Liam S.
9/23/2025
We recently completed a solar + battery installation with A1 Sun and are very happy, both with the process and the result. They were able to jump in on short notice and install footings as our...
A1 Sun
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1455 4th St
Berkeley, CA 94710
A1 Sun is a family-owned residential solar and energy storage design and installation company based in Berkeley, CA. Since 2007, they have been helping Bay Area homeowners incorporate solar and battery systems into their homes to meet their current and future energy needs.
With a focus on quality and durability, A1 Sun offers advanced system design, blackout readiness, and decades of performance. Their expert team takes the time to understand each home's existing wiring and usage patterns, customizing energy storage systems to maximize energy bill savings while maintaining blackout readiness. A1 Sun also provides data monitoring, allowing homeowners to view real-time and historical solar production data from any device.
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Reviews
5.053 reviews
Aidan K.
10/22/2025
Professional and high quality service. Couldn't be happier with the install and setup.
Robert O.
10/30/2025
They communicated with us clearly and frequently during the entire process. They began with a detailed analysis of our needs, and calculations of the solar potential of various parts of our roof....
David B.
6/2/2025
I have recently completed installation of solar panels with battery backup by A1 Sun. They have been extremely responsive and professional at all points along the journey, and I could not be more...
Shin K.
8/15/2025
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...
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