Hello, Free and I ship it for free. If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
@@WattHour Great and detail video! I currently building a 3s pack with samsung vtc5a ( max discharge 35A ). What wires should I use? 8awg are enough? Does this apply to the connections with the bms? Thank you!
Actualu, I try to seek every youtuber that build batterypack, but they didn't explain about bms as complex as you are Hats of for you sir, excelent explanation :3
I've seen many sketchy and questionable videos about BMSes and am happily surprised by the quality of your explanation and your review. Many thanks for your work 👍🏼 You deserve much more subscribers.
Very in-depth, probably the most in-depth analysis of this module on the internet. It was valuable to see the actual model number of the original design in this video (hx-3s-fl25a-a), because the module I was using was completely nameless, but identical, so it was hard to find info on it.
I am sorry to say your pronounciation confused me, on occasion but I thoroughly enjoyed your video because of your details and thorough explanations. As someone who is just getting involved in electronics experimenting after many years working in an unrelated field, I appreciate your explanations. Keep producing these videos!
Very nice video , I have used these boards for a few battery packs I build 2 years ago. They haven't failed me yet. I have the version you are holding at 6:35 and the battery terminals have a metal plate on them so you can spot weld nickle strips to them instead of soldering wires. It's set up so the strips line up perfectly to the cells to keep the strips short. I paid about $3 USD for each in a pack of 3. Very cheap.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Earned a subscriber! I’ve been looking for instructions on building a custom 8s charger for 18650 cells and this is what I needed to understand the technical aspects of these boards!
I searched eBay for "12V 3S 40A Lithium BMS" (without quotes) and results return "Standard", "Enhanced" and "Balanced", but don't know which I should be using. I'm thinking of putting together a few packs for use with my UPS's using the battery boxes on eBay (searched for 12V 10Ah 3S 7P). Thanks for the very educational video!
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
I’ve been looking for this channel for a while now. I seen it playing but at the time couldn’t sub and later when I went to look at my history it was gone. Finally I have it saved now and subbed. Thanks.
This is was the best video about BMS! Thanks ! I was figured out about make a test recharging the batteries and consuming it at the same time. My doubt was if BMS manage it or it's just 2nd Kirchhoff law. Of course with a power supply at the same level of the recharge voltage in BMS.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Thankyou. I haven't been considering the current I supply when charging. I just connect anything that outputs the correct voltage. Car battery was on the list till you helped me see the light. I've got plenty of Buck converters with current adjust just gathering dust & waiting for a purpose like this.
2.3v is very low for over discharge protection. I've been trying to find a cheap board like this, but with higher discharge protection voltage (like 2.7-3v), but all of them seem to go so low that I'm worried for the lifespan of the battery
@@BAMB00STE Exactly! 2.3 is way too low for most 18650s and all of these cheap boards have the same specs. I connected 3 batteries too a board similar and one cell is dead since it let it go way low. Another thing I did was put 2 low 3.4 (ish) voltage cells with a one that was 4.0v and it overcharged the 4.0v cell rather than stop charging it while the other cells caught up.
Outstanding video sir! Thank you so very very much for taking the time to make such a very good tutorial for everyone to learn from!!! Thank youuuu!!!!
I made an ups with 3s 25a BMS and 6cells of 18650. My router supports 12v 1.5amp. Can I use a 12v 5amp adapter to charge the ups alongside to power the router. 5a-1.5a=3.5amp for my 3s battery pack (6*18650 batteries total (🔋🔋+🔋🔋+🔋🔋)) Is it alright to use 12v 5a charger? Is it going to quickly reduce the battery lifespan?
I realize your video is now over 3 years old but I still have questions. You showed three cells charged to the max and then applied 17 volts to show over voltage protection. I'm wondering what would happen if you applied this same voltage to a drained battery pack. Would the individual cells accept a charge at this point? Is there an internal voltage regulator that would drop it from the 17 volts to the appropriate levels for charging and then cutoff at maximum charge? And what happens if one of the cells is internally shorted such as the middle battery in this case? Would the BMS still manage to charge the remaining two batteries? Would it simply cutoff all charging? Your individual battery volt meters, are they going to read correctly if the middle battery was shorted internally?
Very excellent vlog . bro . I will salute your hard work. And the vlog is very informative. Liked from india. Perfect knowledge and very good picturisation . nothing is left very nice and elaborated vlog nicely explained.
its actually a normally close temperature switch. it go open circuit when it temp rating is exceed. (usually 40C) this will also cause the main mosfet to turn off. after it cools the switch will again close and circuit will resume normal operation. If board does not come with temp switch one can be added but you need to remove the zero ohm resistor that is used to bypass the missing temp switch. it usually next to where temp switch is soldered.
