Then of course time to purchase a (100 amp?) load tester
Got one of these myself: http://www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=91129 works great for the price. I don't think that an Etek at 48 volts will give you enough power. I have
heard that they melt down if you try to use them at much over 300 amps.
Time appears to be very important. From the etek manual: http://www.electricvehiclesusa.com/schematics/etekmanual.pdf the etek can take 330 amps for 1 minute, but whats not mentioned is how long the motor would need to cool down afterwords, and at what temperature the test was started at, presumable room temperature. I've heard that you can pull lots of amps safely when they are cool, but the temperature will gradually rise. Like going for a run with sweats on in summer, you'll probably be fine for a few minutes, but after that you'll need to slow down or you'll pass out. The etek continuous rating is actually around 100 amps, if you figure 6 hp output at 48v. This is most likely without outside air flow. Might be better off with a Perm motor? Not likely at the same voltage (48v). The perm motor has a similar continuous current rating (110 amps as listed here: http://www.electricvehiclesusa.com/product_p/mo-pmg-132.htm). An ADC motor has a similar continuous current rating, but has much more thermal inertia. It can take alot more current than an etek for 1/2-hour for example. To get more power at 48v you could use 2 Perm/eteks, or consider a transmission/CVT of some type. I think for your target speed, an etek at 48v should work fine, especially on a light 250 bike.
