Designing the perfect DIY battery pack out of 18650 cells - Battery talk #3
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- čas přidán 27. 08. 2024
- Lets talk about batteries Part 3
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These are exactly the vids I was looking for to design an e-bike cell. So thanks! Still watching.....next vid!
I really like the outro music on this one. Smooth.
I only need two batteries for my circuit I'm working on. Two in series. 8.4v. My circuit uses a Op-Amp as a voltage comparator for the ldr & vres. But the panel would go through a buck converter cc cv first, then though the 8.4v 18650 batteries and the buck converter would stop charging at 8.4v.
You are doing a great job, sir. I appreciate.
amazing and easy explanation.
I'm a second year electrical engineer. I almost watched all of your video. really nice. I wish we meet one day.
Thanks Jehu! I'm learning much more with your vids!
I missed the start of the live chat yesterday with the answers to my questions. You also pulled the live chat intro video I had my questions on
thank you for your awesome videos. I really enjoy watching them, very inspiring.
I live in the florid keys and I remember the mess with puerto rico
going to try and mod my mag light with one of those!
I used 35C batteries for my electric longboard project, though I want to try a new version using these cheap recycled cells.. hmm, interesting video man!
Just want to add that the lithium batteries have 30% or so more usable power than the lead acids. Not sure how his controller cuts the power when voltage drops but he could get the same usable capacity with a smaller lithium pack.
+P Roppo sorry, wrong video, meant for the scooter project.
Thanks for explaining it in laymans terms so that us mere mortals can understand. I'm now starting my own battery pack. Cheers :-)
Jehu, I was thinking of the fused design some of you guys are doing. If you built a parallel pack that is 50ah in size and had a fuse or two blow you'd now have lost some capacity. But if you start out with all your parallel packs bottom balanced and then have a fuse or two blow wouldn't that kick that parallel pack out of balance with the others due to the capacity loss? If that was the case then you could have some issues of a poorly bottom balanced pack. We know what can happen with that. Seems to me that the method you guys are doing would be better suited to using a BMS and have it more or less top balanced and controlled by the BMS. What are your thoughts on that? As long as no cell is lost then the system works in a bottom balanced setup.
Hey Jehu could you please help me? I need to stop my lithium battery pack from sparking when I hook up my second battery to my mobility scooter. It's only 15 volts for each battery pack... Please help man.. I know you help and talk to a lot of people but you helped me out a couple of weeks ago on building some battery packs for my 24 volt electric mobility scooter.... So thanks so dang much cause I'm so dang tired of replacing those stupid, a so heavy 12 volt deep cell batteries....
btw the Sony-a7Sii must be great camera!
I have the Sony-a7Rii (the high-res one) and it is awesome!
Though if you're not in a hurry and can afford last-models, Sony are going to release the III-series of these cameras in the next few months - probably worth the wait.
Wierd and complicated question:
What would be the simplest and foolproof way of charging multicell packs without bms?
fig1
charging each cell array from separate li-ion charger eg 4 cell arrays in parallel >> 4 chargers in parallel acting as a dumb bms (all charger are finished charging at 4,2v , the battery is balanced)
fig 2
one big biffy charger accommodating all the cels in the whole battery pack, and no balancing whatsoever. Only periodically manual voltage checks and so on.
fig 3
disconnecting the series connections and reconnecting all the cells as a one big array, and charging them as a "singel cell" allowing for self balancing.(the problem is the current of charging here)
fig4
Charging them as a series battery pack and periodically balancing them manually by reconfiguration as a "single cell" array
How did you get around the parallel strings and Eddie current problem?
Great information!! thanks man!!
