Hi, been watching your channel from the UK for ages and to start with had no idea about batteries/solar but after a while of watching I now have a basic grasp of the theory.. Many thanks and hope you continue to post vlogs to us newbies😊

@DavidPozEnergy

4 жыл бұрын

Glad to help. I'm new to these small cells (18650). This was my first build with them.

Being able to make your own power supply for different voltage/current levels today is more important than ever!!When you have your own electrical power at any level whenever and whereever that can be applied as quickly, safely is "SUCH a powerful tool to have!!!!!!!!!!!!!!!!!!!!!!!!!!

Great video, great build. Thank you for sharing and disclosing the sources.

Man this is awesome !! Discovered these 18650 by accident recently and for some strange reason i am following online and buying tons of gadgets, chargers, cables, multimeter, etc, etc, building a battery pack myself, i first got cells from my old Thinkpad, testing them was fun and i fell into the rabbit hole so to speak, i am autistic and this sort of thing is right up my street, always enjoyed having collections of batteries and chargers but never had a need for 18650 until now, its so addictive !! great video thanks.

I am building my own off grid solar system and have been watching youtude videos now for about a year, which sort of makes me an expert viewer, you and two other individuals produce some of the best video, steady camera, good explanation, and no "Ahs" every second word, thanks for your hard work trying to help us new users to solar....it is much appreciated

@saadomar1101

2 жыл бұрын

I am wondering if packs like these can be cycled everyday to some percentage (not full) or if they are for backup purposes only,

@simplyengineering2350

2 жыл бұрын

@@saadomar1101 If they're charged to 4v per cell and discharged to 3.1v per cell then the maximum cycles will nearly double. Charging them to 4.2v and discharging them lower than 3v is the standard. The last 0.2v is about 200mah, or lower depending on the cell's max capacity. So not much trade off to gain a lot more cycles.

Thank for sharing and the parts list\costs David. You're getting a lot better at builds...;-) Well Done.

@DavidPozEnergy

4 жыл бұрын

Thanks for watching.

I love that spot welder!

thanks for the great video! i really like the 48v, size, cost, spot weld tech and value of this build.

@DavidPozEnergy

4 жыл бұрын

Thanks for watching.

I've been thinking about doing this with my ammo cans!! Thank you!!!

Your spot welder is the most satisfying sound I've ever heard. It should be the default sound on all computers for "your input was successful".

I have been using those modem packs for about 6 years now and have never been disappointed.

Nice package David! Great value option too.

Thanks David, please do another video of this kind,respect from Kenya! Edit,am addicted to 1860 battery build but nowhere to be found in this part of the world

Something I wish I was good at! I love building car systems and E bikes so I can see having a use for these!

Very nice neat job. I love that welder you're using.

Pretty clean build. I guess I would hard mount that breaker to the lid of side of the box but that is just me.

That's exactly what I use except with a IEC/UPS kettle connection,I can't guarantee that mine are water proof but it's an innie connection so water will have trouble getting in

In my experience the red ones are always the ones that give me problems so I agree with your strategy of not using them if possible.

@ZebbMassiv

4 жыл бұрын

There's cheaper options for brand new all one brand cells instead of salvaging just gotta know where to look

I've also some bad luck with the red Sanyo sells, they are really hot when i use them and i had some old ones in the past that had leaked, no other brand that i've personally seen had done that

Great build. I have 2 packs almost identical to yours. I use them to power my tandem trike. I used Samsung CGR18650DA cells and can pull 40A without any problems. I wish my packs looked as good as yours. Thanks for a good video.

This is by no means my favorite build I've seen you do but it gave me the gumption to try an 18650 build. Battery hookup posted some used salvage valence batteries which as you probably know are full of 1300mah lifemgpo4 18650 cells. I got 3 batteries in the pack but there's bad cells in the bunch, so I'm hoping to get 200 good ones out of the 300 cells. Not the most energy dense chemistry ever but tolerant, reliable and long life. We'll see if that holds up after they got used and abused in their past life. Thanks for the inspiration.

