Pro tip. The other end of that multi-color ribbon cable will have tiny bits of exposed wire on the end. Even when flush cut. You want to avoid having the end touching anything.
Your heat sinking videos how and what can you tell me what you're using is it on an iPhone and adapter where can I get it thank you very much I saw you all the time whatever you need whatever I can do let us know thank you for showing us all the way it's very very appreciated manfishh@aol.com
Thank you for all the information I have been watching your channel almost 3 years now. Every time I watch I begin to understand a little more about evs or better pack build ups. Its been 2years of me looking for the perfect bike to build I will eventually buy one and source most things from you or sites you reccomend. I'm glad I didn't jump in it right away because it seems tech is coming up faster than finding a Hayabusa in my area at the right price. I started collecting old laptop batteries but with all the information you give which I greatly appreciate is becoming much easier. Mostly I'll come out with a better build. I thank you brother and speak many blessings on you.
I think heat shrink over the standoffs between boards might be a good idea. That way if you drop a tool or something you will not get a dead short across the standoff terminals.
Clumsy people should wear helmets everyday, but to suggest everyone use them is extreme. Sounds like you are accident prone, take the needed precautions to stay safe.
You can crimp the connector with a vice. Be gentle closing the vice and do not over tighten. When crimping a connector you feel a stiff resistance at first as the connector bites through the cable's plastic insulation. Then it becomes easy to finish the last 60% of the crimp. You do not need to give a final "tight" squeeze, it only damages the plastic.
LOVE your channel love what your doing with recycling the battery's, so much that I just ordered 6 battery's for my vaping mod. thank you for the great way to save money, save the landfill, and support a small business. YOUR AWESOME
Nicko Blicko look into HBpowerwall channel, and AveRage Joe for better, more consistent, reliable good info. Pete’s a great guy too (for a QLD’er hehe)
@@deanauzzieevans685 oh wow I'm just around the corner! Add me to your google I have a mate who does imports when I have the $$ going to make one of this guys systems. Small world!
It's like looking for old rusty coins on the beach when you can order pre-rolled never been circulated change from the comfort of your home. Reclaiming batteries should be like Folk Art it should understood but that's about all. No one wants old under/over cycled highly unpredictable cells everyone wants the new LG Panasonic Samsung cells. Why would you want recycle batteries when you can get 60+ Amp rated 21700/26650/3200P/32650 up to 10,000mah for $1-$13 each wholesale. Headway 10AH 100A cells are $15-$30 why are people dumpster diving for old batteries with a few dozen more cycles left in them... Maxwell 17v "SELF BALANCING" Super Capacitors modules which have over 1,000,000 cycles are $150 each from Mouser & Digikey and people loitering trash piles when it's trash for good reason seeing as It's trash compared to New(0 cycle) Lifepo4 batteries PCB balanced with Super Capacitors.
@@mindyabiznarc it sounds like a very small amount of money to you, but some people don't have that. I won't be dumpster diving, but I'm considering using batteryhookup.com for mine
What I don't understand is why he hasn't incorporated heat management into the system (A fan to turn on to keep things cool If they get too warm… To maximize battery life)
I like your idea to use multiple BMS systems. As they love to break... However running them at 50amps if one has broken. Anyway I'm planning to use multiple BMS on the e-bike battery's I will build
I am looking to get rid of 40 of these boards that I got from Jehu's Website. I don't know where else to market them because people don't know what they are or how to use them other than Jehu's audience. They are all already built, just need to add batteries. Let me know if you are interested. Thanks!
Amen. I’m not an electrical engineer I’d like to build one and install it using plugged solar panels. But also would like to not burn my house down so I need step by step instructions from start to finish
@@mrramz424 same here Mr. Ramz. Great video but should go step by step on how to set up everything to run. So dummies like myself don't burn down anything... Come on man teach us...........
Your product is great and i've had a blast building my modules and testing them. They work great!!! I would also like to see more about your suggested wiring connections to inverter and solar setup's. Maybe also some suggestions on inverter charge setup (float and bulk charge), low and disconnect voltages etc. Thank you very much for the channel and hoping to see some of these video's
Mr. Garcia! Could you make a video showing us how to charge these battery packs with solar panels? I am confused as to how to set up the parameters for the solar charger correctly. Thanks!
The BMS is doing balancing to each row of calls. To hook this up to a solar system all you need to do is follow a simple guide online and connect it to your charge controller. Connect battery to controller first then panels. Controller usually decides what battery voltage its at and should take it from there, if its a cheapo change its charge voltage cutoff and float for lithium standards and you guys should be golden.
Jehu, you should install a 13 kW solar electric panel array on your roof, build two or three DIY powerwalls with these pcb’s, so all your home and electric vehicle charging needs will be met, even during blackout and to avoid expensive peak power rates during high demand times of day?!
