How to wire A DIY Tesla 18650 Powerwall
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- Опубликовано: 22 авг 2024
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I'm thinking of using a 24v inverter. with a max of 200a draw. and a max of 1amp per cell . and move up to 1/4amp eventually. I'd like to get 12-24hr run time without a charge. in case of a emergency. thank you for being a great help and motivation to get this project going!
parallel cells don't need to be balanced as they are at the same voltage all the time
series cells have to be balanced as they can be at different voltages while charging or discharging or just resting
another good video thanks Jehu
+Eren Berberoglu ah thank you
Failing to balance individual cells is likely to result in shorter pack life but as long as the system is well maintained by someone who knows what they're doing a BMS isn't essential.
Unfortunately _most_ people don't know what they're doing and don't understand that overdischarging Lithiums is even more dangerous than overcharging them - especially if left on a shelf for years afterwards.
This is why thermal management of large packs is so critically important (automotive or stationary).
I work in a university computing environment and we get a steady stream of people coming through with swelling battery packs. The wonder is that there are so few fires.
NiMH are not much lower in capacity but _much_ safer. The problem there is the patent encumberence of NiMH for automotive use in the USA that's essentially stalled most NiMH research for the last 30 years. (There's a wikipedia article on this(*)). Some of the patents have expired but others are still in effect and have been aggressively used to keep NiMH out of cars (Toyota have encountered major problems with this, trying to keep the CA electric RAV4s on the road).
Don't forget: For best longevity, Lithium batteries should be kept within 30-80% charge range with only occasional excursions outside this envelope. The reason for that is that the anodes physically swell and shrink with charge state and eventually disintegrate(*). If you're building a powerwall it's best to trade off the size with this compromise and for automotive use treat 30% to 0% as emergency reserve.
Bear in mind that overcharging or overdischarging can both result in lithium metal being deposited inside the cell and if that forms in the wrong location, puncturing a seperator, you WILL have a localised heating problem and fire on your hands(***). Make sure you house your powerwall in such a way that fires are containable or you may void your building insurance.
(*) en.wikipedia.org/wiki/Patent_encumbrance_of_large_automotive_NiMH_batteries
(**) There's a lot of R&D going into combatting this and when you see batteries marketed with 10,000+ cycle capability you'll know it's essentially solved (there is some progress but the tradeoff at the moment is vastly reduced capacity compared to "standard" cells)
(***) The lithium crystallisation issue is also being worked on but is in no sense a solved problem, so the best policy is to avoid excursions below 10% or above 90% unless absolutely necessary and _never_ leave a cell stored in a discharged state unless you like fires.
I Wish all comments were structured like Alan Brown's here, Informative and pragmatic
Hocam farklı marka 18650 pilleri aynı paralelde kullanırsam deşarj durumunda düşük c deşarj değerine sahip olan piiler ısınırmı ? Yoksa aynı marka model pillerimi aynı paralel içinde kullanmalıyım balansı kaybetmemesi açısından ? Teşekkürler.
What a massive reply for the wrong answer. I agree with Eren Berberoglu
and jehugarcia, you dont balance ever cell!
You simply need to teach series and parallel circuit theory.
I can visualize the structure instantly and I admire your work and the inspiration to be a nerd.
By the way, you are a genuine nerd and that is a compliment.
Hey, first of all thank you for making such DIY project. Its really cheap and I'm really looking forward to make it . I live in Bangladesh and its a developing country . People here need electricity very badly and the government is not working at all. I think powerwall is efficient enough to serve a full house here 24/7 with solar energy. We don't have many electronic devices in most of the houses. And I have to mention that please do not skip fast the important chapters. Thank you.
Is there another GOOD channel that actually explains how
to make this? This guy is not good at explaining how it is done.
I liked the short history lesson at the beginning of this video.
I do not know if its just me but do you have a clear shot of the finished negative side to see the wiring set up. I just see a lot of positive views. I do appreciate your video.
Gaaaah you make me want to learn electrical engineering lol.
