Company lists · Data refreshed September 2026

Top 25 Off grid solar system designers based in the United States

Name: Off grid solar system designers based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 4,313 companies tracked

RevenueBase identified 4,313 off grid solar system designers headquartered in the United States as of September 2026 and tracks 89,343 professional contacts across them, including 28,655 with verified work emails. San Diego is the largest hub.

This list covers off grid solar system designers headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 17, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 17, 2026 86% judged on-target in blind review

4,313Companies

89,343Contacts tracked

28,655Verified emails

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The 25 largest off grid solar system designers based in the United States

Ranked by team size

Top 25 of 4,313 off grid solar system designers based in the United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to off grid solar system designers: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Sunrun	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 17, 2026	10001+	7,974 contacts →
	Indirect evidence “Life runs on clean energy.” Source: RevenueBase Database · checked Sep 17, 2026
2	Enphase Energy	Strong evidence	Fremont, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	3,130 contacts →
	Strong evidence “Enphase Energy is a global energy technology company and the world’s leading supplier of microinverter-based solar and battery systems.” Source: RevenueBase Database · checked Sep 17, 2026
3	FTI	Indirect evidence	Menasha, WI, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,741 contacts →
	Indirect evidence “Faith Technologies Incorporated (FTI) is a dynamic organization comprised of construction, engineering, manufacturing and renewable energy experts.” Source: RevenueBase Database · checked Sep 17, 2026
4	Sunpower Corporation	Indirect evidence	Richmond, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	2,675 contacts →
	Indirect evidence “We believe clean energy and backup storage should be accessible to everybody.” Source: RevenueBase Database · checked Sep 17, 2026
5	Trinity Solar	Partial evidence	Wall Township, NJ, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,794 contacts →
	Partial evidence “Trinity Solar is one of the largest privately held residential solar companies in the nation.” Source: RevenueBase Database · checked Sep 17, 2026
6	Solv Energy	Partial evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,286 contacts →
	Partial evidence “SOLV Energy is a renewable energy solutions provider for utility solar, energy storage, and high voltage projects in North America.” Source: RevenueBase Database · checked Sep 17, 2026
7	Blue Raven Solar	Strong evidence	Orem, UT, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,168 contacts →
	Strong evidence “Blue Raven Solar, a SunPower Company, is a retailer of residential home solar systems.” Source: RevenueBase Database · checked Sep 17, 2026
8	Qcells North America	Partial evidence	Irvine, CA, United StatesHQ checked Sep 17, 2026	501-1,000	954 contacts →
	Partial evidence “Qcells is a renowned complete energy solutions provider in solar cell and module, energy storage, downstream project business and energy retail.” Source: RevenueBase Database · checked Sep 17, 2026
9	Wanzek Construction, Inc., A Mastec Company	Indirect evidence	Fargo, ND, United StatesHQ checked Sep 17, 2026	1,001-5,000	933 contacts →
	Indirect evidence “Wanzek Construction, Inc, a MasTec Renewables company, is a leading general construction contractor and clean energy services company headquartered in Fargo, North Dakota.” Source: RevenueBase Database · checked Sep 17, 2026
10	ION Solar	Partial evidence	Provo, UT, United StatesHQ checked Sep 17, 2026	501-1,000	912 contacts →
	Partial evidence “Ion Solar is a premium, full-service solar provider.” Source: RevenueBase Database · checked Sep 17, 2026
11	d.light	Strong evidence	San Francisco, CA, United StatesHQ checked Sep 17, 2026	501-1,000	908 contacts →
	Strong evidence “d.light is a global leader and pioneer in delivering affordable solar-powered solutions designed for the two billion people in the developing world without access to reliable…” Source: RevenueBase Database · checked Sep 17, 2026
12	Powersecure, INC	Indirect evidence	Durham, NC, United StatesHQ checked Sep 17, 2026	501-1,000	740 contacts →
	Indirect evidence “PowerSecure, a Southern Company subsidiary, is a leading provider of innovative energy solutions to electric utilities and their industrial, institutional, and commercial…” Source: RevenueBase Database · checked Sep 17, 2026
13	SEL Construction Corporation	Indirect evidence	Loomis, CA, United StatesHQ checked Sep 17, 2026	n/a	722 contacts →
	Indirect evidence “Experienced commercial contractor specializing in renewable energy, electrical, and roofing projects for privately-owned buildings as well as state/local government buildings in…” Source: RevenueBase Database · checked Sep 17, 2026
14	LUMIO	Indirect evidence	Lehi, UT, United StatesHQ checked Sep 17, 2026	5,001-10,000	719 contacts →
	Indirect evidence “We’re on a mission to make power personal.” Source: RevenueBase Database · checked Sep 17, 2026
15	Baker Electric	Indirect evidence	Escondido, CA, United StatesHQ checked Sep 17, 2026	501-1,000	680 contacts →
