Low voltage heating port

[Dedou]

I was wondering why the heating function of my Jiabaida BMS AP21S001 did not turn on, as my other BMS units do. I measured the heating port, it was only 2.9v, can I use the 5v or 3v heating pad as shown in the picture?

 

[sunshine_eggo]

I was wondering why the heating function of my Jiabaida BMS AP21S001 did not turn on, as my other BMS units do. I measured the heating port, it was only 2.9v, can I use the 5v or 3v heating pad as shown in the picture?

Are you certain that the port is intended to feed both voltage and current to drive the heater, or is it intended as a control relay?

 

[Dedou]

Are you certain that the port is intended to feed both voltage and current to drive the heater, or is it intended as a control relay?

I'm not sure, hopefully both

 

[Rednecktek]

I have similar questions about one of my JK's as well. It's a listed feature but not very well documented.

 

[Dedou]

I measured the port, it is only the control voltage, no current flows. So I use the mosfet relay to control the heaters.

Next question, do 2 pcs of 12v heating pads connected in series work with 24v supply voltage, or do I have to buy 24v heating pads?

 

[Dedou]

Answering myself, I can put 2x12v in series in a 24v system.

The signal voltage of almost all mosfets in Ali's product range is min. 3v, but the bms only gives 2.9v, can someone recommend what I should use as a relay?

 

[sunshine_eggo]

Answering myself, I can put 2x12v in series in a 24v system.

AFTER charging both 12V to full individually and in parallel prior to wiring in series.

 

[Dedou]

AFTER charging both 12V to full individually and in parallel prior to wiring in series.

... 2x12v heating pads, no battery.

 

[sunshine_eggo]

... 2x12v heating pads, no battery.

dagnabbit... wasn't paying enough attention...