It's probably jumping (I'm building my own BMS) since they are probably using a voltage divider network and by the time we divide the smallest voltage cell, the resolution will be much less since the resolution of the ADC will not change. E.g. If you use the same divider configuration for the 14th cell (58.8v to 4.2v with a ratio of 1/14) then the first cell will also be divided by 14. Therefore the battery will only vary from 0-0.3v and you'll get poor resolution. There are other ways to deal with this, but that's my guess for this board
Thanks for the video and for the update. Looks like they're using BQ76940 BMS IC form TI alongside ATmega328p (Arduino). The IC can manage cells between 9-15S, all you have to do is to short certain pins of the chip (see Table 8-3 on the DS). There's also an open source firmware for basic battery management and monitoring, which means this thing could be hacked. Arduino BMS library: github.com/LibreSolar/bq769x0_ArduinoLibrary BQ76940 Datasheet: www.ti.com/lit/ds/symlink/bq76940.pdf
BQ76940 is a nice little chip. Have done some work on it myself. It does the job pretty well and I have even designed PCB for that one including the ESP8266
It would be cool to get a access to the source code of the bms. It seems to have almost everything you need but with a crappy interface. We could easily convert that interface to be more "batrium-like"
Not sure if its doable to even get close :) Why I say that is because the hardware is so simple. But yes you can do alot with it but i would say its easier to write from scratch. Though add a better MCU like and ESP32 and your set for something. But its it worth mentioning all the hours put into a good BMS. I would take one of the existing on github and continue with if i were to do it :)
Hello. Just saw your video and I have some questions. Are there any BMSes available for lipos? Since the discharge cutoff is usually higher at 3.2/3.3v. I can't seem to find many on the market that do that.
That would be great for a small emergency power box (like what Jehu is building for Puerto Rico). Be good to plug in the laptop/phone from time to time to see what it's doing.
I bought one of these a while back and was pretty impressed with it. I've hooked up a relay are using a little power supply that I can use to control a heavier load. This of course bypasses the BMS accessibility to read current and amp hours. I also noticed when I downloaded the new app for reading the cells that it also seems this device data logs which is another nice feature. When using it to power a relay I needed to come up with a power source to trick the BMS transistors into turning on the relay when charging was okay. Thanks for your video it would have helped me a while back when I was trying to figure this out. I can see these being used for solar systems which is what I'm doing at the moment. I did a video also and it's up on RUclips you can see it by clicking on my profile
Looks like a good starting system for many people. The language thing is a problem on the mobile app part. I bought a VR goggle set with Bluetooth controller. The goggles were fine, but the controller didn't work. I went to the manufacturers site and it was in Chinese (?) I tried using the Windows translator function and nothing happened. Sent the whole mess back to Amazon and bought a different brand and this time the controller works great, but no matter what I do I can't see the videos with the goggles. Hope this doesn't happen if I try the BMS.
Köpt precis en likadant för 10s for diy elcykel batteri och väntar på att komma fram från kina . Tror du att det är värt ? Har du en god råd till mig angående pålitliga bmsar ? Jag Skrev på svenska eftersom insåg att du oxå bor i Sverige , hoppas det är ok . Apropå ! Tack för alla intressanta videos .
Thats the cheap versions. Problem with those is that you cannot set voltage levelels and you cant see whats going on. You kind of dont know if they are in balance or not and have to add extra voltage displays. Thats why I like this version as a step up. I hope to look more deeply into it later on but need to get that cell1 sorted first.
the ssr can be used on 3D printers for heated beds. Maybe as a project for you. With all stuff you have got. try build a 3d printer or something else like a 3d printer.
Any chance you have like to your specific model? Your links go to a general search, with many different vendors, and i've asked several if they had a datasheet for serial interface protocol, and those that responded said no :-/
Thanks for the useful info! You mentioned that you can use the 14S version also on lower S configurations. I build a 7s24p 18650 pack, can I use this bms on it? If so, how would you wire it?
Sure, but my comment was in relation to your observation that the temperatures were different despite being co-located. Great video. Just ordered 3 of these. Trying to get my hands on the APK source. Any ideas?
Hej! Tack för din video! Jag bygger en del batterier till elscootrar och har ett problem som jag undrar om du vet hur man kommer förbi? Själv setupen är så att man har ett original batteri på 36/42v som jag kopplat i serie med ett 12v batteripack. Då får man upp hastigheten och hela systemet kan klara av det. Men problemet är när man ska ladda batterierna så behöver man koppla ut 12v batteriet och ladda det separat. Såg en som säljer såna pack med en ny bms som man inte behöver koppla ut när man ska ladda 12v packet och undrar om du vet om det är en smart bms som denna använder då den inte vill berätta va den gjort. Tack på förhand!