11:03 OC is not Over-Current protection output, but an Over-CHARGE output, which turns the MOSFET off to stop charging once the battery reaches a certain voltage. Also, I have a BMS board (actually a protection board) which has its P- (negative output for the LOAD) taken from the Drain pins of the MOSFETS.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Good video! thanks for all the detail. Question: Can you use fewer cells than the board is designed for? Can you only install 3cells on a 4 cell board and have it work properly?? Thanks
Fantastic explanation of the BMS and step by step review of the BMS features. Really it has given me the knowledge about the BMS. I wish to change the Ni-cad cells of my cordless drill to Lithium - ion batteries. The voltage of my cordless drill is 12 V. What are the requirements for this conversion and the electronics involved in doing so. Also kindly enlighten me that is it possible to use a BMS for a 3sand4p set-up of lithium ion battery. If so what's the procedure for it and the charging parameters, such as supply volt and current, then the BMS Board to be used. Your reply will help many people who are afraid to convert their drills, and toys having Ni-cad cells to lithium ion batteries. Hope to see your guidance soon.
I am glad you found it useful. converting this module is impossible. as I mentioned each chip is made for specific voltage and you can't change it. may be we can add components to make it work but it won't be fully automatic. as for 3S4P, when you connect 2 or 3 battery in parallel, this module will see them as ONE. except the capacity increases. But series will change the voltage and it won't work. it will kill the module.
@@WattHour Thank you so much for immediate attention and response. Now I am clear that altering the ni-cad cells based drilling machines or for that matter is not possible with lithium ion batteries and BMS. That's why people show only the single cells with BMS.
@@WattHour His drill is 12volts. A 3S pack charged is 12.6volts. The voltages are correct so why won't it work? Do these drills draw more than the 40A rating of these BMS boards? An electric motor usually just runs slower with less voltage so I would think the pack would work until you got down to the low voltage cut off limit for cell protection. I've purchased four empty 12.6volt battery boxes from Ali Express. These come in kits and include 18650 holders, the nickel strips and a BMS rated at 20A or 40A that's exactly like ones in your photos. Some of the kits use a 3S7P configuration while the others use a 3S10P (3 series X 10 parallel) configuration. Your video made it clear that there's no way these BMS boards can balance charge any more than 3 cells! Ali Express has a lot of vendors selling on their site much like Amazon does here in the States so they are not to blame for these questionable 18650 battery box kits. I do now wonder how safe they are without battery balancing.
Hi Really great tutorial, I am building a solar bank for my garden. If I have 4 18650 in parallel as one bank and have 3 of these in serials can I use a s3 BMS to keep each bank balanced. Many thanks Cliff
Hello, this video clip was very impressive, is it possible to put a similar clip about the work of the BMS cards for charging the batteries of the 20-volt parkside devices, please?
Great video & detective work! But I think you might be missing something re the 2213 balancing circuits (or maybe it's me). Yes, if somehow a cell were over 4.2 V, the 2213 would drain it till it reached 4.19. But...we're more interested in what happens during charging. Here, if the available charging current is enough, there's nothing to stop a cell from going above 4.2 V. The 2213-controlled FET will be on, diverting ~70 mA away from the cell and reducing its charge rate, but it'll continue to charge until the OV chip disconnects everything. The simpler boards only have a 2213, so that's the bigger problem I'd guess...
This is what I was searching for. I was testing this BMS yesterday, and it didn't seem to have cell-level over voltage protection at all. Essentially makes it useless IMO.
@@vhfgamer 3 batteries in series when fully charged will be 12.6 volts and you need to supply at least 12.6 volts to this board for it to charge the batteries to 12.6 volts... you can actually supply the board with a bit more than 12.6. I have a similar board, it says it will handle up to 13 or 14 volts, I forget which it. This board, in many ways, is for the most part useless.
Thanks for such a clear explanation video; I have a board HX-4S-F30A (4S 30Amps) I am connecting 4S3P 18650 battery pack to it, I can read all the correct values on each B-, B1, B2, B3, B+ ports, it comes with a P- and P+ ports as well which work as Charge and Discharge ports, it has NO additional Charging or C- port. When I connect a car break light bulb (12v , 55 watt max draw) to the P+ and P- port the bulb doesn't light up and the P ports drop the voltage to 0 and then they go back up to 11v but it never goes back up to 15-16v again. I have tried 4 boards of the exact same model and they all act the same way. It seems like the board is protecting itself but I don't understand why, since the bulb is a 12v and the current for it shouldn't be more than 10 amps, this board is supposed to handle 30A x 12v = 360w What am I missing? any help will be greatly appreciated.
@WattHour All batteries are brand new, same lot, charged to 4.20v (Sanyo 2200 mah capacity) I have tested these boards with 3 different sets of 4S3P and the last test was with 4S1P just to eliminate or reduce variables. The behavior is the same.
Hello, thank you for the video. I am using such 40A bms but with 10mosfets version (REV2.3 was printed on the back side). Suddenly I noticed that battery voltage is 0.4-0.6V higher than output voltage. The voltage difference is noticed between B- and P-. I tried to short B- and P- as some people suggest but no reaction, problem still exist. This was not always like that, at the begging of use it was fine. Have you ever experienced such problem? Any ideas how to solve it?
