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DGJBD Bluetooth BMS - a short review

Hi Pierre
Thanks for your review.
Been down your way in 1995 when south Africa won the world cup. Was in Joberg for the celebrations.
Spent 3mth travelling all round south Africa and Zimbabwe.
Walked up table mountain twice.
Cape town was my favorite spot. Less violence. friendly people those colored Africans, shared a beer with one in the back of a bus.

Back to the BMS (combined charge/discharge terminal)
When the BMS is in LV disconnect, will it still allow charge current through to charge. I assume when there is a higher voltage on the charge side of the mosfet than the battery side then the mosfet will turn on to allow charge current to flow. I think they would by n type mosfet as they seem to be switching the battery negative.
And in HV or HI current disconnect when will or in what condition will the load be reconnected to the battery.
Some BMS 's split the charge/discharge leads to allow for this.

Hi Thedodgeronlin
Your the closest poster to where i live that i have found on this forum
I live in Agnes water and most of my family live around Noosa heads.
 
Last edited:
Hi @grey nomad , thanks for your post and very pleased that you enjoyed your visit to ZA. The Cape will not be the same without our beloved brown people ! They are indeed one of a kind with their quick wit and friendliness. They speak a mixture of Afrikaans / English / Malay and many colloquialisms.
You can set the OV and recovery points on the BMS. As soon as the load current exceeds the charge current ( if any ) and the recovery point is reached the load will be re-connected. I have sat here watching the BMS toggle between load / no load and charge / no charge conditions without having to reset anything. The FETs just merily switch between on and off .
@thedodgersonline is also an avid user of this BMS and we have had a few interactions as you can see from my review. I know he is not to happy with the BT (Blue tooth) coverage - I wonder if he ever soldered that little antenna on as I suggested ;) .
 
Hows it Pierre
My parents are Dutch and have a uncle that lived in Durban. I don't think he had trouble picking up the Africans language.
Like you i like the idea of using a laptop to communicate with BMS
I found a youtube video
that you may have not seen that mentions a guy that has played with the program and has a manual and latest software. It maybe of some use. https://hackaday.io/project/162806-jbd-bms-protocol.
I haven't made up my mind as to weather to go with 2 ea 12v 150ah bateries , one for redundency or 1 only 280ah from XUBA alibarba supplier that a lot of people on here has purchase and said they where a good deal.
In your experience have you found if a battery was going to fail, do you get any prior warning.(eg bad cell)
I would like to have some backup for my essential power to fridges.
 
grey nomad said:
Hows it Pierre
My parents are Dutch and have a uncle that lived in Durban. I don't think he had trouble picking up the Africans language.
Like you i like the idea of using a laptop to communicate with BMS
I found a youtube video
that you may have not seen that mentions a guy that has played with the program and has a manual and latest software. It maybe of some use. https://hackaday.io/project/162806-jbd-bms-protocol.
I haven't made up my mind as to weather to go with 2 ea 12v 150ah bateries , one for redundency or 1 only 280ah from XUBA alibarba supplier that a lot of people on here has purchase and said they where a good deal.
In your experience have you found if a battery was going to fail, do you get any prior warning.(eg bad cell)
I would like to have some backup for my essential power to fridges.
Click to expand...
Hi Nomad , I have been using the Hackaday files as mentioned in my review.
I use both the BT and RS485/232 apps with great success. The Xuba batteries seem to be very popular and I would go for the 1 x 280Ah Xuba because 2 x parallel batteries call for 2 x BMS's if you want to monitor each cell individually and track their performance. You can predict from the cell voltage if a particular cell is out of 'balance' with the rest in the pack. As long as all the cells track say within 50 - 80mV of each other ( I am achieving 3 - 20mV cells delta with A grade cells ) on the flat portion of the discharge curve you will be o.k. . Sometimes cells tend to drift further apart once the pack reaches the 'knees' on the charge / discharge curve.
Monitoring the performance of the individual cells will help you to predict an early cell failure. Cells do not just fail in an instant under normal use and rather gradually degrade.
 
pierre said:
Have you soldered that wire antenna onto the BT yet for extra range ?
Click to expand...
Hi Pierre
Not yet no as I am busy on rebuilding my camper. Built 3 more slim batteries as well and busy cycling and load testing them so my battery is on the back burner at the minute.

