!0kw pumped through XM3500li
Running the xm3500li on 28 40H cells and using a kelly KBL12251 (you really only need a 12151) my cycle analyst shows up to 10.5kw drawn from the motor and about 148 max amps. Why this isn't tripping my breaker is a mystery to me. Also it seems like at this higher voltage my wh/mi are lower at a given speed. So far everything is running cool and smooth. City driving 20/30mph I'm getting 14.5% range back from regen and as low as 28wh/mi.
Mixed driving 30/50mph gets about 7% regen and 48wh/mi. Long 45mph and over trips 2.2%regen and 68wh/mi. This translates VERY loosely into about 65,50 and 40 mile range at those prospective speeds. I have the kelly controller set at 80% motor power and 50% battery power.
Yes, those spikes are brief I think you nailed it. It feels reeeeealy peppy though. Terrain makes such a difference that it's hard to peg the figures. Full throttle on level terrain seems to level at about 3.5kw that was 24 cells. I haven't done much testing with 28, at least I haven't done any serious testing. Cruising at 45mph on hilly terrain it will go from 6kw uphill to maybe 0kw down depending on grade.
BTW Thanks again for the tip about the CA!
Trading brake dust for amp hours is great! Regen is a must!
Do you think the 100v max shunt cycle analyst can take 106v? I'm at 93v but I would like to try 106v.
Do you think the 100v max shunt cycle analyst can take 106v? I'm at 93v but I would like to try 106v.
You need to change your name to "addicted to volts" ;-)
Unfortunately I don't know the answer to your shunt question.
It's only because you're only offering up to 96v...muahahaha! I have to be the most POWERFULL!!!
Aha, the evil scientist, eh? World domination to follow soon? I like it!!
Just so we can compare apples to apples (or electrons to electrons) - you seem to be using 3.3V as the nominal voltage of a LiFePO4 cell. I believe it should be 3.2V.
28 * 3.2 = 89.6V <-- your current beast
30 * 3.2 = 96V <-- the C130
32 * 3.2 = 102.4 <-- your next evil creation?
Good luck - let us know when you let the magic smoke out! When you do let me know and I can sell you replacement parts ;-)
You're right I actually arrived at that by adding the 12.8 nominal of 4 more cells to the 93.2v that I see on the cycle analyst at rest. Just did a trip where I got 42miles out of 19.28AH the average speed 21.8mph top speed 53mph 40wh/mi. I'm really having fun with this bike. Your scooters sound real nice. If they were available when I was looking I would have done well to get one. I don't think I'll get any smoke as long as I don't push it to hard on a hot day...I hope. I have a 4.5kw motor ready to go anyway...the maddness continues!
i have a possible explanation for the improvement in wh/km
While at the emax factory, the head technician pointed out most trapezoidal controllers (kellys included) dont stop supplying power after the peak of the motor back-emf exceeds the voltage of the trapezoid the controller is producing.
Previously i thought the controllers just stopped when the peak motor voltage reached the trapaziod voltage, to prevent this from happening:
Where the peak voltage of the motor exceeds the trapezoid voltage, the motor is spending part of the cycle in regen, and part driving.
The driving component exceeds the regen component, so the net average torque is still positive.
However, because there is far more current (RMS) on the motor side, the resistive losses are much greater.
Therefore, if your increased pack voltage means the trapazoid voltage the controller can produce now exceeds the motor back-emf voltage across the entire cycle, for the speeds you speed alot of time at, your wh/km figure will improve.
Matt
And I thought Steven just sent me a magic controller. Thanks for the explanation as I do seem to be getting considerably higher efficiency. I'm still trying to wrap my head around what you said but I assumed it was due at least partly to reduced resistance at the higher voltage. I think I will just leave well enough alone for now. I would like to do a controlled run with 24cells 28cells and 32cells though and see how the wh/mi are effected.
Agreed. I don't think increase from 93v to 106v will be a significant improvement on performance. But I do know it risk more the controller and converter.
I don't suggest that.
the controller he is using is rated to 120v nominal, or 150v max.
There shouldnt be any risk in running a 120v nominal controller at 106v.
Matt
Right, what I'm talkng about is the shunt resistor that I got with my cycle analyst, it's rated for 100v and 600amps I believe.
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This is probably only for a short time off the line, eh? What's the current while cruising? What's the max current you see during cruising?
Mebbe the circuit breaker is slow-blow enough to allow for short bursts of high amps?
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