Interesting question. I have never tried Solar chargers, but I know that battery extenders can be useful as well and might be more reliable (in the case the weather sucks
). Extenders are relatively cheap and look like this:
http://store.yahoo.com/semsons-inc/batexwitusb.html
http://store.yahoo.com/semsons-inc/pocpowban.html
http://store.yahoo.com/semsons-inc/pdabatexpocp.html
I am not sure which one would fit with the EB1150, you should compare the specifications of your device with those of the extenders.