Make Matched 18650 DIY Powerwall Modules using Builder tool rePackr.com

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Website tool j35.us/rePackrCOM
Cells used in this project j35.us/2200mahCells
Cell Holders j35.us/100cellHolders
Cell Tester j35.us/ZanflareC4
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FAQ:
1) Where can learn more about batteries? j35.us/DIYlithiumBatteryBook
2) Where can I buy Lithium Batteries j35.us/Lithium-July
3) Where Can I buy Solar Panels? Flexible - j35.us/136wFlexSolarPanl
Glass - j35.us/100w-100-solar
DIY - j35.us/DIY-Solar-cells
4) Where can I buy a Battery Management System? j35.us/Batrium
5) What motor does your VW bus use? j35.us/HPEVS-AC51-Motor
6) What parts do you use on your Samba? j35.us/eSambaProj
7) What is the best fuse wire? I only use 1/8w resistor legs j35.us/ResistorLegs
8) Why not use Supercapacitors?
A. Batteries work better at this time, caps are rare and expensive devices that are very good at doing things not needed for storage systems typically.
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Пікірлер: 218

@ibraheemrodrigues861 6 жыл бұрын

Me and some friends are building an electric go kart using 18650s, this is going to be very useful! Thanks for all the great work and videos you're doing on the topic.

@karlbartelt3939 6 жыл бұрын

Thanks again for keeping us all inspired to keep recycling. It was great to see you having a good time on holiday also :)

@Bob_Lob_Law 6 жыл бұрын

I've been waiting for a tool like this. This will save a lot of time.

@Pirahnaxxx 6 жыл бұрын

Nice reference to the rePackr utility. That helps a lot. I enjoy your battery videos on KZfaq most. The LIVE streams can be fun, but not normally as informative for me.

@timbateman5780 2 жыл бұрын

As always you make everything so clear. I wanted to find out the reason why I have to match the mAh of each battery and here it is.

@pulesjet 6 жыл бұрын

Damn ! I was thinking it was going to be pain in the Rump to Calculating what batteries would give me equal Cell Capacity. That Program took away the Pain. Thank You !

@kelvynbettridge 6 жыл бұрын

Great vid, suggest picking up any random battery then place it in the row it was assigned by the repacker

@FPVREVIEWS 6 жыл бұрын

that program does a similar task to the programs used by the airlines to calculate weight and balance for aircraft, to know how to load the baggage, and balance the aircraft, while making sure that the weight estimate is accurate. interesting. your channel is valuable as always! thanks, Jehu!

@pyronmasters 3 жыл бұрын

The builder tool is easy to use, spot welding was harder than expected, I built a 7s 15p pack (I wanted to charge 1 amp per cell) ended with a 932wh pack, still have to test to build another one. This video helped.

@quentinrufin4025 6 жыл бұрын

Thank you for mentionning this great tool.

@RossYoungblood 6 жыл бұрын

Love your production values. Music/Editing. Nice work :)

@bobs12andahalf2 6 жыл бұрын

Really useful, thanks! Going to try making a small pack for kids' electric car, this is exactly what I was trying to figure out :)

@milvolts1 6 жыл бұрын

And man I wish you had a step by step video. Looks pretty good.

@gwilkins712 6 жыл бұрын

I have built several packs and never use a BMS. They always fail and are a pain in the butt! I charge my packs every time with a nice hobby balance charger. The 52v packs I build are split into two 7S packs. I then charge each 7S with my dual 8S balance hobby charger. I believe investing in a good hobby charger will out way all the bad BMS issues I will have to deal with in the future. Plus the hobby charger allows me to monitor cell voltage and resistance which helps determine the over all health of the battery.

@MrSummitville 4 жыл бұрын

Well, you are using the BMS ( balancer ) that is built-in to the Charger. You have no BMS when discharging ...

