I did run the math for our last extended bike tour and even that doesn’t really work out. We carried two pairs of 650Wh batteries for our cargo bikes and made a

I did run the math for our last extended bike tour and even that doesn’t really work out. We carried two pairs of 650Wh batteries for our cargo bikes and made around 60-90km per day. This used on average half a battery charge, so ~600Wh. Foldable panels of reasonable size and weight top out at 300W. So best case, ideal conditions, no charging loss you’d need 2 hours to top off each bike. Add non-ideal conditions and charging losses and you’re easily looking at 6-8 hours, a significant chunk of your day. And you’ll likely need to carry an inverter, since DC chargers for e-bike batteries don’t seem to be a thing. We ended up carrying an extension cord. Things may work out if you plan on having a stationary camp somewhere remote.