Suntrailer, panels down.
Creating a sun-powered vehicle interests amateur engineers the world over. Since the bike as such is unsurpassed in simpe energyefficiency, it's a good starting point. After testing a trailer with one solar panel and two wheels, my second iteration is a one-wheeler with two panels, and that was about twice as promising, even when testing it in Finland, far up North, in late August and September 2025. It produced a useful amount of power on a sunny day, about 500 Wh a day, which corresponds to one full charge for the e-bike battery, corresponding to about 100 km of e-assist with the trailer and the camping equipment on board. The panels are connected in parallel (trial and error-wise). During stops, the right-handside panel can be raised up towards the sun, see here: www.flickr.com/photos/40824784@N05/55625490396/in/photost...
Suntrailer, panels down.
Creating a sun-powered vehicle interests amateur engineers the world over. Since the bike as such is unsurpassed in simpe energyefficiency, it's a good starting point. After testing a trailer with one solar panel and two wheels, my second iteration is a one-wheeler with two panels, and that was about twice as promising, even when testing it in Finland, far up North, in late August and September 2025. It produced a useful amount of power on a sunny day, about 500 Wh a day, which corresponds to one full charge for the e-bike battery, corresponding to about 100 km of e-assist with the trailer and the camping equipment on board. The panels are connected in parallel (trial and error-wise). During stops, the right-handside panel can be raised up towards the sun, see here: www.flickr.com/photos/40824784@N05/55625490396/in/photost...