A1 Sun
A1 Sun is a family owned, Berkeley based residential solar and energy storage design and installation company.
Since 2007 we have been helping Bay Area homeowners incorporate solar and battery systems into their homes to meet their current and future energy needs.
Energy System Design & Build for High-Performing Homes
Store during the day
Powered at night
Advanced System Design: We get into the details of how you plan to use electricity – both now and in the future – to size a solar system that provides the best value for the long run.
Blackout Readiness: Our advanced system controller will sense an outage and shift to off-grid mode within microseconds. In most cases, you won't even see the lights flicker!
Decades of Performance: Most solar panels are under warranty for 25 years or more – but will the installation be as durable as the hardware? Our focus is quality. We will evaluate your roof, and develop an installation plan to stand the test of time.
Home Integration: A1 Sun experts take the time to understand your home’s existing wiring and usage patterns. We customize all the parameters of your energy storage system to maximize your energy bill savings while maintaining blackout readiness.
Data Monitoring: You will be able to view both real-time and historical solar production data, anytime, from any device. If interested, we can also add additional equipment to monitor your whole home's electrical consumption.
Location & Aesthetics: We will work with you to find the best location for the battery system, whether inside or outside. Your custom installation will meet code, your personal aesthetic, and practical requirements.
What We Do
We Value Quality Above All Else
Solar is a long-lasting investment. Installation quality matters. We don’t pressure our crews with hyper production quotas. We safely take the time to get every detail right.
Locations We Service
A1 Sun is located in Berkeley. We serve the surrounding counties of Alameda, Contra Costa, Marin and beyond.
Berkeley, CA
Novato, CA
El Cerrito, CA
Oakland, CA
What Our Clients Say
The team at A1 Sun were excellent!
From the initial meeting, through design, installation, and connection with PG&E, the team at A1 [Sun] were excellent. The sales team were attentive to our needs, and extremely knowledgeable as to how to accommodate them; the design and installation were very smooth; and the team that spent time at our house were uniformly pleasant, thorough, and competent. Highly recommended.
A1 had our back and stood by their products and installation and got us fully operational promptly
I have a lot of experience with this company dating back over a decade: they put in my uncle's solar system, my mom's system, and my mom's best friend's system. Then they upgraded my mom's system and we got our own system put in at our house in 2009. All of those experiences were excellent. We then had them out to upgrade our panels in late 2019 and install a complex batter backup system. Late last year there was a PG&E power surge that wiped out the battery backup system's motherboard. A1 replaced it promptly and at no charge. While onsite to do that warranty service, they noticed 6 of our panels had heat damage on their undersides. They worked with the panel vendor, LG, to secure replacement panels and swapped those in for the bad panels, again at no cost to us. I really appreciated how A1 had our back and stood by their products and installation and got us fully operational promptly.
These guys know what they are doing and they are doing it well!
My roof was leaking and could only be fixed if my solar panels (installed 15 years ago by a company that does no longer exist) would be removed. I called A1 on the recommendation of a friend and man, that was it. Larry Giustino came to my house and gave me an absolutely reasonable bid for removing and re-installing the panels.
These guys were punctual, quick, knowledgeable, clean, and friendly. After my roofer had done his job, they came back to re-installed everything. The system is working beautifully.
It was a small job, but I can tell that these guys know what they are doing and they are doing it well. I highly recommend A1 Sun and should I ever want to extend my system, or do anything else solar, A1 is the company I’ll call again.
A1 had our back and stood by their products and installation and got us fully operational promptly
I have a lot of experience with this company dating back over a decade: they put in my uncle's solar system, my mom's system, and my mom's best friend's system. Then they upgraded my mom's system and we got our own system put in at our house in 2009. All of those experiences were excellent. We then had them out to upgrade our panels in late 2019 and install a complex batter backup system. Late last year there was a PG&E power surge that wiped out the battery backup system's motherboard. A1 replaced it promptly and at no charge. While onsite to do that warranty service, they noticed 6 of our panels had heat damage on their undersides. They worked with the panel vendor, LG, to secure replacement panels and swapped those in for the bad panels, again at no cost to us. I really appreciated how A1 had our back and stood by their products and installation and got us fully operational promptly.
The team at A1 Sun were excellent!
From the initial meeting, through design, installation, and connection with PG&E, the team at A1 [Sun] were excellent. The sales team were attentive to our needs, and extremely knowledgeable as to how to accommodate them; the design and installation were very smooth; and the team that spent time at our house were uniformly pleasant, thorough, and competent. Highly recommended.
If I could rate A1 Sun more than 5 stars, I would!
We had been contemplating solar for several years but I had been overwhelmed by the information out there. Do you lease or buy? Types of solar panels? Which company provides the best service? Finally, I found numerous recommendations for A1 Sun through Next-door. I am so thankful for these recommendations.
From the estimate to the completion of the project, Joel and his team made the process so easy for me. They kept me updated on the progress of the project such as the design based on our electricity usage, the timeline for the installation, and every step in between. Furthermore, their team handled all of the paperwork, including the permit and final inspection from the City of El Cerrito. Anthony helped me so much with getting the PG&E rebate for the backup battery. I appreciate all of the people who helped to make this project as painless for me as possible. If I could rate them more than 5 stars, I would!
Our Commitments
Treat every home like our own.
Quality over quantity.
Every job handled in-house, by a well-trained team.
Be a good neighbor.
Build to last forever.
Are you embarking on a home remodel, or other major project in conjunction with renewables? Learn about how we work with other trades