The *ULTIMATE* BMS Guide

The ULTIMATE BMS Guide

Рет қаралды 166,191

Күн бұрын

Everything you ever wanted to know about BMS's and more
-What is a BMS
-Different Types of BMS
-Bypass vs discharge
-What do those ports do?
-Safety
-worked installation example
TIME STAMPS
01:00 - WHAT IS A BMS?
01:55 - BYPASS V DISCHARGE BMS
04:00 - BMS DIFFERENCES
05:00 - WIRING GUIDE
06:15 - COMMON CHARGE AND DISCHARGE PORTS
08:50 - BALANCE HARNESS WIRING
14:40 - DEALING WITH CROSSING BALANCE WIRES
16:18 - COMPLETED BALANCE HARNESS
16:34 - A NOTE ON FLEX
16:50 - TESTING THE BALANCE HARNESS
19:20 - WIRING THE B- AND C-
26:32 - BLOOPERS!
My Patreons are absolute legends! Support the channel here - / leewright
Buy one of these smart BMS's in my shop! - www.electricskateboarding.co.uk
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Contact me!
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#BMS #howto #guide

Пікірлер: 407

@adeydawe645 4 жыл бұрын

Hey Lee, from someone who's very new to the Esk8 scene, I find your videos really educational as I really want to build my own mountain board. Hopefully once I've watch all of these vids I might be able to do so haha. Please continue to keep up these videos your doing a great job for the esk8 community. Well done 👍

@LeeWright 4 жыл бұрын

Hey brother! Thank you very much! I'm so glad you are learning some stuff! I'll continue as messages like this get me so hyped!

@diydad5067 3 жыл бұрын

Just a word of caution. Not sure if it was mentioned in the video but just beware of over-discharging your cells, so needless to say, keep an eye on your voltage. Bypassing the BMS will disable your low voltage cutoff protection.

@juicyboi2923 Жыл бұрын

So your electric skateboard will just ride till it breaks?

@jean-luclortie5001 Жыл бұрын

Good info

@dannynapoli2169 Жыл бұрын

@@juicyboi2923 Yes it will. Once the batteries are discharged beyond a healthy 2.6v per cell, they won't retain the same charging capacity anymore.

@jonathanbayardo6732 3 жыл бұрын

My guy I'm just starting a serious college project regarding battery packs and you literally just helped me to solve all my doubts about what to do coming up next with BMS connections. Thanks a lot Lee you're amazing!

@aaronstanley6914 Жыл бұрын

Now that you learned some more does this video still hold up?

@nickk1502 3 жыл бұрын

As an American I heard “30” on those balance wires. Took me a good 2 minutes to realize you actually said “13”...😑. Great video man! Super helpful for my build.

@greatdane3343 Жыл бұрын

Excellent explanation thanks mate. I have been trying to understand the discharge side of BMS fo high current discharge applications for a long time and found endlessly conflicting info on the net. The info on bypassing BMS discharge control on high current draw applications was the missing piece of my puzzle. Legend!

@itsmedant 3 жыл бұрын

Man I absolutely love the music in the background! Keep up the awesome videos Lee!

@FAB1150 4 жыл бұрын

Thanks! Assembled my first battery with this guide, works perfectly!

@LeeWright 4 жыл бұрын

Well done brother! I'm really happy that this helped!

@_nske 4 жыл бұрын

Fantastic video mate -admirable attention to detail! I normally don't use Patreon but you're a top guy making top content, so I had to. I am not going to attempt wiring a BMS or making a battery pack myself, I just enjoyed understanding the logic/procedure/practices and filling some blanks. But what's most important is that you help educate/bring new DIY builders to the scene, keep up the great work!

@LeeWright 4 жыл бұрын

Hey man! That's awesome! Thank you for helping me out! In return you are now getting behind the scenes access, hope you will enjoy being part of the patreon crew! I just want to share knowledge and help people understand how to do this crazy esk8 building stuff - knowledge should be shared not hoarded.

@MILLERS066 3 жыл бұрын

Man am I thankful I just stumbled upon this video. I wired up my 40a BMS today and wired P- I’ll take that off. Makes total sense now.

