Well, it doesn't say "250 watts" It says, "250W". That could be a model number. :^)rowbiker wrote: ↑Mar 30 2019 7:44amThis is all super-ingenious, and I think easily qualifies as 'out-of-the-box' engineering. I just watched Justin's presentation (video) about ebike motors at the Vancouver bike fair, in which he mentioned mfgr's claims about their motors' rated wattage. I wonder what he'll make of your brazen "250" label! I'll be curious to hear about your experiences with this approach.
BTW, I'm done some pretty decent etching of stainless steel using nail polish masking, vinegar and salt solution and a 12 volt power supply. Not sure if that would work with aluminum though.
The ambiguity of the 250W label has me thinking ... how nifty if a manufacturer like Grin would give their motors model numbers that gave the impression of being for super low wattage while supplying the motor with a removable label with all of the official stuff. For instance, Model No. G250W.HB might imply a 250 watt hub motor but it is actually just a (semi) arbitrary model number. You wouldn't want to do this if you were assembling complete bikes, but as an independent motor supplier?
Speaking of removable labels, this is the one I made for my motor. ( Laser printer, packing tape for outside lamination, and double sticky tape or contact cement to adhere). I can argue this wattage if need be, but the idea is to have something simple that is visible in the unlikely chance that I ever get questioned. So far the local constabulary has shown zero interest in my motor wattage. I think that's the natural result from not going much faster than 25 mph on flat level ground.