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Hi all, can I use an Orion BMS 2 96 cell with 5 Model S batteries? I know its too big but...
 

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Absolutely. The Orion 2 has all the capabilities you'll need (as do a few others).
Here's what I learned about the Orion and Tesla modules:
There's six cells per module. So five modules is thirty cells. On the face of it, an Orion 2 -36 would work, and it does..BUT...if you have anything like a fuse, cutoff, or other high resistance between your first and last cell you may need a different model because of the way the cell tap wiring is done on the Orion. I have six modules, 36 cells. An Orion 2-36 works but I have a mid-pack fuse and cutoff so the proper unit is the 48. The Orion website has a diagram generator and guidance on which unit to get. My advice, flesh out your pack plan as best you can before you buy then buy bigger.
 

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(glitch) continued...
You can use a larger unit for fewer cells according to the manual, "a 108 cell unit can be used with as few as 4 cells".
 
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