Very Nice. As you know I have this BMS connected to the same 48v pack from your video. I had a rough time getting it to actively balance. Based on whay you just displayed I believe the issue is I had both Balance control options selected at the same time. I dont think it likes that. The only time I got any balance activity was when I used the Balance Odd and Even under the Other function tab. Looking forward to see how you use this in future projects. FYI from the phone you can lock the BMS where u cannot make any changes on the computer. Just in case you havent seen that yet.
You need to use either balance charge or the normal balance. If you click out the balance charge it will start to balance if you have that condition and all values correct. The odd/even is just a test-function
I am at the stage now researching BMS. This video has really helped. Do you know what are the differences between a BMS for, Lifepo4 and Li-ion? As I am using 18650's 8s8p. They are Li-ion, but, would a Lifepo4 BMS work, or are the set voltages not right, and so I must ensure, especially if I buy the none adjustable BMS, to get the LI-ion version only. I guess this adjustable version would be a better option, but I wold like to understand . Thanks for some great informative videos.
Thanks Daniel, that was a very good introduction. It's obviously aimed for the massive ebike market in China, and I think I might get one for my 14s16p battery even though 50mA balance current probably way too small to be useful with my mongrel cells! (I've had to modify some cellpacks already to swap some leaky cells and it's pain to do). It's nice that an ebike battery can be used for the bike, or for home! I like that this BMS has programmable thresholds, but the noisy reading on cell one is some cause for concern. Hopefully just spurious. Still, it looks like it'll do the job until my packs grow big enough to justify a Batrium system.
Yeah I also think that Ebikes is a perfect system to run it. They have up to 26+s or something. Yeah my cell1 readings was way off. From start it read like 1.9V!! Im going to contact seller and see what it says. I think my unit have an issue
I guess I don't really need one because I balance charge using a 300W 6S lipo charger, but have to do it 3 times - gets a little tedious after a while, especially if I fall asleep or forget and the pack isn't ready! So, I bought a 60A one from Aliexpress and look forward to playing with it, though I don't have a 58V charger yet apart from the 7210A, which would be slow but still usable. Maybe there's a dry joint in Cell 1's path, or a software issue? Looks as if they are multiplexed so only 1 ADC is required. I'll report if mine will have a similar issue.
Nice video, just wondering if you figured what was causing the jumpy voltage on cell 1? Lugemont has a video on these smart bms and didn't show the voltage issue or not being able to change parameters from the mobile app, he used mobile app version 2.0.1006. Please let me know if you solved your issue and how it is currently working. I want to order one but if its got glitches I will wait for a stabler smart bms. Thanks in advance...
Indeed. On my 8S unit I had jumpy/low voltages on cells 1 and 2 when only the balance wires were connected. After connecting B- on the BMS to the battery negative, these voltages normalized and were completely stable.
Yes, I confrmed this on my 8S unit too. Hoping to hover around the 24v to 32v, which seems a good range for, effectively a 24v system. I am using modbus reader to read the settings from the unit, and hope soonish, to read on my arduino. It's a great monitoring unit, but with recycled cells, not too sure about balancing effectivness. Still experimenting.
Hello. I don't know why, but when I am looking for info about solar I use to finish in your videos! Thanks :) I want to try one of this BMS (100A version is now about 65 EUR) for a Chevy Volt battery. It is 16 kWh (12S8P), about 44 V nominal and the discharge rate will be about 5500 W maximum. With two 100A version of this BMS (one for 4 parallel) do you think it will be enough? Thank you!
Thanks. I wouldnt personally parallel Them because you cannot guarantee they Will share the load even and in worst case you overload the first and next dies too :) with that Said IF you make sure to stay below what 1 can handle easily it is generally not a big problem.
Hi from Italy, I have a 13s ebike battery. Unfortunately, a group of cells burned out. I decided to remove the dead cells so that I now have 12s. I then soldered pin bridge of the Smart BMS as schematic, to transform it from 13s to 12s. Can I now connect bms to the battery and uart box to PC? Or should I change some other parameter first? Software in BMS still working as 13s and will burn everything?
@@DIYTechRepairs mine I know is "multi". Anyway done: connected as 13s, setup sw as 12s using JBD Tools, than soldered pin bridge as 12s diagram. Thanks for your video, show the way.
Hi. Can you please tell me? I have this model BMS 10S , can I conect it to 12S battery. On this BMS boar can read 15S conection. Thanks and sorry for my english.
Charge current is something you set on ur charger. Some bms systems can controll the Charger based on individual cell voltages but they are few and cost more. IF you ask about over current protection a fuse is needed. Dont know IF this One have built in to controll something based on current
I have this BMS (the 10S version) hooked up to my battery pack, and everything looks fine from the app, but I cannot make it take a charge. I connect 42V to the charge port (connected to C-) but no current is let through at all. Any ideas?