Thanks for the great explanation we needed. Just a small question, as this has overcurrent protection threshold about 200mV, if they add 0.025 ohm(two 0.05 Ohm resistor in parallel) resistor in series , the threshold overcurrent voltage should reach at 8A, then how does this provide 40A or more?
From what I understood, he mentioned the 40A current limit refers to either, (but I'm not sure which) the max charging input current, or the max charging current the module can deliver to the batteries, not the final module maximum output current, but I may be wrong on that. 8A you mentioned sounds more realistic, however, from memory, he did show the mosfets rated at 63A, so perhaps the max module output of 40A is reasonable.
Great directions you've maid. Would you be kindly tell how about to reduce batteries charge cycles amount? How to unplug the load from batteries while the charger power supply is on and we need to power on the load from the initial power supply? How to commence the charging only if voltage dropped to a precise value? For example I don't want to get my batteries charging everytime, but after a certain discharge (voltage drop)? Thanks
Great 👍🏻 thank you but std charging per cell is 4.2v at 1625ma is around 6.8watts so 3 battery’s around 20watts only but u are charging with 13v 3a is 39watts which is double the std. you must be confused with data sheet 4.2v with 1625ma not 12.6v with 1625ma
Nice explanation on this topic. I have a question however: I'm using one of these managers to assist a pack of four batteries (4S) to feed a 14.4 cordless drill. There is a problem, the overcurrent (short) protection trips every time I pull the drill trigger. I wonder if I solve it by shorting the current sampling resistors (and shutting down the overcurrent protection) or there is a better solution for that. Could you please advise?
I have been playing with a knock-off set of 18/20 V Dewalt batteries. Dewalt seems to have the charging BMS in the charger rather than the battery pack. They have individual cell voltages as well as the main connections in the connector. When it is in the tool, there is no overcurrent protection such as there is in the BMS. Having the BMS in the charger cuts costs, for the sack of a more complex connector. The video illustrates just how complex lithium batteries are and the real danger of not charging them properly. There have been a number of house fires locally due to charging scooter batteries. The Dewalt battery pack has 5 pairs of parallel cells in series. So the BMS works with a pair of cells rather than one.
Can a 2s battery system be connected to a 3s BMS..and input voltage given accordingly, like 8.4 volts? Also, these BMS, do they automatically do trickle charge ( if initial battery voltage less than threshold) And do constant voltage charging when battery reaches upper threshold and automatically cut off when charging finishes? Does the BMS handle all these and just a constant current source with appropriate voltage needs to be attached to the BMS? Also, if constant current is set on the power supply, how does the bms do the trickle charge/ constant voltage charge at low currents?
I only have a power source of 12v 1A which I suppose would not be enough for charging a battery pack with this BMS connected. So I charge these cells individually by disconnecting them from the BMS using tp 4056. When the cells are charged, I put them back to the BMS, keep it for a few hours yo get properly balanced. Is this way advisable? (I do this Because I don't have a good current capacity 12v supply for charging my battery)
There is some thing that I didn't understand. Why 510k resistor used between P- and B-. The circuit is on charge or discharge mode because of that 510k resistor...
Is it possible to connect multiple BMS modules in parallel, similar to what you explained for the TP4056? I want create a 3S-3P battery with 9× INR18650 or INR21700 cells. I'm looking to make an 11.1V - 3S battery with high current capacity of 3× 3S wired to gether in parallel, with only a single pair of + and - output wires. Also, if connecting modules in parallel is possible, what would be the best way to calculate the maximum output current? ie: Is the max useable current determined by the maximum output current of the module, or by the maximum output current capability of the batteries? Thank-you for your assistance.
thanks for this! very helpful. I've been thinking about combining this with a lithium polymer pack for easy charging. i do have one question though, if your input voltage is at 12.0 for example, will the battery still charge to the maximum of 12.4 volts? or would you need to raise the input voltage. thanks!
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Hello, Thank you so much for this great video ! Question about the over current / over discharge protection : would it be possible to turn a 20A BMS into a 10A by removing one of the 0.05 ohm current sensing resistor ? The resultant current sensing resistor would then be twice higher, so the current needed to reach the protection threshold voltage should be twice lower, correct ? Is there any reason NOT to do such a modification ? (I can’t find 10A BMS online…) Thanks again !
Hello, the higher the current, the higher the voltage across a resistor. So if you want to reduce the current, then increase the resistor so the voltage is increased. Now change the resistor such that the value of the resiwtor is twice as large as the original values. Removing a resitor will increase the resistor value. yes.
Great video. I am new to the battery pack world and I learned a lot with your video. What is the small voltage readers you are using 23:04? Thank you so much.
I checked the time and there was not (small) voltage measurement. But as I continued watching at 27:23 I've shown the current passing from resistors. that voltage can be used using ohm law to find out the current I=V÷R
@@WattHour I checked 23:04 and you do have a small voltage meter attached to each cell. I think he was interested in maybe purchasing these tiny digital volt meters.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Very helpful thanks but wanted to know the no. of maximum cells the board can handle as is divided by 3 . 0 v to 4.2 v and 4.2 to 8.4 and 8.4 to 12.6 or is possible to doable the each cell by 2cells in series v will same but capsity will doabled
Question: I made a battery pack with the same module (3S25A) for a 12V cordless vacuum. But it only runs half a second then cuts power. Tested it on a 12V cordless drill, works fine. Also tested the drill's battery pack on my 12V vac, again works fine. What could be the problem. Help will be very much appreciated.🙏
Im planning to build an uninterrible power supply (UPS), can I use this BMS in that? or in other words, can this bms discharge the energy whenever the power supply is not supplying energy?