@ProfBab 2 жыл бұрын

6:47 programming tip: if you want to find the cells faster, just sort them first

@imho7250 6 жыл бұрын

That tool should add a way to enter both capacity and resistance so you can build a pack that not only stays balanced during slow discharge, but also won’t let one brick sag excessively during high discharge. Sort of like one of your old videos shows how to do by manually grouping the cells and getting the high drain and low drain cells equally distributed while getting the total capacity of each brick as close as possible.

@fourzerofour7860 6 жыл бұрын

Great video! I'll be interested to know how that little BMS does.

@milvolts1 6 жыл бұрын

Can you put link for one of your videos, a slowed down dummy step by step version that shows me how to build a 36x 18650 batteries 12v pack. Or something similar. Or if you have a step by step video on how you built your Puerto Rico Emergency power case. I would appreciate it. Love your videos man! Keep up staying up.

@Shmade0304 2 жыл бұрын

I legit just made this pack lol watching this video on super slowmo didn’t know how to connect the balance leads so this was a great video on that ….your the goat 🐐 🙌🏽🙌🏽🙌🏽🙌🏽🙌🏽🔋🔋🔋🔋🔋🔋👑👑👑👑👑👑👑

@njfulwider5 6 жыл бұрын

Another Great Video! I like to add a balance cables along with the BMS, just incase I have to balance charge later. You have to be careful when using a BMS and Balancing if you have a charger that does more than .5amps per cell. If your charger does more than .5 amps, sometimes it will trip the protection circuit and cause the BMS to fail, unless you reset it with no charge. Some will allow you to just add a charge and it reset. But if you don't know after balancing and thinking all is good. Your BMS wont balance or protect the batteries. (not sure if this is normal Behavior) just my experience.

@Oneupthesleevecustoms 6 жыл бұрын

Exactly what im up to on my channel your an inspiration

@antoniogoncalvesb.pereirag8922 Жыл бұрын

Nice video , best that I’ve seen on the net .. Excellent explanation 👍

@franciskeithtylermasketer4354 6 жыл бұрын

Love the new intro and the ending

@darenschneider 6 жыл бұрын

Dude. You're a life saver. That app is awesome.

@MarkSeve 6 жыл бұрын

Love your work Jehu. Keep it up brother.

@thebackyardjunkerscientist7732 5 жыл бұрын

Wow man nice job on lettings us know about that site it well be very useful in the furture when i plan on making packs thanks alot

@quadcopterhobbyshansie_fpv5895 5 жыл бұрын

You could have pulled the balancing wire out of the bms instead of soldering en 2nd one to it! Tip for your next balancecharge with thw rc charger. Have a good one m8 love your work.

@JanSeewald 6 жыл бұрын

rePackr is awesome!!

@joshuabest100 6 жыл бұрын

Hi jehu i want to know when I charge my batteries they drop in voltage a little say 4.14v or around there is that normal they stay at that voltage and dont self discharge im just wanting to know if that's normal

@p_mouse8676 6 жыл бұрын

Btw, instead of the little resistors you can also just use wire on a spool. Copper, silver or other types of wire would work just fine.

@dejayrezme8617 6 жыл бұрын

Yeah curious. Or just buy fuse wire. It really is an aspect that "smells" a little about this channel. It would be nice to have a video on how to precisely calculate the needed wire length and gauge for a certain battery pack instead of guesswork. I mean it can be done.

@p_mouse8676 6 жыл бұрын

What do you mean by calculate? It's a matter of a few simple physics laws about wire length, resistance and dissipated power -> heat? Or the simple version, look what companies use and use that as well. A little to big never hurts.

@dejayrezme8617 6 жыл бұрын

Well yeah, that's what I mean. It should be simple calculation if you know how (I don't know how).

@tofush0e 6 жыл бұрын

www.powerstream.com/Wire_Size.htm I guess you could use the chassis wiring current load limit, which would make 23 or 24 AWG seem appropriate for use as fuse wire in a bus bar. This is assuming soft annealed, nickel-free, solid core wire.

@rndfixr4145 5 жыл бұрын

I think the idea is the resistors are easier to handle when you have to do the job a lot.

