Diamond Certified Companies are Rated Highest in Quality and Helpful Expertise.

  • Why this rating is the most accurate.
  • Our editors gather deep company info.
  • Performance is Guaranteed.

Diamond certified companies are top rated and guaranteed

Why Trust Diamond Certified Solar Companies Rated Highest in Quality?

Photo: Urban Design Solar (2017)

Only the best solar companies in Napa County have earned the Diamond Certified award by scoring Highest in Quality in the most accurate and rigorous ratings process anywhere. You’ll never be fooled by fake reviews, since all research is performed by live telephone interviews that verify only real customers are surveyed. Most companies can’t pass this test. That’s why you’ll feel confident when you choose a Diamond Certified solar company listed below. Simply click on the name of a Diamond Certified company below to read ratings results, informational articles and verbatim customer survey responses.

Thousands of customers of local companies have been interviewed in live telephone calls, and only companies that score Highest in Quality in customer satisfaction–a 90+ on a 100 scale–as well as pass all of the credential-based ratings earn Diamond Certified. By requiring such a high score to qualify, the Diamond Certified program cuts out mediocre and poorly performing companies. If you want quality, you’ll have confidence in choosing Diamond Certified companies. And you’re backed by the Diamond Certified Performance Guarantee.

Read moreRead less

SELECTED PHOTOS FROM THESE TOP RATED COMPANIES

View Comments
Shares

INDUSTRY INFORMATION AND RESEARCHED ARTICLES BY THE DIAMOND CERTIFIED RESOURCE

INDUSTRY INFORMATION - Napa County – Solar
  • GAF

  • Amerimax

  • Duralum

  • Lennox

  • Enphase

  • SolarWorld

  • SolarEdge

  • LG

  • SMA

  • Sunpower

Know What You Want
Know What You Want from a Solar Array for Your Home or Business

Making an investment in harvesting solar energy is an important decision.  You will get the best results from your investment if you have some idea of what you want your solar investment to do for you before you begin talking with representatives from solar contractor/installers in Napa County.  Be able to answer the following:

  • Do I want a Diamond Certified company that is rated best in quality and backed by the Diamond Certified Guarantee?
  • What do I want from an investment in solar power?
  • Do I want to reduce the amount of electricity I buy from the utility by generating some of my own?
  • Do I want to generate more electricity than I need so that I can sell some for a profit?
  • Do I want my solar investment to provide hot water and heating/cooling
  • If I’m interested in generating electricity, have I used a free solar calculator to give myself some idea of the cost and benefits? (Free solar calculator)
Read moreRead less
What To Ask In Person
Questions to ask in person

Some questions simply cannot be answered until a qualified site assessor visits your home or business, as the quality of sunlight can vary significantly from site to site.

  • How will the site assessment work?
  • Is my home or business site better suited to one type of solar power over another?  If so, why?
  • If the site is suitable for solar thermal, how much work will be required to make the array deliver heating, cooling, and hot water beyond simply getting the array onto my roof or other part of my property?
  • How does selling back electricity work in Napa County?
  • How long does an installation take?
  • When can I receive a written estimate?
Read moreRead less
  • What To Ask References
    Questions for references

    It’s best to choose a Diamond Certified solar contractor/installer because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a solar contractor/installer in Napa County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.

    If you can’t find a Diamond Certified solar contractor/installer within reach, you’ll have to do some research on your own. If you do, it’s wise to call some references provided by your solar contractor/installer. Keep in mind, though, that references provided to you by a solar contractor/installer are not equal in value to the large random sample of customers surveyed during the Diamond Certified ratings process. That’s because references given to customers from companies are cherry-picked instead of randomly selected from all their customers. So the contractors will likely give you a few customers to call that they know are satisfied.

    If you do call references on your own, specifically ask for a list of the company’s 10 most recent customers. This will help avoid them giving you the names of only customers they know were satisfied.

