By the way-how many amps does a MP pull out of the batts?
So what about the current rating of the controller ? GM never announced what it was, but I can reveal after testing under a few different conditions with hard starts and up steep hills that the max current is about 28 amps. For the most part it's hard to get it to draw more than about 22 amps and if I had to put a rating on on it I'd say 25a.
Actual running voltage with the 15S pack was about 58v. Peak power draw on 60V (58V) was 1600w.
As Watts/Volts = Amps then 1600/58 = 27.586Amps, which seems about right to me.
Just out of curiosity, I did a simple stall test on my Magic Pie while it was mounted in a vice on the bench to see what the torque was like. I used a luggage weighing scale hooked into the valve hole and measured approximately 15Kg pull at the rim on 24V and 17.5Kg pull on 48V.
(An effective radius of approx. 285mm.)According to my calculations that's a torque of 42Nm@24V and 49Nm@48V, which seems very good.
On 48Volts that should give about 15Kg
(147N) of force at the tyre, which should be enough to pull away on a 10% slope without pedalling.
(Assuming me, bike and batteries etc. will be approx. 100Kg.)Alan