@elk3909 4 жыл бұрын

i see use have the green ming he solar charge controller. do you know its hidden setting to auto start after power disconnects?

@chipichopo12 4 жыл бұрын

Algún día nos tendrás que explicar todo tu montaje y tu powerwall , un saludo desde España

@P8FPV 2 жыл бұрын

I found if you line up your cells lowest to highest mah it's easy to find each cell you need

@leighamos489 6 жыл бұрын

Back to the basics, I have to do a 7S-12P , I have a 7S windows-android BMS to test on it and I am going to try a Buck-booster to give me 12-14.5V for my 5th wheel LED Lighting Circuit :)

@davidrensi737 4 жыл бұрын

Thank you ! Great teacher !

@dannydrgn 6 жыл бұрын

Where can I her those brass strips or can I use something else to weld them together

@Dangit-Dave 6 жыл бұрын

Which video of yours go over making this type of battery pack from start. Also do you have a video to understand bms boards vs no bms board? Thanks for what you do too. I've watched several of your videos!

@oneal3224 6 жыл бұрын

Should i use a bms when building a battery for a car? And if so how many would i need

@phizicks 6 жыл бұрын

You SHOULD charge the cells first and leave them alone for a number of weeks and see which ones self discharge to weed out the bad ones. Capacity checking isn't enough otherwise you end up with a pack that keeps discharging itself.

@geraldgrogan 6 жыл бұрын

I think he assumed you did that already. There are other videos that walk you through testing and sorting of the cells

@tomamerman7699 6 жыл бұрын

Phizicks the cells that self discharge would not be holding 80% capacity. Especially since the cell analyzers calculate discharge capacity. I guess if these cells were originally 2600mah and reading 1400mah then there could be a self discharge cell but if these are 1600mah cells new and reading 1400mah now there's no self discharge. That means the anode is shorted with the cathode.

@DIYTechRepairs 6 жыл бұрын

Tom Amerman i have seen many cells holding close to new capacity and still self discharging. Roughly up to 0.5% off all my tested cells have had that phenomen. Of course depends on source of the cells.

@njfulwider5 6 жыл бұрын

What about Restances??I have also seen the same but was able to catch this with Resistance testing. I like to resistance tested every cell, looking for the higher ones. those I typically find will self-discharge pretty fast compared to the other cells. Some people instead of resistance testing will just charge a cell and if it falls below 4V, they consider it bad. I have seen cell at almost full capacity, self-discharge with high resistances. Also if you have a cell with high resistance, and you try a measure the capacity by charging, instead of discharging, and you use something like 0.5amps. You will get a much higher Capacity than the other cells. Typically easy to find, based on them measuring 2800mah and the cell is actually 2600mah. The cell is discharging at the end of the charge faster than the charger cycles.(but I am a newbie, and these are just my experience with salvaged cells.) Still a great Video, but my only worry is using Brass strips, instead of copper? I thought this was a no-no? I had always thought he used copper?? I can find brass strips all day long at my local hardware store, just not copper. I have to make those myself.

@DJDavo013 Жыл бұрын

Did you put a load it? Like a watt meter? If you put a load on it and the current drops big time, 90% or more that the battery is dead though

@pltspemula 2 жыл бұрын

18650 battery that always intrigued me😁🇮🇩

@pakistaninoob7424 4 жыл бұрын

Please tell me can I use fully charged 4.2 v cells in the pack or have to discharge them to 3.7v .. as I don't have discharger

@gregorymccloskey9412 6 жыл бұрын

Great video

@ericspano4350 2 жыл бұрын

Very nice I think I will like that repackr site

@MrJob91 6 жыл бұрын

10/10 so much info!!!!!

@milvolts1 5 жыл бұрын

What part of the pack do the leads go? does the minus go on the lower capacity side of the pack and positive go on the more capacity side or vice versa. do the leads need to be on same side of pack or opposite or is that a matter of preference? please let us know

@emceh 6 жыл бұрын

If you give this repack tool more cells than you need in the pack the capacity will be way closer as it's going to discard cells that aren't good for the pack

@fourzerofour7860 6 жыл бұрын

Sweet, I didn't know it did that! I'll definitely try that next time I'm building a pack!

