DGJBD Bluetooth BMS - a short review

Your cells delta V is perfect ! I ordered the new batch on Alibaba but tracking info is sketchy at best - apparently in customs clearance at the moment and I think delivery will only take place after lockdown is lifted.
Yeah , CT is a special place to many. Where are you located now ? Our lockdown has been extended to end April and the place is like a ghost town and authorities are very strict about outside movements - offenders getting arrested and huge fines levied. Can only get essential deliveries like food / meds . I want to order a Klein Clamp meter from the US to measure DC current but shipping is dodgy at the moment.

Hi Pierre
Lived Pietermaritzburg, then Durban, then Melbourne and now Sunshine Coast hinterland.
I use 17net for tracking. Seems to work well with Chinese shippers. If buying from the US of A I use a service like ReShip or ShipItTo. They are great and not that expensive. I have them setup as an address on Amazon and select that for shipping.
We are under lockdown too, but can go out ‘for essentials’ but deliveries are working well. Online shopping works really well. Am about to buy some more cells too. Will get them from Amy on AliBaba.
Cheers.

Hi Dodger , so you know ZA very well ! You live in a lovely part of the world now. I also make use of USaddress in NJ for USA shipments - they also consolidate a few parcels and send out 1 box. These days my orders from the States are rather small and I rather make use of Amazon / Ebay with their International Shipping Program , so all import duties / VAT are paid up front when you pay for your goods.
No wonder you got your order so quickly - China is just up the drag from you . Which company is Amy with ? Her name seems to come up quite often.
Keep that BMS humming.
Regards

Amy is with Shenzhen Xuba - everyone seems very happy with their service / products.

First time that I really tested the BMS over discharge current protection happened yesterday when I plugged in (without thinking) a vacuum cleaner rated at 230v 1800w. This equates to a constant current demand of around 140a from the battery. However the inrush current on start up must have been quite a bit higher. The VC ran for about 5 sec before the BMS and inverter OC protection activated , disconnecting the load. Which one disconnected first I cannot tell for sure as both devices indicated an over current alarm. The OC setting on the BMS at present is 130a and I am very satisfied with this result. Testing is ongoing and until now I have only praise for this device.

pierre said:

I have been playing with this BMS for a while now and must must say that I am very satisfied with the performance. All the protection functions work great - the only one that I have not tested is the 'low temp cut off'.
Testing is ongoing and I will report on future performance.
For $68 this is a one of the best BMS buys out there ! As Will always says " I am not sponsored and bought it with my own money"

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Hey Pierre;

Thank you for this thread, it's making me consider experimenting with it to see if it will suit my needs, which is not solar, but marine deep draw. Looks like the price of the BMS has come down and even cells are amazingly cheap now. Can you tell me, for that $68 did it include the bluetooth module that works with Apple? Did you have to order a GPRS module? I looked at battery hookup and not only were they out of stock, but they didn't have the 120A version that I must have, so I guess I'll get this one on Alibaba? Is this the same one you're using?

I'm going to try to connect two 12v 120Ah batteries with this BMS in series to make 24v. My amp draw is low, max 60 amps, circuit breaker limited, so I'm going to take my chances. You think that's possible?

Lol, I'm also going to experiment with one of these as a marine engine starting battery, about 250-300 amps. I've seen drop-ins like Battleborn do it with only a 100A BMS. I hope the high amp draw of these cell types won't fry my 60 amp alternator. If anyone has ideas to restrict charge draw to soften the pull on a car/marine alternator, please let me know. I've thought of a DC/DC charger, but then I'd still need a lead-acid battery for the engine alternator to hook up to, and space is limited.

Hi Fish Freak , thanks for your interest. I got mine on Alibaba from : https://www.alibaba.com/product-det...13.html?spm=a2700.12243863.0.0.2dee3e5fmAkZRT. Cherry gave excellent service and replied to all my emails etc.
It looks like the one you refer to in your post with the leads already soldered to the pads.
Came complete with Bluetooth dongle and UART/ RS232 interface with cable to connect to PC. You can download the Apple app from the APP Store.
Follow my other links to download the drivers for PC.
Are you going to assemble the 2 x 12v packs for series connection yourself from LFP cells ? In this case you would need an 8S BMS.
'Drop in' replacements like Battleborn have the BMS already built in. Just make sure that the pre-built packs you buy can be connected in series.
I have seen a few ideas on the forum re switching heavy loads and also alternator protection etc. Enjoy the experimentation.

pierre said:

Hi Fish Freak , thanks for your interest. I got mine on Alibaba from : https://www.alibaba.com/product-det...13.html?spm=a2700.12243863.0.0.2dee3e5fmAkZRT. Cherry gave excellent service and replied to all my emails etc.
It looks like the one you refer to in your post with the leads already soldered to the pads.
Came complete with Bluetooth dongle and UART/ RS232 interface with cable to connect to PC. You can download the Apple app from the APP Store.
Follow my other links to download the drivers for PC.
Are you going to assemble the 2 x 12v packs for series connection yourself from LFP cells ? In this case you would need an 8S BMS.
'Drop in' replacements like Battleborn have the BMS already built in. Just make sure that the pre-built packs you buy can be connected in series.
I have seen a few ideas on the forum re switching heavy loads and also alternator protection etc. Enjoy the experimentation.