Tienes estos tutoriales en Español somos muchos del habla hispana interesados en estos temas
cant wait for the next
Hi Jehu, I am at the beginning stage of trying to convert my electric wheelchair to 18650, at the moment it is using SLA and the batteries are very expensive and does not last, The first problem I have is how to determine the load of the motors, looks like the system is 24 volt but each motor use a 12 volt battery, the charger is also a 24volt charger, the second thing is cells, here in South Africa the 18650 cells are not so easy to come by, how can i determine the load please
You need a multi meter kit.com/jehu/diy-powerwall-building-essentials/aimo-ms2108a-auto-ra
@@jehugarcia i have one
Brother i love your channel
Quick question:
- should I connect batteries in series to get 12v or connect in parallel and use dc-dc converter to get the maximum maximum of my batteries?
p.s. your videos are amazing and changed my perspective to electric/hybrid technology. Thank YOU!
i want to replace lead acid batteries in my camper. Should i do 3 serial or 4 to get 12v from 18650?
It will be charged by solar.
Thanks. keep up with the good work
: Hi , im triying to make an electric longboard , with reusable 18650 batteries , wich i took from laptops , but i have many questions about their discharge capacity(Amps) that they can handle before been dangerous .
So i would like to know if you can help me with some info i dont think they could handle this much amps . thx
Clicking on "Play Next Video" doesn't work in Safari. Any ideas?
I was having some cranking problems with my diesel BMW last week and I was wondering if you could make a starter battery for a combustion car with 18650 cells? An average lead acid battery is around 80 amp hours, so 20 cells in parallel and 3 cells in series should be OK. Only problem is CCA. For the Bosch S5 85ah battery is rated for 800 CCA, so each batery will be discharging with 12 C.....
+Тони Иванов (Tony Ivanov) larger capacity would fix that, or you could just use lipo cells, they will give the power levels with out having too big of s battery
I want to store about 200 brand new 18650's for 2 years unused. What would be the best way to do this? fully charged? should I drain and charge them twice a year? Just best way possible to maintain maximum life. Thanks for your videos! I've learned a lot from you!
+TheMegaJerm 40% state of charge is recommended for long storage
+jehugarcia cool man. so just about 3.9 volts or so?
3.4V i think is what my chargers do for storage
+jehugarcia Link to the Saxophone music used at the end please :)
Hi jehu...could you pls send me the link to buy your book on battery building.. 18650
Thank you.
Jehu,
My question seems to be very newbie, but, how do i know how much capacity my 18650 cells have?
The voltage i can see with a Multimeter, but, how do i know if they are completely full?
Thanks for the attention, i like your channel and you are doing a AWESOME job with the project Samba (VW Kombi)
Well, if you charged a cell at half an amp for 4 hours it should be at 2ah.
So idk I probably didn't help but there ya go
I have a question. on one of your videos, you started you are using more than one battery chemistry in your samba. Is it possible to use LiFePo4 32700 and Li-Ion 18650 packs at the same time, and if so, how? Thanks, and I love your videos!
Thank you so much for your videos. I hope you enjoy making them as much as I enjoy viewing them!
I have a 2013 Ford Focus Electric (FFE) and will be using your videos in an attempt to create a battery bank which will be installed in order to increase the range of my FFE. I have some trunk space that I'm willing to sacrifice for a battery bank which will increase my range. My goal is to add 8kw to the existing 23kw.
I'm in the process of determining the stock battery setup. I know the FFE has 2 high voltage batteries, but I do not know if they are connected in series or parallel. I also need to determine the voltage of the two battery banks. I should be able to splice my custom battery bank into the existing battery bank. Any thoughts?
Thanks again for your videos.
Hi Jehu, do you fuse the negatives too or just the positive side. I'd suspect just the positive of the 18650 would do.
I love your channel and its topics. The only thing that bothers me a little, is your constant movement of the feet, it gives me a sensation of movement that makes me dizzy after a while.
great videos! awesome series on the 18650's!! Gracias cabrooooon!!! ;)
One question ...what do you charge your batteries to for continuous use?
