In this forum there is a lot of information about solarpanels and everything about plugwise. Take a look to that all, because you will see a lot of possibilities.
1. You need at least 1 circle and 1 Plugwise stick with the software. Look at the Plugwise site.
2. It is easy to install on your pc and you can see every hour how much power the panels deliver.
3. The data will be there for more than a year into the circle. So you don't have to run your pc for 24 hours.