Thanks for the great vids & ideas! One question I had was is that matching the cell voltage really that important? I believe those BMSs have balancing functions on their own and if it doesn't the user can balance it via one of those BattGO systems. I think the BMSs balance because on the last video when you were testing the BMSs overcharge protection, it was supposed to draw 0 but the reason it drew like 10w is probably because it was balance charging the other cells. I think this can make assembly and battery health monitoring much easier. Anyways. I think these projects are great! Please keep it up the world needs more of this :)
Interesting 'stack.' The long Alodine stand-offs that are used as a 'buss' seems odd. Why? While Alodine is a 'protective' for aluminum, it's a chormate and remains HIGHLY resistant to electrical conduction. The threaded portions should be chemically 'de-plated,' if indeed that's a Alodine or Iridite coating.
hi, thanks for the video, I already calculated if I want to build a 5kw powerwall, it seems the diy way is much more expensive than buying factory complete powerwall.
Since the indicator show the level of a column and not the level of a board, If you have a dead cell in one of the boards, how do you know what board it is?
the ambient noise of you moving things around on the desk is VERY loud, a solder mat of some form of dampening would make the audio portion as good as the video portion
Well, here goes nothin'. I just finished population my first 25X. I need to assemble it with the BMS. I'm using an Outback Flexmax 60 MPPT charge controller and a 880 W solar PV array which has it's own SOC ability. I may need to go back and check the balance but for now I just want to get it working. I also have a Flexmax 80 and will eventually use it with another 4 panel PV array, for a total of 1800W. The cells I'm using are some pretested ones I just bought at the garage sale and a bunch from those medical 3.7V UPS packs. The next 350 cells will be from the scooter packs, for a total of 75X. Should be one heck of an off-grid powerwall system. These will replace FLA batteries. Outback has the program for Lithium chemistry but I still wan the extra protection of the BMS'.
This content is simply amazing, I am excited for future optimizations to your battery system. You have convinced me that I can do this myself. :') Thank you
Discharge them all first. You want the lowest amount of energy in these things if you're going to screw something up. If you have them all fully charged that would be major problems if you happen to accidentally touch something you shouldn't or flip something backwards. Talking about giant Balls of Fire
Just make sure you cycle them and figure out their capacity to pair them up better. Honestly i wouldn't worry about them being charged, just don't rush and make sure cells are the correct orientation and you should be fine. Plus you dont have to wait to charge the dang thing to see if its alive. To each their own, just take your time and you'll be fine.
Could you please provide the model number of the tool you used to read the infrared heat. Would it be a good idea to use a smaller wattage Grid tie inverter so as to draw power from the battery bank at a lower amp draw?
I watched a video on a guy who states that a BMS will ruin the battery pack earlier than it should and can leave you stranded in the middle of nowhere with no way of bypassing the BMS because of one stupid faulty chip. He also states that by charging these batteries to 4.2 volts is a huge no,no. 4 volts is optimum and will provide longevity. He uses RC chargers and can digitally monitor each cell for near perfect balance.
@@jehugarcia Nope. It makes perfect sense what he does. I will try and find the video to send it. Could be a game changer for you Jehu on a positive note. OK here it is.....czcams.com/video/pljSZcEwc8Q/video.html
jehugarcia say what? 2 yrs ago you made fun of cheap Chinese bms’s protecting your expensive batteries. On THAT GUYS VIDEO! Now you’re selling and advocating um... 3 x BMS made where?! I recall you’re videos also saying you don’t NEED a bms... you are wildly inconsistent and the design flaws in this ‘system’ of yours will likely lead to a lawsuit against you. Good luck.
ChiefJustice Middleton he was quite correct too, undercharging, and not fully discharging drastically increases life cycles... I’m as puzzled why jehu won’t acknowledge him as you mate
I hate the EU duty and TAX policy. Too expensive buy used battery cells from USA. $1 cell = ~ $2 cell. A new cell from internal EU seller = $7 - $10. But i love your content and your projects.
Aliexpress, 3000 mAh batteries for around 2.30€ a pop, and if you buy in bulk you can score under 2 dollars And they are good batteries, already shrinktubed and basically brand new. Bought them quite a few times, every single one tests within +-100mAh of the rated capacity. Actually they come close to each other, around 30mAh average deviation. Only things that kill me is shipping costs, but i now arrange group buy and pay DHL delivery and it comes out to around 20€ per person per 100 batteries, fully tracked and everything.
