Save Time and Hassle, Build a DIY Battery Capacity Meter, V2

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Thanks for your suggestions on my last video. Now I'm implementing your ideas to make an upgraded, version 2 meter. This meter should be a little more accurate for testing my battery capacities. By building this meter into a self-contained system, I will save time when setting up a battery test.
I build my own batteries, or sometimes just re-build them. This is all part of my larger plan for being energy independent. Eventually I'll power my house year-round off the grid.
First Video (Version 1) of the meter build: • Better Battery Modding...
18650 Lithium cells are from batteryhookup....
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Disclaimer:
My videos are in no way intended to be instructional "how-to" lessons. I am simply documenting my project for informational purposes. Property damage, personal injury, or death may result, even when following manufacturer's instructions. I cannot be held liable for such damage or injury. It is YOUR OBLIGATION to ensure that you are complying with any local and federal laws as well as code and permit requirements.

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Опубликовано:

4 окт 2024

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Комментарии : 177

@BloodBlight 3 года назад

I really like putting the fuse between the cells! I will be adding that to future projects.

@prosperousJ 3 года назад

Great Video! Version 2 is a winner! I enjoy that you put all the hiccups in your videos, shows us you're human too. I Got 32 of the 32650's with your discount code for a small solar generator build and now I'm gonna have to build one of these to test it! Keep up the awesome content!

@sbene6439 3 года назад

Finally someone is doing a real load test, with heaters! Tired of load test videos that show a led lighting up or a saw spinning up not cutting.

@LithiumSolar 3 года назад

Great upgrades! I do think the original was sufficient for our purposes (not lab equipment) but it never hurts to improve.

@dieselpowered 3 года назад

Adding sense wires is a great addition

@fisherus 3 года назад

Dave, you don't awe me with your videos anymore. That's basically because I am still mesmerized by your "Tower of power " video!

@gn02020202 3 года назад

The LED in your setup will be backwards because in automotive settings the switched part is expected to go inline with the positive wire, then the other side of the light goes to ground. This is because most automotive settings have the negative wire going to the frame instead of back to the battery.

@jamest.5001 3 года назад

You could have drilled the nut for the gland, out a bit, for the lug to fit through, (possibly). Great work

@BrightSparkIdeas 3 года назад

Great videos, good to see someone working things out as you go along. We all make those simple mistakes with the wire, so it is good you left them in to remind us.

@mcasoftwaresolutions756 3 года назад

Thanks David for all your responses to my emails

@larsltj 3 года назад

I also made one of these a few months ago using the exact same meter. Mine is only with 50A shunt and the box quite a bit smaller. I'm using a rechargeable 9v battery for external power to the meter. This will also light up the rocker switch to turn the meter on (edit: I saw the polarity comment) 😀. I also added a charger port to the 9v battery on the box so it's easy to charge it without opening the box every time 😀 The 9v battery is a lithium type with built in USB charger port. So I just added an extension cable and a wall port to the outside. And I used Anderson to the cables on both sides...

@patrickdavey9692 3 года назад

Your little swirch may have a led which needs the correct polarity

@patrickaschoff9240 3 года назад

For sure David you are switching the negative, technically not necessary to switch the negative in this type of circuit. The rocker switch light LED is a diode which requires correct polarity. So do us all the happy dance and rewire, switching the positive and ground the gold tab.

@MrSpencerpaul88 3 года назад

I commented on this without seeing your responce... I'm like 80% sure that's the case. But I really need to know haha

@rtmsound1877 2 года назад

Very cool. I might have to build one. The other meter I need is one for solar panels. Maybe with a shorting button to measure Isc.

@techsir8866 3 года назад

Love watching your videos, always educational and entertaining.

@benlyons7752 3 года назад

I always enjoy your content. It is duly noted that you review comments and take suggestions. One day soon we will have some solar too. Looking at potentially using bifacial panels for my shed.

@DavidPozEnergy 3 года назад

Thanks for leaving a comment. Yes, I try to get to all of them.

