Originally Posted by
noglider
Hmm, I'm trying to imagine what it would feel like for my dynamo hub to draw that much kinetic energy from me. Anyone know how to describe what it might feel like? Maybe like taking 10 psi out of my tires? I love dynamo hubs, but I use them mostly to power a headlight. If I wanted more energy, I might prefer to carry a 1- or 2-pound battery. They can carry plenty of energy between stops at an outlet, depending on what I want to power.
Compare the charging output to the same drain rate on a e-bike battery; The torque/thrust from the e-bike equals the drag of the generator. If you have the ability to charge the same size battery as the e-bike, in the same time it takes to deplete the e-bike, you're probably talking a lot of drag.
Were this not the case, I would plan on charging my CPAP battery on the bike. But no.