how do you make solar panels to small and whats the little green bit for

Question: how do you make solar panels to small and whats the little green bit for
- Keywords:
  size,
  solar panel
Asked by 54321pink54321 to Ed on 14 Mar 2013.
- Edward Bovill answered on 14 Mar 2013:
  
  The solar panels I make are that small because it means I can make lots of them in one day (between 20 and 30 is the normal number per day). I make them all slightly differently to see how it affects how good they are at converting sunlight into electricity.
  The little green bit you can see in the picture is just a number drawn on with permanent marker – that one is number 17 from that day’s 20 devices.

Question: how do you make solar panels to small and whats the little green bit for