@muddywatersurbanfarm2608 2 года назад

Nice! I just ordered this meter. Well one model of it. I was doing some research on it and I think you can hook up 12v for the backup power for the meter. It has a range from 3v to 12v for that connection. Then you led on the switch will work.

@talenttrading 3 года назад

David does! Hands on, way to go!

@jamest5149 3 года назад

Put a charging port for your modem back up batteries in the side

@stevebabiak6997 3 года назад

And put a real fuse holder on the outside so that it can be replaced without disassembling the box. Either a fuse is needed and thus will be expected to need to be replaced, or it isn’t needed at all.

@eDoc2020 3 года назад

@@stevebabiak6997 Uh, the fuse is a safety device that's there just in case. It's not expected to blow but is still "needed" because something might fail unexpectedly and cause excessive current. Personally I'd also put a fuse on the + sense wire from the battery because this wire would also carry excessive current if the meter shorts out.

@MrOldandslow 3 года назад

Excellent construction techniques! Good job!

@drescherjm 3 года назад

I like all of the improvements. I was yelling at my PC while watching the video when you did not run the volt sense wires to the battery the last time.

@DavidPozEnergy 3 года назад

Did the computer yell back? LOL

@drescherjm 3 года назад

@@DavidPozEnergy No, but my wife wanted to know what was wrong.

@jamest5149 3 года назад

You could have cut a slot in the ID of the gland so it fits over the terminal. Oh well, all sorted.

@jamessawyer4625 3 года назад

I like the new feeder wires being a good length to reach the battery. You can calibrate the test set with a chart showing the difference fusing the I phone or the mutli meeter as reference. That will work....

@gkeith4120 3 года назад

Thanks, lots of consideration I Made smaller size 300 amp shunt with 12v recharging internal battery and anderson connectors form harbor freight jumper cable (clamps). Put Matching anderson’s 175 connector on leftover 17 foot #2awg cables if I need to use straight jumper or use 17 foot from meter source.

@luckydogfarms 2 года назад

Always learn more when I watch your videos! Thanks, J

@davidmcclare443 3 года назад

hi i have a theory that the power to the led in the switch is backwards can you test it?

@jamess1787 3 года назад

I wonder! 8v should have been enough to get a faint glow at least.....

@CrimsonRepair 3 года назад

It definitely is. Those switches are designed so when it's "on" the LED side of the switch should be in the flipped position. He's got it upside down and the wiring reversed.

@jjrony7 3 года назад

you are right it is backward

@Dennis-mq6or 3 года назад

I believe the brass connection is where the ground wire attaches to light the led when the switch is closed. If the led stays lit all the time, reverse the leads to the two remaining connections of the switch...

@carbonrrpilot 3 года назад

@@CrimsonRepair ive bought several batches of those switches, some close the circuit when led side is down and others are closed when the led side us up but they all look the same..... theyre from china, so nothing is for sure or consistent!

@loucinci3922 3 года назад

Hello from South Florida. I think you could use a dremel or file on that plastic nut so the connector would have made it through the hole. Function over fashion. Looks good. Good improvements.

@yankey4 3 года назад

Love it. V1 was fine but over kill is cool too. Thanks for sharing and God Bless.

@claudemontezin911 Год назад

Looks like you're over qualified to work for the space industry. Thanks for the very professional (you're a lot neater than I am) instructions. You know, once we know where we have some voltage drops here and there and approximately by how much, it's routine to just think with that. The important is to make things work and to our own expectations. NASA and the Russians were drinking their own (recycled) pee, eating meals was not a pleasant thing, and they knew their life span expectancy will be shortened by irradiation due to poor shielding. That's their expectations. So you're doing just great David. Great job! DIY rocks!

@Dennis-mq6or 3 года назад

Huge improvement Dave. It may only perform the same functions as it did before, but you made it much safer for the everyday guy to use, especially the circuit breaker / switch for those who do not have a circuit breaker switch built into the battery.. It would be nice to see a 2S bms on those meter batteries along with a resistor and diode to recharge the batteries while using the meter. The diode to provide charging isolation and the resistor to limit the charging current to 0.1 amp or less... The 4-wire connection is by far the best way to go because the voltmeter will accurately read the battery voltage over a very wide range of wire lengths and gauge variations between the voltmeter and the battery....