Can you modify this BMS to have a higher balancing current? Switch out the resistors for something higher? I'm not sure how these boards work. Hopefully that first cell is something to do with calibration? Or maybe its fault from the factory (cheap chinese, probably has no quality control) Also the temperatures being different is probably cheap components, cheap thermistors. You should test them on multimeter to see if they read the same.
I did callibrate that first cell from 1900 to 4100.... But i guess something is off on that board I got making it jumping all around. Temperature is not as big problem as the voltage jumping. Its possible to callibrate that too :)
Cool BMS for small project. I'll probably pick one up for my portable power station. I'm going to have to get the Batrium for my powerwall though. Ouch
I wished I checked for smart BMS boards which have a chip onboard + bluetooth.. got a dumb BMS and when I realized there's smart one, was too late to cancel the order lol. good review, thanks. must be dodgy issue on that first cell on the chip level. probably happens on any cell in that slot.
Do anyone know if possible to reset this bms to factory settings. I bought one, connected as should, first time i got a lot of power according battery specs. Then i decided to reduce outut current, notcto drine battery quick, and not to go in full power. Looks like i messed with something, but since that, at full throttle motor get disengaged regularly, and some time under load computer going off itself. Battery votage is not going below. Some one gave advice, that bms output currwnt is too low. I adjusted it back to maximum 40a(not sure if needed minus on front of 40). Any way still going disconnected itself. I found that bms is notcok, as, by connecting battery directly to controller, motor going fine and computer is not going off itself. Any ideas? I tryed to reinstall app and disconnected minus from battery to bms. No success.
Great video. If I wanted to extend the life of my 18650 pack and charge each cell to 4.05V max, would this BMS do the trick? Or would the actual lithium-ion charger also need to be capped at 4.05V multiplied by (x) the number of cells in series? Thanks
Okay great, thanks for the reply. My pack is 10S so would the CC/CV charger need to be set to a max of 40.5V? And the BMS balance voltage set to 4.05V per cell?
southpaw a Charger set to 42v would be 4.2v per cell. No matter what THE balancing on THE bms is set at. IF u set balancing to 4.1 and charge to 4.2 the bms Will drain the packs to 4.1..
hello mister diy tech & repairs, i bought 2 off these smart bms. but i can not download the software on the site. i just wont download anything. can you maybe sent the folder you have to me? thank you verry much :-)
12ax7 You can set balancing to run 24h like I do. I have 30Ah 14S battery on my E-bike and this BMS is life saver. I set overvoltage protection to 4.1v to save cells life and BMS shut off charging when voltage is reached. Last version of app is on English ad its simply Amazing what you can monitor and change. You can even set pin and lock power out your battery with just a click. There is logs for every cells etc... Much more. Amazing SMART BMS.
I have 2 questions: 1. Can it be hooked up to a remote computer? 2. Do you know if this 14S system also operate on a 4S configuration? Thanks and regards, Roelof
I have just see, thank you!! My 60kwh setup would not benefit from this unfortuantely. I do NOT want to spend so much as the Batrium costs...there must be something in the middle. I look forward to watching your channel to see if you come up with something more on the Batrium level but for about $150-200 range.
On 60kWh battery bank Batrium cost is nothing. You need to set in proportion what it did cost to build that battery bank :) This BMS i would say is ok for banks up to 1kWh or so :)
Just hook up to your raspberry via serial interface. Though you need to know the protocol. I dont have the protocol but it might work with my solar-sis system that I run on Raspbery pi.
Hello Thanks for the very intresting video. would it be possible to read information from another bms using the software and usb box from this bms? i have a yamaha ec-03 battery that is restricted til 500 cycles do to software in I think the bms by yamaha. battery is still in good shape but wont charge anymore, , when i charge with alternative charger battery is okay. this is a common isuu anyone already solved this yamaha scam ?
Can I bypass the BMS for discharge? This type of BMS is rated for certain discharge current which is too low for me. Is it a good idea to bypass the whole circuit for discharge and use BMS only to charge the cells?
DIY Tech & Repairs correct. It will not be a balanced discharge. But this is what almost everyone does though. All the esk8 are build like that. Balanced charging and direct discharge bypassing the BMS. This is due to a high discharge current needed in case of electric skateboards. Sometimes it’s way over 100A. BMS can’t handle that
Thats not the issue as such. The time cost. Or more i loose money spending time on doing it myself. :) And many people dont even have the knowledge. The day I can live on this and build such things myself then I do it :P
Hey CheapVlog thanks for the idea. have you done this by yourself? I mean any suggestion how to make a high current balancer and then connect it to the cheap BMS and monitor it? thanks.