+Bevin Holder Cool
when you get a chance can you pleas give me your thoughts
Look into it. The stuff he's showing you is EXTREMELY basic when it comes to electrical engineering. And I mean EXTREEEEEMELY. I went into it and it was tough as balls.
youtube.
the balancing isn't crucial in parallel setups like that but at the same time it is.
they're subject to varying resistance due to the inherent resistance in all conductors, essentially you'll develop hotspots if you have inadequate cooling.
the cells nearest the bars will be utilized more than the cells further from the bar. the resistance difference may be small but these are meant to be charged and discharged continuously. at the very least i'd run four packs and have a controller switch which are being used and in what order to maintain even wear.
Jahu, Good video. One thing. While you dont need a BMS for a parallel pack. You should have a passive BMS which you do have . You have forgotten about it. All batteries are not created the same. Even in parallel. Its not as likely that one will go hi but it is possible for one to tank earlier than the others. Remember why you installed your fuses? Its your passive BMS. It was a very wise decision on your part.
Should BMS stand for Battery Management System or Battery Monitoring System. The Fuses are a Battery Monitoring System.
I have seen people building packs without the fuses and they seem to be asking for trouble. The fuse stops a cascading effect to the other batteries.
Good work
I wish I found your channel sooner. I'm definately making a "powerwall" for a gapahauk in the woods this summer, charged by solar, heated on SMS activation by a bitcoin ASIC! xD
Great video! For some reason, when I commented on your last video, I was under the impression that you had the cells wired in series & parallel in these packs. Makes WAY more sense now. LOL.
Thanks for taking the time to make this video. Visual learning aids are awesome.
PS... you have inspired me to start harvesting 18650 cells to make my own packs. I've been haunting local battery recyclers for about a month now. So far I'm up to about 180 or 200 cells. :)
What happens if one cell goes bad?
Does just one row go out? What is the quickest way to locate the bad cell?
Might there be a way to install components to make it simple to locate which cell is bad?
Great videos, thank you for your time!
I think I understand why you said you don't need to balance the cells. In parallel you should get the same amount of voltage for the whole group even if a few of those cells failed. Now if one or two cells fail, you only lose a few watt-hours, decreasing current output by a certain percentage. But if a large portion of those cells fail, then you lose too much power and might not be able to fully power the motor at full load. So the reason to balance the cell would be in case of a few cells or a group of cells failing you could easily find and replace them without replacing a full battery pack of X amount of cells. Unless you want to spend the time testing each cell individually when and if they do fail by taking the whole piece apart and testing each cell individually. Time consuming to say the least... If you don't care when or if the cells fail then yeah, I wouldn't worry about load balancing or some sort of system to determine if cells are struggling to keep a charge. But say you need to determine the health of your battery cells for longevity, it is a good idea for some measuring system. Just looking at current on a screen and saying you have enough for the load isn't good enough to determine the health of your system. In the short term maybe, but as the cells age each one will fail at a different time and you will be paying for this mistake in time it takes to find and fix the problem.
Nice video! Just for the note - electricity can be and is produced by the renewables and can be CO2-zero in production, which is not the case for regular petrol.
Looking forward for the BMS video! Do you think you could also include the overview of the available BMS systems ? As a DIY enthusiast of a PHEV cars, it took me a while to find a good BMS that supports my battery pack parameters.
Good luck!
Hey Jehu I'm a big fan of your channel, in fact I liked it so much that I just finished binge watching the entire Samba series over the course of three days. You have connected a number of passions of mine, namely classic air cooled VW's and living in a more positive way in terms of the environment and how we interact with each other. I am a little bit confused about the end of the series and the 'Tesla' wall. It's cool to have some back up batteries and an inverter if the power goes out, but isn't the whole purpose of the Tesla system to save energy. Even if you install an inverter/charger, you will have a system that is less efficient than just using the 120 AC when you have a need for it. Without alternative energy input or a controller that charges only when electricity is abundant and re-introduces it into the 120 AC system of your house/shop when demand on the grid is high, it's really just a battery on the wall or am I missing something? Don't get me wrong, I truly love the videos and am inspired to start an EV project of my own when finances allow, however I would love it if you did a video on the source of the electricity that you use and what the actual footprint of it's consumption is. These are real issues here where I live in Canada where we are known for our oil sands projects and where right now indigenous people and environmentalists are being arrested for protesting the construction of North Americas next mega hydro dam, of which some of the output is likely to be imported to your state. Keep up the great work and I'll keep watching...BTW, I live completely off the grid with solar panels and a micro hydro plant running off a nearby creek.
