7s 24V State of Charge battery Meter for DIY Powerwalls
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- เผยแพร่เมื่อ 19 พ.ย. 2024
- for more info on the PCB battery system visit kit.com/jehu/j...
To follow the development of the SoC meter visit / jehusdiypowerwalls
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A. Batteries work better at this time, caps are rare and expensive devices that are very good at doing things not needed for storage systems typically.
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For a first revision of a pcp for a end user product, I think it is very well done indeed. Respect to the maker for doing this for everybody here. TY for sharing the work.
A kit, that's what is needed, what you are doing is great, most products are as you say complex, but a kit you buy on ebay for example, would be great for people who are starting out.
Basic instructions and a link to your video showing what does what and there you go.
You the man jags.
I’ve made it with a multicolour LED BarGraph and use it in a single bar read, you than see immediately by The colour what The SOC is.
The Top LED is The Blue one and if that one is on it means The battery is overcharged.
The Dip switch is there to turn on and off each LED BarGraph Individualy but if not wanted you can use a small wire.
But i look into a way to integrate a pushbutton.
This is a very nice design! :)
What is SOC? please for us novices spell out what you mean.
@@batterypoweredgardener8181 State of charge
Mr. Sven >> I am curious to build me some smaller led meters for my packs, like 3S or 5S. can you share your schematic for the LM3914 set up ?
I hate those multicolor LED bar graphs, no offense. Give me solid green from top to bottom anyday. Unfortunately, they are usually a bit more expensive, but meh. Annoying since all they are are LED's in a light box, but better than trying to do it yourself.
Excellent Jehu. This system is going to be very practical and profitable once it all finished.
Love what you're doing Jehu! Thanks for sharing!
and add a socket for an optional ESP8266 WIFI transceiver module to allow for remote monitoring
Clyde Rasmussen Some work with a BMS with Bluetooth, So am i Working on Some PCB for that.
The Indicator Module still has Some free space but my idea is to keep it simple.
Open for suggestions but not all can be implemented if you want to keep it simple and affordable 😉
@@TheMarlboroMan1969 yes, understood that what I was asking for is a little excessive. Maybe keep in mind for future versions.
agreed, theres so many librarys and examples on that thing now, shame it didnt have more IO then it could have driven the leds too and ditched the 1970's lm3914's, then again do we need 70 leds on a board, the ws28xx leds are rgb and the esp can drive them all off just one pin with serial data, just a simple red yellow green status for each battery....
Monitoring over wifi with a smartphone and tablet sounds really great.
But probably less reliable and it's more important to be able to easily check it from time to time. Checking via wifi will be easier to forget I think than some board with a red LED blinking.
Great project, more affordable BMS systems are really needed. Thanks to whoever made this!
Better yet esp32
Dude nice good work we need people like you
I really really really want to buy about 100 of these. Battery prices are still to high atm. I'm hoping in another 2-3 years the price will be right for the batteries. By then I bet the boards you are making will be even nicer! Keep up the good work!
Kevin Roberts not true. Battery hookups just came out with there KILLER deal agin. 45 dollars(free shipping) for a 36v 4.4 (NEW) battery pack assembled with LG (new) cross so 20 batteries and a nice bms which is like ~1$ a cell, which is better than the normal $5-6 per cell for that high quality cell
@@Zodiac83104 I'd like to see it. Link? I'm on batteryhookup's site but it's not listed.
At this time LiFePO4 prismatic batteries seem the best option.
Idk why it wasn’t on their site yet loo
👍 "Another great video. I wish more of the others who make these style videos had your gift of video production and narrative skill."
Awesome Jehu. 👍👍 thanks for the updates
looking forward for complete system!
thank you, Jehu!!!
I can think of two minor improvements for the Meters. In the spare space in the bottom right of the PCB, you could put some Seven segment modules in to display main battery voltage as you mentioned.