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Thank you Pierre;

I can't use 8s bms 24v because my electrical system works better with modular 12v cells: 12v for starting, and 24v or 36v for electric propulsion. Plus a/c charging system is designed to charge 4 - 12v lead deep cycle batteries. The loads aren't that heavy, on the electric motor 60 amp breaker, average draw is usually half that. If I've made two 12v 100 Ah batteries with their own BMS, and separate 12v charging, why does the BMS care if it's used solo or two batteries in series? Is it a balance problem? What's the difference.

The amp draw is the same, all circumstances, is that not correct? Hold my beer. What could possibly go wrong?

Fish Freak said:

Thank you Pierre;

I can't use 8s bms 24v because my electrical system works better with modular 12v cells: 12v for starting, and 24v or 36v for electric propulsion. Plus a/c charging system is designed to charge 4 - 12v lead deep cycle batteries. The loads aren't that heavy, on the electric motor 60 amp breaker, average draw is usually half that. If I've made two 12v 100 Ah batteries with their own BMS, and separate 12v charging, why does the BMS care if it's used solo or two batteries in series? Is it a balance problem? What's the difference.

The amp draw is the same, all circumstances, is that not correct? Hold my beer. What could possibly go wrong?

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Hi FF , my experiments thus far only involve single 12v packs for camping / off roading and I have not experimented with multiple packs in series. I do not want to give you incorrect info or advice - maybe someone more informed can assist here.

So far very satisfied with this BMS and all its functionality. For now I am moving on to testing another BMS.

pierre said:

So far very satisfied with this BMS and all its functionality. For now I am moving on to testing another BMS.

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Hi mate
Have you found a better app to use with this BMS? I fi d the one they supply / recommend very crappy. Been looking for something different / better

regards

thedodgersonline said:

Hi mate
Have you found a better app to use with this BMS? I fi d the one they supply / recommend very crappy. Been looking for something different / better

regards

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Hi Dodger , I am just using the one downloaded from the iStore onto my iPad. Had to pay a few $ to get configuration functionality though. Works fine for me. For full functionality you will have to connect to your PC via UART / RS232.
Should you find something better please let me know. Regards.

thedodgersonline said:

Hi mate
Have you found a better app to use with this BMS? I fi d the one they supply / recommend very crappy. Been looking for something different / better

regards

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Hi dodger
I was just looking at Wills videos for this bms and he said he has the enterprise version for download on the website.
I'm looking at this bms for my rig.

Sharky722 said:

Hi dodger
I was just looking at Wills videos for this bms and he said he has the enterprise version for download on the website.
I'm looking at this bms for my rig.

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Hi Sharky722
No link that I could find - for IOS anyway. If you find one perhaps you can put up the link.
Regards

I ordered 3 JBD-SP04 BMS and 3 Bluetooth adapters. Has anybody have experience using more that BMS with the app?

thedodgersonline said:

Hi Sharky722
No link that I could find - for IOS anyway. If you find one perhaps you can put up the link.
Regards

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Android link is at the bottom of this page: https://www.mobile-solarpower.com/raw-lifepo4-deals-page-676969.html

The Apple app is on the App store, but you have to pay $7 or something for the app to change settings.

Fish Freak said:

Android link is at the bottom of this page: https://www.mobile-solarpower.com/raw-lifepo4-deals-page-676969.html

The Apple app is on the App store, but you have to pay $7 or something for the app to change settings.

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Hi Fish Freak
Thanks for this. I have the app ( purchased it off the App Store) but looking for something better.
Regards

thedodgersonline said:

Hi Fish Freak
Thanks for this. I have the app ( purchased it off the App Store) but looking for something better.
Regards

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What are you looking for that isn't in the current App?

Bob B said:

What are you looking for that isn't in the current App?

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Hi
Decent graphics really - just cosmetic.
Regards

pierre said:

I have been playing with this BMS for a while now and must must say that I am very satisfied with the performance. All the protection functions work great - the only one that I have not tested is the 'low temp cut off'. This unit has two NTC sensors - the one is on a fly lead but the other one is embedded somewhere in the build. I have dunked the one (on the fly lead) into a glass of melting ice but it did not shut off. My contention is that both sensor inputs are required to trigger a 'shut off' and that implies that I will have to 'freeze' the complete unit as Will P does.

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I had what I thought was a problem when testing the low temp cutoff. It seems to be a odd "feature" of the controller that was throwing me off. I expected in the battery status display to see the charging switch go to OFF when temperature is out of range and I was verifying it with a small current from a LED. Turns out you need (in my 120a version) at least 1 amp of charging before it will shut off. If your not actually charging it will not shut off. I found it only was effected by the thermistor on the wire. But I see in some version of the software there is a on/off (yes/no) for each thermistor. Attached is a photo of the location of the on board #2 thermistor, At the end of the row of FETs. So It appears to work. I wounder why everybody that sells these are so reluctant to provide any documentation.