Regards
 
grey nomad said:
Hi Thedodgeronlin
Your the closest poster to where i live that i have found on this forum
I live in Agnes water and most of my family live around Noosa heads.
Click to expand...
Hi grey nomad

Yes, just a bit south of you. Wamuran but I do envy you. Love it up there. 1770 and snorkeling. Ex work colleague (Stuart McAlpine) lives there in Agnes Waters as well.

If I can be of any assistance drop me a line

Regards
 
thedodgersonline said:
Hi Pierre
Not yet no as I am busy on rebuilding my camper. Built 3 more slim batteries as well and busy cycling and load testing them so my battery is on the back burner at the minute.

Regards
Click to expand...
Hi Dodger
Trust you are well and nice to hear from you. Keep us posted. I am playing around with a Raspberry Pi 4B . Oh dear , lots of programming to master. Want to use it to gather performance data on the packs etc.
 
Hey All,
I just built my 4s 280Ah pack from xuba and am using this BMS. I thought I ordered the computer connection, but it didn't arrive.
I'm connecting to the battery via the Android app perfectly.
I havent tried any load or charging the batteries yet. Because I dont want to break anything.

I noticed one of the cells is not accurate. My multimeter is showing slightly different.

Screenshot_20200807-092542_xiaoxiang.jpg

Also, when I unplug the Balance leads to ”turn off” the battery. The voltage drops to 12.83V. I thought it would power off? Completely. When bluetooth is back plugged in the multimeter shows normal voltage.

Thanks for your help
 
Last edited:
Update!
So I connected a load to the battery and it switched it off when I removed balance leads. Still reads 12.83V. I dont understand how it does that. I'm assuming it allows a teeny bit of current through showing a residual voltage (because its not accurate voltage)

Apart from putting the cell capacity and cycle capacity (I did 280 and 210 respectively). I havent really done much else.

Am I right to just charge it and use it now?
 
idontknowwhatimdoing said:
Update!
So I connected a load to the battery and it switched it off when I removed balance leads. Still reads 12.83V. I dont understand how it does that. I'm assuming it allows a teeny bit of current through showing a residual voltage (because its not accurate voltage)

Apart from putting the cell capacity and cycle capacity (I did 280 and 210 respectively). I havent really done much else.

Am I right to just charge it and use it now?
Click to expand...
Hi
Generally if I notice a difference in cells I join all in parallel and let them balance. Once they are balanced I connect them in series and connect the BMS etc then cycle them ( charge fully then discharge fully) a few times to get true capacity.
When you “turn off” the battery do you use the little buttons at the bottom left of the screen? I find when I switch the load off that way the voltage is still there but decays very quickly.
Generally not a good idea to remove balance leads with the BMS connected I believe.
Hope this helps.
 
idontknowwhatimdoing said:
Hey All,
I just built my 4s 280Ah pack from xuba and am using this BMS. I thought I ordered the computer connection, but it didn't arrive.
I'm connecting to the battery via the Android app perfectly.
I havent tried any load or charging the batteries yet. Because I dont want to break anything.

I noticed one of the cells is not accurate. My multimeter is showing slightly different.

View attachment 19263

Also, when I unplug the Balance leads to ”turn off” the battery. The voltage drops to 12.83V. I thought it would power off? Completely. When bluetooth is back plugged in the multimeter shows normal voltage.

Thanks for your help
Click to expand...
Not to worry - cells delta is only 11mV. Do as Dodger says and do a few charge / discharge cycles first.
 
pierre said:
Hi Dodger
Trust you are well and nice to hear from you. Keep us posted. I am playing around with a Raspberry Pi 4B . Oh dear , lots of programming to master. Want to use it to gather performance data on the packs etc.
Click to expand...
Hi Pierre

you might be interested in this capacity load battery tester thingy (on my 3rd one now) anyway has Bluetooth and a port you can connect to a computer to gather data while the battery is under test. Great thing is that the low level volt cut off work too. Still max 185w but that is adequate.
If you look on the Ali list I g there is a path to where you can download the programme to your computer to link to the tester.

link
AU $41.47 26％ Off | DL24/P Color 2.4" DC USB tester electronic load lithium battery capacity monitor discharge charge power meter supply checker APP
a.aliexpress.com

34.22US $ 20% OFF|DL24/P Color 2.4" DC USB tester electronic load lithium battery capacity monitor discharge charge power meter supply checker APP|Battery Testers| - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com

enjoy
 

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My JBD 120a finally arrived yesterday and I must say fairly impressed with the build quality of this little unit and looking forward to commissioning and testing.
Is everyone happy with the size of the 3x b- and c- wires or have you been upgrading to larger wire size?
 
