spinningmagnets said:
From another perspective, I am shocked...SHOCKED I SAY!...to find out that a vendor on the internet has over-inflated the power, range, and efficiency performance specs of their products. Thanks for informing us.
I know this was said with some sarcasm/humor, being quite true of many vendors. But to the defense of the industry, one of the things that has really surprised me is how honestly and accurately most actual ebike motor
manufacturers (not just ali-express resellers) are on the specifications of their hub motors, both in terms of peak efficiency and nominal power capability. Most geared motor manufacturers specify around 80%-82% peak efficiency, which is exactly what I measure on the dyno, and direct-drive motors are typically advertised as 84-86% efficiency, which is again pretty much exactly what an independant dyno test what will show.
And a surprising number of manufacturers include a printout of the actual dyno test curves of their hub motors, and I've never seen one of these that looked suspicious or didn't jive with my own measurements. And for power ratings, where they'll usually list smaller geared hub motor as say 250 watts, while by RC hobby standards that exact same motor would be called 2000 watts.
You can have beefs about a lot of things, but the overseas motor
manufacturers have been pretty straight up honest about performance expectations.
We don't know the motivations of the OP, but it's a valid question or observation with a straightforward answer. On a hill climb, you've got more than just gravity to overcome, so add rolling and wind drag and you might need more like 200 watts to climb that hill at 6mph. And at just 6mph putting out substantial torque, most direct drive motors will be running at less than 50% efficiency, as any torque/speed curve (or the
motor simulator) will show you, hence needing 400-500 watts from the battery. You'd have much better motor efficiency using 1000 watts and climbing that hill at 20mph instead of 6mph, and would consume fewer Ah to get to the top too.