Does anyone have any comments on using solar power to charge Canon NiMH batteries? I'm wondering (in the interests of economy of both cash and mass) whether it's possible to modify the NC-E2 charger so that I can connect portable solar panels (or any other low-voltage source) to its existing charging circuit. My NC-E2 uses about 30W mains power while charging, so I guess it should run from 15-20W low-voltage input, which is manageable.