[cricketo]

That datasheet is a great find! Explains the mystery. Couple of pics of my 14s and 16s ones...

 

[remy_martian]

Was a lot of ctrl-c and ctrl-v on the component placement, lol

Just watch out for the current limit...I didn't get around to measuring the resistor that sets it on the board I have, but it may not balance worth a crap if you're whacking the stack with 30 amps and it's set for a few dozen mA. Those inductors are not very hefty in terms of wire size.

 

[cricketo]

Most Chinese sellers of these boards claim 1.2A, which isn't unreasonable, since we're talking very small voltages and very little resistance (hence little heat). I have used this so far to balance out some Nissan Leaf module packs, seemed to work well. I've wired both the BMS and the balancer with the same GX plug pinouts, and the plan was to make a Y harness so the two can be paralleled, but got busy and didn't get to that. Looking at the board it may be difficult to figure out which resister it is, so next time I'm playing with these I will just clamp a DC current meter around one of the wires, and just measure the current live.

 

[remy_martian]

NFW that inductor will pass 1.2A, imo

The CHIP datasheet claims the chip can do 1.2A...

When I'm back in the "lab", I'll photo the resistor location for you and maybe will try to measure its ohmage (a tribute to "wattage"). Even the resistor is way undersized to do 1.2A, at first glance.

I wasn't going to put more time in it, but I guess I will 🤓

 

[remy_martian]

The resistor reads 51k in circuit (1k reverse polarity, markings 513 are readable in the pic), so the board I have is set for 1.2A* 🧐

*the resistor is not a current sense resistor, but is a setting resistor, which is why it can be so small in size and so high in "ohmage"