JK "split port" relay BMS B2A25SRP

sstephan · May 13, 2024

i saw this "1000A" listed on aliexpress without any wiring diagram or documentation .
asking them questions is like talking to myself .
anyone know what do they mean ? is it external relay (instead of mosfet switches) ?

few more questions ...
what is the best practice when connecting several 16S packs in parallel , each pack with separate bms , or a single one large bms , for example if i have 3 packs of 16S , i need to disassemble the packs , connect each 3 cells in parallel and 16 series to make it one large pack like each cell having triple capacity .

thanks

upnorthandpersonal · May 13, 2024

sstephan said:
is it external relay (instead of mosfet switches) ?

Most likely.

sstephan said:
what is the best practice when connecting several 16S packs in parallel , each pack with separate bms , or a single one large bms ,

My preference is each pack their own BMS and a Class T fuse or equivalent.

sstephan said:
connect each 3 cells in parallel and 16 series to make it one large pack like each cell having triple capacity

I prefer that each cell is individually monitored. In addition it gives flexibility: you can easily add in the future, or take one pack down for maintenance without losing power altogether.

sstephan · May 13, 2024

upnorthandpersonal said:
I prefer that each cell is individually monitored. In addition it gives flexibility: you can easily add in the future, or take one pack down for maintenance without losing power altogether.

that's what i'm thinking also , but then i have a different issue .
let say you have 2 packs , each is 16s with 100A bms , so in total you should get 200A .
in reality it's almost impossible to draw 200A with this arrangement because the current wont be balanced 50/50 between the packs .
is there a solution for this available ?

upnorthandpersonal · May 13, 2024

sstephan said:
in reality it's almost impossible to draw 200A with this arrangement because the current wont be balanced 50/50 between the packs .

It'll be close enough. You can always build in a safety margin, e.g. use a 150A BMS.

ArthurEld · May 13, 2024

sstephan said:
that's what i'm thinking also , but then i have a different issue .
let say you have 2 packs , each is 16s with 100A bms , so in total you should get 200A .
in reality it's almost impossible to draw 200A with this arrangement because the current wont be balanced 50/50 between the packs .
is there a solution for this available ?

JK "split port" relay BMS B2A25SRP

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