A1 Sun, Inc.

A1 Sun, Inc. is a family-owned solar energy company based in Berkeley, California that has served Bay Area homeowners since 2007. Specializing in residential solar and energy storage solutions, A1 Sun offers comprehensive services from custom system design to installation and ongoing support. Their approach emphasizes quality over quantity—every project is handled by an experienced local team with deep roots in the community.
The company focuses on advanced system design tailored to each client’s current and future electricity needs while maximizing long-term value and aesthetics. They are known for integrating battery backup systems that provide blackout readiness; their installations can seamlessly switch to off-grid mode during outages with minimal disruption.
A certified Alameda County Green Business since inception, A1 Sun prioritizes sustainability throughout its operations—minimizing waste through recycling programs and using environmentally friendly materials whenever possible. With over 5,000 megawatts of renewable power installed locally, they have built a reputation for reliability, transparency (handling all permitting/paperwork), high-quality workmanship, and strong customer advocacy within the Bay Area community.