Took the CroBorg out for a beautiful evening spin after work. Not a great cellphone pic, but it was nice to get out and enjoy the great weather we are having.
This motor is really docile at 12S / 48V. It glides along at 25-27 mph effortlessly, and climbs 10% grades at about 12 mph. The throttle is not touchy (like it was at 22S) and it is really pleasant to ride. It is really tempting to make a 12S/24S switching system for those moments you want to "go fast", and run 12S the rest of the time.
It is not too hard to make a series/parallel system, but I don't think I want to deal with the issues it brings. It would be a good match for the battery setup because two 12S 4P battery setups would fit nicely giving 12S 8P 48V 40AH for just under 2 KWH of battery.
I don't want to run at 24S normally because it is too close to the voltage ratings, there is not enough margin. With a 12/24 system it would not be at the 24S setting much, and the stress would be reduced.
It would certainly change the character of the machine from docile to wild. I think though I want something in between for every day. 12S is too docile, and 24S is too wild. 18S sounds really nice.
I may be able to fit a "backup" 18S pack in the extra frame space based on three of the 6S 8AH Zippys. That would bring the total pack up to 70V 28AH which is 2KWH.
I picked up some Corrugated plastic sheet at Tap Plastics today. I will be working on the main battery pack very soon.