Diablo Solar Services did a complete and comprehensive installation of several large solar panels on the roof of our home. When we wanted to expand and add more panels they came right out and accommodated our needs. The system was meant to cover all of our electrical needs. While they were adding the additional panels they noticed a leak that had been caused by one of their panels. They took full responsibility of the issue and quickly fixed it. The panels need to be cleaned periodically to be completely effective, which would usually be taken care of by any rain we would have. Because of the lack of rain they haven't been as effective as anticipated, but the installation has still been absolutely worth it. We have been very happy with the workmanship and responsiveness of this company. We are extremely satisfied with both Diablo Solar's product and service. We would highly recommend them to anyone interested in converting to solar power.