Como estas? Gracias por todo lo que haces , de verdad es muy importante..he tratado de comunicarme contigo. Por favor tengo varias preguntas. Al cargar las baterías 18650 algunas se calientan. Estoy haciendo la DIY 600 baterías,4. 4 kw que hiciste . pero la verdad hacerla aquí en Colombia,no es nada fácil .te agradezco tu ayuda .
can you please talk about what motor you use, i cannot find a suitable motor below 4k
i`m trying to build a backup battery for a gps tracker unit. it currently has a 4x2 inches 6000mah 3.7v battery with a positive and negative wire coming owt of it. i removed the old battery as it was swollen . there is enough room for 6 x 18650 batteries. would you be able to tell me which batteries are best to get the best battery pack and how should i wire them.thank you
Hi... nice video thanks Jehu. Wanna ask you. I am having an oversized motor of about 13kw PMAC, but I want to 6-8kw power to be consumed max. Is 10-12kw battery will be ok for battery life?
HI, Jehu! i've been follow your videos about the 18650 cells for over a year now, and i LOVE your EV SAMBA, i'm learning a lot from your experience.
I want to ask you what are the soundtrack songs in your recently videos i got crazy for one( 00:35 for been specific) and I CANT find it. best wishes from Buenos Aires, Argentina!
i want to make a pack for the ups battery back ups for pc change out the stock battery for lith pack but how would i do that for the charging management do i need to put a bms between the ups and the pack or will the charge manager on the ups handle it
Hi Jehu,
what is your expectation about remaining number of cycles? I am also planning to use dead laptop batterries but I can't estimate how long will battery last. Number of cycles or years remaining can be interesting fact for people who decide whether to use older cells or new. Is voltage drop to 4.09 V after charge evidence of good condition of used cell or not?
I love all your work carnalito. I got a question I haven't been able to find an answer for. I look up to you for guidance. I'm making a monster 500w LED flashlight. The LED specs:
DC Forward Voltage (VF): 70.0 Vdc ~ 78.0 Vdc
DC Forward Current (IF): 7A
I was trying to use all new batteries but it's not cost effective IMO. I'm planning to make a battery pack of about 30 volts then use a step up booster. My question is, would you consider this putting the batteries under stress like in vaping? I just can't see myself making a pack of let's say 80+ volts (which would be a lot bigger) just to having to step it down... but if that really is the best for performance, I'd like to know. I feel like I'm navigating my way around in a dark room. Any help would be greatly appreciated.
Thanks,
a 2000mA/h 3.7V is 7.4wH, this mean I can get all this power from one single cell in a safe way
+Jose Garcia yes
I'm curious, are super capacitors good enough to use as batteries in the same manner that these 18650 cells are used? does the capacity drop over time like with batteries?
Nice....
How to charge my 50A 12V Battery if my cell only has 4A Max charging current coz I want it to charge for only 5hr
how do you make your packs the same capacity
Can anybody help me out? Do I need to consider li ion cell resistance when building battery pack from different recycled old laptop battery li ion cells?
Is it bad to use high drain batteries?
you would still need a protection cuircut per cell 18650, as well as the pack of 18650s in P,
like if u have 10P10S 10 in paralell and 10 in series and draw 10A from the pack each cell like you said will see 1A.
but what if one cell in the pack of 10 cells in P goes dead, the the other 9 18650 in the pack of 10 now draw 1.1-1.2A each, in a large config like yurs this would cause big problems if suddenly a bunch of cells die from temperture .. what have you, then instead of each cell only pulling 1.5A could jump up to 2+ A per cell causing a MAJOR FAILURE! lol love saying major failure. i have worked alot with large batteries along the lines of 18p12s and the best way to go is all new batteries and proper BMS and charging, smaller applications for 2nd hand cells.
Jehu, do you think Tesla use that rule of thumb; twice the KWh for the amount drawn or no because they're using new cells? Thanks :)
Hey bro, I have a problem with mine. I built a 13 cell battery for my 48v 1000w motor but the voltage ranges when charged between 48.1v to 54.6v (3.7v x 13 cells to 4.2v x 13 cells) so upon connection my voltage is too high, but then of course drops when under load.
I had a massive problem with my bike going up hills even with 8 batteries in parallel to get my amps per cell. The voltage drops too low and my bike cuts out.
