Independently Rated Highest in Quality
S e c o n d
Consecutive Year
Originally Earned:
April 2016
We declare that SolarUnion HAS QUALIFIED for and continues to meet the Ongoing Research and Rating Requirements for Diamond Certified® status.
Certificate #2351
(415) 236-2966

A recent residential solar installation by SolarUnion

SolarUnion provides a complete range of solar services for residential and light commercial clients throughout California. The company designs, sells, installs and operates photovoltaic (PV) solar systems using proven technology from manufacturers with strong warranties. Its certified solar technicians are trained to conduct solar-readiness audits, savings estimates and roof inspections; perform electrical panel upgrades; install solar electric vehicle charging stations; and more.

Executive Director Renzo Castillo says SolarUnion’s emphasis on solar ownership under a comprehensive performance guarantee has been critical for the company’s success. “We educate our clients to approach solar as an investment. To maximize their rate of return, we advise them to own a highperformance system for permanent electric consumption offset. While the impact on the electric bill is immediate, the most significant gains (savings) occur over time.”

SolarUnion proactively monitors every system to ensure it hits the company’s annual guaranteed kWh (output) number. For complete transparency, the company provides clients with monitoring capabilities at no extra cost so they can track performance as well. “If we don’t hit the contractually required kWh number, we fix the system and compensate (pay) the client for any lost output,” explains Mr. Castillo. “If the system overperforms, the client takes the extra output at no extra cost.”

Company Philosophy

“We want to be a reliable, long-term partner for our clients, so we focus on providing them with quality installations, strong guarantees and timely maintenance for their solar investments. Ultimately, our goal is to make sure every Californian has access to clean, Green energy at an affordable rate.” 

Serving Northern, Central and Southern California. Headquartered in San Francisco

Engineering, Procurement, Construction and Operation of Solar Systems
(Rooftop and Ground Mount)
Solar-Readiness Audits and Roof Inspections
Electrical Panel Upgrades
Solar EV Charging Station Installations

Solar Modules: Standard (Trina); Premium (LG); Platinum (SunPower) - Optimizer/Monitoring System: Tigo Energy - Inverters: ABB PowerOne; SMA - Waterproof Sealant: QuickMount; SnapNRack

Comparative Summary

Solar companies are constantly looking for ways to differentiate themselves from their competition, and those that have earned the prestigious Diamond Certified award are already several steps ahead. In addition to its Diamond Certified status, SolarUnion sets itself apart by offering solar ownership from day one under a comprehensive performance guarantee that covers components, workmanship and...

Frequently Asked Questions

Q: How long will it take to install my solar power system?
A: "The physical installation takes one day for small systems and two to three days for midsized systems. You should allow six to eight weeks from the time you sign the contract until your SolarUnion system gets interconnected to the grid. This...
Q: Will you protect my roof during the installation?
A: "Absolutely. Our solar installers have decades of experience on all types of roofs. We wrap the roof areas compromised by the solar installation and offer a 25-year workmanship guarantee on the attachments and waterproofing sealant. In the un...
Q: How long until I see a return on my investment?
A: "With SolarUnion, the deal is never underwater. You will start recovering your investment from day one by effectively locking your rate at a fraction of what you currently pay to your utility company. The overall, cumulative payback period is...

Industry Info

California homeowners have a lot to gain by investing in clean solar energy.
The residential solar industry is booming across the United States, but experts say residents of California are uniquely situated to reap more benefits from solar ownership than people living in other parts of the country. “The attractiveness...
Findings based on statistically reliable research from 28 surveys

Customer Satisfaction

Survey Question: On a scale of 1 to 10 how satisfied were you with the quality you received?
Chart.

Company Credentials

Workers Compensation
Liability Insurance
License Verification
Business Practices
Current Complaint File

Customer Loyalty

Survey Question: If you needed this product or service in the future, would you use this company again?
Chart.
96%
n = 28

Diamond Certified Qualification

Based on 28 customer surveys, we declare
SolarUnion
has passed all rating steps and has earned
The Diamond Certified Award
No. 2351
Continuously qualified since April 2016.
David Pak
Director of Ratings Research
American Ratings Corporation

Verbatim Survey Responses From Only Verified Customers

Vanessa H. Verified Customer Name
"They're knowledgeable, responsive, and upfront. There were no surprises, and I was always kept up-to-date with what was going on."
Research conducted by American Ratings Corporation. Ratings Methodology

Diamond Certified® Video Profile

Company Capabilities Table

SolarUnion
(415) 236-2966
DCID8883639373

Mon – Sun: 8am – 8pm
Staff On Call 24/7

Serving Northern, Central and Southern California. Headquartered in San Francisco