Yeah all those are possible, buy and charge when it's cheap, use energy when it's peak rates. Charge using solar, use at night when no sun. Battery can be used in many ways
You are my favorite content creator. Your videos and vlogs are inspiring and informational. It's good to know that good forward thinking individuals exist in this world.
Seriously, your videos are fun and very motivating. I'm attempting to convince my local Ham Radio & Electronics Club here in Australia ( GGREC ) in Cranbourne to build one as we are getting ripped off by the power account management company's. I say account managers not supplier as they are what I call " Bulltish " company's that don't actually do anything just take your money. They don't recognise that we are 'Not For Profit' and charge us at company rates. Well, that aside I truly enjoyed your vids and by the way. Your editing is so smooth, nice job. Keep up the great work, regards from down under.. :)
Per your comment regarding where the Tesla gets its power from, you said it comes from coal. While that is a popular saying, "the Tesla is a coal car", it is not entirely accurate. California derives only about 20% of its power from coal, while the rest is: 46% natural gas, 14% nuclear, 11% hydro, and 11% from renewables. Even then, if you want to look at it from an emissions point of view when compared to an ICE, it is still a vastly cleaner and more efficient power source due to the fact that the power utilities can run at near peak efficiency for ~80-90% of the year. An ICE never operates at its peak efficiency, 18-20%, since it has to brake (bleed energy as friction) and re-accelerate over and over again in city street traffic, and even has to idle when stopped in traffic. At least with electric motors, you can build in the capability to recover some of the energy that gets wasted when braking. Overall, the ICE is a poor choice for being an energy efficient device.
So, in getting back to how this can relate to your work and your projects, you should be happy in knowing that the energy you're storing in your batteries is being generated in a much more efficient and economical way that the technology you're seeking to replace. That is why electric vehicles are better off in the long run than ICEs.
Sparks everywhere..until I watched this vid. Thanks!
Some calculations for people looking in comments.
1 cell = 2 ah x 3.7 v = 7.4 wh.
3 cells in series = 7.4 x 3 = 22.2 wh.
6 cells in series = 7.4 x 6 = 44.4 wh
I like the Vlog/Samba hybrid video.
I understood what you were doing in the last video, but thank you for the update.
Hi Jehu, I'm a local videographer and these 18650 batteries made me wonder if I could make a much more powerful V-Mount battery. The shell costs $60 online, and I have powerful LEDs that could last quite a while for less money using what you've demonstrated. Have you ever considered making your own batteries? It seems like 18650s are the foundation of everything haha.
+Jeremy gay Yes, I promised my My friends I would build a battery that would last all day for their rig ruclips.net/video/qxfUdF5gOeM/видео.html I use them for all kinds stuff these days, I wanna make one battery to power my macbook for a few hours to edit on the go
+jehugarcia I don't know if you're familiar with ChargeTechs portable AC outlet, but it tops out at 85W and they use Sanyo batteries and they look like 18650 batteries. Anyway, I'd like to support and learn how I can make one, do you have a link I can help out?
If you would like support our project by donating, you can use this link:
j35.us/helpwithcash or by using
patreon www.patreon.com/jehu
+jehugarcia thanks, will do.
Hey Jehu I've sent some pics of my solar lithium house in your Facebook chat please take a look when you have time. My parallel is 350s. Also Happy new year.
and finally it is much clear the idea after watching your very informative video in a short time... amazing explanation
I am so impressed. I love listening to your Vlog. I own a TESLA model S (P85D) and contemplating building my own Powerwall. However I have to come up with some Solar power. Any recommendations? or what would be a good solar panels. Where do you get your parts to build your cell for the batteries. I was thinking about sourcing my part through ebay. IS it s good idea?