@LeeWright 3 жыл бұрын

No worries bro, glad it helped you!

@danobonano1315 3 жыл бұрын

@@LeeWright I'm rebuilding a ninebot ptr battery pack, its 2 packs 15s2p each pack, factory was 30 amp bms can I replace them with 60 amp bms?

@WORLD-OF-MERLIN 3 жыл бұрын

Where can I purchase quality BMS’s?

@simonchurchley8088 4 жыл бұрын

Pretty handy video with a lot of gold nuggets of info there. Your batteries are a work of art. I will be after some improvements to my battery and BMS in the Icarus when the right VESCs come along.

@LeeWright 4 жыл бұрын

Thank you simon!

@jvall08 3 жыл бұрын

Great vid mate! Had an issue with my battery upgrade on my Evolve GT and decided to replace the ESC and BMS with new stuff. Was quite boggled when it came to picking a BMS. Went with a 40a smart BMS(looks similar to yours) but didn't realise I didn't have to use for discharge, only had the stock BMS to go off and didn't have a clue. So the original is actually wired for discharge then I guess.. The charge only seems so much more simple. 🤔 Thanks for all the info. It all makes alot more sense now.

@LeeWright 3 жыл бұрын

You are most welcome mate!

@johnboy4809 3 жыл бұрын

Just found your channel, really like your approach to building batteries and putting extra thought into making it as safe as possible. I'm more ebike as never been able to balance on a skateboard but have subscribed to help improve my own battery building. oh and keep the chilled background music

@LeeWright 3 жыл бұрын

Hey John, that's super cool of you to say. I think it's important to make them as safe as possible, bloody bombs haha

@matzedias 4 жыл бұрын

Your videos always come perfectly in time, so i don't have to annoy you asking how to xD

@LeeWright 4 жыл бұрын

Hehe! Glad you will find this useful@

@jwagner217837 2 жыл бұрын

What a GREAT Video!! Exactly what I was looking for. Thank you so much!

@martinem78 3 жыл бұрын

Great video brother. Appreciate the effort and it was super informational. Gonna use it for my build.

@explosivegardenreboot 2 жыл бұрын

im new to this, have some good electrical knowledge but as i say im fairly new this one. just got my first bms, nickel strips and spacer system for a 36v ebike battery for use on my schwinn stingray chopper. gonna take my time on this build as i want to do it right. currently get about 12 miles from the bike based on a 36v brushless 500w hub. plenty of torque for acceleration up to 18mph. subed to ur channel and realy enjoy the videos. great knowledge

@LeeWright 2 жыл бұрын

Sounds like a great build dude!

@hansdampf1968 3 жыл бұрын

Good advice with the smart BMS and the fish, kepton tape! Keep up the great work. Thx a lot

@modestasbitinas7369 Жыл бұрын

Thanks mate, I just got exactly what I need for the charging stuff.

@redreefbud 3 жыл бұрын

Thanks 😁 I just ordered one of your smart BMS. Molicel p42, 12s. For my kaly deck and enclosure. It had trouble finding a Daly. Was watching this video and heard you say you had one 😁 thanks again and have a great day. Esk8 Freedom. Keep up the good work

@LeeWright 3 жыл бұрын

No worries dude! Will be in the mail tomorrow!

@redreefbud 3 жыл бұрын

@@LeeWright awesome thanks 😁 hey you wouldn't happen to know where I could get one of those 12s4p flexible PCB from, would you? I know direlect robot supplies used to have them but all gone and not much coming up in Google search. Maybe some of those 4p PCB would help me out 😉 I ordered the flipsky portable spot welder. Will be my first time welding batteries together. I have done a couple buss bar packs though 😉

@redreefbud 3 жыл бұрын

Arrived today 😁 thank you very much 😁 super speedy. Only piece I'm waiting on is the flipsky portable spot welder. Maybe tomorrow. Thanks again and keep up the good work

@lhuff13 4 жыл бұрын

Best BMS video on KZfaq, nice 👍

@LeeWright 4 жыл бұрын

Thank you!