Great video thanks for your time ser !!!!

i made one of those a few years ago, same ammo can. I used lipos in mine though and glued a 300w inverter to the side :D. Loved the build!

@DavidPozEnergy

4 жыл бұрын

I seem to remember you taking apart Ryobi packs for the Lipo cells. Is that a related build?

@GoingOffGrid101

4 жыл бұрын

@@DavidPozEnergy I used RC lipos in mine.

cool little monitors!! thanks for the education

That coil whine of the spot welder sounds so cool

Thanks for the video, been looking into building a DIY eBike and building my own battery pack for that so I have been watching just about everything I can using 18650 cells haha.

i love finding those LG's in laptop batteries. they are so dependable.

David wearing safety glasses. Norm Abram approves.

Great job, very knowledgeable

Probably the nicest Electric Bike DIY battery pack I've ever seen, very nice work! Making one immediately for my bike, probably use a plastic ammo can and put it in a backpack with a pigtail quick connect for security and stealth

@DavidPozEnergy

4 жыл бұрын

That will be great for an ebike.

love the spot welding

Great video. A couple of things I noticed. You mentioned that you set up the jst connectors to hook up your little gizmo to see how your batteries are doing....in reality it will only show you how each 'group' of 12 batteries, set up in parallel, are doing. It will not tell you if an individual cell is having issues. This will initially be masked by having the others cover for it, forcing them to work harder and weakening them as well. Which can lead to issues down the road. Unless you check them individually, you can only check up on the group as a whole. The 2nd thing you mentioned is that you don't have to make all your batteries at the same time, that you can add to them as you go along. This might not be a good idea unless you can match their capacity. For the same reason as above, if the first battery you put together was in good shape, a few months later, after alot of use, it might have lost some of its capacity. If you then put a new battery together and add it to it, it will potentially be at a different (higher) capacity. This will lead to it working harder to cover for the older battery which will lead to it's losing capacity earlier. The stress could also cause the individual batteries to get out of balance and because you can't check them individually... You ideally want to match battery amperage and capacity before pairing them.

That spot welder is amazing

@Musicpins

4 жыл бұрын

It is totally freaking awesome, its the best tool I have ever owned. Its available from Keith as David says, but if you are based in europe just go to www.keenlab.de/index.php/product/kweld-complete-kit/

such a nice build

Yep I want to see you build it for your chop saw cause I want to do the same thing thanks for the vid

Very nice video,good job

Nice job David!!

Very good video. And interesting of course useful.

Wow You are a good teacher

Very professional.

For padding, I would suggest either a 5mm craft foam or the anti-fatigue mat available from Home Depot. It will not likely break down, unlike bubble wrap, and can be better cut to shape.

@DavidPozEnergy

4 жыл бұрын

Thanks. I'll check it out.

Great video

Careful - 18650(s) are addictive... I started with 96 of them and 2 years later they grew to 1,000(s) :) You may have done this but you didn't mention it, so just in case, let me suggest that one should match the ah(s) in each parallel row so they all have aproximately the same ah. For example, 12 * 2300ah cells in 1 parallel row is 27,600ah so you you want all the other parallel rows to have aprox 27,600ah total (+ / - 5'ish%). The better they are matched, the easier they will stay in balance as the battery is charged/discharged.

@DavidPozEnergy

4 жыл бұрын

LOL. I can see how addicting they are. Very satisfying.

@RodneySolarCircuits

4 жыл бұрын

yes same story here. now I have over 4200 cells 14s300p

@Musicpins

4 жыл бұрын

I can see how important this is Kenneth, I guess it matters more the more cells you have in P? Anyway, I'm considering making my next build with those 26650 LiFePo4 for my workshop powerwall (3kwh) The problem is I can't find a charger/discharger for those that can do the Milli-ah calculation. I don't think my Xtar Dragon 4 thingy can do that chemistry, even though its a GREAT charger.