@pulesjet 6 жыл бұрын

I was surprised at how well the program could balance the cells.

@ipissed 5 жыл бұрын

Well that changes everything considering he has an official shit ton of batteries. I would also try to pick out ones that were closer to begin with.

@pulesjet 5 жыл бұрын

The Algorithm chooses the Highest Capacity Cells to start with. It would be cool if they included a Bubble Sort program you could use as well.

@dunukic 4 жыл бұрын

Hello, do you have to be careful about the internal resistance of recycled li ion cells? Only use the ones which values are close to one another or it doesn't matter? Because some bms are designed to ballance new cells and those cells have pretty much same internal resistance? Greetings.

@noobz5056 3 жыл бұрын

Can you use electrical conductive paste adhesive (silver content) to connect the batteries instead of wiring? Have you tried this? And what was the result for you? Thanks

@TheEder28 5 жыл бұрын

Friend good night, what brand of BMS would you indicate to make a bank of batteries ?? Thank you, I'm from Brazil and I'm following your channel. Although here in Brazil electric car are very rare!

@robr3978 6 жыл бұрын

Thanks for this!

@246jonhy 5 жыл бұрын

That is fantastic jehu

@gw3436 4 жыл бұрын

Just used repakr for my first 3s 10p pack , take a look in KZfaq for it with fuses and in a coke bottle lol so I can see when fuses blow if they ever do lol

@iam_ambrose 3 жыл бұрын

Is it still ok to use the Nickel 18650 strip instead of the brass strip?

@davidallen4603 4 жыл бұрын

Jehu, Love watching your videos 👍 I want to make my packs modular like you have for my powerwall. My question relates to the BMS for each pack. I was planning on 7s10p packs/modules, with 7 of these modules in parallel to dictate overall capacity. The plan is to set up in a way that I will never draw more than 0.5a from each cell. In your opinion what amp rated BMS do you think would work best for each module?

@e3castillo 6 жыл бұрын

Hi, What is the best 18650 battery out there right now? I want to tinker and learn to build my own system.

@theredredstonesolar4996 6 жыл бұрын

great video :D keep up the great work

@kylequerijero1002 4 жыл бұрын

How do I know which cells are flipped negative up and then positive down?

@KillerkoUK 3 жыл бұрын

Can you use any capacity cells with this? Or you need to stay close even with this repackr way?

@invictusfarmer7188 Жыл бұрын

if i have 1000 cells in each 3.6volt pack will i need to do this if all of my cells are between 2400mah and 2700mah? total battery size is 7s1000p. how forgiving is the capacity on large power walls. or should i very carefully balance each pack by tested mah?

@alitonoliveira1700 5 жыл бұрын

Awesome!

@FroztiProductions 3 жыл бұрын

So the rated drain of a battery doesn't affect capacity if the amperage isn't pushed? Like I can use a 20c 2500mah battery with a 10c 2500mah battery if I'm not exceeding 10c per cell? They'll discharge at the same rate?

@constantinschipor130 5 ай бұрын

hii, what about resistance? As far as i know it has to be very precise, otherwise it affects the equalization of the cells.

@PatrickHRoss 6 жыл бұрын

You rock man!

@nelchan2421 Жыл бұрын

i'm planing to mix my 4 2200mah with 1 2150mah to make 21v is the Okay?

@wesleymarvelous1293 4 жыл бұрын

You are a hero man,keep up with the good work.za

@walttechnology 5 жыл бұрын

Sir, this battery pack you made, the issues I have always have with them is how to charge them.

@craigminca7446 6 жыл бұрын

I just did 1120 cells with cell pack man that was tedious., painful and took me all day. Lol

@jimhorrace6026 5 жыл бұрын

Hi Mr. Garcia! which bms would you recommend for a 20s20p pack?

