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SolarUnion - Profile & Reviews

We are a full-service solar developer and installer founded in the heart of Silicon Valley. We sell, design, install and service high efficiency solar systems to deliver clean electrical power at affordable rates. Our clients (residential homeowners) start to enjoy savings from Day 1, with significant cumulative savings over the life of the system. Our goal is to transform the market and enable all Californians to unlock the power of clean energy.

387 reviews

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  • "Non responsive"

    Reviewed Mar 07, 2022

    Vendor sent me an original quote then proceeded to want my personal info. Asked vendor for an updated quote based on different set of panels and inverters, vendor insists on wanting to talk on the phone and collect personal info.
    Is this even allowed per EnergySage agreements?
    I tried calling them and get the same story of wanting my phone number and wanting to fwd me to another rep to get me the info. I'm like pls connect me i'll provide the info and then i get hang up on.

  • "Long waiting game and can’t exactly tell as to when the panels and battery be available"

    "Long waiting game and can’t exactly tell as to when the panels and battery be available"

    Reviewed Mar 06, 2022

    So I signed an agreement with them last October and made 2 payments already and the building permit was approved. The only problem is its been 4 months already and no installation yet, sent the manager emails every month to follow up and all she can tell is that their supplier has not confirmed yet of its delivery. I am starting to think its gonna take them a year to install my system or worst if they can ever install it? Its like waiting indefinitely which I hate.

  • "Excellent experience"

    "Excellent experience"

    Reviewed Feb 21, 2022
    Updated Feb 21, 2022

    Solar Union's Tom Palmer is highly knowledgeable on solar and good at sorting out customer objectives. The only reason we did not go with him was lack of immediate availability of the battery we wanted. I definitely will recommend him to my family who plan to add solar.

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SolarUnion is the only Diamond Certified Solar Company in the State of California that offers a 25-year performance guarantee on (i) parts, (ii) labor, (iii) roof attachments and (iv) power output.
We are rated highest in quality on customer satisfaction, insurance coverage, license and business practices. We offer a premium solar experience to our customers.
The SolarUnion Team includes in-house certified C46 and C10 solar electricians and carefully vetted installers with decades of experience installing residential solar across California. We can execute on concrete tile roofs, flat roofs, tar and gravel roofs, metal roofs and foam roofs.
Each premium SolarUnion solar system includes:
*All permits, inspections and conversations with electrical, building, structural, environmental and fire inspectors. SolarUnion also works with your electric company for interconnection of the solar system to the grid
*Optimizers (one per panel) to fight shading issues, maximize system performance, and monitor output panel by panel.
*Premium inverters (rated excellent), battery backup ready.
*Individually-designed solar systems that are tailored to your needs and preferences. Each customer is assigned a SolarUnion Project Manager from Day 1 who is the primary contact throughout the entire solar process - from design to interconnection. We work with each of our customers to make sure they are satisfied with the components, service, aesthetics and long-term performance of their premium solar system.
*Complimentary monitoring hardware and software, including a mobile app.

  • Installation
  • Financing
  • Energy Auditing
  • Construction
  • Electrical Contracting
  • General Contracting
  • Solar Repair & Maintenance
  • Energy Efficiency
  • Solar PV
  • Energy Storage

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Get a custom solar estimate for your home

Get a custom solar estimate for your home

Based on your roof and actual offers in your area

Try Solar Calculator



SolarUnion Headquarters

1700 Montgomery Street, Suite 108
San Francisco, CA
94111 United States

Local Offices (3)

  • 42 N Sutter Street
    Stockton, CA 95202
  • 783 Goetschl Street
    San Diego, CA 92114
  • 815 Brazos St., Ste 500
    Austin, TX 78701

Workmanship Warranty

SolarUnion customers enjoy a 25-year power output, workmanship, parts and labor guarantee


SunPower Tax Lease Fund, GreenPACE Capital, Trina Solar, Renew Financial, HERO, YGrene Works, mPOWER.


Panasonic Authorized Installer with Panasonic INC providing a 25 year warranty parts and labor warranty on all SolarUnion systems. LG Pro installer. REC Certified Professional installer. SolarEdge certified installer.


Fully licensed electrical and solar contractor (C-10 Electrical and C-46 Solar)


Fully insured/bonded | Insurance policy in excess of $5,000,000 per event at the system level.

States served by SolarUnion

  • California CA ,
  • Texas TX