This Solar Library has thee two solar panels in it, one is blue and the second one is black.Let's place these sensors in the Proteus workspace, as shown in the below figure:.In the above figure, the first result is from version 1.0, and the remaining two are added by this new solar library.In the components section, make a search for solar panel and you will get results as shown in the below figure:.After adding the files in Proteus software, open it and if you are already working on it, then you need to restart it.
If you are unable to add Library in Proteus 7 or 8 Professional, then you should have a look at How to add new Library in Proteus 8.