New chineese bms with 1.2a balance

daromer

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Looks a smart little board. Note that it can most likely NOT sustain 1A balancing current for any longer period of time. They only have 1 resistor per port at 3.3ohm and imagine balancing at that rate on all you would get a whopping 42Watt. Impossible to get rid of that heat fast enough :)

So I would say concurrent balancing current is most likely around 100-200mA per port but still nice thing!
 

Korishan

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Interesting arrangement, too. It's nice that the balancing traces are much heavier than the others. So there was actually some forethought put into the board design.

Nice find :)
 

jdeadman

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Mar 28, 2017
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Very nice idea but I agree with Daniel, 1A on those little resistors will blow them up pretty quick. I use 3 Ohm 10 Watt Resistors (the big white bricks) to manually pull down cells that are too high before assembling a pack and they draw just over 1A and I can only run them for about 20 min at a time before they get too hot.


But if they had a really good heatsink and a fan they might work on a lesser duty cycle
 

higher_wire

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Aug 30, 2017
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Discharge current is only 20a. No mention of charge current, but Id guess the same?
 
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