@ayubshaikh9156 Год назад

Baby´s advice / recommendations very important ,……! Very Cute….. Hydraulic. Terminal punch ,……. Celestial gift for a hands -on electrician….!

@jmac430 3 года назад

I'm not positive, but I think you may have installed that switch using the opposite polarity... (see what I did there? 😆 lol). It's an led so it does matter and I own the same ones, they work down to about 6v, to my surprise... Not a huge deal, just figured I'd pass that info along since it is a pretty nice feature having that on/off led feedback... Cheers! - Jesse

@DavidPozEnergy 3 года назад

Thanks for letting me know. And, yes, I got that. LOL

@jwrhynejr9608 3 года назад

Another awesome build upgrade! Thank you for your tenacity!!!

@eksine 3 года назад

I think putting it in a box might be a problem because the shunt gets hot, if it is a problem I'd stick a fan in the box, actually tbh having the box seems unnecessary but this video is very helpful with the rest of the setup

@stevec5000 3 года назад

David you should get a label maker for your projects. I picked up a nice Brother P-Touch model at Goodwill for $4.00 that already had a roll of tape in it and just needed batteries!

@krakenking1597 3 года назад

Super awesome! I like v2.

@u123446 3 года назад

Dave, you did a mistake on the switch with the light that's why the light did not go on. here how to connect it, It's an easy fix: Connect the positive wire from the small batteries to the gold pin (you have that wrong), Connect the meter vcc to the middle pin. Connect the ground of the batteries to the last pin. that should turn on the light when the switch in the on position.

@kurtrakeman9319 3 года назад

Well done mate. Useful gadget for battery guys like us.

@ETraylor3 3 года назад

How will those batteries that run your meter charge? Just swap the polarity on the LED and it will work.

@dash8brj 3 года назад

Chuck in a 2S bms for LiIon and a DC barrel jack. Feed it 9V and let the BMS HV cutoff handle full charge disconnect.

@patrickaschoff9240 3 года назад

David, the scope - connect back the harbor fright inverter and load the inverter with your 1.0 pf loads (resistive). Overloads are the cool things to see, try adding led lights or power supply type loads, these should cause the pf to challenge and sometimes really break up these less expensive inverters. And you may see the Puresine inverters break down at the peaks, not necessary bad but yeah interesting, for bad data monitor the Current now that's cool. You can't zoom in on the sinewave with amplitude just in time. Zoom out and in on time, zooming out you can see the sinewave shift when you add or disconnect the load. If you can record and take a snapshot of that event you could zoom in the see what the load step did to the sinewave. The crappy sinewave cause heating and performance on devices connected, that's is why you would want the a reliable inverter with 5% thd spec's. Getting this scope to take a snapshot should be easy but maybe not so much in real time for you videos. Most new scopes with IR or Bluetooth software it's not user friendly until you pay $$$$ for it.

@henvan8737 Год назад

The crimp lugs for the circuit breaker have too large a bolt hole. Smaller lug hole sizes are recommended as increases your contact area.

@tommycurren8064 3 года назад

U wired the switch wrong the darker terminal is for the ground and the other 2 terminals are for the positive i have a bunch of those switchs and they will light up with 5 to 16.5 volts other than that u did great i love watching your videos

@ooglek 3 года назад

Nice improvements! V3: keep your 2 x 18650 batteries charged when voltage is present. I don't think the power drawn will affect your experimental output, but if you're concerned about a 30mV loss, then maybe not.

@trif55 2 года назад

yea someone else mentioned using a little 2x 18650 BMS to keep them charged and balanced, the other thing would be to add a "charging" switch so you could disable/enable charging when you need to

@korishan 3 года назад

Generally those thin nuts are referred to as Jam Nuts. They are used quite often in automotive on the tie rods, or any rods that can be adjusted in length for calibration. Other applications are where you need a narrow nut for low profile. And for locking another nut in place as well, using 2 nut against each other. As I type this, it get's more and more naughty sounding the more I type 🤣

@DavidPozEnergy 3 года назад

Thank you for your comment. I didn't know the official term for the thin nuts. Jam Nuts. Thanks.