So for some reason on my BMS and I have 3 brand new ones when I hook them up the voltage on the pack reads 12.50volts but on the B- B+ it reads 11.50v everything has been hooked up to balance wires and when I test the balance plug each series of cells reads 4.15v so the only thing that’s not the correct voltage is the bms. Can I move the wire from B- to the 0v side of the board? When I do that it reads the 12.50v but I’m not sure if this is bypassing the bms or not.
Hi, very informative video, big thank you for the excellent content. The quality of you BMS looks good, can I ask the make and the cost of the 3s 40A BMS please and is there facility to monitor the status of the board? or do you have to buy a different board that affords that option and if so can you recommend some quality products, thanks and carry on with the vlogging you are doing a great job:)
Hi, you are welcome. This has no make or model. I have provided link in the description of the video. I am not sure how much a seller is truthful to ship the exact item photo they present. but our of 1000 purchase I have seen only 1 or 2 incorrect. in regards to the monitoring, Unless we make custom module I am not aware if there is such things. Good luck and stay safe
Hello, Free and I ship it for free. If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
How about Papua New Guinea?
Got another one to give? 😂
😢😢😮😮😅😮😅😮😅😮😮😮😮😮😮😮😅😮😮😮😅😅😮😮@@amokutoheti599
15:21 15:21 15:21
There is no way this guy isnt an educator in real life. This was too good.
One of the most comprehensive videos on BMS. Thank you kindly.
Glad you enjoyed it! Please subscribe. I appreciate it and helps my channel grow. Thank you
@@WattHour Great and detail video! I currently building a 3s pack with samsung vtc5a ( max discharge 35A ). What wires should I use? 8awg are enough? Does this apply to the connections with the bms? Thank you!
THIS CHANNEL NEEDS MORE RECOGNITION !!! HE EXPLAINS IT SOOO WELL
Thank you. please share it with your friend via email and Facebook or other means.
Actualu, I try to seek every youtuber that build batterypack, but they didn't explain about bms as complex as you are
Hats of for you sir, excelent explanation :3
I am glad you found it useful. Please subscribe. I appreciate it and helps my channel grow. Thank you
Made me a nice Certificate.
WattHour University
Thank you Professor Jax.
Lol. Thanks
I've seen many sketchy and questionable videos about BMSes and am happily surprised by the quality of your explanation and your review. Many thanks for your work 👍🏼
You deserve much more subscribers.
Very in-depth, probably the most in-depth analysis of this module on the internet. It was valuable to see the actual model number of the original design in this video (hx-3s-fl25a-a), because the module I was using was completely nameless, but identical, so it was hard to find info on it.
You have put so much effort in this video. Thank you so much for this detail analysis no one in TH-cam is providing this much information 😊
Glad it was helpful!
This is the most informative video I have seen regarding Lithium batteries and BMS operation.
I am sorry to say your pronounciation confused me, on occasion but I thoroughly enjoyed your video because of your details and thorough explanations. As someone who is just getting involved in electronics experimenting after many years working in an unrelated field, I appreciate your explanations. Keep producing these videos!
Very nice video , I have used these boards for a few battery packs I build 2 years ago. They haven't failed me yet. I have the version you are holding at 6:35 and the battery terminals have a metal plate on them so you can spot weld nickle strips to them instead of soldering wires. It's set up so the strips line up perfectly to the cells to keep the strips short. I paid about $3 USD for each in a pack of 3. Very cheap.
I don't understand all but I can understand some. I want to say it's a great explanation. Thank you so much.
Your explanation was really helpful for a novice like me in understanding the BMS. Tqvm!
Finally a guide for newbies, I wish I've found this earlier, very good and in depth explanation. Thanks!
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Earned a subscriber! I’ve been looking for instructions on building a custom 8s charger for 18650 cells and this is what I needed to understand the technical aspects of these boards!
I searched eBay for "12V 3S 40A Lithium BMS" (without quotes) and results return "Standard", "Enhanced" and "Balanced", but don't know which I should be using. I'm thinking of putting together a few packs for use with my UPS's using the battery boxes on eBay (searched for 12V 10Ah 3S 7P). Thanks for the very educational video!
you are welcome. the more you pay the more features you get.
good information
love from India🇮🇳
best video about bsm's! comprehensive and accurate, yet simply explained.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
I’ve been looking for this channel for a while now. I seen it playing but at the time couldn’t sub and later when I went to look at my history it was gone. Finally I have it saved now and subbed. Thanks.
this video was under my other channel youtube.com/@Robojax. I moved it here which is focused on Energy and chargers etc. you are welcome.
