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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--UblSfUEY-0.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!
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.
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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--UblSfUEY-0.html
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.
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 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!
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.
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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--UblSfUEY-0.html
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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--UblSfUEY-0.html
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?
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!!!!
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.
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!
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.
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
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.
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
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.
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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--UblSfUEY-0.html
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.
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?
Need help. I have the exact same 3S25A model. How can I bypass overcurrent protection? It prevents my 12V DC motor to start. I tried shorting current sending resistor but that did not help. Thanks.
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?
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
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
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
Hello what about under voltage protection. I meam i asume the bms it self is powered by the batteries it is protecting. What if i put it away for a long time does it keep drawing power from the batteries or can it conpketely shut off? I worry the bms might cause the voltage to go too low over time. I hope i am wrong
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.
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.🙏
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.
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.
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
I don't have a module that have constant current adjustment, can i charge through it my battries, and my cells are not all same voltage can i connect those to bms or first i need to full charge it individually.?
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.
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 my drill use 20v battery so how it got wet I replace my batteries 5 battey 3.7v am getting 19.5 volt when i test the batteries even the battery indicator show that they fully charged but on bms output connector to the drill am only getting 4.add voltage any advice ?
Do I need to connect (weld, solder) batteries to the BMS board in sequence (from plus to minus or vice versa) how is it in the laptop battery so that the board does not go into protection?
I have made a pack for my drill battery with 4s 40a bms(balanced, li-ion batterys 3,7v) and i charge it cc 1,25a cv 16,8v (buck dc-dc converter) but never goes up to 16,8v from charging ..Stops until 16,3 and the battery itself has 15,85v after take it out οf charger and then increased a little bit on its own(≈ 16,0v).Means not fully charged 4,2v. Any 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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--UblSfUEY-0.html
ı think, It is wrong. P- must be connected Drains pin because current flows from drain to source in n-type. (13.20...)By the way I am confused that four of mosfets are in series and are also paralell with other four of mosfets. Not: My english can not be able to understand,sorry.
over voltage protection is when the voltage goes "Over" some value which would be more than 4.2V (I don't remember the value). Then it has release voltage to release the protection when the voltage goes down to that value, it will release the protection.
I had buy two BMS 3S 40A and when i tryied to charge the batteries something happened and the charging was stoped after 1-2 minutes and i suppose that some component was burn up becouse the batteries had 12,5V but at the end of the charging wires i had count 11.3V and continually droped down until 8,6V. This was happened two times in different BMS. I dont know where was the mistake becouse everything was double checked and was ok.
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)
Thank u sir but I have quistion and need answer .when I searching bms I found 2 kind of bms 1-balanced and other is enhanced What the different. Or what is the best balanced or enhanced Plz I want answer to buy it
Question please 🙏 I have network video recorder(NVR) ,can I use bms 3s as a UPS , by puting the output and input in the place of dc12.6v in NVR (to charge when electricity is on ,and produce when electricity is off) *NVR works with 12.6v 2A. Please answer 🙏😘
Hi. I have 4 batteries 12 v 300ah. When they reach a los voltage, the bms shutdown the batteries. How i can turn on them fast, because actually i wait 2 weeks .
Hi. I have also a 3s bms but the output is less than the supplied voltage when measuring from the P+ & P-. Does it mean, one of the mosfet is dead? I noticed this issue with few bms I have used before after using for some time. I am curious what could be the problem. thanks