	Indirect evidence “Baker Electric is a full-service electrical contractor and energy infrastructure expert headquartered in Escondido, California.” Source: RevenueBase Database · checked Sep 17, 2026
16	Depcom Power, INC	Partial evidence	Scottsdale, AZ, United StatesHQ checked Sep 17, 2026	1,001-5,000	624 contacts →
	Partial evidence “DEPCOM Power, a Koch Engineered Solutions Company, is a leading solar energy solutions partner providing Development Support, Engineering, Procurement & Construction (EPC)…” Source: RevenueBase Database · checked Sep 17, 2026
17	Nexamp	Partial evidence	Boston, MA, United StatesHQ checked Sep 17, 2026	201-500	607 contacts →
	Partial evidence “Nexamp is leading the transformation to the new energy economy with proven solutions for the deployment and operation of solar energy assets.” Source: RevenueBase Database · checked Sep 17, 2026
18	Greentech Renewables	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	595 contacts →
	Indirect evidence “As Greentech Renewables, we prioritize our commitment to providing customers with exceptional service and top-tier products from prominent renewable energy manufacturers.” Source: RevenueBase Database · checked Sep 17, 2026
19	Posigen	Partial evidence	St. Rose, LA, United StatesHQ checked Sep 17, 2026	501-1,000	507 contacts →
	Partial evidence “PosiGen is the nation's leading residential solar and energy efficiency provider.” Source: RevenueBase Database · checked Sep 17, 2026
20	Freedom Solar Pros LLC	Partial evidence	Chandler, AZ, United StatesHQ checked Sep 17, 2026	51-200	484 contacts →
	Partial evidence “The future of Solar Sales” Source: RevenueBase Database · checked Sep 17, 2026
21	Noresco	Partial evidence	Westborough, MA, United StatesHQ checked Sep 17, 2026	201-500	481 contacts →
	Partial evidence “NORESCO, a part of Carrier Global Corporation, helps customers modernize aging building systems and upgrade energy and water infrastructure to meet evolving demands.” Source: RevenueBase Database · checked Sep 17, 2026
22	REC Solar	Partial evidence	San Luis Obispo, CA, United StatesHQ checked Sep 17, 2026	n/a	471 contacts →
	Partial evidence “Founded in 1997, REC Solar has emerged as a leader in the solar industry, installing 800+ solar and storage solutions for commercial and public sector customers nationwide.” Source: RevenueBase Database · checked Sep 17, 2026
23	Titan Solar Power	Partial evidence	Santa Ana, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	459 contacts →
	Partial evidence “EnergyAid acquired Titan Solar Power's intellectual property (IP) in March of 2025 through bankruptcy court.” Source: RevenueBase Database · checked Sep 17, 2026
24	Sunder Energy	Partial evidence	Sandy, UT, United StatesHQ checked Sep 17, 2026	201-500	422 contacts →
	Partial evidence “We don’t settle at Sunder, so you can expect exceptional service from start to finish in your switch to solar.” Source: RevenueBase Database · checked Sep 17, 2026
25	Signal Energy	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	409 contacts →
	Indirect evidence “Signal Energy is a leading full service design/build contractor providing Engineering, Procurement, and Construction (EPC) services for renewable energy & infrastructure projects.” Source: RevenueBase Database · checked Sep 17, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: off grid solar system designers. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names off grid solar system designers.
Partial evidence: Its own public description names part of off grid solar system designers, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name off grid solar system designers. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 4,313 off grid solar system designers based in the United States

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Off grid solar system designers based in the United States at a glance

As of Sep 17, 2026

32.1%Verified-email coverage

20.7Average contacts per company

11-50Median size (employees)

1.8%Largest-city concentration · San Diego

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,756

11-50

1,764

51-200

580

201-500

110

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 4,313 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among off grid solar system designers, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in the United States whose own description of what they do matches “off grid solar system designers”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names off grid solar system designers), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among off grid solar system designers, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 28,655 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 17, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Off grid solar system designers by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names off grid solar system designers, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many off grid solar system designers are there based in the United States?

RevenueBase identified 4,313 off grid solar system designers headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Sunrun, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most off grid solar system designers?

San Diego leads with 79 headquartered companies, followed by Houston (69) and Austin (57).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 28,655 verified decision-maker contacts tracked across these 4,313 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 17, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.