@@lazar2175 thx, your informative comment. Not bad price, but i chack the EU customs tariff table. 100 cell ~ 200€ Shipping ~ 20€ Total = 220€ Eu Duty = 0.12% = 26€ Pack with duty= 246€ TAX (hungary) = 27% TAX (germany) = 18% Pack with TAX (germany): 291€ = 2,91€/cell = 3,23$/cell Pack with TAX (hungary): 325€ = 3,25€/cell = 3,6$/cell So, if i switch back to my original comment: buy a new cell in EU is most expensive :) Minimum 3 and a half times than in US. The europian people need to count this price, not a "usa" price
@@drprofesszor Yes, indeed, in America they have cheaper cells because they have lower import taxes and other things. But i mean, it isn't really all that bad here, except my country will put a "luxury" tag on any import over 50€, and then i have to pay them 10% of it's value. I overcome this by asking a seller to put a sticker stating that a package is a "gift" so it does not undergo any taxes. Also, you could try salvaging laptop batteries if you wish. Just a friendly reminder, don't ever buy from liito kala on AliEx, they are a 100% fakes with less than 1000mAh but advertised as 3000mAh. The reason why batteries are expensive here in EU is because there are a lot of safety regulations that they have to pass, so smaller manufacturers can't bother and won't sell in EU, leaving LG,Samsung and others to jack up the price. If you want to order from Europe, check out batterybro.com or eu.nkon.nl, they have nice onesy right now some Sony 3000 mAh batteries for 3.99€.
Power walls are OK but I wanna know how to make a ev or improve my hybrid. What can I use to make a new battery pack? Do I use this or the battery pack method with the bus bars and individual fuses and bms in a plastic holder?
@jehugarcia I am a landscaper here in southern California. Certain cities are forcing my trade to switch to battery powered equipment. I all for it except, the lithium Ion battery packs are extremely expensive. Anyway you can make a video and help us out?
In the RC hobby we talk about balancing cells with NOT MORE THAN .1V/CELL DIFFERENT!!! But why?? Has anyone done a test to determine the amps drawn by an 18650 of regular resistance, when it's at say 3.8v and another cell is at 4 or 4.1v?? In my belief, we might be too cautious, maybe by a factor of two or three. At least with LiPo, which we use in RC, which these days will accept as much as 5C charging without any degredation. on a mere 2AH cell that equates to 10A, and I wonder if connecting a 3.8V cell to a 4V cell won't go past those kind of limits. :)
Not so much of an issue between two cells, as the low one would be pulled up while the high one is pulled down and they meet somewhere in the middle. Depending on internal resistance and chemistry, current could be up around 20A, but you'd usually see an amp or two with laptop cells. If you have 100 high cells vs 1 low cell then you could get a much higher differential and put lots of amps way over the C rating of the low cell. < 0.1V difference is a good guide and even better if the difference is as small as possible. This is of course magnified with bigger packs.
@@ahaveland Fair enough, but then what is the regular person who isn't connecting 100 cells to 1 to do? Say three cells at 4v to one at 3.8v. Really cell count doesnt matter much i guess, as the IR of these liPo can be very low. My small packs are 10mohms
@@friendlyfire01 3 cells at 4V to 1 of 3.8V = initial common voltage = 3.95 V, so low cell sees 0.15V delta increase. I=V/R therefore I = 0.15 / (0.010 + (0.010/3)) = 0.15V / 13.3mΩ = 11 amps. You can do what you like, but my advice is to keep voltages as close as possible before connecting. edit: Or maybe 0.2V / 13.3mΩ = 15A. Still significant!
@@ahaveland you're absolutely right, that's significant. For small cells like im using that'd be too much, a few dozen times and you'd find you had methane in the lipo causing it to puff up. Thanks @Andy Lee Robinson !
@@friendlyfire01 Thanks! ps... it's not methane that puffs up lipos, it's oxygen! It is somewhat reversible if you charge and discharge gently while under pressure. Better that it doesn't happen, but the cell is still usable for a while. Just make sure you don't underdischarge them, and I know that's difficult to do with RC models when we need that last 10 seconds to land....
There is not a lot of info on these pcb systems..... Any info on the rainbow bms connector system ? Also the 7 line battery indicator board..... Does this show voltage on each of the paralell connected bms lines and do the bms lines paralell connect the cell banks ? Or is the battery indicator combining the reading for one cell from each board ??
Putting your BMS in the center makes sense, but why then did you put your connector that is going to be used to wire additional packs in parallel on the other end? Wouldn't it make sense to have it right there connected to the BMS as well?
Hi , your battery pack design is great. My only question is about your balancing, as you check the balance between the serial connected batteries on each board if I understand your construction correct. But isn't it the balance between the parallel connected batteries that is the most important? So that the number one cell on every board should match, then all number two and so on... Best regards, Niclas (from Sweden)
The battery pack needs to be made out of ceramic. A 3D Plastic Printer should be used to mold the ceramic into battery holders with screw down terminals which screw down to the circuit board. This would eliminate the heat problem. Plastic is unsafe.
can any one explain me. how there can be 1 , two or 3 bms boards parralel on that board. ? i am intrested to use bms in a parralel situation. does each bms have it''s own series of cells ?
Claudiu Minciu I have those cells from evwest for sale on eBay. What would you be willing to pay and how many do you need? I can send them within Europe.
Quick question: On the battery module, what kind of metal is used to contact the pos 18650 anode and cathode? I am asking because I have read these types of modules typically use a relatively highly resistive metal that may be problematic to larger applications.
Nice video, but wouldn’t it been better to have added right angle connector to the board? So it would have been much easier connecting the ribbon cable to.
