A1 Sun is a true local gem, committed not only to providing excellent project management and customer service, but also to hiring, fairly compensating, and retaining a skilled and dedicated staff in Berkeley. The Giustino family's lifelong passion for solar, including an enthusiasm for education as well as installation, has clearly infused the ongoing enterprise with a cohesive sense of collaboration and commitment. I had a VERY complex design and installation project, requiring careful and con

We had a very positive experience with A1 Sun for installation of solar with Enphase battery backup. We replaced the roof at the same time, and I initially contacted larger installers who would quote for the roof plus solar. I'm glad we also contacted A1 Sun and local roofers (choosing to work with Nicholas Roofing). A1 pricing was comparable to other quotes, and importantly was never inflated for other issues as they arise. They worked out a layout on our south-facing rooflines to maximize

Professional and high quality service. Couldn't be happier with the install and setup.

I wish I could give more than five stars. A1 Sun and crew went above and beyond to bring my solar power project over the finish line. I contracted with a terrible solar company first who went bankrupt after stealing money from clients for unfinished and ill baked projects including mine. Despite the complexity of my half baked solar project, they didn't decline my request for help. They demonstrated awesome creativity to make use of the footings installed by my previous contractor. They painstak

I just got off the phone with "Ferrar", Service Manager, about an Enphase warranty repair. A1 Sun , the Enphase Platinum contracted installer in Berkeley, will not effectuate Enphase labor/product warranty repairs per what Enphase contracts. Their estimated surcharge for an estimate to determine what repairs are needed is a minimum of $550 plus $200 per hour after two hours. In my case where the system electrical defects are known, to replace out an IQ Controller 3, the time to do this will be

I have recently completed the installation Process of solar panels with battery back up. I chose to use A1 Sun after reviewing several local contractors. I have been extremely pleased with the process and with the interactions I’ve had with this company along the course of the installation. I give them my highest recommendations. To take just one example, many of the installation companies, I initially contacted had me speaking to what was clearly a sales person who made proposals based on a Goo

We wanted a solar electric system that was future-ready, with enough power to start making our home fossil-fuel-free, and A1 Sun delivered. They were very informative in the assessment/proposal phase, and mindful of details in the installation phase. Their rates were competitive. We were also installing a new roof and they seamlessly coordinated with the roofing company. Their designer was able to work around some challenging roof geometry to give us the system size we wanted, and it is produci

I had an excellent experience with A1 Sun installing a full solar system for my home, including panels and a battery using Enphase equipment. They came highly recommended by a neighbor who had a great experience, and they lived up to the praise. From the start, the consultation process was very informative. As a local, small business, A1 Sun provided a personalized touch, conducting a site visit, offering clear explanations, and giving thoughtful advice on designing the best system for my needs