The technical jargon is WAY beyond my brain capacity, but still a very cool build vid!

I used an ammo can to make a self contained tester for checking trailer lights and trailer brakes. It only had to be 12 volt to operate the lights or brakes. I use it to test to trouble shoot if there is a problem or after doing a repair on any of these circuits. To charge it, I added a 12 volt power socket on the outside that I can connect to the 12 volt socket on my vehicle while I am driving. The socket on the ammo can can also be used to operate anything that can be plugged into the 12 accessory socket. It has the digital display that shows the voltage and also shows the current amp usage of whatever it is operating. The amp readout is great for testing the trailer brakes. By looking at the amp readout, you can tell if one of the brake electromagnets is bad or not.

@DavidPozEnergy

4 жыл бұрын

That sounds like a perfect application. Thanks for sharing.

skucome they used to say in the old days good job dude

Great jobs thanks for the info!

Very very nice. Thanks.

Nice I was waiting for you to start with 18650 cells. And yes I want to see a high amp 18650 cell pack or 21700 cells. Keep up the good work David. Greetings from Spain :)

that would make a savage battery for my 48v 750w ebike and id love to do a build like that,but id be nervous as hell that id mess it up

that leftover nickle scrap would be great for electroplating

Great job bud !

Betting this is super doable and easier with prismatic cells as well! Nice video Dave!

@DavidPozEnergy

4 жыл бұрын

I'd love to build it with some prismatic cells.

@N8TheSnake

4 жыл бұрын

@@DavidPozEnergy Pretty sure the prismatic cells would cost way more though. You got out pretty cheap on this one!

David there is a plastic sheet called Coroplast that is like plastic cardboard. It is commonly used to make signs and you can get it for free from some gas stations when they throw their signs away. I prefer to purchase 4X8 sheets and cut it up to make my dividers and covers. I use Kaptom tape where appropriate but only use packing tape on the Coroplast because the Coroplast in not high temp so why use high temp tape. Your plastic bottle is also not high temp but the Coroplast is much easier to use. Coroplast comes in different thicknesses the 4mil is the easiest to find and is what most gas station signs are made of. I much prefer the 2mil type but you will need to go to sign store to buy it!

Very Nice

What a nice build! I'm still trying to convince my wife to let me build one but she says I've already made to many battery fires haha

Hi David, once again awesome video! A few things, you need to sort the cells into banks capacity wise , the reason being when drawing current from the pack if one P has a lower capacity it will drain faster than the others, thereby causing the pack to discharge faster than it otherwise would have. There is an online cell logger I think on battery hookups site? Not completely sure on that one so don't quote me there, Average Joe uses it when building his batteries to closely balance his P's capacity wise. The other thing I would have done before heat-shrinking the battery would have been to charge it up and do a full few cycles drawing enough current so that you could monitor the cells with a thermometer or if you have one an IR thermometer so that you could see if there were any problematic cells before sealing everything up. It would suck big time to have to tear it all down just because of three or four cells not wanting to play nicely together. There are a few downsides to using recycled cells, BUT, it sure beats the crap out of a LA battery, AND! You DIYed IT! Once again, Awesome build.

@DavidPozEnergy

4 жыл бұрын

I agree. The website is repackr. You put in all the cell capacities and it organizes them for you. I wanted to do this, but couldn't. The tester I used was way out of whack. I couldn't trust any of the numbers it was giving me. If I had used some Opus testers, then I could have trusted the numbers and I would have used repackr. that was my original intent. The only good thing about the tester I used was that it charged and discharged the cells heavily so I was able to see if there were any "heaters". (none). I plan to do a follow up video with some testing. I'll let you in on it. I discharged the whole thing in under 2 hours, (high amps) and we did not exceed the cells data sheet for maximum temperature.