    • Did you have a solar array installed at your home or business by (name of the company in question)?
    • Did you receive a site assessment from (name of the company in question)?
    • What kind of solar array did you have installed?
    • How satisfied were you with the work?
    • Has the solar array operated the way you expected?
    • Have your energy bills been reduced as much as you expected?
    • (If you have a PV array) Are you selling electricity back to the utility?
    • If so, how has the experience been for you? 
    • Are you making as much money as you expected?
    • How does payment for excess electricity work for you?
    • Would you recommend that someone else invest in a PV array large enough to sell electricity back to the utility?
    • How did the federal and state incentives figure into your decision to invest?
    • How did the federal and state incentives affect your ability to pay for the solar investment?
    • Do you have any advice or information we haven’t touched on yet?
    Read moreRead less
  • Review Your Options
    Before You Hire

    The Diamond Certified symbol has been awarded to companies that scored Highest in Quality in an accurate ratings process.

    It’s best to choose a Diamond Certified solar contractor/installer because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a solar contractor/installer in Napa County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews.

    It’s best to choose a Diamond Certified solar contractor/installer because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a solar contractor/installer in Napa County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.
    If a Diamond Certified solar contractor/installer isn’t available or suitable, you will have to do some research on your own.  An Internet search with the terms “solar contractor installer” and “Napa County” will yield a number of results.

    Once you have found a solar contractor/installer, you will want to be certain that the company is properly licensed.  All contractors performing work valued at $500 or more must hold a current valid license from the Contractors’ State License Board.  Licenses can be checked at the CSLB website.  Additionally, the North American Board of Certified Energy Practitioners (NABCEP) PV installer certification is a voluntary certification that provides a set of national standards by which PV installers with skills and experience can distinguish themselves from their competition. Certification provides a measure of protection to the public by giving them a credential for judging the competency of practitioners.

    Ways to make their job easier
    Learning the basic terms and concepts of solar energy will make your working relationship with your solar contractor/installer much easier.  Having realistic expectations about the cost of an array and how long it might take for an array to pay for itself also will help.  Use a solar calculator to give yourself an idea of the money involved.  Know what you are spending on energy before having a site assessment.  Be prepared to hear that your site may not be suitable for a specific type of solar array, but do ask for a explanation.

    Read moreRead less
  • How To Work With
    Before You Hire

    It’s best to choose a Diamond Certified solar contractor/installer because all certified companies have passed an in-depth ratings process that most other companies can’t pass. If you want quality from a solar contractor/installer in Napa County and the greater Bay Area, you can have confidence choosing a Diamond Certified company. Diamond Certified reports are available online for all certified companies. And you’ll never be fooled by fake reviews. That’s because all research is performed in live telephone interviews of actual customers.

    If a Diamond Certified solar contractor/installer isn’t available or suitable, you will have to do some research on your own.  An Internet search with the terms “solar contractor installer” and “Napa County” will yield a number of results.

    Once you have found a solar contractor/installer, you will want to be certain that the company is properly licensed.  All contractors performing work valued at $500 or more must hold a current valid license from the Contractors’ State License Board.  Licenses can be checked at the CSLB website.  Additionally, the North American Board of Certified Energy Practitioners (NABCEP) PV installer certification is a voluntary certification that provides a set of national standards by which PV installers with skills and experience can distinguish themselves from their competition. Certification provides a measure of protection to the public by giving them a credential for judging the competency of practitioners.

    Ways to make their job easier
    Learning the basic terms and concepts of solar energy will make your working relationship with your solar contractor/installer much easier.  Having realistic expectations about the cost of an array and how long it might take for an array to pay for itself also will help.  Use a solar calculator to give yourself an idea of the money involved.  Know what you are spending on energy before having a site assessment.  Be prepared to hear that your site may not be suitable for a specific type of solar array, but do ask for a explanation.

    Read moreRead less
  • Be a Good Customer
    How Can You Be a Good Solar Energy Customer?

    It’s the solar contractor/installer’s responsibility put in quality solar arrays using the best possible installation techniques. But you play a big part in the success of your contractor/installer, too. Here are a few simple steps you can take to be a good customer when hiring a Napa County solar contractor/installer.