What about charging this pack? Let's say if I want to charge it overnight on the cheaper rate and use it during the day. Then what kind of charger you recommend?
You may be explaining this in a future video but I'm curious how someone would go about correctly sizing their battery setup and solar setup based on their bills from the utility?
Pull a year's worth of bills. Add all the kw usage and divide by 12. This gives you your monthly KW usage. KW means Kilo watt or 1000 watts. Add 20% and that is how you size your battery pack. For Solar. Each panel is different. But you need the same number of panels that match what your average usage is. Add 20% so that you can charge your battery pack as well as be supplied by the panels. You must select a panel that has enough ampreage to add up to your monthly usage. You put pannels in series and parallel to get the desired voltage and current output. There is a lot of planning that goes into this. It is recommended your installation be permitted by your local city. Allot of math goes into planning. It's a lot like doing your taxes. You should have a basic knowledge of electricity and how ohms law works if you plan on doing this yourself.
I bought a worth of $1,000 batteries cell from your website just last week. so please If you don't mind my suggestion to please explain or talk about how many voltages, Amp do we get out this battery set right here. It gives an idea to the beginner like me to make a decision about what kind of KIT I need from your website. I am trying to go off-grid. I want to set up 25Kw to 30Kw. I want to buy your kits, but I am still trying to catch up on a lot of stuff that is unexplained in your video to help me make my decision based on that just as an example. please if you can make another video with little more details that will be great. Specially the Power wall that you made about Build a DIY Powerwall Using NEW Panasonic NCR18650BD cells could have little more details on that. I love the setting. very clean set up.
Um, 2.6A X9 as filmed is 23.4... not 26A. Jehu you are missing aboard. Assembled I see the stack as 41.6A with those cells, a BMS and a monitoring board.
Great vids, bought some cells. Was wondering in all the builds you do...any issues with discharging cells while continually charging with solar charged?
Pro tip. The other end of that multi-color ribbon cable will have tiny bits of exposed wire on the end. Even when flush cut.
You want to avoid having the end touching anything.
This channel gets better by the day, This type of project went from hard to easy REAL FAST!
Your heat sinking videos how and what can you tell me what you're using is it on an iPhone and adapter where can I get it thank you very much I saw you all the time whatever you need whatever I can do let us know thank you for showing us all the way it's very very appreciated
manfishh@aol.com
Im impressed, was impressed before but this is what we were waiting to see. Start to finish build. Aeesome.
Thank you for all the information I have been watching your channel almost 3 years now. Every time I watch I begin to understand a little more about evs or better pack build ups. Its been 2years of me looking for the perfect bike to build I will eventually buy one and source most things from you or sites you reccomend. I'm glad I didn't jump in it right away because it seems tech is coming up faster than finding a Hayabusa in my area at the right price. I started collecting old laptop batteries but with all the information you give which I greatly appreciate is becoming much easier. Mostly I'll come out with a better build. I thank you brother and speak many blessings on you.
I think heat shrink over the standoffs between boards might be a good idea. That way if you drop a tool or something you will not get a dead short across the standoff terminals.
Ecospider5 agreed! Massive design oversight...
Clumsy people should wear helmets everyday, but to suggest everyone use them is extreme. Sounds like you are accident prone, take the needed precautions to stay safe.
@@jehugarcia that is too funny but even really careful people can sometimes slip up. :)
You can crimp the connector with a vice. Be gentle closing the vice and do not over tighten. When crimping a connector you feel a stiff resistance at first as the connector bites through the cable's plastic insulation. Then it becomes easy to finish the last 60% of the crimp. You do not need to give a final "tight" squeeze, it only damages the plastic.
Robert Harker Or even a piece of hardwood and hit it with a hammer if you are careful.
Anybody know the name of that crimping tool on amazon? I have had fairly bad luck with my vice, too slow. Or a link?
LOVE your channel love what your doing with recycling the battery's, so much that I just ordered 6 battery's for my vaping mod. thank you for the great way to save money, save the landfill, and support a small business. YOUR AWESOME
Really like this system you can replace any part of it if it goes bad nice job 👍
Love you're work mate. I am from south Australia and we pay an average of 35 to 42 C per KWH. Stuff like this is life saving.
I'm in port Lincoln mate what part off this Australia you in
Nicko Blicko look into HBpowerwall channel, and AveRage Joe for better, more consistent, reliable good info. Pete’s a great guy too (for a QLD’er hehe)
@@deanauzzieevans685 Elizabeth, Adelaide.
@@nickoblicko7046 moved from john rice avenue to Lincoln five years ago hard to get a good supply of 18650 here
@@deanauzzieevans685 oh wow I'm just around the corner! Add me to your google I have a mate who does imports when I have the $$ going to make one of this guys systems.
Small world!
This video, single handedly, will be responsible for the rising cost of reclaimed batteries
Just hmu I get used 18650 laptop modules for way cheaper than anything can offer.