@@WattHour 😂 wouldn’t you know.....
I’m subbed there as well.
It was meant to be. ❤️ 😂
This is was the best video about BMS! Thanks !
I was figured out about make a test recharging the batteries and consuming it at the same time.
My doubt was if BMS manage it or it's just 2nd Kirchhoff law. Of course with a power supply at the same level of the recharge voltage in BMS.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
@@WattHour thank you very much. But i'm from Brazil. A little bit far away lool. Thanks for all attention!
Excellent accurate and in great depth - Well done!
Thankyou. I haven't been considering the current I supply when charging. I just connect anything that outputs the correct voltage. Car battery was on the list till you helped me see the light. I've got plenty of Buck converters with current adjust just gathering dust & waiting for a purpose like this.
Wow this channel is a hidden gem. Nothing like this on youtube.
2.3v is very low for over discharge protection. I've been trying to find a cheap board like this, but with higher discharge protection voltage (like 2.7-3v), but all of them seem to go so low that I'm worried for the lifespan of the battery
The discharge value is determined by the manufacturer. if they say, it will be okay.
@@BAMB00STE Exactly! 2.3 is way too low for most 18650s and all of these cheap boards have the same specs. I connected 3 batteries too a board similar and one cell is dead since it let it go way low. Another thing I did was put 2 low 3.4 (ish) voltage cells with a one that was 4.0v and it overcharged the 4.0v cell rather than stop charging it while the other cells caught up.
Best explanation on TH-cam. Awesome video. Just subscribed
Beautifully explained, in detail and data given and cct demystified,………!
You have done an excellent job , . Many thanks …….!
Lots of good info. Thanks for showing all the features, especially the short-circuit protectdion.
Great video, explained like no other video I have seen so far. Thank you, Sir.
You are welcome!
I think the T terminal is where you connect a temperature, sensor such as a thermocouple, and does not act as a test point.
This is a great channel, we must support this channel subcriber
Outstanding video sir! Thank you so very very much for taking the time to make such a very good tutorial for everyone to learn from!!! Thank youuuu!!!!
I made an ups with 3s 25a BMS and 6cells of 18650. My router supports 12v 1.5amp. Can I use a 12v 5amp adapter to charge the ups alongside to power the router.
5a-1.5a=3.5amp for my 3s battery pack (6*18650 batteries total (🔋🔋+🔋🔋+🔋🔋))
Is it alright to use 12v 5a charger? Is it going to quickly reduce the battery lifespan?
I realize your video is now over 3 years old but I still have questions. You showed three cells charged to the max and then applied 17 volts to show over voltage protection. I'm wondering what would happen if you applied this same voltage to a drained battery pack. Would the individual cells accept a charge at this point? Is there an internal voltage regulator that would drop it from the 17 volts to the appropriate levels for charging and then cutoff at maximum charge?
And what happens if one of the cells is internally shorted such as the middle battery in this case? Would the BMS still manage to charge the remaining two batteries? Would it simply cutoff all charging? Your individual battery volt meters, are they going to read correctly if the middle battery was shorted internally?
Very excellent vlog . bro . I will salute your hard work. And the vlog is very informative. Liked from india. Perfect knowledge and very good picturisation . nothing is left very nice and elaborated vlog nicely explained.
Very nice and clean explanation, very helpful..
Glad it was helpful!
What do you recommend for 5X 18650, as BMS and as charger , and what is the minimum power supply I should use please?
Very nice presentation
Suded
You mean a 5S battery? So 21v max?
Hey, amazing explanation, thank you! Do you think its possible to charge and discharge at the same time?
Very interesting and good explanations and nice experiments setups - THANKS.
Excellent video. I have noticed that some BMS boards have a temp sensor input.Can you elaborate on it’s application?
its actually a normally close temperature switch. it go open circuit when it temp rating is exceed. (usually 40C) this will also cause the main mosfet to turn off. after it cools the switch will again close and circuit will resume normal operation. If board does not come with temp switch one can be added but you need to remove the zero ohm resistor that is used to bypass the missing temp switch. it usually next to where temp switch is soldered.
11:03 OC is not Over-Current protection output, but an Over-CHARGE output, which turns the MOSFET off to stop charging once the battery reaches a certain voltage.
Also, I have a BMS board (actually a protection board) which has its P- (negative output for the LOAD) taken from the Drain pins of the MOSFETS.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Thank you for this video. I learned a lot.
Good video! thanks for all the detail. Question: Can you use fewer cells than the board is designed for? Can you only install 3cells on a 4 cell board and have it work properly?? Thanks
Fantastic explanation of the BMS and step by step review of the BMS features. Really it has given me the knowledge about the BMS.
I wish to change the Ni-cad cells of my cordless drill to Lithium - ion batteries. The voltage of my cordless drill is 12 V. What are the requirements for this conversion and the electronics involved in doing so. Also kindly enlighten me that is it possible to use a BMS for a 3sand4p set-up of lithium ion battery. If so what's the procedure for it and the charging parameters, such as supply volt and current, then the BMS Board to be used. Your reply will help many people who are afraid to convert their drills, and toys having Ni-cad cells to lithium ion batteries. Hope to see your guidance soon.