@mdesm2005 3 года назад

your sense wire doesn't carry any current, so it could be smaller than 16 gauge

@alanlester397 3 года назад

you should have put double pole double throw switch. You could power the meter from the source or the 18650. You may be caught out with no 18650 power at some point.

@melroyel2235 10 месяцев назад

Awesome upgrade! Dude you should do voiceover you have the voice for it.

@gkeith4120 3 года назад

Good job BUT I certainly would’ve appreciated if you would’ve given us a link or at least a description of what the plastic locknuts for the wires were. Could’ve save me a half hour of looking for the damn things. PVC Threaded Strain Relief Connectors

@teadott 3 года назад

You should have drill a microscopic hole at the top under the bottom right corner left adjacent side. Give the man a break LOL.

@raybacchus1026 3 года назад

Good job David I like part 2

@a2cryss 3 года назад

Could you have used 3 cells to allow it to stay above 8v as they discharge? Would also allow the led to get proper voltage once the polarity is correct.

@pigeon3036 3 года назад

Awesome! Keep up the great work!😉😉

@rickharms1 2 года назад

This unit measures volts and amps, but not Ah (amp hours) To me, Ah is "capacity". Now, I will concede that I could very well be full of "you know what", especially because you have much, much more experience than I. I made this comment only to be corrected, if necessary, by those with more experience. Thank you for your videos.

@josepeixoto3384 2 года назад

For solar setup that meter is almost worthless,because it ADDS up the Ah going in and the Ah going out ofthe battery; AND ,at the end of the day,or night... you still don't know how many AH went in or out, just a messy salad of both. Been trying to make it register ONE WAY only,maybe with a diode(??) but i don't think it can be easily done, now.

@MrElf31 3 года назад

The switch light does not have a negative wire so no light is correct. It may still work with 8 volts. LED's use very little voltage. But its not needed in reality. I would love a parts list to build that in my own carlon box.

@slidewaze 3 года назад

That roll of #4 wire looks expensive. (Enjoying your vids!)

@Maxttor 3 года назад

and lithium cells it´s gonna work? thanks for sharing knowledge

@juliosolis8755 2 года назад

Great work!!! This version seems to be awesome.

@geoffreykail9129 3 года назад

I think you have the LED voltage reversed. But then I'm hundreds of miles away. LOL.

@CollinBaillie 2 года назад

Did you ever fix the reversed wires on the switch? Typically you switch positive. So the LED is effectively wired backwards, and will not light.

@cpirius 3 года назад

Nice, great updates :)

@jwrhynejr9608 3 года назад

ABSOLUTELY GREAT INFORMATION

@tomstdenis 3 года назад

RGB lighting, make it RC controlled (having to walk over to things is so 20th century), add speakers and make it play techno where the BPM is controlled by the amperage?

@ricardobernardo2603 3 года назад

Thanks for sharing ..

@keithcress1335 Год назад

Hi David. I just built a tester and realized it's reading way WAY off. The current is off by about 1/2. I remembered this vid and came back to see how you built your tester. Much to my horror I see you used the exact same unit with what looks like the exact same supplied shunt. 🤪 You checked the voltage displayed in this vid but did you ever check the current? My voltage is spot-on, it's the current that's way off. I wonder if they gave me the wrong shunt. Mine states 100A 75mV do you recall what yours had printed on the side? I did measure the voltage across the shunt and it was exactly correct for the current running thru it based on the 100A-75mV. Had to laugh at your cable grip screw-up. I've probably done that 20 times. It's always painful time wise but more painful emotionally. 😀

@DavidPozEnergy Год назад

The shunt was off slightly. I think (maybe) they calibrate it at 100 Amps on the 100A shunt. But, anywhere lower then that and it's off. I re-calibrated mine lower because I tend to pull 25-30A during my testing. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fCRJ8XdPrn4.html

@keithcress1335 Год назад

Cool you were able to adjust the shunt! Mine though, when set up with a 100A shunt and set to read a 100A shunt reads 38.2A when I'm drawing 63.1A. Conversely it reads 11.4A when drawing 23.8A. That means it's reading only 60.5% AND 47.9% respectively of the actual current at two different current levels!! This means you can't even use a multiplier for correction like you could.

