- Nov 8, 2003
benkoostra said:can anyone tell why this wouldn't work and be just as effective at measuring my wattage output as the powertap, or walletdrain, or whatever it's called?
Well, it would sort of work but not quite how you think. Adding a generator to your trainer setup would be like adding another resistance unit with a linear increase in resistance (not considering start up current in the lightbulb) as speed increases.
So, let's say you've got the lightbulb up to it's regular brightness so you've got 100w pumping through there. This means that you're making much more than 100w due to the inefficiencies of all of the equipment as an earlier poster mentioned. You'd have to use some other means to calibrate how much power you're making when the lightbulb is at 100w.
Finally, this would only work on a trainer because the generator is simply a "flat tax" on your power related only by wheelspeed. e.g. it wouldn't see the extra power you're making to get up a hill at 8mph, it would only see the power needed to go 8mph under any circumstances.