There is several videos out there. The simplest is just a couple of relays dumping the load to a big ass resistor. But there is so much more needed to get a proper system that will protect you :)
Hi, I am here in Singapore and have watched your nice Video.I have maybe some options to translate from China language ins english. if you need my help let me know.
@@DIYTechRepairs Fan vad grymt! Har febrilt sökt efter guide överallt utan att hitta något vettigt. Vet du hur man räknar ut vilken amp styrka på bms som är lämplig? Bygger ett 10s6p 36v 17,2a
Its more about capacity. Its made for 20-80Ah. Then Its Up to you to decide how much above you want to raise it. The more capacity the less chance it Will have to Keep the battery in balance
Hi! Is it possible to change battery output voltage? For example, i have 42v battery with this smart bms, but my device uses 36v, can reprogram bms to give my device 36v instead if 42v? Thx!
It's probably jumping (I'm building my own BMS) since they are probably using a voltage divider network and by the time we divide the smallest voltage cell, the resolution will be much less since the resolution of the ADC will not change. E.g. If you use the same divider configuration for the 14th cell (58.8v to 4.2v with a ratio of 1/14) then the first cell will also be divided by 14. Therefore the battery will only vary from 0-0.3v and you'll get poor resolution. There are other ways to deal with this, but that's my guess for this board
Brother i can the details of your BMS and some documents i am also making bms i need help
Thanks for the video and for the update. Looks like they're using BQ76940 BMS IC form TI alongside ATmega328p (Arduino). The IC can manage cells between 9-15S, all you have to do is to short certain pins of the chip (see Table 8-3 on the DS).
There's also an open source firmware for basic battery management and monitoring, which means this thing could be hacked.
Arduino BMS library: github.com/LibreSolar/bq769x0_ArduinoLibrary
BQ76940 Datasheet: www.ti.com/lit/ds/symlink/bq76940.pdf
BQ76940 is a nice little chip. Have done some work on it myself. It does the job pretty well and I have even designed PCB for that one including the ESP8266
If you change the system language to English on your phone, the APP will switch to English as well.
Sparkie ok check that. Think default lang is Swedish now
Interesting. I have English as 2nd so it chould have choosen that but it didnt. Moving english to 1st and it did work! Thanks
It would be cool to get a access to the source code of the bms. It seems to have almost everything you need but with a crappy interface. We could easily convert that interface to be more "batrium-like"
Not sure if its doable to even get close :) Why I say that is because the hardware is so simple. But yes you can do alot with it but i would say its easier to write from scratch. Though add a better MCU like and ESP32 and your set for something. But its it worth mentioning all the hours put into a good BMS. I would take one of the existing on github and continue with if i were to do it :)
Can you program this to charge the battery pack at lower voltage like say 4.1V per cell instead of the regular 4.2V per cell?
This is a bms and not Charger. Charging limits is set at the Charger. This bms have configurable protection voltages yes
Yes , you can actually even less . Go in settings and set parameters . You can set over voltage to 4.1 and release voltage at 4.0 for example.
Hello. Just saw your video and I have some questions. Are there any BMSes available for lipos? Since the discharge cutoff is usually higher at 3.2/3.3v. I can't seem to find many on the market that do that.
Its basically THE same bottom voltage as the other but for rc you stop earlier. Just get a programble bms for 3.7v nominal cells and it Will work :)
yes I would like to see more on the grafana nice video and bms I may look into the 7s version if they have one.
That would be great for a small emergency power box (like what Jehu is building for Puerto Rico). Be good to plug in the laptop/phone from time to time to see what it's doing.
The fact that you "can" set the values is whats matters! Thats something I have been looking for a long time now. Its not that costly.
I bought one of these a while back and was pretty impressed with it. I've hooked up a relay are using a little power supply that I can use to control a heavier load. This of course bypasses the BMS accessibility to read current and amp hours. I also noticed when I downloaded the new app for reading the cells that it also seems this device data logs which is another nice feature. When using it to power a relay I needed to come up with a power source to trick the BMS transistors into turning on the relay when charging was okay. Thanks for your video it would have helped me a while back when I was trying to figure this out. I can see these being used for solar systems which is what I'm doing at the moment. I did a video also and it's up on RUclips you can see it by clicking on my profile
there is a calibration tab there for voltage and temp sensors you need to set this up when you first get it
Or just Connect the wiring properly. I missed One Wire and that gave Numbers all over the place
Looks like a good starting system for many people. The language thing is a problem on the mobile app part. I bought a VR goggle set with Bluetooth controller. The goggles were fine, but the controller didn't work. I went to the manufacturers site and it was in Chinese (?) I tried using the Windows translator function and nothing happened. Sent the whole mess back to Amazon and bought a different brand and this time the controller works great, but no matter what I do I can't see the videos with the goggles. Hope this doesn't happen if I try the BMS.