Renzo Castillo & Ivan La Frinere-Sandoval, Founders
5
10
1010382
Liability Insurance, Workers' Compensation
Stanford Latino Entrepreneurship Initiative Award
Engineering, Procurement, Construction and Operation of Solar Systems (Rooftop and Ground Mount); Solar-Readiness Audits and Roof Inspections; Electrical Panel Upgrades; Solar EV Charging Station Installations
Solar Modules: Standard (Trina); Premium (LG); Platinum (SunPower) - Optimizer/Monitoring System: Tigo Energy - Inverters: ABB PowerOne; SMA - Waterproof Sealant: QuickMount; SnapNRack
Residential; Light Commercial
Performance Guarantee: Parts (25 Years) + Workmanship (25 Years) + Output (25 Years), $1MM Roof Integrity Coverage
$0 Down Options Available for Ownership
San Francisco Solar

Photo & Video Gallery

Survey Responses For

SolarUnion

SolarUnion: Average 9.3 out of 10 based on 28 unique customer surveys of customer satisfaction.
Vanessa H. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They'll get the job done."

"They're knowledgeable, responsive, and upfront. There were no surprises, and I was always kept up-to-date with what was going on."

Michelle G. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They worked very closely with me around my specific needs and worked to insure that I got the best system for me now and in the future."

"The directness and ability to explain what I would be getting, if they haven't heard from me, they have good follow-up."

Manuel R. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They are inexpensive, and they are good."

"The price"

Katia V. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"I would recommend them. They are clear and professional. They are on time, and they do what they say they will do."

"I like the product that they gave me because it works. I think they are really good."

Lauren K. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They work hard to give you the best deal possible."

"I liked how they were willing to work with you to make sure you get the best possible deal."

Ana K. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They are a great company to go with if you choose solar."

"Everything was explained to me very professionally in a language I could understand. All of my phone calls were answered, and everything went perfectly."

Jason L. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"Very transparent, honest, and open book people, I was very happy with the experience. I even recommended them to others."

"It was a wonderful combination of value and quality."

Eric S. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"I feel like they are pretty straightforward. You are doing business with someone who is honest. They really wanted to customize the system to my needs. They understood my interest in having good, quality equipment. They made sure I got the most for my money, which was important to me. I got a personalized experience and dealt with one person throughout the whole experience. They didn't pressure me into buying anything. They had top-tier equipment for a reasonable price."

"The no-pressure sales"

Ian I. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"Everything is straightforward, and they are doing another project for me as well."

"The ease of working with them, they have a good price, and they use a good quality product."

Judy S. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"I would recommend them highly."

"They were very prompt, and they responded my questions very accurately and thoroughly."

Aldo L. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They have one of the greatest quality panels on the market, and their prices are very accommodating and affordable."

"The service, they provided a lot of follow up, and they were right there every step of the way."

Julio L. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"It was a remarkable experience."

"Very professional team"

Sabeen M. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They have an outstanding service. I'm happy."

"They answered all of my questions, and they were very responsive."

Fernando H. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"They do a good job, they are not too expensive, and if you have any questions, they are always right there. They are also helpful if you have any problems."

"Obviously, that the unit works, and it delivers what they told me it would deliver."

Rob M. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"The very best quality for the lowest price point"

"The customer service was excellent, and they went above and beyond my expectations. They were very helpful in obtaining my government rebate as well as my PG&E authorization. They are heads and tails above all the other installers whom I interviewed."

Richard K. Verified SolarUnion Customer Name
Q1:10 out of 10
Q2:Yes
Q3 & Q4:

"Very easy, very personable, and not too big, they are effective."

"They have a good price and a good product."

Iyahid I. Verified SolarUnion Customer Name
Q1:9 out of 10
Q2:Yes
Q3 & Q4:

"They are very competitive price-wise."

"Their prices"

Annette E. Verified SolarUnion Customer Name
Q1:9 out of 10
Q2:Yes
Q3 & Q4:

"As far as explaining the process and working with you for the financing and making sure that all your needs are met, they are very good at that. The only flaw that transpired during the process was the fault of the subcontractor. There was a mess as far as the scheduling was concerned. I had to miss work expecting that they would be coming in, but they called saying that one of the subcontractor guys was in the emergency room. This is the only flaw I can remember."

"There were two people I was able to interact with, one face-to-face and one online. The face-to-face person was able to address all of my needs, and he was very willing to make sure that all of my questions were answered. If was not sure if something was technical or financial, he would direct me to the online guy to answer my questions."

Brad A. Verified SolarUnion Customer Name
Q1:9 out of 10
Q2:Yes
Q3 & Q4:

"They are a smaller company, so they were responsive and had personal service."

"Their price was competitive."

Rene S. Verified SolarUnion Customer Name
Q1:9 out of 10
Q2:Yes
Q3 & Q4:

"They are definitely a reliable company and a good source for solar."

"Just the ease of the entire process, there was little to no hassle, and it was very straightforward. They were very professional."