@TimWoodVlog 4 жыл бұрын

Getting super nerdy! I'm loving the education 👍

@LeeWright 4 жыл бұрын

Thanks Tim! Super nerdy! 🤓

@rodscott7232 3 жыл бұрын

you teach us so much, Thank U Lee

@edo7611 2 жыл бұрын

I love the details. Thanks 🤘

@marktaylor7619 2 жыл бұрын

Very well done. Awesome editing or the video!

@m.frohlich2651 Жыл бұрын

Nice explanation, i learned things 👌 Thanks man 👨

@chanosio 3 жыл бұрын

amazing tutorial thanks bro!!

@simgplusnervt4698 3 жыл бұрын

Well done, thank you!

@eskatesafetee9262 3 жыл бұрын

Great video learnt heaps

@MyWorldAsDylan 3 жыл бұрын

Super informative vid bro 🙌👌🤙

@nathanmaybrey6930 3 жыл бұрын

This is such a helpful video! I'm looking to build my first battery pack (10s2p) with 21700 cells. Are there any other considerations which are needed when using these cells in terms of a BMS? Thanks!

@hamzamardini6156 4 жыл бұрын

bloopers is my fav part but im going to buy that bms :) (12s)

@LeeWright 4 жыл бұрын

Awesome! Yeah the bloopers is funny! 😄

@Bassplayingypsy 4 жыл бұрын

Lee. You the man. I learned a lot about BMS seems I thought I knew. Lol. Almost as funny as you video ending. I'll be getting with you about a 12s battery pack built by you. Blind I am. It would be very dangerous if I were to try and build a big battery, or a battery of any sort for that matter. Hope you'd be intrested in building one for sale. Keep them vids coming. Good stuff.

@LeeWright 4 жыл бұрын

Hey bro you are welcome! Yes we build batteries for sale no probs

@Bassplayingypsy 4 жыл бұрын

@@LeeWright thank you bro. Now to get my money right. These times has my money all funny. Let me know a price for 12s5p 21700 cell battery pack. It's going on a drop down board but it's 41.5 inch long at 10 inch wide. Should be enough room to accommodate that big ol battery pack. Oh. Might need a vesc too. Again, thank you Lee. Safe riding mon frère.

@startcherif 4 жыл бұрын

Very thanks for your nice video

@LeeWright 4 жыл бұрын

No problems!

@movation 4 жыл бұрын

Great work lad perfect battery build but you extended the balance wires off camera this is a trick for new players may not be aware of. Only thing I would have done different would be add a inline fuse to charging port. But not required. 5 star build mate.

@LeeWright 4 жыл бұрын

Yup! I fuse all my charge ports! I put the fuse on the board end of the loom not the battery. Ta bud, hope this video is useful to people venturing into battery building

@jamesmason7124 3 жыл бұрын

Thank you for sharing your ideas with us I’m about to start looking for a 4s BMS but I need at least 300 amps and Bluetooth what would you recommend keep up the good work and stay safe

@ASeSkater 4 жыл бұрын

Great Vid Lee. Feel like im in esk8 school

@locatejohn 4 жыл бұрын

Great video. You you make a video where you start from the beginning on how pack the 4P, spot weld, and daisy chain the cells?

@LeeWright 4 жыл бұрын

I have something similar on my channel already bro 👍

@TheEVside 4 жыл бұрын

Great video mate, really interesting (although my wife had to translate the electronics parts) :) , battery work really good. And loved the bloopers :)

@LeeWright 4 жыл бұрын

Hahaha! Brilliant. Is the wife an electronics eng then?

@TheEVside 4 жыл бұрын

Yeah she’s been building printer circuit boards as a job for 20 odd years

@TheEVside 4 жыл бұрын

Printed

@kompadoodle 2 жыл бұрын

Aw thanks dude I couldn't find anywhere how to install this game!! I just cleared Volcanic!

@charlesnewkirk7031 Жыл бұрын

Thanks!!!!!!