Köpt precis en likadant för 10s for diy elcykel batteri och väntar på att komma fram från kina . Tror du att det är värt ? Har du en god råd till mig angående pålitliga bmsar ? Jag Skrev på svenska eftersom insåg att du oxå bor i Sverige , hoppas det är ok . Apropå ! Tack för alla intressanta videos .
7:08 So this does what is called "active" balancing right? Where it will balance the cells even when they are not charging/discharging?
No. Active is when it Transfers energy between the cells
@@DIYTechRepairs Oh yes of course, my mistake. Thanks
I previously bought one of the BMS boards like "GOING OFF GRID" formerly "FLIPPING 720" uses and it works very well, but no connection for monitoring.
Thats the cheap versions. Problem with those is that you cannot set voltage levelels and you cant see whats going on. You kind of dont know if they are in balance or not and have to add extra voltage displays. Thats why I like this version as a step up. I hope to look more deeply into it later on but need to get that cell1 sorted first.
the ssr can be used on 3D printers for heated beds. Maybe as a project for you. With all stuff you have got. try build a 3d printer or something else like a 3d printer.
Hello sir ,I connected to 12s, but in software interface I am unable to see battery pack SoC and min cap is showing 0 ,pls help me out
Hi, when used in a smaller pack let's say 10s the external power most be connected where in the BMS? And at voltage? Thanks
Any chance you have like to your specific model? Your links go to a general search, with many different vendors, and i've asked several if they had a datasheet for serial interface protocol, and those that responded said no :-/
Probably LSB error in the ADC depending on how they are wired up
Can someone confirm that it id possible to use this bms in a system with less cells in series (eg 10s, 36V)? Looks like their bms start at 14s...
have you found answer?
They have every version available on eBay under different seller names.
My battery has 76v but the leads coming from my bms only has 12 volts with no load. is that ok or is it not working properly?
Hi, do you think the 14s 100A version it will be enough for 14s80p tesla cells ? Thank you !
Thanks for the useful info! You mentioned that you can use the 14S version also on lower S configurations. I build a 7s24p 18650 pack, can I use this bms on it? If so, how would you wire it?
For 7s get a 7s. The above is 12-15 i think.
@@DIYTechRepairsSo you cant leave 7 of the 15 leads unconnected to use it as a 7s bms?
@@puregodzila on most No you cant. Read the spec.
You need to calibrate the NTC sensors in the Calibrate tab.
Tom Donnelly yeah. Didnt care for the temp. The voltage was more important.
Sure, but my comment was in relation to your observation that the temperatures were different despite being co-located.
Great video. Just ordered 3 of these. Trying to get my hands on the APK source. Any ideas?
Dont have it im afraid. But i guess its a normal protocol that can be sniffed. Not sure though.
Hej! Tack för din video! Jag bygger en del batterier till elscootrar och har ett problem som jag undrar om du vet hur man kommer förbi? Själv setupen är så att man har ett original batteri på 36/42v som jag kopplat i serie med ett 12v batteripack. Då får man upp hastigheten och hela systemet kan klara av det. Men problemet är när man ska ladda batterierna så behöver man koppla ut 12v batteriet och ladda det separat. Såg en som säljer såna pack med en ny bms som man inte behöver koppla ut när man ska ladda 12v packet och undrar om du vet om det är en smart bms som denna använder då den inte vill berätta va den gjort. Tack på förhand!
Kontakta mig via email så reder vi ut det. Du hittar kontakt under about här
@@DIYTechRepairs tack absolut. Det ska jag göra. God jul :)
how to connect the black box and bluetooth module to the BMS?
With only 50mA, will this only work on smaller packs or will it work with a 500mAh range with 80-100P?
Michael Neal smaller packs and packs that are very well in balance. Or if you can wait 3 weeks to balance. They are made for less than 50ah
Very Nice. As you know I have this BMS connected to the same 48v pack from your video. I had a rough time getting it to actively balance. Based on whay you just displayed I believe the issue is I had both Balance control options selected at the same time. I dont think it likes that. The only time I got any balance activity was when I used the Balance Odd and Even under the Other function tab. Looking forward to see how you use this in future projects. FYI from the phone you can lock the BMS where u cannot make any changes on the computer. Just in case you havent seen that yet.
You need to use either balance charge or the normal balance. If you click out the balance charge it will start to balance if you have that condition and all values correct. The odd/even is just a test-function
I am at the stage now researching BMS. This video has really helped.
Do you know what are the differences between a BMS for, Lifepo4 and Li-ion?
As I am using 18650's 8s8p. They are Li-ion, but, would a Lifepo4 BMS work, or are the set voltages not right, and so I must ensure, especially if I buy the none adjustable BMS, to get the LI-ion version only.
I guess this adjustable version would be a better option, but I wold like to understand .
Thanks for some great informative videos.
