Found on instructables.com: Solar Powered Trike

This solar-powered trike design by dpearce1 looks like a relatively simple project, and cheaper than just about any other solar-powered vehicle project I’ve seen.


Solar Powered Trike - More DIY How To Projects

This project should be buildable with the following items, plus a hub motor and throttle controller (dpearce1 used one from goldenmotors.com), some high-pressure bicycle tubes, and a 36 volt charge controller (if I locate one, I’ll link to it), for around $900-$1000.