Also, it'd be nice for an "empty" cell to have a single flashing bar on the display just to identify that the cell is discharged *and* the display hasn't failed. I know the BMS will stop you overcharging but it might be perceived that the cells are completely discharged when in fact something went wrong and caused the meters to fail. Additionally, if the Cell is in a state where it is "dead" i.e. not healthy, the whole meter could flash to say "There's a problem here", although I don't know how that would work with a stack of cells in parallel.
maybe bring the cell voltages down to that area to a header, add some mounting holes to allow for a daughter board, then the board design is "done" but configurable. People could experiment with different ways of rendering system voltages, either on-board with a different LED display type, or remotely via WiFi/BT, or whatever, by designing an appropriate add-on board that would plug-in to that header.
The later thing is pretty hard to do, since the Chips are completely analogue. Its not impossible, but it involves some extra chips per channel for it to work.
@@faheus which Chips are you referring to? I think if all the necessary board voltages were brought to the daughterboard header idea, someone could take that and run with it, spending whatever $ it took to get it working to the desired level of functionality.
@@BHerbertAZ the LM391x chips. It would be possible to do it on a atmel or something, but you either would need to supply directly from the Balanceplug or galvanicly isolate each cell to not lose resolution in the ADC. Doing it the LM391x way is pretty easy, since they can tolerate quite big voltages.
It would be possible to use some of those Liion monitoring ICs from Analog Devices, they can stack up up to 40s and talk over SPI with the micro.
If someone writes code, I could hit KiCad for couple of nights and make a prototype.
@@faheus I'm waiting on access to the Meter FB group, till then I'm kinda blind on the design there. Because my thinking had nothing to do with the existing chips on the board, but toward a separate circuit that would plug-in and allow one to connect to the cell voltages and do whatever with that.
You really should consider designing custom BMS, it really isn't hard at all, you just go check PDF datasheet of some 1 cell protection IC, copy-paste example application schematic, then multiply all to whatever cell count you need.
This would also allow you to get higher current easy, just more shunt resistors and mosfets if needed.
Other things you would be enabled to do keeping the cost low:
- balancing
- balancing indication(you just put a LED with the discharge resistor)
- overcurrent setting by adjusting a potentiometer
Do it, I’ll get behind it
@@jehugarcia Sorry mate but I already have a lot of work to do with my very delayed e-sk8 project, already offered help with PCB for other open project and few other things.
Also it would be probably better if you would find someone from US so it's easier to work on it together.
great! what about a BMS failure indicator? or an undercharge/overcharge indicator.
I too wish these China made BMS's had some sort of indicators on them, like low voltage turn off, or show if a cell is failing, or a charging led and a full charged indication.
Awesome i love it..big fan and about to switch to lithium and your giving lits if good ideas..ill def be one of your customers thanks for the Great Videos
Can't wait until it's done great work
😍Loving it😍
👍Great job 👍
I'm definitely interested
Let's us know when finally done.
Awesome ideas there. Instructions and then put the alternate resistor values for the other batteries.
You should set the display driver at dot instead of bar output. It would show only the highest led also displays with multiple colors are better to see if there is a problem. If you want a voltage output they make one that scans multiple cells and displays voltage at each battery. You would also be able to set a alarm voltage because it has a built in piezo speaker buzzer.
Daves Tech The PCB is designed to work as a one bar read and with a multicolour LED BarGraph.
If you want all read out you need to solder The JP’s, wich Jehu Did in this case.
Its The first design So there’s always something to make it better as Jehu Did instead of using The trimmers he put resistors of a certain value instead.
So next version Will have Some extra’s but for now this is a good start 😉
Maybe it could be a good idea to add some medium size probe points to the empty space of the bargraph PCB? For easy troubleshooting and more accurate readings with a multimeter. It doesn't necessarily add any cost and would be a good feature to have if everything but the front PCB is hard to reach.
Cool board update, and some good suggestions too!
