Unclaimed business profile
Ranked #1 of 2 solar installers in Berkeley
4.9 · 57 reviews

A1 Sun

solar installers · Berkeley, CA

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About this business

We specialize in 100% solar satisfaction.

Contact

Protected
  • Berkeley, CA
  • (510) 526-
  • a1su

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Review rating

Verified on Yelp
4.9/ 5

57 reviews on Yelp

5
46
4
11
3
0
2
0
1
0

Distribution estimated from 5 sampled reviews on Yelp.

Ranked #1 of 2 solar installers in Berkeley by RHAWK Score.

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Recent reviews

Latest 5 of 57
B.D. O.
5.0

A1 Sun is a true local gem, committed not only to providing excellent project management and customer service, but also to hiring fairly and retaining skilled staff.

via yelp · 4/10/2026
Jim B.
5.0

I tried to do business but they determined it was much more advantageous economically for me to repair my existing system.

via yelp · 2/11/2026
Michael A.
5.0

Excellent customer service. I had a problem with my solar and their service was outstanding.

via yelp · 2/11/2026
Tor N.
5.0

Larry and Kathleen worked extremely hard and rapidly, to get our rebate application paperwork completed and submitted in time for us to get the higher rebate rate.

via yelp · 12/10/2025
T N.
4.0

Late last year there was a PG&E power surge that wiped out the battery backup system's motherboard.

via yelp · 12/10/2025

Local reputation ranking

Top 2 solar installers in Berkeley by review reputation.

#1
of 2
1
A1 Sunthis profile
4.957 reviews
A+
2
Go Microgrid
4.69 reviews
B+

This ranking uses one public review source. Claimed profiles are scored across all eight sources.

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