wesnewell said:
I use 14s of Zippy 5ah 15C. No problem pulling 30A. I don't know much about the Cyclone kits, but if they are as efficient as a hub motor you could get by with a 14s 8ah pack of 30C Zippy's. Really depends on a lot of factors. One good thing about lipo is you can just parallel more on easily. Most times I just use the sla charger to charge mine, but needs to be manually disconnected when charge is reached. One of these days I'll either by a timer switch for it or get a bulk charger at the specified voltage For $29.. Other times I use regular lipo charger that shuts off by itself. I rarely ever use the balance leads.Idontwanttopedal said:
While they're rated for 10C continuous, their 2000 cycle life is rated at 80% DOD 1C, 1500 @ 100% DOD 1C. Check the detailed description. How long will they last at 2C, 3C, 4C discharge rate? And they aren't cheap. A 16ah pack will cost over $500. May be worth it. I don't know. More than I'd spend though.Idontwanttopedal said:
wesnewell said:I've got a 48V 500W kit and the controller maxes out at 31A, so 25A sounds low. /quote]
Then it's really more like a 1500W kit, as that's what 48V at 31A would give you.Not saying the motor or batteries are is capable of that, continously, but if you were using that setup under conditions that constantly drew 31A, and your pack could keep up at least 48V, you'd be pulling 1500W thru that motor.
I would expect (though vendors may disagree) that a controller included with a certain wattage kit would have a current limit that does not allow the motor to exceed it's rated wattage, and/or would not let the included battery pack (if any) exceed it's own current limit (assuming it's BMS (if any) doesn't do that limiting).
My own "500W" motor on CrazyBike2 certainly draws far more than that with the 48V (52-54V typical) Vpower pack and a 12FET controller with an apparent current limit of around 60A.
For 16 mile range, you don't need 20ah. I get about 10 miles without pedaling out of my 5ah 14s lipo pack that cost $114, and up to 40 miles if I pedal and keep the speed down. You only need 20ah if you go with a pack with a 2C max rating, and to be honest, you should probably go with a 30ah of that type to keep the draw down to 1C. I still think, from what I've read, you'll find that the controller will draw a lot more than 30A unless you limit it yourself.Idontwanttopedal said:
If my research is right (see previous post) your controller could draw 50A. If it does, it'll burn a 15ah ping up pretty quick. My advice is to get a pack that can handle at least 50A and be safe. Cheapest, smallest, and lightest would be lipo, but if you want lifepo4, I'd go with a 10ah A123 pack from cellman. If you can verify you'll never go over 30A, then, and only then would I get a 15ah 2Cc max, 1c recommended ping type pack.Idontwanttopedal said:
