Just came accross this Solar Powered USB hub that allows you to charge off of it, check it out:
Here are the features:
- As a charger to your mobilephones (see note below)
- It is a Hybrid Charger (rechargeable by Solar panel and USB Port)
- It is 4-port USB 2.0 Hub (backward compliant to USB 1.1, USB 1.0)
- The solar panel can charge this device even under weak light (e.g. indoor with daylight)
- Connects up to maximum 4 devices in the same time (depending on loading)
- LED Power Indicator
- Supports HDD upto 500G
Its not even that pricey, you can pick one up on
USBfever for just $21.99!