@TimWescott - (see edits above) - that's the question I'm asking. In theory, the BMS can be commanded to turn on and off at will, and will do so automatically upon discovery of error. all series packs will be designed into the same board, but technically, could be considered independent, but not modular. The only time you'd have charge imbalance across strings is when there's possible cell damage in the pack at which point the individual BMS chips will shut down the string, leaving the other 4 in use. This includes shutdown of charge cycle. But is this sufficient to string 5 packs in parallel?

@ThePhoton SFP is differential, running at 125MHz, not sure about the lower end though. I know the lowest TYPICALLY used with SFP is 10Mbps, but that's it..

@user1850479 Thanks, but can I use it over 1km distance? RS485 is good to 4000ft, but I can't use copper in this instance.

@Andyaka unfortunately, that's not my call to make. I'm just an employee, I don't have a say in what they block here at the office...

@Andyaka Thanks, but I'm using a work computer and discord is blocked on our systems

Aah, I see. Amin did not specify that there was a previous post. I just posted an answer to THIS post, not the previous one that he didn't mention.

@ChrisStratton, one of us misread his problem statement, re-read it and then see my answer to Arsenal.

@Arsenal if he's looking for a USB to dual UART, then the FTDI solution is the one he should investigate. But I gave him the option of the SPI to UART because I got the impression that he was uncertain about the USB, and did say "Any advice or opinion is appreciated"...

Correction: Power = (Torque * Speed)/5252