I just got a wattmeter for my China hub motor kit, rated 500w at 36v. Let me tell you, I did NOT expect the results. Going on flat ground that thing pulled 1200w straight from the jump! 30v (that’s a 10 volt drop) and 39 amps! Meanwhile, my battery is a hover board pack rated for 20 amp maximum and I was like what the hell: it can handle 13 amps at 36v. I’m just so lucky my battery didn’t explode! I paid for the cheapest 500w kit and China sends me more than double that, these are the miracles of Chinese economics.