! Really great that you're working with the community and JK to hopefully bring us closer to the one BMS to rule them all.
At the moment I fixed the problem through node-red on the victron gx device. I (with chatgpt) wrote a code that takes charging/discharging, voltage, current and SoC into consideration. I increased the 100% limit on the BMS and use the node red function below. Limit charge voltage to 55.2 until charge current drops bellow 5 amps for ten minutes. The increase the voltage limit to 57V until SoC reaches 100%. At this point decrease the voltage limit to 53.6V for 4 hours.
Still testing the work around, hasn't been very sunny recently in Germany, yet.
17:14 Looks to me as of the reported SoC is based on the maximum cell voltage, not the battery voltage. Pack 2 has the largest deviation between cells and the second highest max CellV. Pack 3 had the second highest decision and the highest ma CellV.
Nice new camera but I think the auto noise leveling is screwing your audio up, your volume keeps going up and down dramatically. Noticed it a couple videos ago.
Yeah, it's when the cam sits on this hollow box next to the computer screen. It only happens then. May need a new stand for this location.
Tap on the side of the case.😂.
From what you taught me along time ago.
You are dealing with absorption.
You might get more even charging by flipping one of the terminals so positive comes in at the top and negative at the bottom as an example. Seems to even out the power to the batteries.
The question is why these companies don’t automatically recalibrate when set to lifepo4 and use voltage at the top (> 3.45) and bottom (
Hi Andy,
Great video and nice to see how you test.
But I have a question, maybe you can help me with that.
I have changed the inverter here for the new Growatt SPH7000TL3-BH UP (7Kw, 3-phase) and have connected my two Seplos standing kits with BMS version 2 (10E).
But I cannot get it to work with this Growat inverter.
After contact with Seplos, they stated that this inverter is High Voltage and the battery Low Voltage.
Maybe you know what to do or does anyone have an answer, I do not want to buy the Growatt batteries, to expensive for the storage you get.
Maybe a different BMS ?
Hope that anyone can help me out and yes I have search the internet and I see that they have connected seplos bms with this inverter.
Thank you all and off course, keep going Andy, I really like these video's.
Kind regards
From the Netherlands
that inverter only works with High voltage batteries . 100-500 V , I had the same problem with a solax inverter , ended up buying sofar ME300sp for the battery storage .
👍👍👍
Is it using 3.65V per cell as 100%?
It uses OVP as 100% trigger. A big no no...
I have noticed that most of these cheap batteries over-report in/out current by up to 10%. Poorly calibrated shunt maybe?
Please do the following test: leave only one charge controller working in full blast and compare the current going into the battery as reported by the BMS and the charge controller through VictronConnect.
Just imagine that it says 99.9...% (with the three dots, or in other words, imaging that the 9 is recurring indefinitely, being 99.99999...). In that case, since mathematically 99.9.... == 100, it will be possible to calm your OCD :)
Man, you won't believe how many emails I'm getting from people asking me for help since their inverter only ever shows 99%. Hence, I show and explain what and why this is happening. Easier to just send them a link than explaining it over and over again😂
Thanks for the ☕s, dude!
i think it is the implementation of the victron can bus settings on the seplos. on my pylontech systems i see consumption form battery / if i change the protocol type to pylontech on the seplos bms i get the consumption as well but with to high numbers. try to set the can protocol type to pylontech .... kr mike
Interesting approach...
😎
Hi, Why not use the Victron 712 BMV ? you can reset the SOC to have the right values
That's not the point... We have a controlling BMS here.
@@OffGridGarageAustralia Hello again, I understand that there is a BMS problem and I watched the video until the end. Without proposing a solution on the BMS, (I assume that it is a hardware and/or software design problem), I wrote that you could use the BMV to have a much more exact state of charge and discharge. Since it is possible to recalibrate the SOC of the batteries. Regards. ps : This is not an ad for Victron.
I have Victron 2.92 with two JK-BMS'ses and the production and consumption always differ from each other.
Ah, great. Do you have 'has DC system' turned on in your System Setup as well? If not, can you turn it on for a while and see if that makes a difference?
I have only ever tried with the original FW the JK came with back in the day.
@@OffGridGarageAustraliaI've turned it on just now and will let you know after hours
@@OffGridGarageAustralia i've turned it off but not equal production and consumption as of your system
@@SanderStolk Thanks for testing. Weird. Don't know what this is caused by...🤷♂
@@SanderStolk Do you have a smart shunt as well in your system by any chance?