@whitefeatherslinger8194 10 ай бұрын

Good vid ,well explained 👍,(ive done exactly what youve done but when connecting b- to the bms the bms blew!very annoying anyway the only thing i can think of was the last bms's harness had the black lead looped into the next port on the harness and then continued as normal,would that have been why the bms blew or any other suggestions would be greatful)keep in mind i double checked and taped down properly before harness or main b- was connected 👍

@javieruriel 3 жыл бұрын

what are the considerations taking into account when we trying to pick the right bms for our battery?

@LeeWright 3 жыл бұрын

What S count your battery is, whether you are going to run bypass or not and what your charge current will be

@toad2039 3 жыл бұрын

thanks

@johanbrittz9054 Жыл бұрын

Hi Lee thanks. Its a great well explained video. Can you perhaps confirm whether one can use a 7S Li Ion Battery BMS 18650 module also on a 7S pack of 26650 cells?

@AlexKosarevs 4 жыл бұрын

Thanks for the video ;)

@LeeWright 4 жыл бұрын

You are welcome bro!

@mrkeopele 10 ай бұрын

VERY INFORMATIVE thank you, i do have a question: can i setup the cutoff voltage of the BMS to anything i want with a smart bms and the app? I want to try and use my battery cells down to 2.8 before they shut off discharge flow. I watch my parameters as i ride my ebikes so I would like to see if i get more range and same life span with a lower shut off voltage.

@scepticalbudha2553 3 жыл бұрын

Hi. Very educational video. Thanks. Im trying to put together a battery pack for my motorcycle with each cell 2.1 amps. 5 rows in parallel and three cells in series to give 12.6 V fully charged at 10.5A. As Im a newbie, I do not know which BMS I should use and how to connect. your assistance if possible will be highly appreciated.

@lorenznoichl3252 4 күн бұрын

great video, great music

@maxwellspeedwell2585 2 жыл бұрын

Great vids, Lee! I’m high in the mountains (off-grid. Of course), and I’m part-way through making a light. Checked the self-discharge rates, and it looks like I can use 96- 18650 cells, and a 3W,3v CREE LED. Any chance of a tutorial on how to assemble this? What BMS is needed, etc.. Thanks! - “Mad” Max Speedwell

@ivanmcnamee5656 4 ай бұрын

Love the video. I have a few dead cells in my battery pack. Is it possible to replace the dead ones. Without causing others issues with the hole pack.

@SparkyJames 3 жыл бұрын

Thanks, Good video very informative!! ....I’m guessing you have a G7x camera , I had one and that auto focus drove me nuts, if you haven’t replaced it already you can actually program in the part you are trying to focus on as a face to make it focus quicker or just use an iPhone

@freethinkesk8117 3 жыл бұрын

Hey love the video! (And the bloopers 👌) I have a scenario question for you. What if one wanted to swap out the BMS after the pack has been built and used? *Scenario* The buddy you're making that battery pack decides to switch out the BMS for a differen't one once receiving it. What precautions would one have to take?

@LeeWright 3 жыл бұрын

Great question dude. The short answer is that is totally fine to do. The longer answer is firstly, as always make sure you insulate any battery contacts as you go but it would be a case of just desoldering the old one and replacing it with the new one. Just observe all the usual safety precautions and you will be golden

@ShanakaAbeywickrama 3 жыл бұрын

Great video. Question - will that BMS also balance charge?

@AngleGroupProductions 3 жыл бұрын

Can you do a video or quick topic on fuses and why one would use it and why we shouldn't use it?

@abramzacharias1 Жыл бұрын

This video is most helpful from all the other videos I watched. I'm trying to build my first battery pack with 18650 cells 13s 3p with a lifepo4 bms (charge only). It's a 16s bms, and I believe it puts out a slightly less voltage. And I have a 2a charger for it. Would that still work?

@rogerioprofessor1465 2 жыл бұрын

Perfect

@adventureswithsteve2981 4 жыл бұрын

Cheers for the video Lee. Can you provide a size and link for the blue battery heatshrink please.