That was a great explanation. I want to build my own Tesla Power wall and really like the way you explain things on your vblog. My question is what used laptop battery pack should I look for? Other vblogs show charts with LG, Samsung 18650 batteries as the best but most of the laptop battery packs I see on ebay are for IBM, Toshiba, Dell, etc. And buying 18650 batteries out right on ebay runs about 1.50 to $3.00 or more per battery and I don't know which of the ones are good? So which laptop batteries should I look for to get the good 18650 batteries and advoid the cheap ones that have lower capacity so that I don't waste my money? Thank you Jehu
Isn't better to add balance cable leads to the last battery in the pack not the first? It seems that all the time first battery on every pack is going to dry out first and charge first. Or is it better to add balance leads to every battery with same cable length and then connect them all to balanced cable?.What is better solution? Thanks :)
LA had one of the most extensive light rail systems in the world. Look up the GM/Standard oil conspiracy that destroyed it. :(
Hiya. You have nice idea to save money. I think easy will be if buy car battery. No need to play and will work good...
how are you Sr
I am Indian you working is a
very good idea Sr
I think your videos are great...you keep the topics light, fun and sometimes throw in some quirky humor which is a good formula to keep you viewers hooked. Keep up the good work.
As for the ignorant people that leave you unhelpful or moronic comments, I am of the opinion that you should just ignore them or leave them one word responses; nothing is better than watching someone like that self-implode from your lack of attention. When I started my electric vehicle journey, which included fabricating my own liquid cooled controller all I got was negative remarks from my friends. Now I zip around in a BMW i3 and those same friends have to tape their jaws shut as I whip that torque monster around town.
I would like to to ask you about your soldering of cells. I think I see you use more than one soldering iron at the same time to overcome the heat absorption of the battery. Is that correct? I am always worried about the violent nature of LiPo batteries when they fail. I am not an engineer and I cannot even say I am sure how these cells are constructed but are you ever concerned that the heat from the soldering guns could damage the edge layers of the batteries? I saw a few tack-welders for batteries under $200 bucks on ebay. Is there a reason why you don't use one of those? They look like they could easily be modified to create a handheld tacking solution.
I only wish I lived in your region. I would have loved to do some collaboration work with you. Keep on "Riding That Lightning"
In a 24v dc inverter you might be better of using 7 in series and as many as you can in parallel. This way you do not need to charge the 18650 upto 4.2v. You can charge up to 4v only. This will mak2 the batteries last a lot longer. So 7*4=28 V Then you do not need a charge controller if you charge from a set of 250w panels with Vmax 30v. There will be a voltage drop from the wire and the reverse current diode that will make the voltage just right to charge each 18650 up to 4 v only. And as you charge each cell to only 4v and not discharge it to lower than 3.3v then you do not need to balance anything. This is because you do not stress the 18650 cells.
To get the kWh you want then just increase the number of cells in each series.
+Martin Bennett Well since it is a stationary application so the energy density reduction to 70% as you say can be overcome by increasing the number of cells. So instead of using say 1000 cells we would use 1500 cells. I used used old laptop ones and run my house in Egypt. I don't even know what the capacity or nominal voltage of each 18650 cell. I simulated the capacity of each 18650 cell and found that by mixing the nominal voltage 3.6 and 3.7 it makes no difference as the total number of cells tends to infinity. Of course I do not have an infinit number but as the number increases the end result is almost the same as if they are all have the same nominal voltage.
Damn dude, just stumbled across your channel. Just watching this makes me feel smarter. I'm watching a marathon catching up. Firme ass samba. Allí te watcho. Keep doing your thing.......
Thanks for the info. I am interested in making a solar charged battery system for a few devices in my home.
Excelente forma de aprender un poco mas, realmente me motivaste a crear mi propia batería tipo Tesla.
