Posting this to share a little of what I have learned. Understandably, there are no more solar shields left from the kickstarter. So, have been trying to decide on a solution based on solar chargers for my little project. I researched the panel being sold at Adafruit, and that led me to Voltaic.
Check this out… two of their battery packs have a ‘always on’ mode, so you do not have to worry about the sleep/snooze on the dash making a ‘power pack’ shut off:
I am ordering this one: http://www.voltaicsystems.com/3-5-watt-kit
Should be plenty for my Dash at the frequency I will collect and upload data. Will report back.