What I have:
1 Lyen low rds 18 fet delux regen controller.
1 Crystalyte 5302 straight laced into a 16" moped rim (aka a beefy 20" bike rim)
18 40ah thundersky cells.
24 "mini-bms" distributed style bms modules
1 50lb Walmart hyper insight suspension recumbent with custom triple tree clamp front end and dirtbike forks.
What I'd like to do:
Hit about a 35 MPH top speed.
Haul a couple hundred pounds in a trailer around without murdering my controller.
Hit hills with some gusto, zip around off road, and just generally feel a nice kick in my pants as I accelerate from a stop.
Use regen as my primary braking system.
If it is at all possible I'd like to pull this off using a simple 12s configuration. I could get the other 6 cells on the bike if I needed to, but these things weigh a shit tonne, and I'm just not all that keen on hauling an extra 10kgs around if can avoid it, since there is pretty much no way to get that weight any lower than seat level on this bike. Not to mention that my 2kw charger would barely be scratching the surface of the charge rate limits on 12 cells, never mind 18.
My motor does seem to be wound for almost comically high speeds, and if there is anything a 40ah cell is good at, its dumping assloads of current into the mains, so I'm guessing this should be reasonably feasable, but I'm just not 100% on what all is going on with the controller settings. Running my configuration at 38v and 60a through the ebikes.ca simulator yielded a top speed of 33mph, but with fairly dismal looking thrust curve, I'm guessing that PWM with take care of the poor thrust, but again, I'm just not sure what settings to fool with, or what limits would be safe.
Edit: OK, so after looking at the simulator a little more closely, it seems that for range reasons I am much better off running the higher voltage and laying off the throttle than I am running a low voltage and cranking up the throttle. So I suppose I will just have to figure out a way to make all 18 work and live with the weight, but otherwise the same question stands.