I am glad you found it useful. converting this module is impossible. as I mentioned each chip is made for specific voltage and you can't change it. may be we can add components to make it work but it won't be fully automatic. as for 3S4P, when you connect 2 or 3 battery in parallel, this module will see them as ONE. except the capacity increases. But series will change the voltage and it won't work. it will kill the module.
@@WattHour Thank you so much for immediate attention and response. Now I am clear that altering the ni-cad cells based drilling machines or for that matter is not possible with lithium ion batteries and BMS. That's why people show only the single cells with BMS.
@@WattHour His drill is 12volts. A 3S pack charged is 12.6volts. The voltages are correct so why won't it work? Do these drills draw more than the 40A rating of these BMS boards? An electric motor usually just runs slower with less voltage so I would think the pack would work until you got down to the low voltage cut off limit for cell protection.
I've purchased four empty 12.6volt battery boxes from Ali Express. These come in kits and include 18650 holders, the nickel strips and a BMS rated at 20A or 40A that's exactly like ones in your photos. Some of the kits use a 3S7P configuration while the others use a 3S10P (3 series X 10 parallel) configuration.
Your video made it clear that there's no way these BMS boards can balance charge any more than 3 cells! Ali Express has a lot of vendors selling on their site much like Amazon does here in the States so they are not to blame for these questionable 18650 battery box kits. I do now wonder how safe they are without battery balancing.
Hi Really great tutorial, I am building a solar bank for my garden. If I have 4 18650 in parallel as one bank and have 3 of these in serials can I use a s3 BMS to keep each bank balanced. Many thanks Cliff
So a 3s4p battery with 12 cells? Yes this will work. I have used a bunch of these boards from 3s2p upto 3s5p and it works fine.
@@randybobandy9828 Just what I was wondering. Thanks !
Thank you Mr. Mohamed for your helpful videos, can we connect these bmss in series
Hello, this video clip was very impressive, is it possible to put a similar clip about the work of the BMS cards for charging the batteries of the 20-volt parkside devices, please?
Exactly the video I was looking for for a while now. Can you fix the link to the resources you used here, link is broken. Thank You..
Great video & detective work! But I think you might be missing something re the 2213 balancing circuits (or maybe it's me). Yes, if somehow a cell were over 4.2 V, the 2213 would drain it till it reached 4.19. But...we're more interested in what happens during charging. Here, if the available charging current is enough, there's nothing to stop a cell from going above 4.2 V. The 2213-controlled FET will be on, diverting ~70 mA away from the cell and reducing its charge rate, but it'll continue to charge until the OV chip disconnects everything. The simpler boards only have a 2213, so that's the bigger problem I'd guess...
This is what I was searching for. I was testing this BMS yesterday, and it didn't seem to have cell-level over voltage protection at all. Essentially makes it useless IMO.
@@anelinnonmaa How would it go over 4.2 volts per cell if there is only ever 4.2 volts provided to it?
@@anelinnonmaa Yes, very useless.
@@vhfgamer 3 batteries in series when fully charged will be 12.6 volts and you need to supply at least 12.6 volts to this board for it to charge the batteries to 12.6 volts... you can actually supply the board with a bit more than 12.6. I have a similar board, it says it will handle up to 13 or 14 volts, I forget which it. This board, in many ways, is for the most part useless.
@@ForwardGuidance Well when I provide 12.6 volts to the board, what comes out is 4.2 volts per "cell".
Appreciate the tests! What's a good discharge rate for the thermals for this board? I'm hesitant to buy this and find out I can't do 30A
Awesome man, very thorough
I am pretty sure that your TH-cam upcoming star for exploring n testing... i subscribed.
Keep it up sir.
Thanks for the sub!
You are great at this. But i want to ask a dump question. Do we connect the charge discharge on the same p-/+ ?
Well explained. Thanks a lot Sir!
Excellent presentation, Thanks
Great vídeo. Greetings from Mexico.
Thanks from Bangladesh
Everything is clear but is this module is protecting the cells from being overcharge?
BMS means protection.
and I explained it. I even mentioend the voltage and how it stops the current.
Love you from Bangladesh ❤❤❤❤❤❤❤❤❤❤❤
Thanks for such a clear explanation video; I have a board HX-4S-F30A (4S 30Amps) I am connecting 4S3P 18650 battery pack to it, I can read all the correct values on each B-, B1, B2, B3, B+ ports, it comes with a P- and P+ ports as well which work as Charge and Discharge ports, it has NO additional Charging or C- port.
When I connect a car break light bulb (12v , 55 watt max draw) to the P+ and P- port the bulb doesn't light up and the P ports drop the voltage to 0 and then they go back up to 11v but it never goes back up to 15-16v again. I have tried 4 boards of the exact same model and they all act the same way. It seems like the board is protecting itself but I don't understand why, since the bulb is a 12v and the current for it shouldn't be more than 10 amps, this board is supposed to handle 30A x 12v = 360w
What am I missing? any help will be greatly appreciated.
