Yeah, sure, but switching is actually a huge part of the heat generation on a CPU. In a BMS during discharge, there should be no switching as long as everything works fine and you don't go over one of the 3 limits I've mentionned before.
What is different on your BMS? Do you have a link?
There is one sink (actually just an aluminum plate) on each side of the BMS. One is for the balance board, the other for the FETs. So two sinks in total.
It was barely above the ambient temperature after a 55km ride.
Ambient temp was around 36-39 degrees (it is terribly hot here these days), BMS was around 42 if I remember correctly.
That's why I say that heating shouldn't really be much of a concern, it just doesn't heat.
One thing to note though is that my BMS is outside of my battery. It has its own 3D printed box with cooling holes. But I doubt this makes for a really huge difference, maybe it would heat 2-3 degree C more in a sealed enclosure? Pretty sure it is not game changing.
I'm over 120A battery draw from 25km/h to the top speed (120km/h). So pretty much everytime I hit the throttle. Of course at stabilized speeds this rating drops down a lot. A few figures at stabilized speeds for your reference:
-18A @ 50km/h
-30A @ 70km/h
-80A @ 100km/h
-about 120A @ top speed.
A few figures during full acceleration:
-50A from 0-10km/h (starting current)
-90A from 10-25km/h
-120 from 20-30 km/h
-150 from 30-40 km/h
-180 from 40-50 km/h
-200-210 from 50-100km/h
Then it progressively goes down to 120A until max speed (120km/h)
My start current is a bit low but unfortunately I don't know if this can be changed on my sabvoton controller
I have a tendency to go really heavy on the throttle, more than anyone I know, so I run at max acceleration most of the time, unless of course if the road is too crowded. To answer your question, I'd say that my motorbike is capable of doing the 0-100km/h in 6 or 7 seconds. So the BMS has to support that kind of load for maybe 90% of this time.
Sure, I have absolutely no problem with that . Ask any question you want, I'll be glad to answer if I can.
If you want me to make a particular test for you or to confirm some figures don't hesitate. I was a bit hesitating too when I bought this BMS (seemed too good to be true to me) so I totally understand. The only thing I've not tested yet it the bluetooth app, I'll hopefully be able to check it this evening.