Please do a video with those high discharge Ryobi cells! I have a bunch and wondering how capable they are

Decent, except for the low amperage. Much of the fun of using that size battery is being able to draw hundreds of amps out of them when needed. I use only 6 of the 18650s in a portable "juicer" for my smartphone and it works well. I just used a "hodge podge" of batteries, some new, some used, I didn't care. It can charge my smartphone 3 times from 0 to 100% before it needs to be charged too.

If you are a good engineer I wish I was born in America and would have come to you and taken a lot of knowledge.

That's a great little project! People will be able to follow along. Hey, on your miter saw, have you considered powering it with DC? It's probably got a "universal" motor that will run on either DC or AC. You'd need a 120 V pack, but you wouldn't need an inverter. Keep the projects coming!

@DavidPozEnergy

4 жыл бұрын

Do you know of any blogs or videos where someone has done it. I don't want to experiment with such an expensive tool.

@lenturnbow6417

4 жыл бұрын

You’d need a beefy external power switch. D.C. arcing can destroy an AC power switch in short order. (See what I did there?)

That spot welder is the business, isn't it?! As always, great work David.

@DavidPozEnergy

4 жыл бұрын

It's pretty good. Let me know if you think I should make a video on it.

@petermorris9592

4 жыл бұрын

@@DavidPozEnergy No, I think you should give it to me to make a video on 😉 Seriously though, leave that to the manufacturer. I was building one of my own, but that one looks so good I think I'll buy one. Who did you say made it?

@DavidPozEnergy

4 жыл бұрын

LOL. I don't know who makes it. But Keith sells it through his company 18650ed. 18650shrinkandcellholders.com/kweld/

@howiegrapek

4 жыл бұрын

@@DavidPozEnergy Yes, make a video on how to best built it from the parts. intersting gizmo indeed.

Superb!

Good project. What I would really like to see is a project building a 12V battery. I have a desire to replace the 12V house batteries in my RV and if I could build a reliable 12V battery to replace the deepcycle lead acids then that would be great. IF I could build a 12v 1.3kva battery for $200 as opposed to nearly $1000 for a battleborn then that would be a project I might dive into. Ideally it would be a drop in replacement for lead acid and be in that save basic form factor and ideally with top post terminals so all the current wiring works. A 24v or 48v just requires too much modification to the existing systems of the RV for me to really consider going that route.

Brilliantly designed pack! I've would add third wire to buss bars. Do not leave these voltage monitors / ballancers unattended in the pack. From what I remembered they drow their supply only from one cell in the pack. If the pack is left for long time without charging, this cell will be drained. Keep the good work

@DavidPozEnergy

4 жыл бұрын

Thank you. Yes, that's correct about the cell checkers.

I got a hundred of those packs last month. Still working on the damn things.

@DavidPozEnergy

4 жыл бұрын

Me too. I bought more during that big sale and am working on them.

Dave, loved the video. I live in Woonsocket and not far from 18650 Heat Shrink & Cell in Lincoln. Sounds like you are not too far away either. Would love to grab a coffee sometime. I have a slide in truck camper that I want to put 200-300 watt panels on and a couple of Lifepo4 batteries so I can boondock for a week or two off grid without starting the generator.

@DavidPozEnergy

4 жыл бұрын

Sounds like a great project. Can you contact me through Facebook? facebook.com/DavidPozEnergy/

Great video. How would you make a car battery replacement?

This would be a nice way too power up your RV camper. Small, and can be daisy chained in series for more amp hours. Imagine 6bof these in a camper, with solar panels on the roof, and a nice inverter. I imagine one could get several days off a bank of 6 of these.

awesome!

@DavidPozEnergy

4 жыл бұрын

Thanks Jehu. I really appreciate that coming from you.

@jayclark8271

3 жыл бұрын

Sure! It’s easy to teach something if the audience already knows all your ackronyms! That’s like teaching into the mirror. Only needs one person, no empathy and no thinking. Bye.

@jfh400

3 жыл бұрын

@@jayclark8271 this comment is a POS

Lækkert super grundig❤️❤️❤️🏁🇩🇰

Hey Dave if you see this. You have to go to harbor freight and get a pair of icon flush cut s. There expensive at $40 but lifetime warranty. I use them to cut the nickel off the cells. I did over 500 cells with my set. And they still cut like new.