@TomTheDutchy 6 жыл бұрын

Hi Jehu, thanks for another awesome vid. I wondering how relevant the accuracy is. Lets say you want to increase battery life and only charge to 4V and discharge to 3.2, looking at the discharge curve of an average cell that will give you about 10% less capacity but will increase cell life dramatically. When you test the cells you are dependent on the cutoffs from the charger, which will probably be on a larger range then what you would ideally want. I get it that you dont want to put cells 500 mah apart together but given that there is an error on the capacitytester(is there, have you ever tested one cell 10 times to see what the sd and variance are?) It feels like an overkill because there is an inherent uncertainty with these cells. What do you think? Thanks for the awesome channel!

@wallstreetdragon 5 жыл бұрын

That went over my head...... Whoosssh

@jimperri6405 2 жыл бұрын

good day i have Lishen (LS) LR1865SF Cell which bms can i use

@DiyintheGhetto 6 жыл бұрын

Hey Juhu onme thing how in the heck did you get the Bus bar on the the side without falling off?

@okan3644 5 жыл бұрын

:'))))

@KingofStreet3 6 жыл бұрын

Should I check the battery even if I buy brandspanking new 18650s??

@mauritsschoonderwaldt676 5 жыл бұрын

this only really applies for recycled 18650's. new ones from a TRUSTWORTHY source should be good, but if you buying chinese stuff you should test anyway.

@MrSummitville 4 жыл бұрын

@Victor Guillen - It is much better to find out that you have bad cell BEFORE you build the entire pack, because then you need to dis-assemble and re-assemble the entire pack ...

@onkarshikhare31 5 жыл бұрын

Can we enclose this battery pack in wodden container

@milvolts1 6 жыл бұрын

How would I get those 4 digit numbers to enter in website. Thanks. And do they all have to be similar or close to similar voltage.

@qcraft43 5 жыл бұрын

those number come from the Battery tester, you can get a Zanflare, or OPUS BT-c3100 and it will give you the internal resistance and the capacity ...there are many more bu that is what I have... I like the Zanflare the best...

@gugaboyz 4 жыл бұрын

I've been following your vlogs for some time and a month ago I wish I had seen this one.. But to be honest, I've done a better job than this site! 6s7p separated by 3mAh, yes, three!! 17735mAh /35/36/34/37/33 and 36.. Done the mats myself and I couldn't be prouder and happier :) Keep up teaching! Appreciate all your work.

@ismailgul9066 2 жыл бұрын

I have cells between 1700 to 2200mah capacity. can i use this tool to make battery pack out of them ? is this range safe or i should compact the range further please guide anyone

@Island_Times 6 жыл бұрын

YAY

@gianvanderbie2378 6 жыл бұрын

Hey jehu You can buy spotwelders really cheap on aliexpress (150$). Please try one out. I think it would be worth it because you make so many battery pacs. You can also buy the wire wich is used on the resistor legs.

@geraldgrogan 6 жыл бұрын

Jehu has other videos on using the spot welder. I think he owns one or two of them

@gianvanderbie2378 6 жыл бұрын

Gerald Grogan but why is he then soldering?

@jehugarcia 6 жыл бұрын

kzfaq.info/get/bejne/hZ-Ta7mjqNunp6M.html

@beratllapashtica3185 3 жыл бұрын

Hello can you answer for me please I have cells 3.7v end 3.6v from samsung Can i use together to build One battery

@paulkennett 6 жыл бұрын

You can tell Repackr.com to rerun it's algorithm on your list of cells and it will produce a slightly different sort result each time. So if the divergence is more than you like in the first result - you can just rerun the sort and (maybe) get a very slightly better result. The backend code uses a cool software technique called simulated annealing: en.wikipedia.org/wiki/Simulated_annealing

@drdronist 3 жыл бұрын

Hi , How did you manage Dead cells?

@ola9371 6 жыл бұрын

What is K & S brass strip model? Is it #8245?

@ShelbyGT5OO 6 жыл бұрын

8230 .41mm x 6.35mm = .016" x .25"

@eroticmasterbaker Жыл бұрын

Is it important how their discharge rate is arranged?