It's like looking for old rusty coins on the beach when you can order pre-rolled never been circulated change from the comfort of your home. Reclaiming batteries should be like Folk Art it should understood but that's about all. No one wants old under/over cycled highly unpredictable cells everyone wants the new LG Panasonic Samsung cells. Why would you want recycle batteries when you can get 60+ Amp rated 21700/26650/3200P/32650 up to 10,000mah for $1-$13 each wholesale. Headway 10AH 100A cells are $15-$30 why are people dumpster diving for old batteries with a few dozen more cycles left in them... Maxwell 17v "SELF BALANCING" Super Capacitors modules which have over 1,000,000 cycles are $150 each from Mouser & Digikey and people loitering trash piles when it's trash for good reason seeing as It's trash compared to New(0 cycle) Lifepo4 batteries PCB balanced with Super Capacitors.
@@mindyabiznarc it sounds like a very small amount of money to you, but some people don't have that. I won't be dumpster diving, but I'm considering using batteryhookup.com for mine
@@mindyabiznarc A 10,00mah battery for $1😒 F**K off you troll.
What is the savings between used/new?
Unscrew the chrome fan guards and get more air! No mod. is needed. Leave two screws in, keeps the fan attached, no need to take back cover off.
The chrome fan guard will have virtually no resistance / airflow impact.
What I don't understand is why he hasn't incorporated heat management into the system (A fan to turn on to keep things cool If they get too warm… To maximize battery life)
I like your idea to use multiple BMS systems. As they love to break... However running them at 50amps if one has broken.
Anyway I'm planning to use multiple BMS on the e-bike battery's I will build
Welcome to the future. Good job, Jehu.
I am looking to get rid of 40 of these boards that I got from Jehu's Website. I don't know where else to market them because people don't know what they are or how to use them other than Jehu's audience. They are all already built, just need to add batteries. Let me know if you are interested. Thanks!
When are we going to see a complete video on how to build the pack and charge the pack form solar using the BMS?
Amen. I’m not an electrical engineer I’d like to build one and install it using plugged solar panels. But also would like to not burn my house down so I need step by step instructions from start to finish
@@mrramz424 same here Mr. Ramz. Great video but should go step by step on how to set up everything to run. So dummies like myself don't burn down anything... Come on man teach us...........
Your product is great and i've had a blast building my modules and testing them. They work great!!! I would also like to see more about your suggested wiring connections to inverter and solar setup's. Maybe also some suggestions on inverter charge setup (float and bulk charge), low and disconnect voltages etc. Thank you very much for the channel and hoping to see some of these video's
Thats batterie Art...just love it
Mr. Garcia! Could you make a video showing us how to charge these battery packs with solar panels? I am confused as to how to set up the parameters for the solar charger correctly. Thanks!
I second this, more importantly the voltage i have to input into the BMS module, will 24v do?
The BMS is doing balancing to each row of calls. To hook this up to a solar system all you need to do is follow a simple guide online and connect it to your charge controller. Connect battery to controller first then panels. Controller usually decides what battery voltage its at and should take it from there, if its a cheapo change its charge voltage cutoff and float for lithium standards and you guys should be golden.
Nice build Jehu. I like this video. Good that you check the temps everywhere.
Jehu, you should install a 13 kW solar electric panel array on your roof, build two or three DIY powerwalls with these pcb’s, so all your home and electric vehicle charging needs will be met, even during blackout and to avoid expensive peak power rates during high demand times of day?!
I use a vise to press ribbon connectors on.
Thanks for the great vids & ideas! One question I had was is that matching the cell voltage really that important? I believe those BMSs have balancing functions on their own and if it doesn't the user can balance it via one of those BattGO systems. I think the BMSs balance because on the last video when you were testing the BMSs overcharge protection, it was supposed to draw 0 but the reason it drew like 10w is probably because it was balance charging the other cells. I think this can make assembly and battery health monitoring much easier.
Anyways. I think these projects are great! Please keep it up the world needs more of this :)
Be better with battery internal resistance match
Great teacher :D
The most important part is to have the impedance of the cells within 20% margin of each other when matching them in parallel.
This is a great video! I love it!
DIY Powerwall. Great idea! Keep up the great work!
Interesting 'stack.' The long Alodine stand-offs that are used as a 'buss' seems odd. Why? While Alodine is a 'protective' for aluminum, it's a chormate and remains HIGHLY resistant to electrical conduction. The threaded portions should be chemically 'de-plated,' if indeed that's a Alodine or Iridite coating.
I'd like to see a 48 volt build that I could build for my cabin
Really good video!! Best regards from Perú!!
I undertand so so.. I Will use traslator for your videos :(
Great info as usual. Thanks for keeping us up to date
Nice and clean idea!
hi, thanks for the video, I already calculated if I want to build a 5kw powerwall, it seems the diy way is much more expensive than buying factory complete powerwall.
Straight forward and very informative. Thank you so much.
