This is a neat idea, but there is no way you can get the power stable enough to do this. The best way to do this is to get a car battery and a DC motor and backfeed the motor into the battery, then power either 12v appliances off of it, or get an inverter and use that. The cost to purchase all of this junk will sadly likely never be paid off by your pedaling efforts. You might do 100 watts for an hour. If you did that everyday you might make 5 dollars worth of electricity in a year. I have thought about it myself
-Pedaled 9446 miles last year.