@therichofficial1465 2 года назад

I like this video. BTW, can this PZEM-015 mesaure a parameter charge of battery?. Such as time charging and amperage charging.

@roycesmith308 3 года назад

INTERESTING? YES. BUT? WHY? WHAT CAN I USE THIS INFO FOR? POWER MY HOUSE OFF GRID? AGAIN, HOW? ARE THERE ANY BOOKS ON THIS: BATTERY BUILDING: DIY, ETC? HOW LONG WILL THESE DIY BATTERIES LAST? LONGEVITY? HOW MANY CYCLES? IF I HAVE A LOT OF 18650 BATTERIES AND BUILD A BIG BATTERY SIMILAR TO THIS ONE? HOW LONG WOULD IT LAST? SUCH AS SMALL CURRENT DRAINS AND UP? SO MANY QUESTIONS, CAN'T REALLY FIND A LOT OF ANSWERS

@Dutch_off_grid_homesteading 3 года назад

heya 1 more nice meter for your collection keep the vlog's coming love it

@brianposton8547 2 года назад

What is the part name and number for the shunt and meter you used? I have a 200 amp battery and want to build this type if box. Love all the information you pass on to average guys.

@VTX1029 3 года назад

You have the polarity wrong on that switch. Negative to the brass post, positive to the silver posts

@benkanobe7500 Год назад

I did not see the plastic strain reliefs link used in this build as compared to the original with metal

@OrbOPic Год назад

Hi Dave, could you redo this all again as this didnt show the internal resistance of the battery if you didnt notice another major thing that shows health of battery.

@mikejf4377 3 года назад

I like this one. Great video.

@offgridwanabe 3 года назад

It should live long and prosper lol as long as you don't reverse the leads.

@MrSpencerpaul88 3 года назад

I'm super curious about the 12v switch you fitted, is it upside down? As it could explain no light at all, and I'm thinking the little light should be on the "on" side not the off side. Please please please test and let me know it's driving me crazy not knowing haha

@f.k.6151 2 года назад

Hi. Thanks for the video. What is the name of the meter you have mounted on?

@rolliebca 3 года назад

Hi David, loved this video, BUT there's a Kickstarter campaign ending in 2 days you need to be aware of. It's a redesign of the ElectroDacus SBMS redesigned for mass production. It can be found here: @t He's close to his target but could definitely do with a push! Thanks, and I look forward to your next video.

@DazzaDirect 3 года назад

@DavidPoz #DavidPoz and/or anyone who knows is this meter used in both videos bi-directional measuring amps and if so does it have a minus sign that appears and does the accumulated Ah change, thanks for the great content ;-)

@mrtechie6810 3 года назад

No, it is not a coulomb meter. It adds regardless of charge or discharge.

@benkanobe7500 Год назад

If you get a chance, could you add the links for the materials used in this Version Two, please?

@DavidPozEnergy Год назад

Sorry, I don't have links for everything because sometimes I just use what is kickin' around.

@hoosiersolarpower974 3 года назад

hi David really enjoy your how to videos can you or have you used a honda/toyota hybrid batteries NIMH 48 volt system if so which BMS would had used

@peterlindstrom8865 3 года назад

Do you have a link for the plastic Cable Glands? The link you provided is for the metallic ones. Thank you for the video. Great inspiration to me regarding the meter box!

@DavidPozEnergy 3 года назад

No, sorry. You might have better luck at a local electrical supply house.

@sadfur8728 2 года назад

Are the schematics for the energy meter available anywhere? I connected mine with the shunt ground connected through a BMS and the voltage ground directly to the battery negative. It didn't like it when the BMS cut power and the common mode voltage came up off ground, and burned out somewhere. Curious to see what happened, so schematics would help find out..

@G36934 3 года назад

awesome job!