Nice work
Since the indicator show the level of a column and not the level of a board, If you have a dead cell in one of the boards, how do you know what board it is?
the ambient noise of you moving things around on the desk is VERY loud, a solder mat of some form of dampening would make the audio portion as good as the video portion
Very impressive 🙏🙏🙏👌👌👌
Are you going to make the led Indicator
Pcb available?
Well, here goes nothin'. I just finished population my first 25X. I need
to assemble it with the BMS. I'm using an Outback Flexmax 60 MPPT
charge controller and a 880 W solar PV array which has it's own SOC
ability. I may need to go back and check the balance but for now I just
want to get it working. I also have a Flexmax 80 and will eventually use
it with another 4 panel PV array, for a total of 1800W. The cells I'm
using are some pretested ones I just bought at the garage sale and a
bunch from those medical 3.7V UPS packs. The next 350 cells will be from
the scooter packs, for a total of 75X. Should be one heck of an
off-grid powerwall system. These will replace FLA batteries. Outback has
the program for Lithium chemistry but I still wan the extra protection
of the BMS'.
This content is simply amazing, I am excited for future optimizations to your battery system. You have convinced me that I can do this myself. :') Thank you
Helpful video, keep them coming!
sweet
It would be easier to charge them all first?
Discharge them all first. You want the lowest amount of energy in these things if you're going to screw something up. If you have them all fully charged that would be major problems if you happen to accidentally touch something you shouldn't or flip something backwards. Talking about giant Balls of Fire
Just make sure you cycle them and figure out their capacity to pair them up better. Honestly i wouldn't worry about them being charged, just don't rush and make sure cells are the correct orientation and you should be fine. Plus you dont have to wait to charge the dang thing to see if its alive. To each their own, just take your time and you'll be fine.
Could you please provide the model number of the tool you used to read the infrared heat. Would it be a good idea to use a smaller wattage Grid tie inverter so as to draw power from the battery bank at a lower amp draw?
I watched a video on a guy who states that a BMS will ruin the battery pack earlier than it should and can leave you stranded in the middle of nowhere with no way of bypassing the BMS because of one stupid faulty chip. He also states that by charging these batteries to 4.2 volts is a huge no,no. 4 volts is optimum and will provide longevity. He uses RC chargers and can digitally monitor each cell for near perfect balance.
Sounds like a crazy guy
@@jehugarcia Nope. It makes perfect sense what he does. I will try and find the video to send it. Could be a game changer for you Jehu on a positive note. OK here it is.....czcams.com/video/pljSZcEwc8Q/video.html
@@jehugarcia I think you have communicated with this fellow. So why are you not supporting what he does and teaching people this information??
jehugarcia say what? 2 yrs ago you made fun of cheap Chinese bms’s protecting your expensive batteries. On THAT GUYS VIDEO! Now you’re selling and advocating um... 3 x BMS made where?! I recall you’re videos also saying you don’t NEED a bms... you are wildly inconsistent and the design flaws in this ‘system’ of yours will likely lead to a lawsuit against you. Good luck.
ChiefJustice Middleton he was quite correct too, undercharging, and not fully discharging drastically increases life cycles... I’m as puzzled why jehu won’t acknowledge him as you mate
Where can I get the state of charge board or is it in your kit?
Great job
I hate the EU duty and TAX policy. Too expensive buy used battery cells from USA.
$1 cell = ~ $2 cell. A new cell from internal EU seller = $7 - $10.
But i love your content and your projects.
2900mAh NCR18650PF PANASONIC is 4.5eur in normal electronic shop here in EU no idea where you are looking in =]]
Have a look at nkon.nl I ordered 6 cells for my 💻 at their shop.
Aliexpress, 3000 mAh batteries for around 2.30€ a pop, and if you buy in bulk you can score under 2 dollars
And they are good batteries, already shrinktubed and basically brand new.
Bought them quite a few times, every single one tests within +-100mAh of the rated capacity.
Actually they come close to each other, around 30mAh average deviation.
Only things that kill me is shipping costs, but i now arrange group buy and pay DHL delivery and it comes out to around 20€ per person per 100 batteries, fully tracked and everything.
@@lazar2175 thx, your informative comment. Not bad price, but i chack the EU customs tariff table.
100 cell ~ 200€
Shipping ~ 20€
Total = 220€
Eu Duty = 0.12% = 26€
Pack with duty= 246€
TAX (hungary) = 27%
TAX (germany) = 18%
Pack with TAX (germany):
291€ = 2,91€/cell = 3,23$/cell
Pack with TAX (hungary):
325€ = 3,25€/cell = 3,6$/cell
So, if i switch back to my original comment: buy a new cell in EU is most expensive :)
Minimum 3 and a half times than in US. The europian people need to count this price, not a "usa" price
@@drprofesszor Yes, indeed, in America they have cheaper cells because they have lower import taxes and other things.
But i mean, it isn't really all that bad here, except my country will put a "luxury" tag on any import over 50€, and then i have to pay them 10% of it's value.
