This BMS is just the big brother to the smaller BMS that we have seen so much of in this thread. And when I say big brother, I really mean it! This thing is BIG, but it's also capable of 20-30S and from the factory good for 80 amps. However, everything about it says that 80 amps is just for starters. Replace all those pathetic HY3712 mosfets with much better 150 volt mosfets (AOT2500) and populate all P- 20 positions and there's no reason to believe that 300 - 400 amps is not possible. Otherwise, decent copper busses, lots of places for shunts and lots of places for mosfets. While quite large, this BMS has lots of current handling capability.
The existing mosfets are HY3712's...which are downright horrible mosfets. The original part number is 2SK3712, but this is the Chinese version so we all know that means is sooooo much better. OK no...NOT really. They are 250 volts, 9 amp, 40 watt, 450 milliohm mosfets. Can you say worthless garbage?! Geez...these things are so NOT anything slightly worthwhile it's ridiculous! No wonder with 14 mosfets the BMS is good for 80 amps. I'll obviously be pulling every single one of them out of the P- side and replacing them with AOT2500's. What a garbage mosfet!
The 16/20S version is about 2/5th's the size of this BMS. The 20-30S BMS is a good bit thicker since there's mosfets on both sides of the board.
Like the smaller 16/20S BMS, unsolder a few connections and change the setting in the PC app and this BMS supports 30S. I'll need to add a few wires to the balance cable, but that's super easy.
Does anybody know what you call this rubbery heat sink tape stuff? I'd like to order a roll of it if I knew what it was called.
Replacing those .5w shunts with 2 watt shunts will be easy. There's 10 mosfets per side of the board for both P- and C-. 20 mosfets for decent ones is LOTS of current!
Board top and bottom.