Theoretically you could, but it would take a lot of time as you would need to charge the battery with enough energy to output a killowatt. Basically, you'll need to be on the bike for about 15-30 minutes to charge up the battery.

Edit: Sorry, I miscalculated. I forgot about the amount of time that the power would need to be supplied for.

I'd estimate the turnover time period to be roughly 2-3 seconds, so you'd have to be on the bike for 2-3 times what I said.