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Solar Installer GuildUnited States · independent

Diablo Solar & Electrical Services, Inc.

Solar energy equipment supplier · Concord, CA

What the listing shows you

4.4★

228 Google reviews

What it doesn’t

12%

rated 1–2★

typical in Concord, 12%

Newest review held

Aug 2026

newest held review this month

Google's rating breakdown · all 228 reviews

Rated 1–2★
12%
typical in Concord, 12%
Posted an update
2 months ago
the company posting to its own Google profile
Replies to reviewers
73%
of the 30 reviews we hold

Its one and two star share is level with the typical installer in Concord. Across California, 385 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 30 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 Concord, on one axis

0% rated 1–2★30%

Each mark is one company we hold in Concord whose Google breakdown has been read, placed by its share of one and two star reviews. Diablo Solar & Electrical Services, Inc. is the red one. The amber line is the middle of that set, which includes suppliers and maintenance businesses as well as installers.

What reviewers said

  • 1★ · around July 2026

    I think the ladies that do the communication at the office were past politicians because it’s hell to speak or communicate simple things to them. They speak to you like your dumb and nasty attitude no clear answers or help whatsoever. Hung up on me and won’t pickup my calls after calling back multiple times. I recommend you guys run for office you’ll do great.

  • 1★ · around April 2026

    Pathetic and incompetent service. Never respond to calls and voicemails. Claim to send emails (incorrect id’s).Customer service is non existent!! No follow ups to repairs and maintenance. They have an excuse for everything and their …

  • 1★ · around January 2026

    Their employees trespass someone's home and deny to make it right. Sounds like a irresponsible company I wouldn't want to do business with. Incompetent employees, irresponsible employers.

  • 5★ · around August 2026 · the company replied

    Diablo Solar is always the best. Great work. They installed my panels 12+ years ago, and both of us are still here! Very nice, knowledgeable, professional staff. They get the job done.

  • 5★ · around August 2026 · the company replied

    Diablo Solar installed my original pool solar heating system 12 years ago and they just replaced the system with new panels. Nothing lasts forever. I was happy with the work and knowing they were still in business meant that they are continuing to do good work for there customers new and old.Highly recommend them!!

  • 5★ · around August 2026 · the company replied

    Diablo Solar, as always, was professional, accommodating, and helpful with changes we made at the last minute. The crew couldn’t have been any nicer to work with, kudos to Diablo Solar!

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

  • efficiency 21
  • pool solar installation 14
  • courteous staff 7
  • warranty 6
  • scheduling 5
  • inverter replacement 5
  • solar panel replacement 5
  • repairs 4
  • on time 3
  • experienced staff 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.

What the company says about itself

Taken from its own website. We have not checked any of it, and a sentence on a website is not evidence.

  • Established

    “company Locally owned and operated since 1984 Over 250 years of combined, direct…”

  • Years in business

    “Locally owned and operated since 1984 Over 250 years of combined, direct and active solar…”

Its website also mentions licence number, but not in a sentence we can quote cleanly.

Elsewhere

  • It posts on X and Facebook. A page that stopped posting years ago tells you something a listing will not.

When they say they are open

Sunday
Closed
Monday
8 a.m. to 5:30 p.m.
Tuesday
8 a.m. to 5:30 p.m.
Wednesday
8 a.m. to 5:30 p.m.
Thursday
8 a.m. to 5:30 p.m.
Friday
8 a.m. to 4 p.m.
Saturday
Closed

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 around Concord

1–2★3★4★5★gauge 0–20%typical here, 12%

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 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.

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