Saludos desde Chile
Good job Jehu, KIS : Keep It Simple ;)
One Question - Shouldnt your positive and negative bus bars be on opposite sides so you pull the voltage evenly thru the batteries. With this pack setup, someone demonstrated more heat build up closer to the top the busbar as batteries were discharging faster than the batteries furthest form the bus bar.
The last part is missing audio, if you didn't notice.
Thinking about making a electric tricycle. But also making it street legal to a point. Like the vids keep it up.
thanks you that really helped me to under stand how a 18650 battery pack works :)
Love your project, nice DIY teaching, thank you!
yep you're right its the best and easiest way to it
Love your videos man keep up the good work.. knowledge is power
Greta work! Amazing info and LINKS! TY for taking all that time to do this. That's VERY much appreciated. Peace!
Ques 2) Since your batteries in your battery packs are parallel, they can't over charge and can't be discharged to zero so they all last the same amount of cycles? Since some of these used laptop battery packs have been in use for years we can't be certain how many charge/discharge cycles are left?
WHERE DID YOU GET THE HOLDER FOR THE BATTERIES... I DON'T KNOW WHAT THEY ARE CALLED BUT YOU HAVE THE BATTERIES SITTING IN THEM ON THE TABLE AND YOU TURN ONE UPSIDE DOWN TO MAKE IT A HOLDER BEFORE YOU WIRE THE PACK TOGETHER?
Hello from Puerto Rico so thats one big cell of 3.7 volts and for to reach 12v i would need to make 3 or 4 packs of these and conect them in series but my question is if i connect them in series the watts hour will increase to?
Thanks jehu for inspiring me during this crisis!
+Emanuel E. Muniz Rosado yes you had watt/hours
Thanks jehu i will try to see you when ypu are here in Puerto Rico big thanks
Thanks for this video.
But if all the batteries are connected in parallel then, how are going mount a 48volt inverter on a battery that's just 3.7 volts?
Cause you a Israelite man you know this cause God be with you. Man enjoy your things and dont let nay sayers run nothing. If they worked as hard as you they would know why or why not too.
DEUS VULT
very good video. Nice job explaining it. I will show this to my students I think it's very helpful.
Thanx for the video .. can ya help me out with a semi truck battery I would like to replace my batteries …
Love your videos, if a cell in the center of your large pack goes out what would be the steps to fix that? It seems like you would have to unsolder almost the whole pack to get to one. Is this true?
You may have answered this question a ton of times, but what do you with the dead batteries???
I wonder if a diode tree can be used to keep multiple banks balanced.. without any EC chips... but still allow the banks to be in series.
So I need some clarification. That big pack with the pink cells, is completely arranged in parallel with a + and - bus bar at the end, right?
So I could use 3 of these packs in a power wall for 12v, have one big BMS unit for all 3 packs then invert to 120v ac?
@2:24 on video... How exactly did you know that the voltage was 12.6 and the nominal was 11.1? where exactly do you get the nominal voltage from?
4.2 x 3 =12.6v
3.7 x 3 =11.1v
3.0x3 = 9v
Why don’t u make a solar battery pack to run a/c home now the California sunny day are coming and the electricity bill get hight sometime just to run a A/C
I use the 18650s for my own LiPo packs for my long range FPV hobby.
My comments are safety related. These battery packs are extremely flamable. Battery fires are extremely hot and way too common.
My suggestion would be to not try and copy Tesla because I believe the Tesla design exposes your home to fire risk. I would suggest making a fire box out of brick and mortar, and storing the cells in that. Not as pretty, but a house burned to ashes is even less pretty.
Perhaps you could use fire board instead of bricks to keep a lower profile, but I would use an abundance of caution when it comes to this. The batteries aren't cheap, so maybe even isolate each pack. That way if one burns it doesn't burn the others.
Finally, not sure if it was mentioned in the threads. Watch out for cheap Chinese knockoffs of these batteries. Most of them fall very short of their claimed capacity.
If anyone has or is a supplier of refurbished or reclaimed LG/Panasonic or other recognized brands please send me a private message. I want to buy.
