BMS wiring help

[ASK1]

Hi guys, just wanted to double-check before I wire this up - does this look correct? Does the load really go in parallel with the charger? Meaning that all of this can be left connected while the battery charges, and there is no need to disconnect the load? Thanks.

 

[friendly1uk]

Perfectly possible. Regen would put power in this way, and there is no need to disconnect the controller while you charge.

 

[ASK1]

So I wired it up as pictured - I am able to pull power to drive the load (my ebike motor) no problem, but when I try to charge the pack, my charger is not working. I tried removing the load from the parallel (so it is just the charger hooked up to the battery+BMS), and still the same result, no charging. Any ideas why this might be happening?

FYI I triple-checked that all the wiring was correct, I checked all of the voltages between each group on the BMS and all of them were at 3.77 +/- 0.01 V. Battery terminals are reading the expected 49 V. So I'm confident that this is not a wiring issue.

Charger terminals are reading 51.1V across, which is kind of strange because it should be 54.6V.

Edit: Re-checked charger terminals, it's now reading 49.9V. Probably a charger issue here?

Edit2: The charger fuse seems to be blown. No continuity. Not sure how that happened, but I did notice a spark when I connected the charger per my diagram (the charger was not plugged into a power source).

 

[AustinP]

Edit2: The charger fuse seems to be blown. No continuity. Not sure how that happened, but I did notice a spark when I connected the charger per my diagram (the charger was not plugged into a power source).

Not sure what charger you have, but in my experience, most of them strongly recommend plugging the wall end or DC source first (to power on the charger) and then connecting to the battery.

 

[friendly1uk]

While your drawing might be correct, I can't quite sit up enough to see over your bms to see.

Are you sure there is not a B- connection right beside the P-