This plan involves the solar cells being part of the laptop, not some optional extra PSU. The plan is:

1) Rebuild battery for my PowerBook Duo with 2100mAh cells instead of the original (dead) 1600mAh ones for 6 to 8 hours of battery life.

2)Acquire solar cells, attach in some fashion to top of laptop and external PSU connector on the back of the laptop.

3)Roam far and wide with truly portable laptop, free from the grid.

Any ideas for the solar cells? It needs about ~7W maximum power and is about 250mmx300mm.