@DavidPozEnergy

3 жыл бұрын

Thanks for the tip

very cool

Nice build! Best practice would be to crimp and solder the connection from your bussbar to the BMS.

@DavidPozEnergy

4 жыл бұрын

I don't know which is best, crimp only, or crimp and solder. But I do know that no matter which way I do it, there will be people telling me to do it the other way. LOL. When I made my video on LTO I crimped and soldered and received quite a bit of negative feedback for that.

@BenBuildsDIY

4 жыл бұрын

DavidPoz Haha, I made a video with crimp and solder and received similar feedback. One of my electrical engineering profs justified the crimp and solder method stating that the solder wetting the copper prevents copper oxide from forming at the junction. Copper oxide is significantly less conducive than copper metal. Additionally the solder helps prevent the connection from wiggling loose as the crushed copper deforms over time from the pressure causing the connection to loosen up. Just my 0.02- I’ve never had trouble with crimp and solder and have seen crimp only fail many times before (mostly due to bad crimp jobs though).

@DavidPozEnergy

4 жыл бұрын

Thanks for your 0.02. I like your explanation, make a lot of sense.

Thanks for sharing David. I was wondering if you would mind giving me the best lay out and component values that I would need in order to build a 220 to 240 volt 5 kilowatt off grid solar system? Themis.

20:24 That's a massive tip! "That's what she said"

Super sir

I press along the seam of the modem pack with a flat screw driver an to unstick the cell inside I used a flat plastic

Dude you have a lot of patience! great job.

For the first time I get how fuse strip works out... If a battery shorts, the fuse melts and disconnects battery.... Why did I have such a hard time sorting that out...

love the music...

What BMS would you recommend for my 100P 14S Powerwall?

Having measured the capacity of each cell, it would be sensible to allocate cells to each parallel group so that the groups all add up to the same capacity. There is a spreadsheet tool on the internet somewhere that does this for you.

@DavidPozEnergy

4 жыл бұрын

yes, the online tool is called repacker. I couldn't do that because the cell tester was very inaccurate, and inconsistent. I would have done that if I had some Opus testers.

Thanks for the video! I’m working on something similar for camping or wherever I might need the power. You mention you used a 20amp breaker to limit current and heat. How is the 20amp circuit breaker limiting current for you, or it that just for safety? Wouldn’t that 60 amp BMS allow more than 20amps especially with that wire thickness at 48v? I’m really looking for the best way to hold typical outbound current in an ammo can like this, and the only thing I can come up with that would also fit in a can this size is specific cable size that is matched to the max amps I want to let out, so that only a certain amount of current can be pulled from the batteries. So I was just curious if the breaker is helping at all to limit current without popping all of the time with 168 cells divided by only 20 amps, or if you had any other suggestions?

@dougeiserloh4938

3 жыл бұрын

The BMS has over current protection so why not just go with the 20 amp BMS and skip the $15 circuit breaker. The 20 amp BMS cost $10 less than the 60 amp BMS and will disconnect the battery if you go over 20 amps. That BMS has a 15, 20, 30, 40, 50, 60, 80 and 100 amp version. I would think for your application and battery type the 15 or 20 amp version would be better.

Good one

Very cool

If There was ever a major failure and the fuses had to blow. I'm not sure that plastic bottle would insulate against short circuits. I just watched the video that average Joe done with his thermal cam. Showing the fuses blowing. I would love to see that test. Love your vids mate

@DavidPozEnergy

4 жыл бұрын

Do you have any suggestions of something thin, non-conductive, with a higher temperature rating? I think 2-liter bottles are PET plastic, which is like 500°F. I think that's higher than the plastic in heat shrink, but I'm no engineer. There is also 2 layers of tape in the sandwich. I saw Average Joes video. It was great.

what is advantage of all this work to spot weld 168 cells together vs buying the big flat battery packs which are high amps/capacity and only having to solder in a dozen spots?

