I wasn't looking to have solar panels mounted on my bike during a ride... and as I live in myrtle beach there is no lack of sunshine, so it would be an alternative to plugging it in and paying for electricity to charge it. I have a small solar panel trickle charger for my car that sits on the dash and plugs into the lighter, so wasn't sure with todays ever evolving tech that maybe someone had come up with an all in one unit to charge variable voltages. thanks to all for responding.