You have to use a Li-ion BMS with Li-ion cells. A LiFePO4 BMS won't work because those cells are full at 3.6V where Li-ions are full at 4.2V.
Thanks Daniel, that was a very good introduction.
It's obviously aimed for the massive ebike market in China, and I think I might get one for my 14s16p battery even though 50mA balance current probably way too small to be useful with my mongrel cells!
(I've had to modify some cellpacks already to swap some leaky cells and it's pain to do).
It's nice that an ebike battery can be used for the bike, or for home!
I like that this BMS has programmable thresholds, but the noisy reading on cell one is some cause for concern. Hopefully just spurious.
Still, it looks like it'll do the job until my packs grow big enough to justify a Batrium system.
Yeah I also think that Ebikes is a perfect system to run it. They have up to 26+s or something. Yeah my cell1 readings was way off. From start it read like 1.9V!! Im going to contact seller and see what it says. I think my unit have an issue
I guess I don't really need one because I balance charge using a 300W 6S lipo charger, but have to do it 3 times - gets a little tedious after a while, especially if I fall asleep or forget and the pack isn't ready!
So, I bought a 60A one from Aliexpress and look forward to playing with it, though I don't have a 58V charger yet apart from the 7210A, which would be slow but still usable.
Maybe there's a dry joint in Cell 1's path, or a software issue? Looks as if they are multiplexed so only 1 ADC is required. I'll report if mine will have a similar issue.
How big of wire gauge fits in the C- and B- holes?
Hi nice information. What SMART BMS do you recoment for high loads. 200A (low cost)
thank you
DIY bms with extra shunt trip breaker supporting 200a
Nice video, just wondering if you figured what was causing the jumpy voltage on cell 1? Lugemont has a video on these smart bms and didn't show the voltage issue or not being able to change parameters from the mobile app, he used mobile app version 2.0.1006. Please let me know if you solved your issue and how it is currently working. I want to order one but if its got glitches I will wait for a stabler smart bms. Thanks in advance...
I suspect the issues on the cell voltages, are caused by not connecting the B- on the BMS to the Battery negative.
Indeed. On my 8S unit I had jumpy/low voltages on cells 1 and 2 when only the balance wires were connected. After connecting B- on the BMS to the battery negative, these voltages normalized and were completely stable.
Yes, I confrmed this on my 8S unit too. Hoping to hover around the 24v to 32v, which seems a good range for, effectively a 24v system. I am using modbus reader to read the settings from the unit, and hope soonish, to read on my arduino. It's a great monitoring unit, but with recycled cells, not too sure about balancing effectivness. Still experimenting.
Michael Breslin thank you for the update. I saw the video you put out yesterday, thanks again and best of luck to you.
Hello. I don't know why, but when I am looking for info about solar I use to finish in your videos! Thanks :)
I want to try one of this BMS (100A version is now about 65 EUR) for a Chevy Volt battery. It is 16 kWh (12S8P), about 44 V nominal and the discharge rate will be about 5500 W maximum.
With two 100A version of this BMS (one for 4 parallel) do you think it will be enough?
Thank you!
Thanks. I wouldnt personally parallel Them because you cannot guarantee they Will share the load even and in worst case you overload the first and next dies too :) with that Said IF you make sure to stay below what 1 can handle easily it is generally not a big problem.
Hi from Italy, I have a 13s ebike battery. Unfortunately, a group of cells burned out. I decided to remove the dead cells so that I now have 12s. I then soldered pin bridge of the Smart BMS as schematic, to transform it from 13s to 12s. Can I now connect bms to the battery and uart box to PC? Or should I change some other parameter first? Software in BMS still working as 13s and will burn everything?
You need to check if that BMS even works with 12s. Its not all BMS systems you can do that on.
@@DIYTechRepairs mine I know is "multi". Anyway done: connected as 13s, setup sw as 12s using JBD Tools, than soldered pin bridge as 12s diagram. Thanks for your video, show the way.
Hi. Can you please tell me? I have this model BMS 10S , can I conect it to 12S battery. On this BMS boar can read 15S conection. Thanks and sorry for my english.
Kristapsvisums you need to rebuild it to work with 15s. When running in less then 15s they modify it
What make is your battery charger?
This looks really nice, but what is the current charge rate of this BMS? Can it charge a battery at 30A?
Do you know if it's possible to set the max charge current limit on this BMS? Thanks
Charge current is something you set on ur charger. Some bms systems can controll the Charger based on individual cell voltages but they are few and cost more. IF you ask about over current protection a fuse is needed. Dont know IF this One have built in to controll something based on current
@@DIYTechRepairs Thanks for the reply. I thought that might be the case.
I have this BMS (the 10S version) hooked up to my battery pack, and everything looks fine from the app, but I cannot make it take a charge. I connect 42V to the charge port (connected to C-) but no current is let through at all. Any ideas?
