Yes but with regenerative breaking, the additional wind resistance is probably a bigger problem above 35 mph. One trick is to swap out the old 12V lead-acid ba

Yes but with regenerative breaking, the additional wind resistance is probably a bigger problem above 35 mph. One trick is to swap out the old 12V lead-acid battery they insist on sticking in electric cars with modern LiFePO4 ones to immediately save 20-25 pounds. Aluminum or alloy wheels might save another 50+ pounds if the car doesn't already have them. So it's conceivable to carry one or two 50 pound solar panels for free. An inverter and additional batteries to buffer the charge will add some weight though, since most electric cars have the artificial limitation that they can't charge while driving.