So I decided to add another cell, and at 14 cells we have a charging range between 51.8v to 56v. You guessed it I smoked my ebike controller.
How do I deal with this voltage range especially up hills? I have over 100 batteries all around 2.2A wired together and still struggling.
Thanks!
Why did you decide on 130v and 650 amp for the samba ? Specifically what influenced your decision on the voltage ?
Dimitris Zarmakoupis Search Curtis 1238 specs
Will do, thanks for the quick reply! You're a legend man... great vids! Keep up the good work
I greatly enjoy your videos!
I'm complete newbie, and a day ago I needed to really focus to remember basic formulas from school.
But I'm motivated to do a small-scale project - a portable UPS for a mini-pc that I recently got (the Intel Skull NUC which is powerful workstation in tiny size - 211 mm x 116 mm x 28 mm and just over 620gr) with power consumption of 19V and up to 6.32A (ie 120W, though typical usage would be under 80W most of the time). Now I can use it w/o any problem with its PSU plugged in the wall-socket, but given it's ridiculously small size I was wondering if I can turn it into a powerful mobile workstation (with good battery-pack and appropriate mobile-monitor or even better pen-display-tablet).
However most laptop batteries are much weaker, or the ones for gaming laptops that are close to these requirements, usually last under an hour (I guess in order to fit within safety regulations like taking it on airplane...).
So I'm going to do this with new batteries (not salvaging old laptop ones). I've picked NCR18650GA (capable of 3500mAh 10A).
My needs are never going to be over 6.32A for the actual device (the NUC), and I estimate additionally about 1.7A for charging the batteries while running the NUC, which in the worst case scenario would nicely round to about 8A. The NCR18650GA capable of 10A continuous discharge would be operating within safe limits given that my actual need would practically never go over 7A /and probably 99% of the time would be under 6A for both charging and powering the NUC/.
So given the above type of cells, I'll need a minimum of 3p6s setup (though I think I'll go for 4p6s for higher capacity, given it would increase weight only by ~300gr and would give me almost an hour more of average use. I've est. between 3 & 4 hours for heavy or average use with a 4p6s pack).
Now I'm trying to figure out the rest of components I'll need.
1st - Obviously I'll need a PSU with standard 110-220V Input, capable of 200W (25V up to 8A).
I estimated I would need about 25V to charge the above 6s cells (6 * 4.2V = 25.2V), and most such cells have recommended charge rate of 0.5C or in this case ~1.7A (though I'm sure they can safely charge with at least 0.8C, but not sure how would that affect their life).
For now lets say the PSU Out Voltage is under question, though I think 25V would be appropriate.
2nd - I'll also need a DC-DC Voltage regulator in-front the NUC which should be able to convert both the batteries' 21.6V and the PSU's 25V to the needed 19V. That's the reason I decided on 25V PSU Out, because I would need a DC-DC V-regulator in-front the NUC anyway, so the PSU should supply needed Voltage at least for the battery charging (to avoid one more converter).
3rd - I'll need some kind of Dual DC Power Smart Selection Switch 2-Ins-To-1-Out (or fast and smart switching relay) /isn't there a shorter name for these?/ This is to allow automatic switch from PSU input, to the battery input, when the PSU is disconnected (as in a UPS). I still haven't selected such module. If anyone can recommend me one that can switch without power interruption would be great!
That switch-relay would be in-front the DC-DC converter from point-2 above, so it's INs would be 'A' (the preferred one if available) the PSU-Out, and 'B' the Battery-Out.
4th - I would need some Charging-Protector module between the PSU and the Battery. Assuming the PSU would give the Battery's needed 25V this protector should mainly limit the current (to the safe 1.7A for example). This charge-protector module would ideally protect from over-discharge I guess.
Now if the Charge-Protector can ensure that the weakest cell won't drop below the cut-off voltage (for these cells: 2.5V) during discharging, and the strongest cell won't go over 4.2V during charging - then balancing of the (planned 24) cells can be done (with a balance-charger @home) on a much longer period compared to the regular charging life-cycle (ie half a year I guess?).