    • Be clear and upfront with the solar contractor/installer. Let them know what you want from your solar investment, the long-term outcome you’re expecting and specific ways they can satisfy your expectations.
    • Remember, a friendly smile goes a long way!
    • Before you hire a solar contractor/installer in Napa County, restate your expectations and goals, and reiterate to the solar contractor/installer representative your understanding of the agreement. Most problems with local solar contractor/installers occur because of a breakdown in communication. By being clear about your expectations and theirs, you can avoid most conflicts.
    • Ask your solar contractor/installer if you should call to check on the progress or if he will call you with updates.
    • Be sure your service representative has a phone number where they can reach you at all times while they’re installing your solar array. The work will move along more smoothly if your solar contractor/installer can reach you for any necessary updates, questions or work authorizations.
    • When your contractor contacts you, return calls promptly to keep the solar contractor/installer on schedule.
    • Pay for the work promptly.

    Why would you want to be a good customer? Solar contractor/installers in Napa County appreciate customers who are straightforward, honest and easy to work with. Your good customer behavior sets the tone from your end and creates an environment conducive to a good relationship. Things may very well go smoother and any problems may be more easily resolved.

    Read moreRead less
Check The Work
Check work against invoice

Make certain you know what you are buying.  Once the work is complete, check your invoice carefully to make certain you received what you have paid for.  Compare the estimates you were given to the final prices on the invoice.  Politely but firmly request explanations for discrepancies.  Honest mistakes can be made; checking the invoice can help correct them promptly.

Read moreRead less
Written Warranties
Ask for Written Warranties

Your solar array is a significant investment.  It should function for several years at least.  The array itself should come with a warranties.  The quality of the installation also should come with a minimum guarantee.

Read moreRead less
Top 10 Requests
Top 10 Brand Requests

When investing in solar, you will want to be certain that you are investing in value.  Your solar array should provide you with many years of operation.  The brands listed below are among the most widely used in Napa County.  Some companies have established reputations for reliability, while others are newer companies working with exciting advancements in the solar industry.

DayStar Technologies
DayStar manufactures thin-film photovoltaic panels aimed principally at utilities and commercial customers.  However, the design of DayStar’s arrays is such that residential customers can use the thin-film panels in a standard mounting system.

First Solar Products   
First Solar offers a complete line of solar thermal products for use in all climates and all seasons.  Evacuated tubes and special coatings allow for the heating of water even under cloudy skies and freezing tempertatures.

Fronius USA LLC
Fronius produces inverters for use with photovoltaic arrays, turning the DC current produced by PV into AC current used in your home or business and on the grid.

GE Energy
GE offers a very large selection of energy products for a variety of scales of operation.  Included in the GE line are photovoltaic arrays for residential and commercial customers with good performance under a variety of conditions, a GE warrantee, and end-of-life recycling.

Mitsui Comtek 
Mitsui provides photovoltaic arrays to Berkeley-based PowerLight Corporation, which uses a patented rooftop installation system to lower installation costs.

Pacific SolarTech 
Pacific SolarTech offers a blended photovoltaic and concentrator technology in the form of modules which can be used by residential and commercial customers as well as utility-level generators.  The concentrator feature allows the modules to use a fraction of the silicon used in conventional arrays.

Sharp Solar
Sharp has an extended history in the solar industry and offers photovoltaic arrays for residential, commercial, and utility use.

Sunpower Corporation   
Sunpower Corporation offers photovoltaic arrays of several types to residential and commercial customers, government customers, and power plant customers.  Sunpower offers up to a 25-year warrantee on their products and on installation by their network of dealers.

Sunwize Technologies
Sunwize provides photovoltaics for residential and commercial customers both on- and off-grid as well as government customers.  Sunwize has 20 years in the solar business and serves a wide variety of customers in a wide variety of applications.

Terra Solar
Terra Solar specializes in photovoltaics for residential and commercial customers.  The company is vertically integrated and has its own research and development, manufacturing, and sales.  Terra solar offers thin-film PV for building integrated photovoltaics (BIPV).