@chriswf 2 жыл бұрын

I'm curious how much power the bluetooth module constantly draws. Like a BMS always pulls a tiny bit of current, right? That's why you have to recharge unused battery packs after several months, right? So how fast does the bluetooth drain the batteries?

@amerkhafagiable 11 ай бұрын

Great vidro bro.can i use 14s bms to 13s battery pack and how ?

@wes8732 Жыл бұрын

Nicely done sir. I appreciate emphasis on clean safe work area. Lions are nothing to play with carelessly. One thing with these BMS builder/maker/diy videos ? Limited to zero mention of BMS WIRING SEQUENCE. I.E. 'connect negative & then sequentially wire individual cells', or 'wire negative lead, then positive lead and then connect cell bms lines, or it doesn't matter, wire it up with correct polarity & bms lines. Perhaps it's not relevant if no damage can occur from wiring from either pole & all cell lines in between. I have just not seen any mention of 'specific' BMS wiring sequence. Though I highly rate this video as quality information. Thanks for this video! Liked n sub'd

@paulridgway3364 3 жыл бұрын

Great Video! You mentioned that locations of temperature sensors is important, but didnt show them. Where are those places on the battery?

@LeeWright 3 жыл бұрын

Only that they need to be spread apart and need to be in close contact with the cells

@sr8shoota 2 жыл бұрын

I have not built a battery but I starting to get all the equipment and supplies. What I and wondering is if I can get a bms that can do 14s and the in the future I can upgrade it to a higher 16s or hight 8f 8 want to upgrade my motor?

@gujda101 4 жыл бұрын

Love your video, Can you please tell me do I have to use separate or common port bms for ebike battery (72v 20s 3p, 80A continuous) Thx

@hishammustafa880 Жыл бұрын

Hi please what is the difference between P- and B- in BMS and does lithium battery packs need special chargers or any smart charger can work with them ? Thanks

@JAYRAY00 Жыл бұрын

Some or all BMS boards are listed as 3s, 4s etc. Do i need to get one that matches my series? Can i use a 4s for a 3s setup? If so, which balance wire do i omit? Which brands are good, where to buy reputable brands, what to look for in a bad/good bms. If i want to be able to use the battery and charge it at the same time, is that possible? Do i need a specific bms for that?

@codystiles9580 Жыл бұрын

I’m super new to making battery packs and anything related to bms I quite enjoyed this video and I wanted to ask a few questions that are related. First question what was the total output in voltage and amperage of the pack you made in the video? Second question which may be dumb sounding but again new, can I make these have a voltage of 120-180+ volts? Third question what is the max amperage if possible to run in parallel that these packs can handle? Fourth question do you have more videos related to the bms, making batteries such as these and what I just asked about so I can watch them? I do like asking these questions to gain information but I’m more of a visual and hands on learning so it sinks in more that way for me

@camerongordon2378 4 жыл бұрын

Where do you get the huge battery heat shrink wrap from and what size would be needed for a 12s 7p mountain board pack

@harleyjordan7668 Жыл бұрын

Hey, great video. I am building a portable computer monitor and am struggling to get a system with both BMS and state of charge, so my users can see their battery level on led’s or something. Do your skate boards have a battery level indicator? Any advice for how to wire it up?

@dirtydogfpv6905 4 жыл бұрын

hi grate vid you inspire me would this work as a field charger for lipos

@dirtydogfpv6905 4 жыл бұрын

but with out the bms and a ballance lead

@justbreakingballs 3 жыл бұрын

Hey Lee If I’m setting my controller to max 18a will a 20a bms be sufficient of would you want a bit more margin between them or does it not matter as the BMS is only concerned with the charging aspect of the pack? Or does the load drawn from a cell pack pass through the bms meaning the bms needs to rated equal or above the max current draw from the cells. I hope my question makes sense. Thanks

@user-pwfus 2 жыл бұрын

Can you use any bms with the same cell count if it the same type of system? Also if it is the same type of system and cell count can you just use the existing wiring and cut and join the wires using your new bms harness?

@thedarkplague4 2 жыл бұрын

I'm very tight on space with the build I'm planning. Is there a even more compact bms than the daly? I plan on using it for charge only too.

