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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

26 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%
29 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

27 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

The time it takes to install solar panels depends on the number of panels and the size of your home, but installation takes between two and three days of work. While most contractors can install the panels over the course of a couple of days, switching to solar energy can take two to three months in total. This includes the time it takes to design the system, procure the parts, obtain the permits, install the panels, connect to the main power grid, and get an inspection.

The actual time it takes to construct the solar farm is relatively short, taking between 2 and 4 months on average. That timeline is dependent on site conditions, crew size, and the overall size of the solar farm.

However, the time it takes to get the ball rolling is significantly longer, ranging from 3 to 5 years. With a project of this scale, you’ll need to obtain all of the proper permits and approvals to start breaking ground, and depending on your location, that could be an extended process.

Solar batteries can be a great investment to help maximize your solar savings and make your system and home more valuable, but they’re most beneficial to customers who don’t have access to net metering. If your state or energy provider doesn’t provide net metering, batteries can be a great way to offset consumption even when your panels aren’t producing power. They also come with the added benefit of providing electricity through blackouts, so they’re valuable in areas prone to severe weather that could cause frequent blackouts. Your installer can help you decide if batteries are worthwhile.

If you’re deciding between a solar battery versus a generator for the best backup power solution, you can take a few factors into consideration. Solar batteries are quiet while generators can be quite loud. Generators have a lower up-front cost, but they require fuel and ongoing maintenance while solar batteries are more expensive but don’t have many ongoing costs.

  • Installing a new electrical meter box

  • Replacing your meter base

  • Replacing your service entrance cable 

The cost to install or upgrade an electrical meter box ranges from $100 to $650, including $50 to $250 for the unit. The meter base passes the power from your electric company to your panel. The cost to replace a meter base is roughly $50 to $250. 

Service entrance cables are electrical cables with multiple wires, bringing power from electrical companies to residential buildings. The cost to replace a service entrance cable ranges roughly from $1,000 to $1,500.

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.