Het Jehu, David here, the guy that sent you the Energus Tiny BMS. For the monitoring board one safety enhancement would be to add a buzzer if any cell goes higher than 4.2V. Your video gave me an idea... How about designing a board for the Energus Tiny BMS that integrates with your system. I could pre program them, so they would come on a board ready to plug in and go. They can be programmed to balance at any voltage, and trip at any voltage and amperage, have an on off switch etc. Maybe the guy who designed that LED monitoring board could do one for the Tiny BMS?
That is an awesome idea, pre determined settings so it works for our system design, People are designing boards to adapt other bms units to our boards already so this will happen
Tell me more About it.
Also thinking of ways to improve The board but people come Up with So many suggestions that implementing it all is impossible and would become too expensive...
The idea of The board was to have a visual on The SOC.
@@TheMarlboroMan1969 Hey Sven, I think what your board needs is an audible safety reminder of any over or under voltage cell.
I am an authorized distributor for Energus.
The Energus BMS has two versions, a 30 amp and a 60 amp continuous (requires heat sink) that also will drive an external relay for up to 750A draw. The higher power one is probably the one to use, as it is not much more expensive. It does 4-16 cells of any chemistry, current measurement and SOC calculation, Bluetooth, Configurable balancing voltage, ignition input, PC link for monitoring and set up. It is a high quality unit, and priced higher than the Chinese ones at $184.00 USD. Here is a link to it on my website: hilleater.ca/bms/
And the user manual: www.energusps.com/web/binary/saveas?filename_field=datas_fname&field=datas&model=ir.attachment&id=21072
I have asked Energus if they are interested in making an interface board for Jehu's system, I hope to hear back in a day or two.
David Elderton most of The products i use are from Victron...
And there a lot of security build in there already wich i can use to protect a lot but indeed now with the indicator PCB i only have a visual what the SOC is and if there’s a overscharge.
I can integrate that in there but The BMS i’ve ordered has Bluetooth and The features to protect against overcharge or undervoltage are also in there.
The idea to make The indicator Module was to have a simple visual on The SOC.
And what good is an alarm if you’re not at home to act ? That’s what The BMS should be doing...
hey man love your work
i can make PCB hardware and software can share you my work (as you are making it opensource) we will use a microcontroller
i am suggesting a 3 digit 7 segment display and it will cycle through all the battery voltage one by one
it will be great to work with you
we can add a mosfet on the output if you want to disable the output
Is there going to be a 13s board?
Yes, please!
Schematics for the solar gen? And are you ever going to or planning on doing the next video for that? I’ve just been trying to make one similar but have found some kinks and yours works fine and trying to see if your specific design can help lead me to find my solution :)
Thank you for your contribution. Looks great!
Hi, nice video and i love ur powerwall things i try do build one in germany too as backup for my 3d printer ;D
I have a chance to buy about 1500 one 18650 cell power banks enclosed in aluminum housing. Can I use them to build power wall? Is $400 a good deal? Should I have BMS for such configuration?
Yes always have a bad for anything in series. Depends on the manufacturer of the batteries, u might want to stress test a handful before you buy all of them to be safe, if possible
Those are cool. Thinking all these meters are going to drain the cells.
Need to get in touch with the Home Assistant community. @DrZzz has played with your stuff a bit already and may be interested in focusing his squirrels on this project
Can you make a beginners guide with your setup explained or link to helpful channels that do please?
That is realy neat.
Pretty cool. Needs a simple volt meter and ideally the high/low would trigger red/yellow LED’s instead of all green.
Jim Jenkins you can use a multicolour Led BarGraph and use it as a one bar read...
If your charging to 4v to 4.1 like you said in the video you will find the BMS boards will not balance the cells. The BMS boards only start balancing at 4.2volts, which will be a big problem if you never charge it fully. The cells will always be out of balance and it will keep getting worse until you do that 4.2volt charge. So ether always charge fully 4.2 or use the smart bms boards that you can program to start balancing at the lower voltage. On the bigger parks your building you will only want to use the smart bms boards with bluetooth so you can really monitor them.