@edmacneel547 2 жыл бұрын

Hi Lee, where do you recommend placing the temperature sensors. Does the phone app allow for alarming a high temperature? Thanks, Ed

@MonkeyUK. 2 жыл бұрын

Can u please help me your video was absolutely amazing and I now understand my BMS a lot better. But can I asks u what is the black wire that is sort of a loop it’s the only way I can put it. It’s comes from the BMS and god back to the BMS but loops on it self. Can u help me in what this duz please

@jeffsit_davidli.333 3 жыл бұрын

Hi Lee, when the battery pack is not on a load (not connecting to any appliance or device) or even charging, will the BMS be still working automatically to balance the cells ? the cells will discharge themselves over time, not sure if the BMS still detect the pack and start balancing according to the cell parameter. Thanks !

@johankumpula 2 ай бұрын

I am building a 4S pack for use in my Tesla, the pack will sit in parallel with the stock battery, but will a BMS be able to let the charge current from the DC-DC converter through or do I have to solve this another way?

@1112223333111 2 жыл бұрын

I have a 48v 26ah pack and it had imbalace section. I got it charging then the green light come on but with I unplug the charger it falls to 38V. I plug the charger back in it shoots to 54 and stays green. I tore the battery pack open and unplugged the bms and jumper the charger straight to the battery bypassing the bms and still same result. does the 18650 have a fuse in it? it floats 54v but no current. thanks!

@taruix603x5 3 жыл бұрын

Can you connect in parallel the BMS to get more current?

@ttkuratani 3 жыл бұрын

Hi. I have a bms from the same manufacturer and I've connected everything like their datasheet and the charge/discharge (-) wire is connected to the C- port. My doubt is not how I should split it? Can the C- feed the my esc and split into a charging port or should I use your setup (B- to the BMS and then to the esc and C- just exclusively as a charging port)?

@user-mf1vc1yi8c Жыл бұрын

Hey there. Great video, I am attempting to build a 7s charger and got a load of different bms models. The one I am currently testing has no bypass so what I did is split the P- line in 2 and add a switch to change between the Charger- and the Load-. This is essencially the same as the bypass configuration right? Also, if all I have is a voltage dc supply, to what voltage should I set to charge a pack of 7s lipos? 29.4V would be their 100% voltage, but can this present any danger? Should I set to a lower value?

@danmortimer8608 2 жыл бұрын

Thanks man. Are you able to answer some questions about my battery pack? I am trying to fix a couple of packs that have drawn too much current through their BMS systems.

@django1364 3 жыл бұрын

Excellent videos would you charge to build a replacement pack for the Ninebot E+ and to ship to the Caribbean?

@zamazakati 3 жыл бұрын

Hello! Im missing the calculations for what BMS to take, Ampere etc.

@donovancook8218 3 жыл бұрын

I’m building a 6s 22.2v 30ah lipo battery for my board would I have to buy a 22.2v or could I buy a 25v bms and also it’s a 30ah so would I have to buy a 30ah bms?! Please help!!

@kheavmady8780 3 жыл бұрын

does all BMS support series connection? example 12v + 12v to 24v. will it burn out when charging in 24v ?

@PeterOrrick Жыл бұрын

Can I connect the battery directly to the hover board, bypassing the BMS?

@johndecowski9352 4 жыл бұрын

What do you use for a charger. I'm building a 10s100p golf cart battery. Also do you just charge it through the pack pos?

@gerry5029 Жыл бұрын

I have a mercdes smart ebike with a 48V 8.4AH battery.Cells are still good but BMS is shot.BionX which made the battery is defunct. Any suggestions for a Replacement!

@timothyodum4994 8 ай бұрын

Hey Lee, building a 10s 36v 15ah pack seen plenty of videos of how to wire the bms but what do you use to power them to charge? I have a Li-ion battery charger that outputs 42v 1.5ah would that do it?

