Bms voltage?

salmirabile · Feb 6, 2019

Does bms voltage need to match the battery voltage?

I need a 17s 52v bms but can't find any so will a 17s 60v bms be OK to use?

e-beach · Feb 6, 2019

17s at 52v? What kind of cells are you running?

billvon · Feb 6, 2019

salmirabile said:
Does bms voltage need to match the battery voltage?

Yes. Your BMS does no good if it doesn't work with your cell voltage.

I need a 17s 52v bms but can't find any so will a 17s 60v bms be OK to use?

BMSes are rated by cell voltage and string length. If you get a 17s that's good for a li-ion, it will work for a 17S li-ion. For a li-ion battery the max voltage will be 71.4 volts.

e-beach · Feb 6, 2019

How about a 54v bms....

http://www.bestechpower.com/544v17spcmbmspcbforlifepo4batterypack/

Matador · Feb 6, 2019

e-beach said:
How about a 54v bms....

http://www.bestechpower.com/544v17spcmbmspcbforlifepo4batterypack/

Well then you would be talking LiFePO4 chemistry, which has quite a different nominal voltage than most other lithium-ion chemistries (such as NMC, IMN, NCA or LCO).

e-beach · Feb 6, 2019

True, but this is how I think about it. Say you have a 14s LI-ion pack, and you put a LiFePO4 bms on it. You will only charge your cells to 3.65v each, and they will last longer then cells charged to 4.2v while not loosing too many watts due to undercharging.

Bms voltage?

salmirabile

1 mW

e-beach

10 MW

billvon

1 MW

e-beach

10 MW

Matador

100 kW

e-beach

10 MW

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