Hellooo jehu.
I hav already developed a bms with screen and a wireless screen with all the protections
Hey Jehu... been watching DIY, and building a Powerwall for a couple years now, and I have created something that might be of use in a setup like this. Using an Arduino, and an Arduino Relay board, connected to a number of High Voltage Relays, I measure the sun's 'Intensity', pass that value to the Arduino, and then OPEN or CLOSE specific relays on the PV supply side. My system is a 48V Mixed Use, PEA Connected with PV Alternate supply and Battery Backup... it all seems to work quite well, and would be happy to share my experiences and code to the effort. I think the Meter you've shown has sufficient space for inclusion of the Arduino config., or some alternate config.
Have you thought about using a "Smart Bluetooth BMS 7S" for this case maybe. You can monitor your cells over an app and you dont need to use 3 bms systems in paralell and they are quite cheap.
I would still need multiple units on large powerwalls, how would one manage all them Bluetooth signals?
So I've had a concern with your PCB system for quite some time now: How do you address serviceability? If I have a battery go out in the middle of a stack of 8 PCB's, is it a 2 hour process just to get to that one battery and replace it?
Use quality cells and you shouldn’t have to worry
If you use a voltage divider circuit you can use an Arduino to monitor the voltage of the whole board over the analog input. You can use a resistor of say one and 5 mega-ohm and get an output at 4V. Now if your batteries are all loaded to 4.2V, the voltage would reach 4.9V. All voltages that an Arduino can read on that analog output..
Do it, and share the details so we can all re create it
I'm not sure how you would implement that in a wall pack, as i see it its one monitor per module. How about connecting it to all packs in a wall pack, with a turn know selector to show you each individual pack? Mu suggestion to add to the monitor. Can't wait to start my own, glad i found this channel ;)
It's not one monitor board per battery board. It's one monitor board per 7S pack. That ribbon cable connects the corresponding cell in every single module together so the voltages are the same for every board.
Hi Jehu! Do you think to replace 2 PCBs with BMS and battery monitoring to one that contains both functionalities? For example, constructed on ML5235 chip?
Perhaps some kind of arduino integration then it is possible to program your powerwall!
Where do you get them and do you send the international like Australia?
Mr. greens boat tanks and aluminium welding his website
I’ve seen some small charge controllers, you should make a charge control module for the towers.
What resistor I need to charge to get the brightness up, my led bar is hardly visible. Thank you.
Is this available in a 4s version please?
Good Day Jehu, Are you going to update the parts lists on your kit website to reflect the new double stack ability for the PCB and the higher level holders?
It’s all there, nothing new
@@jehugarcia ok so we can use the newest version? And just double the standoffs?
Rather than using a display lcd what about using a single led that can change color ? Like red , blue and green , it can reduce cost and space so you could integrate it with your other board ,
For LiFePO4 it would be better to have an 8s version (to still give ~24V).
Is there any way to show if all of the BMS's are working? If you know 2 of the BMS's have failed you pull that board and replace it with one where they all work and then replace the 2 failed BMS's on that board.
I can’t think of one without modifying the bms units themselves, which defeats the “off the shelf” approach
Nice Job 👍
jehu cool but im not much for DIY pls let me know where to order them already built plug and play!!!
Why are you even messing around building a powerwall or battery bank if you aren't much for DIY? you are just asking for bad things to happen.
Matt, most people aren’t much diy, that’s why plug and play products exist, Home batteries will become mainstream very soon but only a very tiny fraction of the market will be interested in building their own
thanks but i still need your device ready made so i just plug in batterys and connect to my inverter here in dominican republic theres probably close to 1,000,000 inverters in homes and business @@jehugarcia
Great information!! Really dope video 👌
jehugarcia that look real nice
Maybe an acoustic alarm (beeper) in case of malfunction could be included, since you can not keep your eyes on the system 24/7.