I overcome this by asking a seller to put a sticker stating that a package is a "gift" so it does not undergo any taxes.
Also, you could try salvaging laptop batteries if you wish.
Just a friendly reminder, don't ever buy from liito kala on AliEx, they are a 100% fakes with less than 1000mAh but advertised as 3000mAh.
The reason why batteries are expensive here in EU is because there are a lot of safety regulations that they have to pass, so smaller manufacturers can't bother and won't sell in EU, leaving LG,Samsung and others to jack up the price.
If you want to order from Europe, check out batterybro.com or eu.nkon.nl, they have nice onesy right now some Sony 3000 mAh batteries for 3.99€.
What is the meter thats tracking amps, volts , and watts when he hooked the inverter up?
Great video
how do the temperature readings compare between soldered batteries, spot welded batteries and this design?
why the battery holders are not in 2 sides?
Why does your thermal camera click and freeze every few seconds?
You can use a Vise to put the end on your Ribbons. I have made 100's that way building Lottery Machine.
True but I’ve also Broken many so I just bought the $10 tool
Power walls are OK but I wanna know how to make a ev or improve my hybrid.
What can I use to make a new battery pack? Do I use this or the battery pack method with the bus bars and individual fuses and bms in a plastic holder?
I love your channel, please is it possible to get this in 4s?
no star lock washer between stand offs ?
@jehugarcia I am a landscaper here in southern California. Certain cities are forcing my trade to switch to battery powered equipment. I all for it except, the lithium Ion battery packs are extremely expensive. Anyway you can make a video and help us out?
In the RC hobby we talk about balancing cells with NOT MORE THAN .1V/CELL DIFFERENT!!! But why?? Has anyone done a test to determine the amps drawn by an 18650 of regular resistance, when it's at say 3.8v and another cell is at 4 or 4.1v??
In my belief, we might be too cautious, maybe by a factor of two or three. At least with LiPo, which we use in RC, which these days will accept as much as 5C charging without any degredation. on a mere 2AH cell that equates to 10A, and I wonder if connecting a 3.8V cell to a 4V cell won't go past those kind of limits. :)
Not so much of an issue between two cells, as the low one would be pulled up while the high one is pulled down and they meet somewhere in the middle. Depending on internal resistance and chemistry, current could be up around 20A, but you'd usually see an amp or two with laptop cells.
If you have 100 high cells vs 1 low cell then you could get a much higher differential and put lots of amps way over the C rating of the low cell.
< 0.1V difference is a good guide and even better if the difference is as small as possible.
This is of course magnified with bigger packs.
@@ahaveland Fair enough, but then what is the regular person who isn't connecting 100 cells to 1 to do? Say three cells at 4v to one at 3.8v. Really cell count doesnt matter much i guess, as the IR of these
liPo can be very low. My small packs are 10mohms
@@friendlyfire01 3 cells at 4V to 1 of 3.8V = initial common voltage = 3.95 V, so low cell sees 0.15V delta increase.
I=V/R therefore I = 0.15 / (0.010 + (0.010/3))
= 0.15V / 13.3mΩ = 11 amps.
You can do what you like, but my advice is to keep voltages as close as possible before connecting.
edit: Or maybe 0.2V / 13.3mΩ = 15A. Still significant!
@@ahaveland you're absolutely right, that's significant. For small cells like im using that'd be too much, a few dozen times and you'd find you had methane in the lipo causing it to puff up. Thanks @Andy Lee Robinson !
@@friendlyfire01 Thanks! ps... it's not methane that puffs up lipos, it's oxygen! It is somewhat reversible if you charge and discharge gently while under pressure. Better that it doesn't happen, but the cell is still usable for a while. Just make sure you don't underdischarge them, and I know that's difficult to do with RC models when we need that last 10 seconds to land....
Where did you bought your voltage and current meter? Can you send the link? Thank you!
Where is the link to the state of charge meter
Can you give a little more info on the ribbon cable and the connectors? I've about gone blind trying to count the individual wires...
16pin idc ribbon amzn.to/3CSIp62
how long it was running until fully discharge and at how much watts was the load.
There is not a lot of info on these pcb systems..... Any info on the rainbow bms connector system ?
Also the 7 line battery indicator board..... Does this show voltage on each of the paralell connected bms lines and do the bms lines paralell connect the cell banks ? Or is the battery indicator combining the reading for one cell from each board ??
انت بطل يلا عليا الطلاق 💪💪
Putting your BMS in the center makes sense, but why then did you put your connector that is going to be used to wire additional packs in parallel on the other end? Wouldn't it make sense to have it right there connected to the BMS as well?
Jehugarcia how can you get me this kits am in Saudi Arabia
Verry nice... thx jehu
Hi , your battery pack design is great. My only question is about your balancing, as you check the balance between the serial connected batteries on each board if I understand your construction correct. But isn't it the balance between the parallel connected batteries that is the most important? So that the number one cell on every board should match, then all number two and so on...