Hi, you did not mention the battery condition. it seems your battery does not have enough charge and the module is protecting it.
@WattHour All batteries are brand new, same lot, charged to 4.20v (Sanyo 2200 mah capacity) I have tested these boards with 3 different sets of 4S3P and the last test was with 4S1P just to eliminate or reduce variables. The behavior is the same.
this is strange. Something is affecting this operation. I am not sure.
thank you man ;, realy very rich content and very educational so detailed , this was realy helpfull
Very informative. If you can add the cell balancing observations to the video also, that would be really useful
thanks. It is here th-cam.com/video/l2APm5olDiA/w-d-xo.html
Hello, thank you for the video. I am using such 40A bms but with 10mosfets version (REV2.3 was printed on the back side). Suddenly I noticed that battery voltage is 0.4-0.6V higher than output voltage. The voltage difference is noticed between B- and P-. I tried to short B- and P- as some people suggest but no reaction, problem still exist. This was not always like that, at the begging of use it was fine. Have you ever experienced such problem? Any ideas how to solve it?
very nice review. What is the main purpose of s1s2 test points and how do I use it?
Hi, I would not find what they were.
was wondering also for years now, actually
Where do you get the documentation for the device marking codes? That is also a hard task to achieve.
Thanks for the great explanation we needed. Just a small question, as this has overcurrent protection threshold about 200mV, if they add 0.025 ohm(two 0.05 Ohm resistor in parallel) resistor in series , the threshold overcurrent voltage should reach at 8A, then how does this provide 40A or more?
From what I understood, he mentioned the 40A current limit refers to either, (but I'm not sure which) the max charging input current, or the max charging current the module can deliver to the batteries, not the final module maximum output current, but I may be wrong on that.
8A you mentioned sounds more realistic, however, from memory, he did show the mosfets rated at 63A, so perhaps the max module output of 40A is reasonable.
Clear explanation bro make more like this
Thank you, I will
beautifully explained
Thanks for liking
Appreciated it in making , but my friend would like to ask you if we want to make a 6v 3W 3A and connect it with 3W 8.97v 3A solar panel
can anyone explain me why charging current exceeds 2 Amps at 26:48 ,when we have limited the constant current at 2 Amps
Great explenation! Thanks for the nice job!
you are welcome. Don't forget to subscribe. I really appreciate it.
Great directions you've maid.
Would you be kindly tell how about to reduce batteries charge cycles amount?
How to unplug the load from batteries while the charger power supply is on and we need to power on the load from the initial power supply?
How to commence the charging only if voltage dropped to a precise value? For example I don't want to get my batteries charging everytime, but after a certain discharge (voltage drop)?
Thanks
Awesome and amazing Video about BMS 🥰
Glad you liked it!
thanks for detailed video
You are welcome
Great 👍🏻 thank you but std charging per cell is 4.2v at 1625ma is around 6.8watts so 3 battery’s around 20watts only but u are charging with 13v 3a is 39watts which is double the std. you must be confused with data sheet 4.2v with 1625ma not 12.6v with 1625ma
4.2V is maximum when the battery is full.
Nice explanation on this topic. I have a question however: I'm using one of these managers to assist a pack of four batteries (4S) to feed a 14.4 cordless drill. There is a problem, the overcurrent (short) protection trips every time I pull the drill trigger. I wonder if I solve it by shorting the current sampling resistors (and shutting down the overcurrent protection) or there is a better solution for that. Could you please advise?
I have been playing with a knock-off set of 18/20 V Dewalt batteries. Dewalt seems to have the charging BMS in the charger rather than the battery pack. They have individual cell voltages as well as the main connections in the connector. When it is in the tool, there is no overcurrent protection such as there is in the BMS. Having the BMS in the charger cuts costs, for the sack of a more complex connector.
The video illustrates just how complex lithium batteries are and the real danger of not charging them properly. There have been a number of house fires locally due to charging scooter batteries.
The Dewalt battery pack has 5 pairs of parallel cells in series. So the BMS works with a pair of cells rather than one.
Try adding a 10-100uF capacitor across the output terminals it should help with the starting current.
Is there any BMS with over temperature sensor and cell balancing added along with other features?
Can a 2s battery system be connected to a 3s BMS..and input voltage given accordingly, like 8.4 volts?
Also, these BMS, do they automatically do trickle charge ( if initial battery voltage less than threshold)
And do constant voltage charging when battery reaches upper threshold and automatically cut off when charging finishes?
Does the BMS handle all these and just a constant current source with appropriate voltage needs to be attached to the BMS?
Also, if constant current is set on the power supply, how does the bms do the trickle charge/ constant voltage charge at low currents?
I only have a power source of 12v 1A which I suppose would not be enough for charging a battery pack with this BMS connected. So I charge these cells individually by disconnecting them from the BMS using tp 4056. When the cells are charged, I put them back to the BMS, keep it for a few hours yo get properly balanced. Is this way advisable? (I do this Because I don't have a good current capacity 12v supply for charging my battery)
There is some thing that I didn't understand. Why 510k resistor used between P- and B-. The circuit is on charge or discharge mode because of that 510k resistor...