Did you hook the negative connection to C- or the pos?
Charger negative to C- and charger positive to battery positive. Battery negative to B-
Do you do anything to begin a charge cycle other than applying (constant-current) voltage between C- and battery positive?
Got it working, probably the problem was the pack was too unbalanced.
can this be used on lifepo4 3.2 volt batteries?
Yes and no. The company also offers this BMS for LiFePO4, but you have to make a choice between the Li-ion and LiFePO4 version when ordering.
what do you think I can use to charge an 18650 4S 50ah battery pack with solar? Thanks
Yes you can!
Can you modify this BMS to have a higher balancing current? Switch out the resistors for something higher? I'm not sure how these boards work.
Hopefully that first cell is something to do with calibration? Or maybe its fault from the factory (cheap chinese, probably has no quality control)
Also the temperatures being different is probably cheap components, cheap thermistors. You should test them on multimeter to see if they read the same.
I did callibrate that first cell from 1900 to 4100.... But i guess something is off on that board I got making it jumping all around. Temperature is not as big problem as the voltage jumping. Its possible to callibrate that too :)
You could potentially add external resistors. They are controlled by transistors what i saw
Cool BMS for small project. I'll probably pick one up for my portable power station. I'm going to have to get the Batrium for my powerwall though. Ouch
I was too until I realised Solaredge SE5000 is a 400v system that needs modbus to talk nice together
Nice Doc. Info . Can this cheap smart BMS do/use 8S2P lifepo4 battery bank?.
I wished I checked for smart BMS boards which have a chip onboard + bluetooth.. got a dumb BMS and when I realized there's smart one, was too late to cancel the order lol.
good review, thanks.
must be dodgy issue on that first cell on the chip level. probably happens on any cell in that slot.
I suspect the issues on the cell voltages, are caused by not connecting the B- on the BMS to the Battery negative.
is there any way to record / export this information over time?
Dont know
Do anyone know if possible to reset this bms to factory settings. I bought one, connected as should, first time i got a lot of power according battery specs. Then i decided to reduce outut current, notcto drine battery quick, and not to go in full power. Looks like i messed with something, but since that, at full throttle motor get disengaged regularly, and some time under load computer going off itself. Battery votage is not going below. Some one gave advice, that bms output currwnt is too low. I adjusted it back to maximum 40a(not sure if needed minus on front of 40). Any way still going disconnected itself. I found that bms is notcok, as, by connecting battery directly to controller, motor going fine and computer is not going off itself. Any ideas? I tryed to reinstall app and disconnected minus from battery to bms. No success.
I dont know im sorry
Great video. If I wanted to extend the life of my 18650 pack and charge each cell to 4.05V max, would this BMS do the trick? Or would the actual lithium-ion charger also need to be capped at 4.05V multiplied by (x) the number of cells in series? Thanks
southpaw THE Charger is what sets ur top voltage and not THE bms. So yes it Will work
Okay great, thanks for the reply. My pack is 10S so would the CC/CV charger need to be set to a max of 40.5V? And the BMS balance voltage set to 4.05V per cell?
southpaw yes thats One way to do it. You have to det balance values based on ur environment in THE end.
One last question: would this also work if I used a regular 42V 10S CC/CV charger? My main concern is keeping each cell voltage
southpaw a Charger set to 42v would be 4.2v per cell. No matter what THE balancing on THE bms is set at. IF u set balancing to 4.1 and charge to 4.2 the bms Will drain the packs to 4.1..
You're the best, Dan!
What Connector do those Chines BMS's use ? Guess not JST-XH type. Does anyone sell just the Connector and pig tails ?
its JST-XH on most of them. It can be tricky to get the ones for 14s and above though
The one I purchased seems to be the Mini Version of the JST-XH. Looks the same but spacing quite smaller.
Great review of the BMS system. Thanks
Really fantastic!
that is nice. and it is interesting to now more of this.
hello mister diy tech & repairs, i bought 2 off these smart bms.
but i can not download the software on the site. i just wont download anything.
can you maybe sent the folder you have to me?
thank you verry much :-)
* It just wont download
That was very informative !
Thanks a lot for the review !
Good stuff! It's a damn shame it only does 50ma however.
12ax7 You can set balancing to run 24h like I do. I have 30Ah 14S battery on my E-bike and this BMS is life saver. I set overvoltage protection to 4.1v to save cells life and BMS shut off charging when voltage is reached. Last version of app is on English ad its simply Amazing what you can monitor and change. You can even set pin and lock power out your battery with just a click. There is logs for every cells etc... Much more. Amazing SMART BMS.
@@NexiTech thank you so much for this info, this is what I needed to hear before buying!
