What BMS should I get?

[John Frum]

Does anyone know if the JBD 120A 4s BMS off of Srikobatteries can be connected in series safely?

Probably can but the current limit would still be 120amps.

 

[Dutchboy69]

Check out the QUCC ones. They offer a contactor-based unit. The Offgrid Garage has used them.
I am getting a couple in the new year as well for my 2 400 ah 48 volt Lithium Packs.

 

[DJSmiley]

Probably can but the current limit would still be 120amps.

Or the 4S 200A, that provides the 200A.

Those can be connected to up to 4 strings in series.

But a single 8S BMS might be a better option.
For the contactor-based ones... I'm not a real fan of those. Carefull look for their consumption. Some cheaper contactor based ones have a quite high continous current draw (keep the contactor connected).

The JK 8S 200A might be a better option compared to 2 seperate 4S BMSses. It also allows you to use a single app to see all cells (unlike 2x 4S in series - you have to switch between the both BT modules to see the readings).
Also it has a higher balance current. (50mA for the 120A JBD, 150mA for the 200A JBD, 2A for the JK)

 

[RossA]

Or the 4S 200A, that provides the 200A.

Those can be connected to up to 4 strings in series.

But a single 8S BMS might be a better option.
For the contactor-based ones... I'm not a real fan of those. Carefull look for their consumption. Some cheaper contactor based ones have a quite high continous current draw (keep the contactor connected).

The JK 8S 200A might be a better option compared to 2 seperate 4S BMSses. It also allows you to use a single app to see all cells (unlike 2x 4S in series - you have to switch between the both BT modules to see the readings).
Also it has a higher balance current. (50mA for the 120A JBD, 150mA for the 200A JBD, 2A for the JK)

Yeah, i wanted to find a capable 8S BMS. I really like the features that the JK BMS has, and really feel like it was the best option. So that's what I ordered.

 

[John Frum]

Yeah, i wanted to find a capable 8S BMS. I really like the features that the JK BMS has, and really feel like it was the best option. So that's what I ordered.

Is that the one that requires a buck converter to run?

 

[RossA]

Is that the one that requires a buck converter to run?

I don't believe so. It does need an outside source to start it up, but despite that, the Offgrid garage guy says it's by far his favorite BMS. He did a review of all the brands recently and had never tried the JK BMS. Once he did he was convinced it was the best.

 

[jamiegreen]

Is that the one that requires a buck converter to run?

That was the early JK BMS that was designed for a minimum pack voltage of 48v. They've since (by popular demand) designed their BMS's to run on the desired pack voltage your trying to protect.

 

[Maintenance guy]

45.94US $ 29% OFF|Jk Bms 1a 2a 5a Balance Current 8s 12s 13s 14s 16s 17s 20s 24s Smart Jk Bms 60a 80a 100a 150a 200a 600a Lifepo4 Li-ion Battery - Battery Accessories & Charger Accessories - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

definitely overkill at 600a

 

[hwse]

Is that the one that requires a buck converter to run?

The 2A8S20P will run on the native 24v nominal voltage on an 8s pack. It can also be used for a 4s pack but that would require a boost converter to get from 12v up to 24v. I am hearing that they will come out with a 4s BMS in March.

 

[Bluedog225]

Yes it is.

Well spit. I didn’t know this. Thanks!

 

[ericfx1984]

AMY from dorcan has the 200a