Could you put several of these to make a power wall? I have 22 solar panels on my roof and in the future I might consider making my own power wall set up.

@DavidPozEnergy

4 жыл бұрын

Yes you could. Just make sure not to exceed the amp ratings. The reality is you don't want to charge a cell more than 500ma. Which means try not to charge this 12p arrangement more than 6 amps. But you just do out the math for your situation.

harbor frt sell plastic auto body tools which I use when I am dismantling lip packs. I believe it is a safer way to get salvaged batteries.

What container were you using to store your 18650 cells? It would be great to have something to store a bunch of them like that.

Have you considered the Headway 38120 LiFePo4 batteries from batteryhookup for your Mitersaw? Maybe only in 24v for less weight. They are huge and their discharge rate is very high.

@DavidPozEnergy

4 жыл бұрын

Sure. Nothing wrong with those, the specs are great.

Thanks for sharing. Would it be too much trouble for you to give me the best lay out system and values of the components I would need to build a 240 volt 5 kilowatt off grid solar system. Thanks

Wow Bud, you lost me watching your disassembly of the battery packs. I was figuring out how long it takes just to dress the batteries up and testing them. You work like a robotic machine. It would take me about a year per battery. I figured I would never have a battery bank built large enough for my needs before I died. Sure enjoyed watching your build.

@DavidPozEnergy

4 жыл бұрын

The first pack took me an hour (4 cells) but I very quickly found the groove. At the very end I even had it down to 32 minutes. I posted 40 as a good average.

I had watched your video and enjoyed it. I thank you for that. I wish if you can do a video on building a car battery (12V). I thank you in advance.

@jonneilsmyth9107

4 жыл бұрын

just keep 4 of the cells in series giving you around 14 .4 v and have as many parallel stacks as you can fit in the can box to lift the AMPS or wherever you are putting them

Busy boy are ye lol looks nice and professional

@DavidPozEnergy

4 жыл бұрын

Thanks.

What happens if a battery goes bad and shorts? No individual battery fuses? Looks like maybe those little rings that are spot welded have a smaller tab connecting to the rest that could burn off perhaps?

@oakheart572

3 жыл бұрын

The nickel Strips He uses from battery hook up has individual fuses for each cell

Great build. Looks as good as factory made. Only concern I might have is with the ammo can is if there is any interior heat build up. How would you know before a cell goes thermal runaway? The can being fully enclosed would also not allow much ventilation of the packs. Maybe do a strong load test and show monitored temps at various cells IN the closed can and the outside metal of the can. Maybe the can is an adequate heat sink to air, but does not help if a cell becomes a heater. Great job!

@DavidPozEnergy

4 жыл бұрын

It's always about compromise. You can have wide open cells in the room, but no fire protection. This takes the approach of enclosing the cells to protect the room. The downside is you have to limit the amps to limit the heat buildup. That's why I used a 20 amp circuit breaker. The cells could do twice that. I have been doing a series of tests on it at different amps and measuring the heat buildup. It will be in a future video.

Hi Dave, just watched this video of yours and liked it a lot. I was a little concerned when I saw you wrap that tape and then the shrink wrap around the whole bundle. I know it looked nice and neat but I was concerned about ventilation and air cooling. At the end you mentioned removing the gasket, and I assume that was what that was for, but with all the tape and wrap, there is no way you can get any air cooling. Just my thoughts. Thanks for the videos. M.

@dbeysoyt

2 жыл бұрын

Heat dissipation is a concern for heavy loads or fast charges. Author mentions limiting the max amps for that reason. 20A max / 12P ~ 1.6A per 14S group, should not generate too much heat from 2.2Ah rated cells. For protection a BMS with thermal shutoff function could be used with sensors distributed within the block.

I tried the link for the spot welder you gave but I didn't get a connection. Any chance you could give another link for that welder. Thank you