Great links, thanks. Got another idea too from the second link! Maybe a better one.
I was thinking on something like the first one. Make a frame to hold the bike up, but instead of the rollers I was thinking drive the motor right off the tire. With the exercise bicycle the tire is already raised.
The second link about the large flywheel pulley at the crankshaft/peddles I like also.
I have several junk 10speed or more bikes around here, I may combine both links ideas into 1 bike. If it works well, I can build lots of them if I can find the motors to use.
The second link gave me another idea also. It mentioned using an AC motor for pure sine wave output conected to the grid, and of course it's dead if the grid is dead. Thinking on this quickly, taking a low rpm AC motor and running it faster than the rated speed it will produce power. So a simple thumb switch on the handle bars to turn it on and off and a ratio that spins it fast at normal peddaling speeds should feed directly to the house (not the grid) any power you make. So instead of charging batteries and looking for certain motors to use I may try one of those also.
In other words if I am using 700 watts of grid power running the frig, Tv, lights, ect.. and I ride the bike producing 100watts with the motor for awhile, then durring that time I am only using 600watts of grid power plus the 100 I made myself. That might actually be better than anything else! Also if by any chance I am actually using less than I am making, maybe it would feed the grid, but I dought that would ever happen!
If the grid goes down so does the genie power, so no islanding could happen either.
Now I wonder how that would work with an inverter? I have no idea if this is correct, but I THINK as long as you make less power than your using it would be safe and not fry the inverter. But I would test with a cheapy inveter before trying it with an expensive one. It seems to me that if I were powering a 700watt AC load off the inverter, then ran the bike gennie it would sink to the mod wave of the inverter like it does the sinewave of the grid, not sure though. If so then the house still should see 700watts of power available, but the inverter should only see a 600watt load.
If the motor tries to put out a pure sinewave when ran off the mod wave inverter though I don't know what would happen, could fry something I geuss??
If I get time to build one and have a decent AC motor to test with I will try it myself. Worse that could happen is I fry the motor or inverter, so I'll use cheapies.
My thought is maybe ride while washing clothes, less load on inverter and saves the battery power, but if you get tired and stop riding the clothes still get washed. Or if you get a phone call etc.., for that reason I would not want direct drive from the bike for much as a power takeoff like one of the links mentioned.
As a side note about experimenting with things, a 300watt inverter will run a smart charger at at least 15amps 
Did some testing on that the other day. Never could decide what the losses were or how high amps I could charge at that way, even on grid power none of my batts would charge more than 15amps max with an up to 40amp smart charger.
