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Good Chinese BMS review
#51
Hello,
Is posible fits 2 or 3 bms of 100A in parallel to manage 200-300 A of big powerwall with small and standard chinese bms ?
Thanks
Best regards
Luis
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#52
(06-15-2019, 10:12 PM)Luis Wrote: Hello,
Is posible fits 2 or 3 bms of 100A in parallel to manage 200-300 A of big powerwall with small and standard chinese bms ?
Thanks
Best regards
Luis

sort of ... no.

problem 1:  the disconnect voltage will be too low for large packs/strings.  whereas a 'small' (<50p) string/battery may bounce back ok, after discharge has been cutoff ... when you get to like 150p (~300AH) ... you will find that they don't 'bounce back' that much, unless the load was anywhere near C2 or even C4 might bounce back, but if you discharge at C10 (all capacity drained after 10 hours) then you probably will find your cells at a very low (~2.45V) voltage after cutoff.

problem 2: the balance/overcharge protection is basically useless, as it will likely go to 4.25V (or more!) before cutting off charge, and trying to 'balance' ,... (segway)

problem 3: you will never get any useful balance current/effect on the cheap ones, which are often limited to ~50mA of balance current.  might be better than nothing, but ... not really.

My suggestion would be to go to either a higher voltage (more s's), OR ... if that doesn't suit, and you still don't want to pay ($$) for good solution, then investigate Voltage Sensitive (controlled) Relays.  It might not be perfect (doesn't protect banks/cells from going low) it DOES stop strings/batteries getting out of control ... *shrug*.  Hope This Helps!
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#53
Anyone gut any luck reading these BMS with a Bluetooth/Raspberry kind of setup? Would be interested too...
Only thing I found so far is this https://github.com/sw-home/FHEM-BluetoothSmartBMS, will try if I'm at my battery next time(remote location)
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