Exercise bike generator

[Faringdon]

Hi,
For exercise bike, do you know the cheapest way to get it done?

Say a BLDC...and connect pedal shaft to rotor.....then make stator field lead rotor field...ie, make the user pedal the south pole to the south pole, so they feel the repulsion force as they go round....more current...more force (more uphill?)

Or is it cheaper to just pedal into battery (with BLDC in regen)  and have inverter from battery  regen'ing back into mains. kind of green anergy aswell?

[NiHaoMike]

Cheapest is a MPPT controller direct to portable electronics, nowadays that would be using USB-C. Unlike a grid tie inverter, it will work without the grid which would be a great selling point - doubles as a backup power source!

For my senior design project, I built an exercise bicycle with a grid tie inverter, but the grid tie inverter is really mostly to add something that's not trivial to implement.

[fourtytwo42]

If I could get her indoors on the exercise bike in the first place that would be a winner even without tapping off any energy