You eat 18kg of veg?I admit, it was a but tricky after stopping at traffic lights when my bike leant over with 18kg of veg .....
My God. you are backing the wrong technology for bicycle propulsion. What you need is some sort of rubber tube leading from your own 'person' to a small gas turbine engine. If you are committed to electric traction, just have an alternator connected to the turbine shaft and carry on with your bafang.
You could rebadge it as Fartang.....