And unsurprisingly I still have no idea of such charge-protector module :) (closest I've found so far TP4056 is charging at 1A), so again any recommendations are greatly appreciated!
Sorry for the long post! That's my whole project plan so far that I made for a day, and I really could use the help of people like Jehu, to save me time in seeking the needed modules, and correct my mistakes to avoid dangerous incidents! :)
So if you've managed to read it all, and have experience with building such portable DC-UPS modules, please comment!
And again, great thanks to you Jehu! All your videos I've watched so far have been very, very educational to me! :)
where did you get that celling fan from thats cool,,:)
hello just watched your video on how many cells do I need . I'm considering on a uk mobility scooter it's a 72 v brushless motor think it's a 240 v lead acid battery . is it possible to convert to a Ryobi drill battery setup as these are about 50 pounds Stirling . it only powers the motor no lights ext.I want to cut my teeth then eventually do a car . ps love the split bus with the Tessa conversion.cheers . steve
How long does your Samba last on a charge?
How many batteries do I need to make From the battery bank of 18650. For a system of 300 watts 12v three solar panels 6.3 AMP in parallel. I need help 🇵🇷🇵🇷🇵 🇷
cclyls will go back battery
Hey Jehu, Love your channel bud. What's the difference between 18650 cells and 17670 cells?
+Sandback Technical Design Inc. size most likely, 18mm diam x 65mm long on 18650
+jehugarcia That's it. I suppose they are an older design as well.
Where is the design?
are we going to turn off the comments on this battery talk?
I wanted to known if the imax was real or fake china one? in battery talk 2?
check the serial number underneath
also if you paid less than 40€ I think it would be fake
+BillTheBox I was trying to get to the point he mentioned eBay but nothing about real or China copy. And people should be aware that the China copies have issues with voltage.
Looking online it seems best way to verify is the hologram sticker on the back is the original unit.
Cam Shaft yes
and worst is that 4,2v can be 4,1 just as it can be 4,3v and it really isn't good for the batteries to be overcharged
Good info that I think was left out, that the China knockoff has very poor voltage control or accuracy. And if we are talking about treating the batteries with care over charging them isn't a good route. And worst of all you have No idea you are ;(
I took great plans from Avasva . It help me a lot with my own solars.
ah, screw the van, make an electronic unicycle....
what software do you use for your videos?
+vbernabucci Final Cut video X
+jehugarcia Thank you!
....Its roughly over a half C.....
afrotechmods has a good video but here is a fast explanation : one c is one time the capacity of the cells. if the cells are 3000mah then one c is 3000ma
if they are 2200 mah then one c is 2200 ma ( or 2.2 amps )
Just a personal opinion, but I find the background music repetitive and unnecessary.
disagree, the mild background music works for me.
im getting 40 new cells for about 45$
could you do the math on paper and show me, because some number don't match, maybe I'm doing something wrong
i have 9 of them that have dropped to under 1000 mAh. XD
congrats
Hello Jehu garcia great one, pls kindly check your facebook page
i sent you a private message there thanks.
Maybe the man know but may the videos too boring need inpruve the metodology.
Love you dude, but I wish you would stop jigging about, makes me dizzy watching your videos! Lol
hey +jehugarcia why do you bounce during your talk? it's a little annoying tbh..
Mostly to annoy viewers
+jehugarcia ha-ha no hate man, I sense sarcasm, I'm jw
Cool
are we going to see any powerwall updates soon?
+Gregory G Harding Yes, but not too exciting, I'm about to hang it in its new location, maybe I'll talk about the plan is moving forward
Two things SIr. 1. Stop bouncing while talking, sit steady and talk 2. Get rid of the annoying background music because people watch this kind of videos to get the technical information.. not to listen to the music..Frankly, I watched two of your videos and do not plan for any more because these annoying factors.. Good luck !
+Santhakumar Karolil one thing, Stop commenting
+jehugarcia You keep bouncing as much as you want buddy. Your videos are awesome. Screw the ingrates and haters