Read moreRead less
Glossary Of Terms
Solar Energy FAQ

Q: Why choose a Diamond Certified solar contractor or solar system installer?

Q: Why choose a Diamond Certified solar contractor or solar system installer?
A: Diamond Certified helps you choose a solar system contractor or solar installer with confidence by offering a list of top-rated local companies who have passed the country’s most in-depth rating process. Only solar contractor/installer rated Highest in Quality earn the prestigious Diamond Certified award. Most companies can’t pass the ratings. American Ratings Corporation also monitors every Diamond Certified company with ongoing research and ratings. And your purchase is backed by the Diamond Certified Performance Guarantee. So you’ll feel confident choosing a Diamond Certified solar contractor/installer.

Q:  Why should I invest in solar panels for my home or business?
A:  A solar array is an investment that will pay for itself and then earn a profit in most locations in the US. This is certainly true almost everywhere in California.

Q:  Solar energy seems expensive, so how can I make my money back?
A:  New financing options enable homeowners and businesses to start saving money as soon as their solar panels are active.  Every dollar you don’t spend on buying energy from a utility is a dollar in your pocket.  This adds up quickly, and it adds up even more quickly as energy costs rise.

Q:  If solar power works and can be cost-effective, why does it need government support?
A:  The federal government has supported every major energy source through R&D support and various incentives.  Oil, natural gas, hydroelectric, biofuel, and nuclear industries all have received government support and continue to receive support today because energy drives our economy.  The State of California supports solar partially to help increase the state’s supply of electricity without building new power plants and partially because solar energy can be harnessed right here in California.

Q:  Don’t I have to have lots of expensive batteries to have solar electric power?
A:  Batteries are only necessary if you want to get off the grid.  As long as you stay connected to the grid, you don’t need to install batteries with your new solar power system.

Q:  Do I have to get off the grid to use solar power?
A:  No, you can stay connected to the grid to use solar electric power.  If your solar array generates electricity, your home or business will draw power from your array first, then the grid as needed.  If your array doesn’t generate as much electricity as you need, or if it’s night, your home or business will draw what is needed from the grid.  If you generate more power than is needed, the excess will go to the grid and earn you money.

Q:  Aren’t all solar products made in China?  I want to support American business.
A:  U.S. solar installations generated $6 billion in direct value in 2010, including manufacturing sales.  Of this 75% ($4.4 billion) went into the US economy.

Q: How do I know what kind of solar array is right for my home or business?
A: The answer depends on what you want from your solar array and how much money you are willing to invest.  A small passive solar thermal array is relatively inexpensive and can provide you with heat for water and heating your home.  An active solar thermal array costs more but heats water and heats and cools your home more efficiently than a passive array.  Photovoltaic (PV) arrays are more expensive than solar thermal arrays, but you can use them to offset electricity consumption in your home or business and even sell energy to the local utility.  A Diamond Certified solar contractor/installer can help you determine the right kind of solar array for your home or business based on your specific site, your needs, and your desired level of investment.

Read moreRead less
Frequently Asked Questions
Agencies and Associations for Solar Energy Systems

State of California Department of Consumer Affairs (DCA) (http://www.dca.ca.gov/)
Solar Energy Industries Association (SEIA) (http://www.seia.org/)
California Solar Energy Industries Association (CALSEIA) (http://calseia.org)
American Solar Energy Society (ASES) (http://www.ases.org/)
Northern California Solar Energy Association (http://www.norcalsolar.org/)…

State of California Department of Consumer Affairs (DCA) (http://www.dca.ca.gov/)
Solar Energy Industries Association (SEIA) (http://www.seia.org/)
California Solar Energy Industries Association (CALSEIA) (http://calseia.org)
American Solar Energy Society (ASES) (http://www.ases.org/)
Northern California Solar Energy Association (http://www.norcalsolar.org/)
Solar Electric Power Association (SEPA) (www.solarelectricpower.org)

Read moreRead less