lebnjay said:
Thanks for that thebeastie and d8veh,
Sounds like I might be better off with a bigger pack for the cargo bike attatchment, but I still think the small pack would be good for my wifes bike. She won't be pulling many amps and I would guess that she will rarely go over 10 miles, more often closer to 5. And her frame is a step through, so very little room in the triangle, anyone fit a dolphin or shark or bottle battery in a step through ladies frame? Its a trek 830.
I was initially thinking two small packs, one for hers and one for the cargo bike when we are riding together, then when I take the cargo bike to work I could take both the small packs together.
I am still considering mid-drive, but the cargo bike attatchment uses a bracket that is installed at the bottom bracket, so I don't think it will be compatible with the bbs02. And for my wifes I was leaning towards the front hub for a lower cost, lower power, simpler system.
Has anyone tried pushing a 52v/14s pack on a bmsbattery sine wave controller like the s12s or s12sn, or their integrated controller in the battery 09 case?
Thanks again
Lebn
It's somewhat confusing combining two builds into one thread, maybe you should have started two threads.
At any rate, I'll address her bike since I have lot's of experience w/ that type of build.
Motor-700or 800 Watts is about the max. you want to run on her frt. wheel. More than that and it can get squirlly. And aside from wheel spin on less than optimun surfaces, there is the possibility of leaning on the throttle w/ the bike stopped. It used to happen to me before I went w/ a half-twist instead of a thumb and @ 700 Watts, the bike doesn't launch out of one's hands. Also, at this power level, one can safely use the PAS without a brake cut-off. With the Q100, there is very little advantage of running the 201H over the 260H. The 260H pulls about as well as the 201 while having a higher top speed when both are on the same Voltage. And a 260 will hit your target speed of 19 Mph on 36V. By keeping the Volts low, we can run a fairly stout controller, while keeping the overall system power level in our "safe" range.
You are correct in your observation that BMS B. doesn't offer a sine wave in the 17 to 20 Amp range. I use a simple 9-FET 17 Amp square wave from Elifebike that uses the 3-speed 810 led display. I like the simpleness of this set-up and on a bike w/ a limited speed range, the 3-speed limit works well, with speed ranges of around 14 to 15 mph, 16 to 17 mph and 19 mph unlimited. And with the low power of the system, the bike doesn't lurch to speed when using the PAS. Also, you can buy their controller on Ebay for $40 including shipping. The name of their store is diyebikestore.This is good since you will have to buy a battery, you might as well get both the motor and a Lithium Ion battery from BMS Battery, probably the best value batteries out there, especially when one combines the shipping of both the battery and motor.
Battery-Check on her Trek to see if there are water bottle mounting lugs on the under-side of the main down tube. If they are there, use can use a water bottle(or Dolphin or Shark) style battery. If they are not there, consider the new flat-pack battery that rear rack mounts. The frt. motor will counter the battery weight nicely. I have one of the 36V Dolphin batteries w/ genaric cells and it is working well, but D8veh feels the Panasonic cells are worth the extra $$. Go with the best and largest capacity battery that fits the budget.
Don't forget the little stuff, like a spoke wrench, torque arm and throttle. I should say throttles, because it might be a good idea to buy every style til she decides what she likes. I like the left-hand half-twist because most of us remove the left side shifter(shifting chain rings is not needed on an Ebike)and i like the throttle on the left and the shifter on the right. The half-twist seems to be easiest on thr arm muscles, especially when combined w/ PAS.
I rode a bike much like this for a summer where I rode almost exclusively on a boardwalk w/ lot's of people around and I liked it's releaxed slow speed controlability while retaining good hill climbing performance(for a mini-motor).
https://endless-sphere.com/forums/viewtopic.php?f=3&t=68756&p=1036885&hilit=+idrive#p1036885