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El Cajon
(855) 502-6363
★★★★★ 5.0 — 2,500+ Google Reviews
Expert Solar Installation in El Cajon, CA
Harness warm inland valley sunshine and start saving with Option One Solar — East County's trusted solar installer since 1970. El Cajon's East County valley position means hotter summers, less marine layer, and more sunshine hours than coastal San Diego — translating directly into higher solar output and larger monthly savings. Residential and commercial solar, battery storage, and full EPC services from a licensed local team.
54+ Years
Experience
2,500+
Installs
5-stars
Rated
Our Services
Complete Solar Services for El Cajon Homes & Businesses
Every service you need to go solar in El Cajon — design, installation, storage, and ongoing support.
Residential Solar Installation
Custom-designed rooftop and ground-mounted systems sized to maximize your El Cajon home's solar potential. With 272+ days of sunshine per year, your panels work hard every day to significantly reduce your SDG&E bill.
Commercial Solar Solutions
Scalable installations for El Cajon businesses — from small storefronts to large commercial properties. Reduce operating costs, meet sustainability goals, and take advantage of accelerated depreciation and the federal ITC.
Solar Battery Storage
Store excess energy with Tesla Powerwall and commercial BESS systems. Essential backup power for El Cajon's warm inland valley climate with more sunshine and heat than the coast — ensuring your home or business stays powered when the grid can't keep up.
System Monitoring & Maintenance
Proactive monitoring, routine inspections, and prompt repairs to keep your system running at peak efficiency. Our team understands East San Diego County conditions and is always nearby to keep your investment producing.
Solar Consulting & Design
Detailed site evaluations, shading analysis, and production modeling to guarantee the best performance for your El Cajon property. Every design is optimized for East San Diego County's unique sun angle and seasonal conditions.
Full EPC Services
End-to-end engineering, procurement, and construction for commercial projects. We manage permitting with City of El Cajon, SDG&E utility interconnection, inspections, and every detail in between.
Free Consultation
Start Saving — Free El Cajon Solar Estimate
No pressure, no guesswork. We start with your El Cajon property and SDG&E bills, and finish with a transparent proposal showing exactly how much you'll save and how quickly your system pays for itself.
Detailed property and shading assessment
Custom system design with production estimates
Transparent pricing with financing options
Federal tax credit and incentive guidance
No obligation — no pressure
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(855) 502-6363
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Our Community
Rooted in East San Diego County, Serving El Cajon
El Cajon deserves a solar contractor that's as committed to this community as the residents themselves. At Option One Solar, we've been serving East San Diego County since 1970 — and in that time, we've learned that every community has its own character, its own challenges, and its own solar potential. For El Cajon, that means warm inland valley climate with more sunshine and heat than the coast and El Cajon's inland valley location delivers more sunshine hours than coastal areas, maximizing solar production for East County homeowners. Our team designs systems that are specifically optimized for local conditions, ensuring maximum production and the strongest possible return on your investment. As a licensed C-10 and C-46 contractor with over 2,500 installations completed across Southern California, we bring both the credentials and the track record to earn your trust. Every project we complete in El Cajon is backed by our comprehensive 25-year warranty and the knowledge that our team will be here for the long term.
How It Works
Our Simple Solar Process in El Cajon
Going solar in El Cajon doesn't have to be complicated. Here's exactly how our process works, from first call to first kilowatt.
Free Site Assessment & Energy Review
We start by reviewing your El Cajon property and SDG&E energy bills together. Our team evaluates your roof condition, orientation, and any shading from nearby structures, then combines that with your actual monthly usage — so every recommendation we make is grounded in real data for your specific situation.
Custom System Design for El Cajon
Using your site data and East County's extra sunshine hours compared to the coast, our engineers design a system sized and positioned specifically for your property. We model annual production estimates, calculate your payback period, and present a fully transparent proposal with no surprises and no pressure.
Permits, Installation & SDG&E Interconnection
Our licensed C-10 and C-46 crews handle every detail — pulling permits with City of El Cajon, scheduling inspections, installing your system to code, and filing your SDG&E interconnection agreement. You stay informed at every milestone without managing any of it yourself.
System Activation & Ongoing Local Support
Once SDG&E approves your interconnection, we commission your system and walk you through monitoring your production in real time. Our team remains your local resource for any questions, maintenance, or service needs for the full life of your installation, backed by a 25-year warranty.
Why Choose Us
The Option One Solar Difference in El Cajon
From credentials to customer service, here's what makes Option One Solar the right choice for El Cajon.
Established in 1970
Over 54 years serving Southern California — including El Cajon — gives us an unmatched track record and depth of knowledge that newer contractors simply cannot match.
Dual Contractor License
Our C-10 electrical and C-46 solar contractor licenses ensure every El Cajon project meets California's highest standards for safety, engineering, and code compliance.
Lifetime Local Support
Our 25-year warranty isn't just a document — it's a promise backed by a team that has been operating in East San Diego County for over half a century and isn't going anywhere.
Deep Local Knowledge
We know El Cajon's neighborhoods, City of El Cajon building department, and SDG&E's interconnection process. That knowledge translates to fewer delays and smoother projects for our customers.
2,500+ Five-Star Reviews
Our reputation across Southern California is built on thousands of satisfied customers. El Cajon homeowners join a community of solar owners who trust Option One Solar to deliver.
Every Budget Covered
From zero-down solar loans to lease programs, we structure financing to maximize your El Cajon savings immediately. Our team walks you through every option with full transparency.
FAQ
Solar Installation FAQ for El Cajon Homeowners
Honest answers to the most common solar questions we hear from El Cajon customers.
Service Areas
Also Serving Nearby Communities
In addition to Apple Valley, Option One Solar proudly serves homes and businesses throughout the High Desert and Inland Empire.
Get Started
Ready to go Solar in El Cajon?
Take the first step toward energy independence. Whether you are protecting your home from rising SCE rates or powering your business with clean energy, our El Cajon team is ready to help.