@1ken.cheniergmail 6 жыл бұрын

I love your video's bro but I would like to know if you have any that you don't fast forward thru the process ?I know that you only have so much time when making video's but I think that anyone that really wants to learn from you needs too see the whole process in real time without fast forwarding thru the process at all ...Thanks again for the great video's

@AKAL-ESH 3 жыл бұрын

Great information but felt like you fast forwarded past the more difficult parts at the end. Maybe I missed a previous video where you showed the end of the build.

@dadoguillermo4613 Жыл бұрын

Sir, where can i buy a 7s bms you used in your battery pack? 🙏🙏✌️✌️

@4d9peddinenivinaykumarredd90 5 жыл бұрын

what are exact kind of resistors???

@barkster 4 жыл бұрын

is it me or did he just cut video short. I wanted to see how he charged and test the pack

@anthonysanico1045 3 жыл бұрын

Hellow sir may i ask Can i join 2100mah and 1500mah in same pack?

@doittoday1 6 жыл бұрын

Jehu, I have a weego Whip electric car with 630 miles on it. The battery is dead. Do you have an alternative to the old batteries that I could swap out ? Thank You. Mike

@jehugarcia 6 жыл бұрын

pretty sure you can build it

@barrytaylor7365 6 жыл бұрын

Bro, thanks for telling us what's up with BMS/balance devices from on line sellers. I finished my 7 kwh powerwall-clone 6 months ago, without BMS's. I buit it from the 1S 20P packs that you used in one of your other powerwalls. They are all closely matched in capacity. I have since been trying to find BMS's to make it more balanced. I have bought 5 or 6 BMS's from different manufacturers, and have not found ONE that works 100% correctly. mierda pura

@ahaveland 6 жыл бұрын

Barry Taylor One word: Batrium.

@mareck6946 5 жыл бұрын

or check out the diyBMS if you dont mind getting your hands dirty soldering it.

@jamest.5001 5 жыл бұрын

Mar Eck do you have a link or info to diy bms?

@instinct022 6 жыл бұрын

I wish u have more detail info..while building pack..

@246jonhy 5 жыл бұрын

Cual es tu duda amigo? (What is your doubt friend?)

@jaywenden1939 4 жыл бұрын

Watch his other videos idiot 😂

@brandedpc 4 жыл бұрын

hi you didnt check the internal resistence of each cell while making pack. Isn't it Important ??

@jylimports 6 жыл бұрын

hello Jehu , I need to make a pack 19s 40ah for my scooter I need to know how many cells do I need thanks

@GuthrieDennis 5 жыл бұрын

I think the 19 in 19s spells it out for ya there fella. As for the Ah depends on the capacity and rating of the batteries your using.

@MrSummitville 4 жыл бұрын

@jose r - Do you have any cells in parallel ?

@abhinavr212 6 жыл бұрын

Where would i get 18650 for cheap in INDIA

@nelxonmiranda 5 жыл бұрын

What do you use to charge all that?

@diegooolB 6 жыл бұрын

Thanks! Used this tool for a ebike 13s6p pack. For powerwall modules, would 35 cells (7x5) as you have it here be the recomended pack size? Thanks!

@jehugarcia 6 жыл бұрын

Depends what you want to power, and the scheme you want run your battery at

@diegooolB 6 жыл бұрын

just starting here... my idea is 48v and have an "ever growing" powerwall (once is big enough, additional packs would work as replacement of "bad ones")

@MrUbuntu37 5 жыл бұрын

What is the best fuse wire? I only use 1/8w resistor leg !!! what is the ohm you are using it for 1/8w resistor ????????

@MrSummitville 4 жыл бұрын

The Ohms does not matter, the resistor is removed ...

@pulesjet 6 жыл бұрын

Don't just run with the first numbers RePacker comes up with. You can do a lot better if you do one run and then substitute the Flyers with better batteries and run the numbers a few more times like that. With a few runs you can get the Deviation number down quite good.