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San Marcos
(855) 502-6363
★★★★★ 5.0 — 2,500+ Google Reviews
Solar Installation in San Marcos, CA | Since 1970
Home to Cal State San Marcos and a thriving innovation economy, San Marcos attracts forward-thinking homeowners — many of whom have already made solar one of the smartest financial decisions they've made. Option One Solar has been serving North County communities for over 54 years, bringing C-10 and C-46 licensed expertise to every residential and commercial solar project we take on in San Marcos.
54+ Years
Experience
2,500+
Installs
5-stars
Rated
Our Services
Complete Solar Services for San Marcos Homes & Businesses
Every service you need to go solar in San Marcos — design, installation, storage, and ongoing support.
Home Solar Systems
Custom-designed rooftop and ground-mounted systems sized to maximize your San Marcos home's solar potential. With 270+ days of sunshine per year, your panels work hard every day to significantly reduce your SDG&E bill.
Commercial Solar Installation
Scalable installations for San Marcos businesses — from small storefronts to large commercial properties. Reduce operating costs, meet sustainability goals, and take advantage of accelerated depreciation and the federal ITC.
Battery Backup Systems
Store excess energy with Tesla Powerwall and commercial BESS systems. Essential backup power for San Marcos's warm, pleasant inland North County climate with reliable sunshine — ensuring your home or business stays powered when the grid can't keep up.
Performance Monitoring
Proactive monitoring, routine inspections, and prompt repairs to keep your system running at peak efficiency. Our team understands North San Diego County Inland conditions and is always nearby to keep your investment producing.
Custom System Design
Detailed site evaluations, shading analysis, and production modeling to guarantee the best performance for your San Marcos property. Every design is optimized for North San Diego County Inland's unique sun angle and seasonal conditions.
Engineering & Permitting
End-to-end engineering, procurement, and construction for commercial projects. We manage permitting with City of San Marcos, SDG&E utility interconnection, inspections, and every detail in between.
Free Consultation
Start Saving — Free San Marcos Solar Estimate
No pressure, no guesswork. We start with your San Marcos 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
Prefer to talk? Call us directly.
(855) 502-6363
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Our Community
Rooted in North San Diego County Inland, Serving San Marcos
When San Marcos homeowners and business owners choose solar, they deserve a contractor who understands their community — not a national franchise operating from a call center three states away. Option One Solar has served North San Diego County Inland for over five decades, and we bring that local knowledge to every project we take on in San Marcos. San Marcos' educated homeowner base and strong environmental values have made it one of the most solar-active cities in North San Diego County. We understand the local climate, the SDG&E rate structure, and the City of San Marcos permitting process — all of which directly impact how we design and install your system. That local expertise means fewer surprises, smoother permitting, and a system that performs as promised. Our C-10 and C-46 licensed team handles every phase of your project, from initial consultation through design, installation, and interconnection with SDG&E. And because we stand behind every installation with a 25-year warranty, we're always just a call away when you need us.
How It Works
Our Simple Solar Process in San Marcos
Going solar in San Marcos doesn't have to be complicated. Here's exactly how our process works, from first call to first kilowatt.
No-Obligation Consultation & Property Evaluation
Your first step is a free, no-pressure conversation with our team. We visit your San Marcos property to assess your roof, shading, available space, and current SDG&E rate tier — giving us everything we need to design a system that actually performs as promised from day one.
Tailored Design Built Around San Marcos
No two properties are alike, and neither are our system designs. We use detailed production modeling to optimize panel placement for your San Marcos home or business, taking full advantage of North County's consistent solar production to maximize both energy output and financial return.
Installation, City of San Marcos Permits & SDG&E Coordination
From submitting permit applications to City of San Marcos through final inspection and SDG&E grid interconnection, our licensed crew manages every step. Most San Marcos residential installations are physically complete in 1 to 3 days on-site.
Power On — and We Stay With You
After SDG&E grants permission to operate, your system goes live and starts generating clean energy immediately. We set you up with real-time monitoring, walk you through your production data, and remain available for service and support for the full life of your system.
Why Choose Us
The Option One Solar Difference in San Marcos
From credentials to customer service, here's what makes Option One Solar the right choice for San Marcos.
54+ Years of Experience
Founded in 1970, Option One Solar brings over five decades of expertise to every San Marcos project. Three generations of experience means your installation is in proven, capable hands.
C-10 & C-46 Licensed
We hold both California C-10 (Electrical) and C-46 (Solar) contractor licenses — the dual credentials required to handle any solar project in San Marcos, residential or commercial.
25-Year Warranty
Every San Marcos installation is backed by our comprehensive 25-year warranty covering equipment, workmanship, and system performance. Your investment is protected for decades.
Local North San Diego County Inland Experts
Our crews and project managers work throughout North San Diego County Inland every day. We understand the local climate, SDG&E rate structures, and City of San Marcos permitting process inside and out.
5-Star Rated
With over 2,500 five-star reviews from homeowners and businesses across Southern California, our track record speaks clearly. San Marcos customers consistently rate us at the top of the industry.
Flexible Financing
We offer solar loans, leases, and power purchase agreements to fit any budget. Our team will identify the financing structure that maximizes your savings from day one in San Marcos.
FAQ
Solar Installation FAQ for San Marcos Homeowners
Honest answers to the most common solar questions we hear from San Marcos 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 San Marcos?
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 San Marcos team is ready to help.