I’m not quite sure how this would work but it would be very helpful for people that bypass there bms. So normally if you bypass the bms you have no control over how much the batteries get discharged but by adding a simple led we should be able to fix this. So basically all you need to do is connect an led or light or any other thing to the output of the small discharge only bms. Now what will happen is that led will stay turned on as long as your cells are charged but when they drop down to the low cut off on the bms it will turn off the led and viola you know that the batteries are flat. In my mind this should work but I haven’t actually tried it. If anyone has a spare bms that can try this for me that would be great as this could help lots of people
Yes it would absolutely work. You would need a resistor in series with the led that would limit the current and thus prevent the led from blowing up. So say for example you would need a 42 kilo ohm resistor to limit the led current to 1mA @42V
Hey guys wanted to update this thread, I feel as though this could be very useful to a lot of members now as more people use charge only bms modules. So the idea is that you wire up the bms normally for charge only but then add a led or similar connected to the bms output, this way the led stays lit when the board is powered but when reaching LVC it will turn off without cutting the power to the board.
In my case I’ve got it set up with my led display showing battery percentage, this way I don’t need a resistor inline with the led and I can see my voltage percent too.