I'm really wandering. I understand why you don't need balancing on parallel cells. But my main concern is the following; If I have 10 cells in parallel and one cell fails and would create a short the surrouding 9 batteries will discharge all there energy through this one cell. How do you prevent this and what is the safety if this would happen. Perhaps this rapid headup could damage nearby (other) cells causing a cascading effect. Any idea??
can you charge your car using (solar) with your battery or run a 1000 watt grow light for 18 hr. using your battery ?
What is the capacity and voltage of the pack you built? I still don't understand why it doesn't need to be balanced charge. My understanding is that if the batteries are connected in series I have to balance charge them. For instance how can I arrange and wire 10 NCR18650B to get 14.4V and not need to balance charge them. I think a smaller pack would be easier to understand for you viewers.
Thanks for explaining. Thumbs up.
From my calculation you better use 7s for 24v if you want to use an inverter, because the inverter cannot usually handle the 18,x volt of your 6s when it to the end. Am I right ?
If I had four of the all parallel battery packs connected in series to make somewhere around 12 volts, would a regular 12v charge controller be okay to charge the batteries or is there a specific type of charge controller for these types of batteries?
Sadly not a daily Vlog. But at least we got dinner.
+Darin Bicknell its more like every other day vlogs
+trever pitts I'll take weekly.
its still good to see him making a good video
hi can i ask something please
for every x3 (18650) batts you get 22.2whr
one 12v 100amp hrs leisure batt = 1200whr / 1.2kw hrs
1200 / 22.2 = youd need roughly 54 batts to be equivalent to 12v leisure batt is that correct?
So if i bought the 18650 batts for £1, coupling, copper ect it would cost me around £70 YET the leisure batt would cost me £56 ... whats the advantage of the small batts please?
Also how would know if one of the small batts died, and how to find it?
All the best, thanks for your videos... theyre great
Thanks for the information jehugarcia.I'm inspired to create a powerwall for the bus i'm currently rebuilding.In your explanation (12v system) you wrote 2 x 3.7 = 7.4wh without mentioning what this was ?? Can you enlighten me please ??
Watts = voltage x current, so his batteries are probably rated at ~2000mAh, or 2Ah. Watt-hours would be voltage x amp-hours, or 3.7V * 2Ah = 7.4Wh per cell.
Thanks Jack. I spent 8 minutes in the comments section hoping to find this info. You are the real MVP
Does the finished product need to be cooled in some manner to prevent overheating?
Where do you find so many old laptop batteries.
My biggest problem is sourcing the material!
Thanks!
You should do a video on how to find which 18650 batteries from ebay are good or not.
GOOD JOB
Do you have LED lights installed in your VW so if you have to run them at night they use less power?
Yes
Awesome video, had a question. I’m starting to harvest cells. What size/style battery pack must I create in order to use this battery for future purposes. Like powering my home and solar charging.
Sets of 3.7v packs, or 12v, or 24v
I feel safer making 3.7v packs and wiring then in series later, but please let me know your thoughts
Chido video bro, tienes alguno donde hagas la bateria???
Stupid question...do all the cells need to be the same mAh or does that not matter as long as they are all 3.7 volts? Also, how do you like the chevy volt...thinking of getting one.
If you were to take 6 of your 150 18650 packs and combined them to make it a 24v battery that has 900 18650 would you need a BMS?
a question , i was looking to build a power wall , though just for 250 batteries it's $750 australian dollars buying from USA shipping to australia, so roughly $1600 for the batteries (600 cells) the tesla power wall is $5000 aus dollars for the system with 10 years warranty, so im thinking with the time and effort i would be better of just buying one straight up , or what do you think?
That makes sense when you charge, but when you draw, doesn't that mean that the resistance within the batteries can cause an imbalance?
Question! Around 6.35 in the video you show us the finished battery pack. As far as I can see you've got 20 cells in parallel and 7 or 8? in series. Sorry can´t figure this out, but there seems to be a fuse connection on both sides from brass strip number 7 and 8 (from the left). WHY? :)
Hey, can you use RC batteries with a 3S bms in each pack to build a power wall?
