Inspired by older thread on Extending Range I have been gathering components for a similar project but haven't advanced much farther than that. I am using a Lifan 139F 2 engine for power, a 24 volt 250 watt brush scooter motor for generator, and a 24 volt to 12 volt DC Golf cart converter for charging the 48 volt 1400 mah Litthium ion battery for my 1000 watt hub motor. The setup that I am currently testing is relatively simple. using standard components and my wall charger. I am curious to learn more about David's auto throttle design, because I wouldn't have a clue how to proceed with that, so I have settled on this simple approach for now. I am planning on mounting the components on a Phatmoto Rover bike that I have recently purchased.