I have 2 questions:
1. Can it be hooked up to a remote computer?
2. Do you know if this 14S system also operate on a 4S configuration?
Thanks and regards,
Roelof
1. No
2. No.
This is what I am looking for!! I need 16S however :(
Check description. They have all from 3s to 32s also.
I have just see, thank you!! My 60kwh setup would not benefit from this unfortuantely. I do NOT want to spend so much as the Batrium costs...there must be something in the middle. I look forward to watching your channel to see if you come up with something more on the Batrium level but for about $150-200 range.
On 60kWh battery bank Batrium cost is nothing. You need to set in proportion what it did cost to build that battery bank :) This BMS i would say is ok for banks up to 1kWh or so :)
did you get it to work.
Yes
Great review thank you,, Any ideas how I might connect this to my Raspberry Pi? ,, Has anyone tried?
Just hook up to your raspberry via serial interface. Though you need to know the protocol. I dont have the protocol but it might work with my solar-sis system that I run on Raspbery pi.
Is it an Active BMS or it's Passive BMS?
And what amphere is that BMS?
@@rds0009 passive. Amp what?
Hello Thanks for the very intresting video. would it be possible to read information from another bms using the software and usb box from this bms? i have a yamaha ec-03 battery that is restricted til 500 cycles do to software in I think the bms by yamaha. battery is still in good shape but wont charge anymore, , when i charge with alternative charger battery is okay. this is a common isuu anyone already solved this yamaha scam ?
Awesome, thanks!
USB means 'universal serial bus'. Therefore, talking about converting 'serial' to USB sounds kind of confusing.
Do you have a version in Russian?
Sorry I dont.
Can I bypass the BMS for discharge? This type of BMS is rated for certain discharge current which is too low for me. Is it a good idea to bypass the whole circuit for discharge and use BMS only to charge the cells?
Yes you can. Just beware that you dont have any low voltage disconnect IF you do so
DIY Tech & Repairs correct, but I will use VESC 6.6 and it has a low voltage cutoff.
@@PawelRaszewski But a VESC only senses overall voltage and not individual voltages per cell basis.
DIY Tech & Repairs correct. It will not be a balanced discharge. But this is what almost everyone does though. All the esk8 are build like that. Balanced charging and direct discharge bypassing the BMS. This is due to a high discharge current needed in case of electric skateboards. Sometimes it’s way over 100A. BMS can’t handle that
@@PawelRaszewski yeap i know. Its normal on high Power ev
Over 10X cheaper than Battrium! You can add contactor to increase current endlessly :)
CheapVlog true. But I think this has it's area for small packs meanwhile Batrium is for larger batterybanks like powerwall. :)
Building >1A balancer yourself is easy and cost nothing: TL431, resistors and transistor ;)
Thats not the issue as such. The time cost. Or more i loose money spending time on doing it myself. :) And many people dont even have the knowledge.
The day I can live on this and build such things myself then I do it :P
Hey CheapVlog thanks for the idea. have you done this by yourself? I mean any suggestion how to make a high current balancer and then connect it to the cheap BMS and monitor it? thanks.
There is several videos out there. The simplest is just a couple of relays dumping the load to a big ass resistor. But there is so much more needed to get a proper system that will protect you :)
Hi, I am here in Singapore and have watched your nice Video.I have maybe some options to translate from China language ins english. if you need my help let me know.
Thanks! Il keep that in mind!
485, not 232.
Svensk visst? Skulle behöva lite rådgivning
Jodå! :)
@@DIYTechRepairs
Fan vad grymt! Har febrilt sökt efter guide överallt utan att hitta något vettigt. Vet du hur man räknar ut vilken amp styrka på bms som är lämplig? Bygger ett 10s6p 36v 17,2a
@@Fhilipk det beror ju på vad du ska driva med batteriet i sig. Och typ av bms.
@@DIYTechRepairs elcyckel. Vad jag har försökt räkna fram med lite googlande och räknande så tror jag motorn borde dra ca 360w
Typ av bms?
锂路通这个名字起的好啊！
oops you did 2.0.1006
Lucky Seven ?
I commented below on upgrading the app version but you did... were you able to get it to work correctly?
I bland kan våran svenska vara svår även oss svenskar..hehe
You sounds swedish.
how many cells in parallel can it handle for example ill try 14s400p will it work ?
Its more about capacity. Its made for 20-80Ah. Then Its Up to you to decide how much above you want to raise it. The more capacity the less chance it Will have to Keep the battery in balance
Can you use a 13s bms in a 12s battery???
Hi! Is it possible to change battery output voltage? For example, i have 42v battery with this smart bms, but my device uses 36v, can reprogram bms to give my device 36v instead if 42v? Thx!
No. You need a DC DC converter. A bms is protection and management for battery only.
@@DIYTechRepairs as I supposed, thanks for the answer!