Dui ni shuo de dui
100 kW
Mormegil83 said:Just to put the question up front, does anyone know if any of these bluetooth BMS models can handle 72v at peaks of 450a and deliver the CAN signal to a TC Elcon 1.8kw 72v Lithium charger from AliExpress?
Yes, it can handle 450A peak, no problem. We tried pushing more than 600A through the ANT BMS 300A and it worked just fine, still works today.
It just doesn't like it when it lasts more than 10 seconds, at that point it will cut.
As for the CAN signal, I have no idea.
Just a remark: pushing 450A through a 40Ah battery pack made of old laptop cells doesn't sound like a good idea to me. Those cells are really not made to survive for that kind of power draw (that's more than 10C!). If you plan on needing that much power, I suggest you get some proper cells or you double the capacity, at the very least.
Just a little story about my own experience of reclaimed laptop cells:
I work in IT, so I have access to a lot of those. Once, I've bring home around 10 old laptop batteries, opened them and ended up with around 50-70 cells (all good brands, Sony, Panasonic, LG, you name it). Tested all of them, only 40 were still somewhat usable (just meaning they could take a charge, had a reasonable current leak and had a resonable capacity left).
Then I tried to use them on a small e-cig, at reasonable power (around 15 watts if I recall).
Only 3 of them were usable. All the other ones were trash, either they didn't have enough power to heat the resistor, or they would just last less than a few minutes.
My cell charger features a milli ohmeter. It is not super accurate, but it gives an idea. All the defective cells had very high internal resistances, if I believe the milli ohmeter they were all between 80-150mOhm.
The 3 cells that were ok had around 35-40mOhm. At the time, no knowing much, and since I only could compare with the other defective cells, I thought it was good. I could use the e-cig for around half a day before the battery needed to be charged again. The batteries were getting a bit hot during use.
Then, few months later, I purchased a couple Sony VT6.
Gigantic difference. First, the milliohmeter reads around 3-4mOhm. Then, the cells can last 2-3 days without charging, while delivering much more power. And they don't heat at all.
Basically that made me realize that all the cells I had in the first place were complete trash. Not a scientific test, of course, but that gives an idea.
Don't bother using these for a high power project, maybe just keep them for your 12V system or for some other, low power application.