Parts came!!! Yay!!!
I ended up ordering the Q128C (328rpm @ 36V). (I had wanted the Bafang CST because it seemed like the "safer bet" but I couldn't source it in the voltage/rpm to match what I needed.)
I've got the bike upside down and the motor sitting in the drops so that I can test it out before building up the wheel. Here's what I'm finding:
1) The inline power meter that I bought (https://www.ebay.com/itm/191907345162) shows a significantly different power consumption that the LCD6 controller (33W vs 23W, respectively). Since the inline power meter is in agreement with my multimeter, I'm assuming that the current measurement on the LCD6 is less than stellar. Anyone else find this?
2) The two motors have different current draws at no load, WOT. According to my power meter, one motor consumes ~33W, the other a full 50W. Does this mean that something's wrong with one of the motors?
3) I measured 10.79 revs/volt.
--Measured at two points: 380rpm @ 35.2V & 424rpm @ 39.3V.
--I had to set the wheel size to something really small, otherwise I was running up against the "45 mph" max speed limit.
--This is rather different from the 328rpm/36V listed, but it's totally workable. Is this consistent with what others have found on the Q128C?
4) How is the controller measuring speed?!? Anything voltage that I can it above the 30V cutoff when running with a 700C wheel shows 45 mph at WOT, no load. My motor sim shows about 30mph at 380rpm, not 45mph. Is this a motor pole parameter or something?
But, yay, parts, the motors run, etc.
I ended up ordering the Q128C (328rpm @ 36V). (I had wanted the Bafang CST because it seemed like the "safer bet" but I couldn't source it in the voltage/rpm to match what I needed.)
I've got the bike upside down and the motor sitting in the drops so that I can test it out before building up the wheel. Here's what I'm finding:
1) The inline power meter that I bought (https://www.ebay.com/itm/191907345162) shows a significantly different power consumption that the LCD6 controller (33W vs 23W, respectively). Since the inline power meter is in agreement with my multimeter, I'm assuming that the current measurement on the LCD6 is less than stellar. Anyone else find this?
2) The two motors have different current draws at no load, WOT. According to my power meter, one motor consumes ~33W, the other a full 50W. Does this mean that something's wrong with one of the motors?
3) I measured 10.79 revs/volt.
--Measured at two points: 380rpm @ 35.2V & 424rpm @ 39.3V.
--I had to set the wheel size to something really small, otherwise I was running up against the "45 mph" max speed limit.
--This is rather different from the 328rpm/36V listed, but it's totally workable. Is this consistent with what others have found on the Q128C?
4) How is the controller measuring speed?!? Anything voltage that I can it above the 30V cutoff when running with a 700C wheel shows 45 mph at WOT, no load. My motor sim shows about 30mph at 380rpm, not 45mph. Is this a motor pole parameter or something?
But, yay, parts, the motors run, etc.