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Solar Installer GuildUnited States · independent

Sierra Solar Inc.

Solar energy system service · Mammoth Lakes, CA

What the listing shows you

4.7★

19 Google reviews

What it doesn’t

5%

rated 1–2★

typical in California, 1%

Newest review held

Feb 2026

newest held review 7 months old

Google's rating breakdown · all 19 reviews

Rated 1–2★
5%
typical in California, 1%
Posted an update
—
we saw no owner post, which is not the same as none existing
Replies to reviewers
5%
of the 19 reviews we hold

Its one and two star share is 4 points above the typical installer in California. Across California, 571 of the 1,529 installers whose breakdown Google has published carry a higher share than this one.

The percentages are Google’s own arithmetic over every review it holds, not a sample we assembled. Separately we hold 19 review texts for this company, quoted below. Google publishes review ages rather than dates, so every date here is approximate.

Every company we hold in California, on one axis

none

1–5%

6–10%

11–20%

over 20%

Every company we hold in California whose Google breakdown has been read, grouped by their share of one and two star reviews. Sierra Solar Inc. is in the highlighted group.

What reviewers said

  • 4★ · around February 2026

    Zach was quick to assess the property and did a great job of explaining the product that he offered and letting me decide if he was a good fit (he didn't feel like a pressuring salesman). He took on the job at a difficult time for the solar industry with the impending termination of the tax credit. The project had some delays and bumps along the way—communication was poor at times—but he saw the job through to the end. I believe he did a good job. Very happy with my system thus far. No regrets with my decision to go w Zach and his team (Abbie, Evan, etc). Most importantly, I think he will be c

  • 5★ · around November 2025

    We hired Sierra Solar to install some panels and a new inverter/batteries for an off grid system. He was professional, very reasonably priced, and completed the work quickly. VERY happy with Sierra Solar!

  • 5★ · around September 2025

    Sierra Solar installed panels at the office I work at in Bishop and was such a pleasure to work with! They kept us informed through the process and were super responsive whenever we had questions. The entire process went much faster then expected. Grateful for Zach and his dedicated team for getting the office up and running with clean energy!

Reviewer names are not published here. Negative reviews are shown first because they are the ones a listing hides, not because they are more representative.

What reviewers keep mentioning

  • communication 6
  • responsiveness 3
  • competent crew 3
  • efficient work 2
  • batteries 2
  • easy to work with 2
  • system performance 2
  • affordable bid 2
  • fast installation 2
  • quick panel replacement 2

Topics Google derives from the review text, with how often each appears. A frequent topic is not a good one: “price” turns up in praise and in complaints alike.

Elsewhere

When they say they are open

Sunday
Open 24 hours
Monday
Open 24 hours
Tuesday
Open 24 hours
Wednesday
Open 24 hours
Thursday
Open 24 hours
Friday
Open 24 hours
Saturday
Open 24 hours

As Google published them when we last read the listing, not a live check. Ring before you drive anywhere.

Who Google shows alongside them

Google’s own “people also viewed” set, in Google’s order. It is Google’s comparison, not ours.

The ones without a link have no page here, either because Google does not categorise them as solar businesses or because we could not match the name to a listing with confidence.

Other installers in California

1–2★3★4★5★gauge 0–20%typical here, 1%

Ordered by how much we can tell you about each, which is not an order of quality. We do not know which of these is better and would not say if we did.

What we don't know

  • The date above is the newest review we hold, which is not necessarily the newest that exists — we hold a large share of Google's reviews, not all of them.
  • We found nothing on a website for this company that states a warranty, a licence or how long it has traded.
  • We do not verify licences, insurance or bonding. Nothing here has been checked against a state licensing board.
  • We cannot tell you what an installation costs, and we hold nothing about the equipment they fit.

Something wrong here? Tell us and a person will read it.

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