have built a Solar Monitoring application that is allowing users to see the performance of their solar installations (per panel data!). Never before could you see the true impact the shade of trees, clouds, differences between panels.

Ruby made this possible. We use Ruby throughout the stack (early on we wrote our own web application framework for embedded use). The rapid, pleasurable development experience allowed us to move quickly and change rapidly. We now use Ruby and Rails heavily to extend the platform for more and more customers.

You can see the system in action here: https://enlighten.enphaseenergy.com/systemslist