Best regards, Niclas (from Sweden)
I s thinking the same thing. Seems like you would need balance across all, but that's probably a noob thought.
The battery pack needs to be made out of ceramic. A 3D Plastic Printer should be used to mold the ceramic into battery holders with screw down terminals which screw down to the circuit board. This would eliminate the heat problem. Plastic is unsafe.
What is used to charge/re-charge these batteries ??
when you remove black and red cable at the bottom???
Great video I like your videos let me ask you can I connect those Harbor Freight rechargeable drill batteries and make a powerwall out of that
You should be able to, as long as you make sure that all of the batteries are relatively similar capacity as far as mah and voltage are concerned.
How many PCBs (7s double sided) need to build 6 kw power wall
can any one explain me. how there can be 1 , two or 3 bms boards parralel on that board. ? i am intrested to use bms in a parralel situation.
does each bms have it''s own series of cells ?
I want to buy some cell packs from evwest but for europe they have no transport. Any ideea how can we purchase with delivery in Romania(Europe)
Not sure, they are working on all certification I think
Claudiu Minciu I have those cells from evwest for sale on eBay. What would you be willing to pay and how many do you need? I can send them within Europe.
Smashing those boards around at the beginning is a killer for headphone people
Have you thought about a directional mic
I’m using my phone on this videos because I’m too busy to setup my real camera
Jehu. Very good video. Can you go more than 7s. Say I wanted to make a 48v pack?
2 in series = 48v
jehugarcia so connect the load side of another pack into the charge side of this pack, I believe
@@JasonWho I don't know that is why I am asking.
Hi,
do you have a purchase url for the led kit? 24:52
Do you have a purchase URL for the Monitor ? 26:04
id just put a fan over that board in my design lol
Couldn’t you use 28650 instead of 18650? They often come with higher mAh per battery.
Quick question: On the battery module, what kind of metal is used to contact the pos 18650 anode and cathode? I am asking because I have read these types of modules typically use a relatively highly resistive metal that may be problematic to larger applications.
Great kit. How much current can you push down the ribbon cables? I take each core can only handel a couple hundred millamps?
Nice one
Nice video, but wouldn’t it been better to have added right angle connector to the board? So it would have been much easier connecting the ribbon cable to.
He explained that this would take more space and he needed those few millimeters that's why he installed the straight connectors.
This is awesome, thank you!
Has Tesla ever reached out to you and told you to stop using the word "Powerwall"?
Tesla loves me
What about charging this pack? Let's say if I want to charge it overnight on the cheaper rate and use it during the day. Then what kind of charger you recommend?
The subject of a future video
18:43 -> Exact oldschool iPhone Unlock sound
Is the battery state of charge available now?
make a vedio for what capacity of charger to be used with battery pack.
nice！
My main curiosity with this is the safety. How do I know that the batteries aren't going to explode or cause any issues due to over or under charging?
You may be explaining this in a future video but I'm curious how someone would go about correctly sizing their battery setup and solar setup based on their bills from the utility?
Pull a year's worth of bills. Add all the kw usage and divide by 12. This gives you your monthly KW usage. KW means Kilo watt or 1000 watts. Add 20% and that is how you size your battery pack. For Solar. Each panel is different. But you need the same number of panels that match what your average usage is. Add 20% so that you can charge your battery pack as well as be supplied by the panels. You must select a panel that has enough ampreage to add up to your monthly usage. You put pannels in series and parallel to get the desired voltage and current output. There is a lot of planning that goes into this. It is recommended your installation be permitted by your local city. Allot of math goes into planning. It's a lot like doing your taxes. You should have a basic knowledge of electricity and how ohms law works if you plan on doing this yourself.
I like the system, but if you ever have to do any work to the packs, you have to take it all apart..
I bought a worth of $1,000 batteries cell from your website just last week. so please If you don't mind my suggestion to please explain or talk about how many voltages, Amp do we get out this battery set right here. It gives an idea to the beginner like me to make a decision about what kind of KIT I need from your website. I am trying to go off-grid. I want to set up 25Kw to 30Kw. I want to buy your kits, but I am still trying to catch up on a lot of stuff that is unexplained in your video to help me make my decision based on that just as an example. please if you can make another video with little more details that will be great. Specially the Power wall that you made about Build a DIY Powerwall Using NEW Panasonic NCR18650BD cells could have little more details on that. I love the setting. very clean set up.
Could I pair the high performance pcb boards with the regular 1c pcb boards ??
Yes
Um, 2.6A X9 as filmed is 23.4... not 26A. Jehu you are missing aboard. Assembled I see the stack as 41.6A with those cells, a BMS and a monitoring board.
standoff not aligned OCD TRIGGERING !!!!!
Great vids, bought some cells. Was wondering in all the builds you do...any issues with discharging cells while continually charging with solar charged?
do you sell these boards for 26650 batteries also
Very soon I will, I’m finalizing my design now