We are coming up on our 4th year of having solar panels from Diablo Solar Services. They did a great job in putting on our solar panels. They installed micro inverters, and I am even able to see how the things are working, from my computer. Since we live 60 miles away from their nearest office, we don't get normal maintenance and servicing, but we did have an issue once when wasps made a nest, which stopped our panels from working. Once we found the issue, they came right over and took care of the problem. They've worked out well.