Sharky722 said:
My JBD 120a finally arrived yesterday and I must say fairly impressed with the build quality of this little unit and looking forward to commissioning and testing.
Is everyone happy with the size of the 3x b- and c- wires or have you been upgrading to larger wire size?
Click to expand...
Hi
Have not changed them at all, but then I have not been testing g at high amps. Still waiting for my 100a capacity tester then will run one cycle at as high as I can. I don’t think there will be any issues though.
Regards
 
thedodgersonline said:
Hi
Have not changed them at all, but then I have not been testing g at high amps. Still waiting for my 100a capacity tester then will run one cycle at as high as I can. I don’t think there will be any issues though.
Regards
Click to expand...
Just read that 10awg silicone wire is good for 120a ? so I think I'll leave as is then.
What capacity tester did you get
 
thedodgersonline said:
Hi Pierre

you might be interested in this capacity load battery tester thingy (on my 3rd one now) anyway has Bluetooth and a port you can connect to a computer to gather data while the battery is under test. Great thing is that the low level volt cut off work too. Still max 185w but that is adequate.
If you look on the Ali list I g there is a path to where you can download the programme to your computer to link to the tester.

link
AU $41.47 26％ Off | DL24/P Color 2.4" DC USB tester electronic load lithium battery capacity monitor discharge charge power meter supply checker APP
a.aliexpress.com

34.22US $ 20% OFF|DL24/P Color 2.4" DC USB tester electronic load lithium battery capacity monitor discharge charge power meter supply checker APP|Battery Testers| - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com

enjoy
Click to expand...
Nice piece of kit , Dodge. You say 'your 3rd one' ? Are they all in use somewhere or have the other 2 gone 'tits up' ? ;) :unsure: .
Trust you are keeping great , mate.
 
Sharky722 said:
My JBD 120a finally arrived yesterday and I must say fairly impressed with the build quality of this little unit and looking forward to commissioning and testing.
Is everyone happy with the size of the 3x b- and c- wires or have you been upgrading to larger wire size?
Click to expand...
You should be fine - only 40 amps per wire on full load and the lengts are so short , so you will be o.k.
Both Dodge and I can vouch for the unit -- great buy. Both of us have done extensive testing on it and tests are ongoing.
 
pierre said:
You should be fine - only 40 amps per wire on full load and the lengts are so short , so you will be o.k.
Both Dodge and I can vouch for the unit -- great buy. Both of us have done extensive testing on it and tests are ongoing.
Click to expand...
Yes that's what thought also.
So what's the general final topology. 3 separate lugs or try and merge all 3 into 1 lug?.
 
Sharky722 said:
Yes that's what thought also.
So what's the general final topology. 3 separate lugs or try and merge all 3 into 1 lug?.
Click to expand...
Just leave as is. If it ain't broke don't fix it. I put a small bolt / washers and nut through all three and then also the larger single cable with its ring terminal. Heatshrink the joint and there you go. So much easier in future for fault finding / repair etc.
 
pierre said:
Nice piece of kit , Dodge. You say 'your 3rd one' ? Are they all in use somewhere or have the other 2 gone 'tits up' ? ;) :unsure: .
Trust you are keeping great , mate.
Click to expand...
Hi Pierre
The magic smoke escaped. Overload protection was tied to the smoke so went to the capacity tester in the sky. This one seems the goods.
Cheers
 
pierre said:
Just leave as is. If it ain't broke don't fix it. I put a small bolt / washers and nut through all three and then also the larger single cable with its ring terminal. Heatshrink the joint and there you go. So much easier in future for fault finding / repair etc.
Click to expand...
Copy that.
Looking forward to doing my own testing on the bms when this capacity testing is out of the way.
 
Sharky722 said:
Just read that 10awg silicone wire is good for 120a ? so I think I'll leave as is then.
What capacity tester did you get
Click to expand...
Hi

waiting for this one to pitch up
AU $15.49 31％ Off | 300V 100A DC digital voltmeter ammeter voltage meter car battery capacity volt current wattmeter detector power supply tester
a.aliexpress.com

15.86US $ |300v 100a Dc Digital Voltmeter Ammeter Voltage Meter Car Battery Capacity Volt Current Wattmeter Detector Power Supply Tester - Voltage Meters - AliExpress

Smarter Shopping, Better Living! Aliexpress.com
a.aliexpress.com a.aliexpress.com

Regards
 
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