Is it possible to connect multiple BMS modules in parallel, similar to what you explained for the TP4056?
I want create a 3S-3P battery with 9× INR18650 or INR21700 cells.
I'm looking to make an 11.1V - 3S battery with high current capacity of 3× 3S wired to gether in parallel, with only a single pair of + and - output wires.
Also, if connecting modules in parallel is possible, what would be the best way to calculate the maximum output current?
ie: Is the max useable current determined by the maximum output current of the module, or by the maximum output current capability of the batteries?
Thank-you for your assistance.
You are a genius 👏
Very informative. Thank you
The connector with s1,s2 is a temperature sensor input point.
What value NTC to connect in order to use it ? Currently it is shorted with ohm resistor.
Quite well explained!! Many thanks.
I only missed something about balancing.
Isn't it included in the BMS?
It does not have it. I have videos on balancing modules
@@WattHour thanks! I'll check it!!
thanks for this! very helpful. I've been thinking about combining this with a lithium polymer pack for easy charging.
i do have one question though, if your input voltage is at 12.0 for example, will the battery still charge to the maximum of 12.4 volts? or would you need to raise the input voltage. thanks!
Very well explained. Keep up the good work. Subscribed to the channel 😀
I love the video can you please do a discharge tes of that kind of bms?
This is only charger. I have videos on how discharging
@@WattHour Where i can´t find it!
i have found a 60 amp version online id like to know if it will work as a BMS for motorcycle battery using 4p 3s
excellent overview!
Hi, thank you very much for your guidance, I want to know whether can we connect several BMS seriously on getting more voltages
Hi, you are welcome. you can't comment more. this is for 3S and if you connect more than 3, it will burn.
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Can I add two cells in parallel in this bms to make a 3s2p pack, to increase capacity?
Hello,
Thank you so much for this great video ! Question about the over current / over discharge protection : would it be possible to turn a 20A BMS into a 10A by removing one of the 0.05 ohm current sensing resistor ?
The resultant current sensing resistor would then be twice higher, so the current needed to reach the protection threshold voltage should be twice lower, correct ?
Is there any reason NOT to do such a modification ? (I can’t find 10A BMS online…)
Thanks again !
Hello, the higher the current, the higher the voltage across a resistor. So if you want to reduce the current, then increase the resistor so the voltage is increased. Now change the resistor such that the value of the resiwtor is twice as large as the original values. Removing a resitor will increase the resistor value. yes.
@@WattHour Thank you !
Great video. I am new to the battery pack world and I learned a lot with your video. What is the small voltage readers you are using 23:04? Thank you so much.
I checked the time and there was not (small) voltage measurement. But as I continued watching at 27:23 I've shown the current passing from resistors. that voltage can be used using ohm law to find out the current I=V÷R
@@WattHour I checked 23:04 and you do have a small voltage meter attached to each cell. I think he was interested in maybe purchasing these tiny digital volt meters.
Does it balance the cells? Did I miss that in the video?
Thankyou for explanation.. 👍
Hello, If you live in Canada or USA, I am giving away this DL24P 180W load and energy meter. Make sure to sign up for it th-cam.com/video/-UblSfUEY-0/w-d-xo.html
Very helpful thanks
but wanted to know the no. of maximum cells the board can handle as is divided by 3 . 0 v to 4.2 v and 4.2 to 8.4 and 8.4 to 12.6
or is possible to doable the each cell by 2cells in series v will same but capsity will doabled
Question: I made a battery pack with the same module (3S25A) for a 12V cordless vacuum. But it only runs half a second then cuts power. Tested it on a 12V cordless drill, works fine. Also tested the drill's battery pack on my 12V vac, again works fine. What could be the problem. Help will be very much appreciated.🙏
Im planning to build an uninterrible power supply (UPS), can I use this BMS in that? or in other words, can this bms discharge the energy whenever the power supply is not supplying energy?
So for some reason on my BMS and I have 3 brand new ones when I hook them up the voltage on the pack reads 12.50volts but on the B- B+ it reads 11.50v everything has been hooked up to balance wires and when I test the balance plug each series of cells reads 4.15v so the only thing that’s not the correct voltage is the bms. Can I move the wire from B- to the 0v side of the board? When I do that it reads the 12.50v but I’m not sure if this is bypassing the bms or not.
Hi, very informative video, big thank you for the excellent content. The quality of you BMS looks good, can I ask the make and the cost of the 3s 40A BMS please and is there facility to monitor the status of the board? or do you have to buy a different board that affords that option and if so can you recommend some quality products, thanks and carry on with the vlogging you are doing a great job:)
Hi, you are welcome. This has no make or model. I have provided link in the description of the video. I am not sure how much a seller is truthful to ship the exact item photo they present. but our of 1000 purchase I have seen only 1 or 2 incorrect. in regards to the monitoring, Unless we make custom module I am not aware if there is such things. Good luck and stay safe