Different slant on the charge issue.....can you charge while riding? Any portable Li battery pack will work. I run a dual usb socket on my accessory socket and charge both my phone and a 3500mA battery pack. I then run the battery pack in the tent for radio, phone, speaker.
Reviews on their website look fake. Hard to imagine 30,000Ah at that price too and even if it is half or a quarter of that capacity it will be hard to charge with such a small solar panel. Looks like an overhyped bogus product to me. Stay away.
Goal Zero http://www.goalzero.com/solar-kits
I have the Guide 10 kit and use it - either the solar panel directly or the battery pack - to recharge helmet intercoms, phones. The battery pack runs a "reading" lamp at night.
Sorry about the late reply! I have not used it yet. I set it out in the sun to charge. It can also charge by plugging it in to an outlet. I need to use to to charge something else. But it did charge.