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TRUSTED BY CASTRO VALLEY, CA HOMEOWNERS

  • Average homeowner rating star icon4.6
    Average homeowner rating
  • Verified reviews icon40
    Verified solar panel services reviews

Top-Rated Solar panel pros in Castro Valley - Updated Nov 2026

Avatar for ELLISON ELECTRIC AND SOLAR INC
ELLISON ELECTRIC AND SOLAR INC
5.0(
6
)
Solar Panel InstallSolar Panels For Electric System - Install - For Business

Serving Castro Valley, CA and surrounding areas

Approved

Super Service Award Winner

In business since 2024

Free estimates

Emergency services offered

"I recently had the pleasure of working with Ken at Ellison Electrical on a service panel upgrade for my electrical vehicle and completely rewired my new kitchen. Ken was incredibly patient, explaining every step of the process. He immediately understood the floor plan and installed everything to code. His attention to detail and knowledge was exceptional. The quality of his work is evident in every connection and fixture. The service panel upgrade was seamless, my kitchen looks amazing and now my home feels more secure and efficient. He was always punctual, respectful of my property. I highly recommend Ellison Electrical for any electrical project."
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+3

Response time2 days
Response rate100%
1 neighbors recently requested a quote
Avatar for NRG Clean Power
NRG Clean Power
4.6(
52
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved (Corporate)

In business since 1996

Free estimates

Warranties offered

"Roberto Sanchez Solar System, I interviewed 4 solar panel companies and I chose NRG because Will was able to explain everything well. He answered all my questions to my complete satisfaction. Friendly and honest, Will made the sales process very smooth and personable. Tiffany helped and coordinated the project to make sure everything goes well. She always got back to my emails and phone calls promptly. Installers completed the solar panels when I was at work. Came home and he solar panels were on the roof. Definitely a nice install and quality work was delivered. Lisa helped out with the financing on the HVAC. She was patient and I believe got me a lower amount that before. Solar edge app is great to use and straight forward. Highly recommended company thanks NRG. I am excited to use my new solar system!"
Rooftop Solar
Solar Installation
Solar Panel Install
Home Solar Install
Solar System Install

+5

21 neighbors recently requested a quote
Recommended by77%of homeowners
Avatar for SOLARSESAME INC
SOLARSESAME INC
5.0(
6
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2022

Free estimates

Emergency services offered

"I had a wonderful experience with Solar Sesame. My salesperson Emanuel was professional, courteous and truly awesome to work with... Thank you guys so much..."
11.21 kW, Shingle Roof
11.21 kW, Shingle Roof
11.21 kW, Shingle Roof
Solar Panel Install
Solar Panel Install

+20

Response time5 hrs
Response rate100%
31 neighbors recently requested a quote
Avatar for Power On Solar
Power On Solar
4.6(
5
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2016

Free estimates

We specialize in all your home solar panel and battery installs. We pride ourselves on the quality work we provide, while delivering great customer service! Check out our home solar offerings below and call -or- click to schedule a free estimate today.

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+1

26 neighbors recently requested a quote
Avatar for Soltari
Soltari
5.0(
3
)
Solar Panel InstallSolar Panels For Electric System - Install - For Business

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"I had Soltari install my solar panels and I’m really happy with how everything turned out. I was a little nervous going into it since I didn’t know much about the process, but they made it super easy to understand and handled everything. The team was professional, respectful, and just really easy to work with. They showed up when they said they would and made sure everything was done right. Now that it’s all up and running, I’m honestly so glad I decided to go with them. I’d definitely recommend them to anyone looking into solar 😊"
Tesla Powerwall
Full Backup Power
Energy Storage
Smart Monitoring
Emergency Power

+3

Response time6 hrs
Response rate100%
5 neighbors recently requested a quote
Avatar for Sunrun Inc
Sunrun Inc
5.0(
1
)
Solar Panel Install

Serving Castro Valley, CA and surrounding areas

Approved

In business since 2007

Free estimates

Emergency services offered

"The #1 home solar & battery company in America. We know going solar can be complicated. We are here as your expert guide every step of the way. With our customers, we are creating a planet run by the sun. Unrivaled home solar and battery experience \nWith 900,000 homes and counting, no one has more installation expertise.Smart technology \nAn ecosystem of innovative products that put you in control of your home energy needs. Payment solutions for every home \nTailored plans including predictable monthly payments, little-to-no money down, and no-debt options. The Sunrun Guarantee \nThe industry's most comprehensive repairs, maintenance & monitoring program. \n"

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Solar Panels FAQs, answered by experts

You shouldn’t hook up a solar panel directly to a battery. That can damage the solar battery and your appliances over time. Instead, install a charge controller between your solar panel and solar battery. Charge controllers regulate voltage, prevent overcharging, and minimize the amount of electrical current to protect your battery from voltage spikes.

Depending on the climate in your area, the best time to install solar panels is either winter or early spring. Summer is a fine time to install panels, too, but it tends to be the busy season, so prices may be higher and companies may have packed schedules. The installation process can take more time than expected between getting permits and finalizing a design, so start as soon as you can.

In most cases, installing solar panels will not void your roof warranty. To keep roof warranties intact, check your written warranty or call the manufacturer to ask about clauses regarding roof penetrations. You can also protect yourself by getting written approval or a modified warranty that specifically allows the solar installation type you’re planning. Then, hire a professional solar installer that follows roofing manufacturer instructions and protects the roof during installation.

There are a few qualifying questions you should ask a local solar panel company before hiring them:

  • Will you handle permits for the installation?

  • Does your total price include the equipment and labor?

  • How long do you expect the installation process to take?

  • What kind of workmanship warranty do you include with your installations?

  • Who should I contact if I have a problem with my system after installation?

  • Do you install the panels or outsource the work to third parties?

  • Will you file for solar incentives for me?

You’ll need to make sure you have a big enough solar panel to meet your well pump’s power demands, but you can use solar power to fully operate your well pump. It’s also a good idea to have battery storage to hold the solar power so you can still use your well pump after dark.

The Castro Valley, CA homeowners’ guide to solar panel services

From average costs to expert advice, get all the answers you need to get your job done.