@jehu Liking this display... as you mention, a simple timer-based enable for bar graph segments, or simply enable segments while your push-button is depressed is a great thought. Stretching that conceptually, some may want full time indications, so again, a switch to select your display preference. Also adding overall system voltage via a 3 segment indicator another plus!
I'll echo another comment about LiFePO4 battery packs and the 8th cell enigma, but I don't see this coming to fruition? Perhaps a quick adaptation of this onto the 4-cell version for 12V packs?
Still trying to arrange a private consult with you? I have sent multiple email requests...
Sorry I don’t have time currently
@@jehugarcia Half hour max, or can you answer direct email questions? LiFePO4 kits and integration Q's
I would recommend some nice test points on the pcb. So you can meassure every cell with a multimeter.
They’re there
You can simply measure The voltage on The pointes where The fuses are...
And The way i test it all is to put an extra header on my flat cable and connect my isdt battgo bg-8s
13s "48v" and id be interested in using them on my solar electric bike system, especially if they were plug and play, with little to no soldering.
PARADOXICLES yeah but he’s not gonna do that 😂 he leaves it open bc it’s cheaper for everyone that way and because then it can fit peoples configurations if it’s for a 12v battery, 24, etc. maybe someone will make them for ppl who want plug and play later on
What do you think the cost per kwh will be?
Dylan T he said in the past, it depends on where u got ur batteries and how much.
How do I connect with you
Quick suggestion, you should make the top LED represent 4.2 that way you know when it's "over charged" and not being managed properly by the bms.
The bms balances above 4.2v
I use a multicolour LED BarGraph and The top LED IS the Blue one wich is the indication for me of being overcharged.
Maybe their Will be a Buizer buil in to act as an alarm but there’s So much people want that The PCB Will become to crowded and too expensive...
The ones under The Blue one go from green to orange into red and that’s The range in wich my voltage is set from 3.0V to 4.2V
@@jehugarcia so it will never balance when you charge it up to 4,1V max all the time? i had the same problem when thought of designing a long lifecyle battery pack. And i still don't have the answer....
Don't BMS balance cells at 4.2v? They resist any voltage that tries to go above 4.2v. ( unfortunately) have you found BMS that balance at a lower voltage?
Correct
@@jehugarcia um so you have found BMS that balance at a lower voltage? (Or are you saying that they do Balance at 4.2v)
@@creativecityis there are several Bluetooth BMS that allow you to set your own values for various parameters, including when balancing starts.
@@niktak1114 that's what I need, do you have a link to one?
@@jamest.5001 look on Aliexpress
NICE
Hey Jehu -- I'd like to make a version of this with a ESP8266 to act as a web server for monitoring the voltage
Do it
The DIP switch is a very cheap idea to turn things off when not needed. Keep it. Very important when dealing with batteries which are NEVER off. It's easy enough to put sacrificial jumper traces on the bottom. If the switch is not used you're fine. If you want the switch install it and slice the jumpers with appropriate tool.
randycarter2001 that was The whole idea About it 😉
Mine are always on So i can see from close and far what The SOC is.
And if its to much light, it is now while its in The living room still doing Some testing...
I can turn them off.
But gonna look into a solution to get something with a pushbutton and having it lit Up for a few seconds.
But for now its a start and a first idea from The mind to paper to what it is for now 😉
instead of a button to turn on for a few seconds, it would be better to build another pcb with multi button for each module to allow to connect each module for a few seconds to see the state.
Not needed
Are the PCB sold on Amazon?
Nope, they add 30% to cost, I rather keep them affordable
None of the links are working :(
Trim pots are better.... The chips aren't perfect the dropping resistors might be off.. And you can keep the system very accurate by fine tuning with pots... People shouldn't be building these lipo systems if they cant turn pots and measure lipos
So how do you know which side of the board you put the components on?
