My first 48 volt battery build, Need info on JK BMS

[MrWCLeo]

Been running solar off grid for one year now. Have 3 rack mount eg4 Lifepower4 batteries in parallel with 2 sets of 4 Litime 12 volt 200 amp batteries in series with balancers. Everything works great so far. I want to build a 48 volt 305 amp pack with a JK BMS. Problem is I don't now which Jk BMS to get. Would like to go 100 amp with 2 amp active balancer. The model numbers are what is confusing to me. You guys are the experts here and help would be greatly appreciated.

 

[Steve_S]

You are building a 305AH Battery, that can discharge @ 1C (305A) for 1 hour and take 152A @ 0.5C to charge for 2 hours. There is absolutely no need to Handicap it ! It's like pulling 2 sparks plugs out of a V8 and replacing them with bolts because you want a V6.
2A Active balancing will work fine with these.

Old Style, with Bluetooth, RS485 or CANbus
B2A24S15P = 150A Discharge Capable / 75A Charge - 2A Active Balancer https://www.aliexpress.us/item/3256803533153296.html
B2A24S20P = 200A Discharge Capable / 100A Charge - 2A Active Balancer https://www.aliexpress.us/item/3256804707762361.html

New Smart Inverter Model (just out) Similar to above but with many more advancements.
JK-PB2A16S15P
JK-PB2A16S20P

https://www.aliexpress.us/item/3256805833785261.html

 

[Skypower]

I’d go with the B2A24S20P . Least troublesome, more robust and very little voltage drop. Costs more but worth it.

 

[MrWCLeo]

Thank you both for the fast response, this site is awesome.

 

[Skypower]

Thank you both for the fast response, this site is awesome.

Thank you for your service