@undefinednull5749 Год назад

is the meter broken? Why doesn't it show internal resistance ? ?

@jws3925 2 года назад

Why did you not just use a 9v battery?

@gkeith4120 3 года назад

Me. David, why did you bring both the negative 16awg from the battery side of your input cable instead of from the other end of that cable? Thanks

@ronaksoni2729 3 года назад

Very Improvement in design.👍 I am a viewer from india please suggest me online store to purchase lifepo4 100 ah cells The battey hookup don't deliver to india 😭 Please suggest me some guide

@dand9244 3 года назад

are breakers the best option to use as a power switch? i heard they weaken and eventually break with use, that they are not meant to be tripped and reset so often. would it be better to have a breaker for safety and a switch for common use for turning it on/off? neat project david.

@DavidPozEnergy 3 года назад

The breaker I used in this build is rated to break full load with no damage.

@f.k.6151 2 года назад

Can a BMS be installed on a battery that has a built-in BMS? How about a BMS for a sealed gel battery? Thanks

@DavidPozEnergy 2 года назад

A lithium battery only needs one BMS, not sure what application would warrant a second.

3 года назад

Excellent video. Congratulations ! Just one question: Doesn't the shunt heat up inside the plastic box? Isn't there a risk of melting the plastic? I don't know if the shunt gets hot ... thanks! From Brazil - São Paulo

@DavidPozEnergy 3 года назад

No, it doesn't get hot. The shunt is rated for 100 amps, and 75mv drop. Those numbers are printed right on the side. So, worst case, the math is this: 100a*0.075v=7.5w. 7.5 watts of heat energy being dissipated inside the box. That's not a whole lot. And I'm usually running 20 or 30 amps, which is about 2 watts of heat.

3 года назад

@@DavidPozEnergy Good Morning. Thank you very much for your feedback. Now I'm more relaxed. Good weekend

@DIYwithBatteries 3 года назад

Loved it.

@roberte.3541 3 года назад

is there a reason not to solder the lugs onto large electrical cable for instance 4/0 it seems most people crimp them

@DavidPozEnergy 3 года назад

You can solder them if you prefer. It's just hard to get enough heat for a good solder joint with 4/0. I've tried it with a torch, but I made a mess melting the insulation. LOL I've gotten very good, consistent results with a crimper, and it's fast.

@roadsidediagnostics1017 3 года назад

Most automotive batteries wouldn’t spec Watts/Hour. Is there any mathematical way to see the relationship between Amp/Hours. Take an AGM 096 battery listed as 70Ah and 720 cold cranking amps (CCA). Sorry if daft question but only ever used a standard hand held battery tester. Was interested in your Wh tests. Thanks

@DavidPozEnergy 3 года назад

If your example AGM battery is 70ah and 12v, then multiply the two for wh. 840wh. I like to talk about wh or kwh because I've seen confusion before between testing 12v batteries, 24v batteries, and 48v batteries. Heck, I've even tested 36v batteries.

@sailon4me Год назад

Will this battery meter work on an FPV battery?

@Comrade_YG 3 года назад

You did the switch wrong the brass pin is negative and the silver pins are positive

@ralphvanthoff 3 года назад

Top job Dave, just the filing skills need some brushing up ;-)

@benedictcalantoc7115 Год назад

Can you use this for 48v battery too?

@Imagi10 3 года назад

Thanks, if i connect without shunt (in Pzem 013 version) it is safe sir?

@EpalzeoG 3 года назад

Thanks for the nice video. Does it tell you if the battery is in Charge mode or Discharge Mode ? I tried on my side and I am disappointed. My current is always positive wether I am discharging or charging the battery.... Maybe I did something wrong... But hard to know... Thanks in advance if you can confirm or not on your side.

@DavidPozEnergy 3 года назад

I've only used it discharging, IDK

@mawonaful 3 года назад

You know the meter used there. Can it measure both ways? I mean incoming and outgoing currents? Please someone answer this. Im just about to order it now. Sorry for my english hope it is understood the question.

@mrtechie6810 3 года назад

It is not a coulomb meter. It accumulates regardless of the direction.