@Todd_G_FPV 2 жыл бұрын

What's your take on the cheap bms' on ebay? I got one for my 48v 13s battery build but it dont seem to be well balanced according to a few of the cells. It has a separate port for charge and discharge but would only charge to 4.10 per cell until I hooked the two together and now it'll fully charge but was testing each cell voltage and some are .10 to .15 higher than others

@stefans.8027 4 жыл бұрын

Very helpful. Thanks Lee! What about this "fish paper"...can't find it.. can I have a link to some on Amazon or somewhere? Thanks mate!

@LeeWright 4 жыл бұрын

I have it for sale in my shop bro www.electricskateboarding.co.uk

@mohamedshafeelmohamedbilal6364 2 жыл бұрын

Do need themistor BMS for 20s? And how much capacity BMS need for 1500W 72v bldc controller ?

@emilthryse3306 4 жыл бұрын

how did you wire both a Bluetooth unit and the vx1 to one com port on the vesc?

@kaylor87 4 жыл бұрын

Great video! I have built a few packs myself so far and already know most of the basics, but stayed and watched the whole video for any new tips and tricks you might show me along the way :) Thank you! I do have one question though, which is why I ended up here in the first place... When shopping around and looking at the specs of a BMS, they always have a 'Max Amperage' rating. However, unlike some other types of devices, nowhere in the BMS specs does it list any sort of "Peak" or "Surge" power rating. Why is that? Is that maybe because the BMS acts more like a switch, and the moment you exceed it's Max Amperage rating, it just shuts off? There is no rating for Peak or Surge power, because that's not how they work?

@LeeWright 4 жыл бұрын

Correct bro. The BMS will indeed shut off if you exceed the max rating. The rating should be considered the max you can pull, I just dont discharge through the BMS so never had any issues!

@kaylor87 4 жыл бұрын

@@LeeWright Perfect, thanks so much man!!

@doncodman913 Жыл бұрын

Hi Lee. Hope you might be able to help me ... i have a copy Xiomi 365 scooter . I am sure the massive bms board is fooked. Do bms boards connect to its controller via bluetooth do you think ? I can the scooter to run for a few seconds then get the error message of no communication to battery . Some beeps and flashes counting out the error code. Im glad ive found someone in UK ,you, that might be able to supply some parts and advice for my future projects. hope to hear from you Don Codman

@sdcoffeeroaster 3 жыл бұрын

I'm a emtn biker using a hoverboard battery as a range extender on my Focus Jam2 ebike. I'm also looking into building some packs, learning as much as I can before I try that and have a quick BMS question. If you use the BMS in bypass mode, what keeps the bike from running down the cells too far? Must be the ebike controller preventing that because my hoverboard batteries are in bypass mode. In that case is their any advantage to running the discharge thru the BMS? If sized right won't it prevent an ebike from pulling more current from the cells than is safe preventing overheating? Again I'm guessing the ebike controller does that too. In my case I'm making an ultra light 10s1p from tesla 15A 21700's. Obviously I don't want to pull too much current from these and ECO mode will help prevent that but I'm wondering if selecting a 15A BMS and using it discharge mode. thanks, love your videos. I've learned a lot.

@LeeWright 3 жыл бұрын

Awesome stuff bro! Yes for a bike you want to run in bypass for sure. The reason why we don't run in bypass on an esk8 is there are no mechanical brakes. If that BMS cuts the power you lose all braking. For an elite you don't need to worry about that so I would run discharge. Good luck and you are welcome bro, glad I could help!

@AlexAlex-tn4xd 3 жыл бұрын

Hi, if I have a controller that have maximum current 48v 18 amp and i put a battery that has 48v 40 amp i will burn the controller? Thanks

@aleszverca Жыл бұрын

Hey thanks for this video, just what I was looking for. I am a newbie at battery building, but have electrical education background if I am right this is a 12S5P pack you have here right? Do you maybe know what kind of BMS is built into generic factory built Chinese battery packs I have a 13S4P (Ownboard Zeus) pack and had a power cutout mid acceleration which catapulted me of the board...and was wondering if the BMS was the quality mf....as it definitely wasn't the road or me... I am asking because I want to build another cruiser board with a 13S3P pack and want to choose a BMS that is a good choice between size/reliability.