What I found is as long as the smart shunt is still the battery monitor and the JK is the controlling BMS, everything works just fine. As soon as I switch the JK as both, controlling BMS and battery monitor, it shows generation = consumption.
If I unplug the smart shunt, it is the same, generation shows the same as consumption.
So, it needs the smart shunt as battery monitor to work.
Hi, my JK-B1A24S15P has much worse values now - after about 1Year 60Days it shows only 87% RemainBattery (in case of charging) and immideately this value is at zero in case of discharging the Battery (280Ah) all other values seem to be realistic except the cycle count: changed from about 75 to world record of 205865 !! switching off didn´t help .... any idea about this stupid thing ??
Best Regards from Dresden/Germany
Please set again batery capacity.couters cycle reset
@@PVnascianiethank you for this hint... it worked as described... ;-)
the bought the code from MS, or the lead programmer is a former MS employee
its not a bug, its a feature.
Many things in the V3 make no sence, i am happy to have the E10 V2 🙂
But is the V2 actually better??? I think the V1 was very good and from there on, it just got worse.
So Seplos BMS is in-Secure. I know why i use different things.
Old camera has better WB, new camera is a bit yellow. Get yourself a neutral gray card to set them up properly. Outside will be different too. The garage light will cause colour shift, partcularly with fluoros.
The new cam was filming directly into the neon lights (LED tubes) above and hence the colours showed so different. Old cam has a smaller angle and didn't get the direct light.
🐸🐸🐸
and Bronce goes to Berlin 🥉
@@OffGridGarageAustralia i am working on it
Hello83.7K moving up
🥇for you, my friend!
maybe the first battery is not balanced?
If you haven't figured out by now... Hardly any companies, engineers, programmers, sellers, or owners know much about how LFP batteries actually work....
We have explored and tested most of it here on the channel. Some manufacturers are just a bit behind...
Last.
good 🥈place.
When you see the SOC immediately going from 6.0% to 6.1% after charging (while it was at 6.0% for a long time during discharging) - that alone, in principle, does not imply that the calculation or the displayed percentage is wrong.
Let's consider the 6.0% on the display to be the 0.0% SOC that the BMS is aware of. For some reason Seplos may want to display that as 6.0% - who knows why, but that does not matter too much.
At the moment it sees a charge, it may recalibrate the low-point of the battery setting it to 0.0%, and thus immediately starts increasing the SOC to 0.1% (visualized as 6.1%).
So, yes, if there is no recalibration, there is a "3% error" as you mentioned, but if it recalibrates at the bottom capacity, all is fine in the calculations (apart from the visualization), a Victron Smart Shunt would equally recalibrate at the low-point (without the 6% shenanigans). Having said that, that firmware needs an update, because the displayed percentages undermine the its trustworthiness.
Apparently, it only ever calibrates when OVP is hit. Which i not a great design.
Seplos eh, i thought you were just saying "surplus" with an accent
Pretty much the same😄
@@OffGridGarageAustralia 😄
Software of this bms is piece of... 😂
about seplos those are rly bad bms-es... and i dont think they will be anytime good... i have 6 of this bms-es and changed them with jk bms without display :) all because seplos guys tech etc are rly stupid ... and they dont understand what You will tell them
Hi @OffGridGarageAustralia This review is intriguing; not that I'm certain, but could this be the case where all three BMS's need to undergo a 'learning capacity procedure' for the charge curve to display a correct SOC, just as explained on their PDF available on their website, "SEPLOS 280(L) Installation Guide with Active Balance Board" pdf file.
It's done by charging the batteries at full SOC 58.4v not 55.2v (which is preset as your default) then let the active balancer run for a whole night and charge back to 50% SOC After which you 'should' have a correct reading. Only then you may re-correct the max pack charge voltage back to 55.2v as the maximum ( which for those who don't know what I'm talking about, the overall pack max charge voltage is downscaled for optimal cell preservation and avoiding degradation over long-term usage. (from 3.65 to 3.45volts per cell.)
As awlays excellent, detailed video, impressive amount of time and effort you put into creating them. 💯
🔌☀⏲
Yes, they do. That's what I did numerous times. Full charge to OVP and full discharge to UVP. Then it 'learns' the full capacity. But when you then start charging to 55.2V only, it of course does not show 100%. Everyone defines their 100% differently.
That was my best guess Andy wish you lots of success@@OffGridGarageAustralia