Im really confused here... what voltage did you wire you power cell to run off? I thought US households used 120v's and all appliance were setup to run of those 120v sources.
B.M.S B.S. in some cases correct. as long as you keep an eye on it . and charge properly. correct? wouldn't it work better to go with 7 cells in a 24v inverter setup? it would be closer voltage range. like when using lead acid batteries. I think a 24v inverter can handle 29v. and if you only go to 4v you are only at 28v much like a alternator would put out in a 24 v vehicle. and the inverter may be more efficient . its easier to convert a higher voltage to a even higher ac voltage. sorry I'm rambling again. but I'm wanting to go with a 24 v system for my off grid home. to get off the generator. using solar and hydro to recharge the batteries
Nice info
If you took a series of 4 batteries to make 12 volt (14.4 volt) could it be used on solar setup for power in place of regular batteries
Cells in parallel have same voltage but can have different current.....cells in series have same current but can have different voltages
can you make another video showing how to solder this together with the fuses and copper bus bars exactly step by step?
For a 96v system, is there any reason you cannot use two 48v BMS's - one for the first 48v and one for the second 48v? I'm looking at building a 96v system for a racing kart so peak current is import (end of straight max rpm WOT), and I want to make sure it doesn't fail.
Hi, great videos!!
Where do you buy the black plastic holders for the batteries?
+Nikolaj Kjær Nielsen
18650 Holders j35.us/18650-spacer-clips
I am just a little confused. In this video you showed wiring a 12v cell. correct me if im wrong but you put 3 cells together in series and then put 50 cells behind each of them in parallel. Right or all of them in parallel?
Correct
I want to build a what you showed on this video, do you have a more detailed step by step instructional video with list of parts and where you acquire them from?
No
Typical Mexican
Hey hermano, ¿cuántas baterías se necesitan para hacer la "Mega batería"?
Question, I have a server rack that uses 4kw. We are prone to power outage in my area and at the point I rather conduct a battery array (like what you have here). How many batteries would I need to use 4kw every hour for a whole day? Thank you for your time sir.
+grimthereeper I think you would need 22 of these units. 13,200 batteries. If you could selvage at same rate, 30c a pop, it would be $4k + $1.5k for inverter and bits, a total of $5.5k. What about using a 100kw diesel generator? I see them new for about $20k, and used for around $10k. Do you have frequent 24hr outages?
You mix chemistries? I thought you couldn't do that... (your samba comment)
That's cool for 12v /24v... Not sure what I'd need that for but cool info.
As far as bms, yea you don't need it as long as you keep an eye on it. But I don't get why you said they wouldn't come out of balance... Of course they can... That's why balance chargers exist... So you don't need a bms but you still need balance leads. A new wouldn't notice the fine detail that all the cells you are talking about are a parallel connection.
How you should have explained it for newbs is that all series connections require 1 balance wire per set of parallel cell arrangements (from 1-infinity). While parallel cells themselves don't require balancing since they self balance.
But once you start attaching parallel groups in series, now each group of cells becomes a series connection and each member of the series connection requires a balancing lead. (also the entire arrangement's negative, that needs an extra wire on negative. Hence why you need 6 wires on a 5S connection)
I have a question. If you are running 12v or 24v inverter, shouldn't your minimum voltage be 12v or 24v. I cant run my inverter under 11v
I really like the idea of electric cars once you're off grid you can fill them up from your house. But I just hate the sound of electric cars a good V8 motor sound so awesome that's a tough one.
Hello there Sir, I have a little doubt here So for this type of Balance Cell connection do also required an BMS to charge and Discharge the Battery , looking forward for your reply sir , Thank you
Question: I see many different mAh listings for 18650 batteries... is there a good reason (i.e. endurance /lifespan) why you are using 2200 mAh? I have seen listings for 6000 mAh 18650's....
I'm new to this so am looking to cut my cost/learning curve... any help is greatly appreciated!
Quick question would you suggest using a glass fuse.5A to connect to busbar