It’s pretty versatile and you can populate either or both sides, but the bms board requires you to mount components on side opposite the trace fuses marked Top on latest batches
Mr G...you really gotta get a fixed mount for the camera. I'm going dizzy ...
i have 4 18650s use it to power my backup camera should i use a bms??
Yes
does radio shack carry bms?@@jehugarcia
Do you live in the 80s?
@@jehugarcia I found radio shack still has a online store.... If that hasn't been shut down already.
80s was a great time.cars were cars u could work on them(no computer chip)beer was beer
I'd actually prefer the trim-pot version. Maybe make two versions of the board.
Up to you, it’s a diy project, you use what you prefer
@@jehugarcia I know - it's awesome :-)
Sorry, I don' get it. It shows every single batterie, that is great. But what if you have a stack of batteries? Like ten PCB's occupied with 14 cells each? Do you need 14 of those SoC Meters?
so there needs to be active balancing going on really at all times
9S, 32.85VDC, 2890MAH, 94.93WH porfavor me puedes dar una opinión de estas baterías
wow I made it on time …….. cool
Hey bro are you willing to share the circuit diagram? I want to build my own diy voltage metering. Or does anyone have a good schematic diagram I could use. Thank you
Join my fb group “Jehu’s DIY Powerwalls” the developer shared all the info rhere
jehugarcia I don’t have Facebook, my wife is Mexican bro. Lol. You know how that goes. But I’ll see how I can get it
It would be nice if there was an RJ45 Ethernet network interface so the battery levels could be remotely monitored.
I want to buy some these pcb thing you are doing how can I contact you?
You can do so at www.jag35.com
hell yeah
YaY I like it
Turn your batter around from 4v+ to the 3v so that the energy distribution is some what even..
The bigger volts should be closer to the circuit wire on the left
Going green🔋
isn't it 15 Amps per BMS board, so 45 Amps total, or 50 Amps each of the three parts?
Hola amigo están muy buenos los videos y todos los proyectos que has echo todos están muy padres pero no sé si puedas ponerle traducción en subtítulos en español es que el traductor automático de TH-cam no funciona muy bien con el inglés técnico
I would add a Arduino with a webserver to look up data online.
Dude...how do you do all this cool stuff, and yet have no space bar?!?
Because a missing space bar doesn't limit him from getting things done. A space is a tiny hurdle, just get over it.
I also have a virus that shuts off my browser at least once a day, I can spend a few hours re-uploading my os or i can just wait and get a new machine and fix all the issues
@@jehugarcia You know how you are with the battery stuff, I'm the same way with pc stuff. I'm just up here in Silver Springs NV. If you ever get up this way, give me a ring, happy to fix a brothers technology stuff.
Is not better to use a raspberry pi 3 ?
I'd say no. With the Pi, you're running an entire Linux OS as well as your programs. It's much easier to just have a purpose programmed microcontroller, there's less to go wrong. Once compiled and uploaded to the Arduino, the code is the _only_ thing the Arduino does.
Not for non coders like myself
Is OK.....
afraid to us my bms might catch fire bought three from ebay 4s system
No indication for over/under voltage?
1978jra i’ve build it with a multicolour LED BarGraph and set it in a way that The top bar, Blue LED, means overvoltage... and then it Goes down from green to orange and then red.
There is also a choice of using it as a one bar read out or all simply by soldering The JP’s together, all read out or leaving it as it is, one bar read out...
@@TheMarlboroMan1969 Sounds good!
Hola !
48V please!! solar systems
Use 1% resistors.
Good idea
Hey guys, I thought Id ask the community about where I can buy a bulk of 18650 batteries without going bankrupt. Any suggestions on are welcome.
diy system on chip meter?))
29.4 v
REMEMBER THE GOOD OLD DAYS...."""""""i DON'T BELIEVE IN BMS'S"""""""". NEVER SAY NEVER.
sven yeah bc I bet a pack almost burnt his house down one day
Beg my pardon, but that SOC is useless eye candy. I like the concept of the entire system though
I love eye candy
Hey