Free bill analysis - bring a power bill, get the production math for your actual roof, panel brands like Qcells and REC compared side by side
If the pitch starts at your door and ends with "sign tonight for the special," sleep on it. The sun will still be there tomorrow; so will we.
Before
After
Before
After
Before
AfterFast, Reliable Commercial Solar Installation Across San Diego
Commercial solar installation in San Diego usually runs $2.10 to $3.40 per watt, which puts a typical 100 kW rooftop system between $210,000 and $340,000 before the federal tax credit. Most warehouses and office buildings we quote go from first site visit to utility interconnection in 8 to 14 weeks. Gus’s Solar handles the whole job with our own crew, and a live person answers the phone at (877) 550-6892 any hour you call. If you’re looking at a commercial roof in Point Loma, a distribution center in National City, or a carport in La Mesa, we’ll give you real numbers off your actual SDG&E bill, not a brochure.
Why Gus’s Solar Is San Diego’s Preferred Commercial Solar Installation Company
Gus Petrakis founded this company in 2011, and he still puts his own name on the work. When a commercial customer in San Diego calls, they get the owner on the phone, not a call center in another state. That matters when you’re signing a six-figure contract for a rooftop system that needs to perform for 25 years. Gus’s crew does the install. No subs, no hand-offs, no disappearing after the paperwork clears.
We’ve spent over a decade working in San Diego’s commercial markets. We know which roofs in Mission Hills need reinforcement before racking goes up, and which industrial buildings near the 905 freeway corridor can handle a ground-mount array. Our customers see us again: at the hardware store, at the permit counter, at the job site when we come back to check a string level or clean a panel array that’s underperforming. The 90-Day Done Right Promise backs every job in writing. If it isn’t right, Gus makes it right, and one call brings him back.
Our L.O.C.A.L. values aren’t a slogan. Local roots, on time, community first, accountable, loyal. We’ve lived them in San Diego since day one. Every quote is built off your actual utility bill and your actual roof, and we tell customers to take two weeks before signing anything. If a salesman needs an answer tonight, the answer is no. That’s how we work, and that’s why San Diego building owners keep calling.
Our Commercial Solar Installation Services in San Diego
Gus’s Solar handles the full Commercial Solar Installation scope for businesses across San Diego. Four services cover most of what local building owners need.
Commercial Rooftop Solar
Rooftop systems on San Diego warehouses, retail buildings, and office parks are the core of our commercial work. We survey the roof, check the structural capacity, map the sun exposure, and build a system sized to your actual load profile. For flat commercial roofs in Miramar or Kearny Mesa, we often use ballasted racking that doesn’t penetrate the membrane. For sloped tile roofs in older Mission Hills buildings, we use custom flashing kits and standoffs rated for clay S-tile. A 50 kW rooftop system in San Diego typically costs $105,000 to $170,000 installed, before tax credits and any SDG&E interconnection fees.
Commercial Battery Storage
Battery storage is now the centerpiece of nearly every commercial solar proposal we write in San Diego. Since NEM 3.0 took effect in April 2023, exporting excess generation to SDG&E earns near-zero credit value. The economics almost always favor pairing panels with batteries so your building consumes its own generation instead of sending it to the grid for pennies. We regularly design FranklinWH aPower systems for small commercial sites and Tesla Powerwall or SolarEdge battery banks for mid-size facilities. A 60 kWh commercial battery installation in San Diego usually runs $45,000 to $85,000, and it changes your payback math dramatically when upper-tier SDG&E rates exceed 45 to 50 cents per kWh.
Warehouse & Industrial Solar
Large, flat-roof warehouses and industrial buildings in San Diego’s commercial corridors, from Otay Mesa to Poway, are ideal for high-output arrays. These projects often exceed 200 kW and require detailed structural engineering, wind-load calculations, and SDG&E interconnection studies. We handle the engineering, the permitting, and the utility paperwork. A 200 kW warehouse system in San Diego typically lands between $420,000 and $680,000 before incentives, depending on roof condition and equipment choice.
Solar Carport Installation
Carports make sense for San Diego businesses with open parking lots and limited rooftop space. A solar carport shades vehicles, generates power, and often avoids the structural questions a 40-year-old roof brings. We’ve built carport arrays for medical offices in Hillcrest and trucking depots in National City. Carport systems run higher per watt than rooftop, usually $3.20 to $4.10 per watt in San Diego, because the steel structure adds significant material and labor cost. But for the right property, the dual use of parking and generation pencils out.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Diego
We install and wire equipment from Tesla, Enphase, SolarEdge, and FranklinWH, along with panels from SunPower, Qcells, REC, and Canadian Solar. We keep common replacement parts and connectors stocked at our San Diego office so a failed optimizer or a corroded MC4 doesn’t leave a commercial array down for a week. When a SolarEdge inverter throws a fault on a warehouse in National City, we can often get a technician and the right part there same day. That local parts availability is one of the quiet advantages of working with an owner-operated shop instead of an out-of-state installer.
Common Commercial Solar Installation Problems We See in San Diego
San Diego’s specific conditions create specific failures. Here’s what we see regularly, and what we do to prevent them from the first day.
- Salt-air corrosion within a mile of the coast. Standard aluminum racking and non-marine MC4 connectors start corroding within three to five years in Point Loma, Ocean Beach, and Shelter Island. Exposed copper terminations and standard aluminum extrusions don’t survive the marine environment. We spec anodized or stainless racking and marine-rated connectors on every coastal San Diego job, because warranty calls are avoidable with the right materials from the start.
- Production estimates built on inland irradiance data. The June Gloom marine layer suppresses morning production heavily in the coastal ZIPs, 92106 and 92107 especially, and can cut daily output for weeks at a stretch in late spring and early summer. A proposal modeled on inland San Diego sun hours will overstate first-year output by 10 percent or more, and the customer notices at true-up. We model coastal sites separately, with meaningfully lower morning production, and we tell you before you sign what the realistic numbers are.
- Solar-only proposals that ignore NEM 3.0 battery economics. Any San Diego commercial proposal that shows panels exporting to the grid without storage is, in most cases, financially broken. SDG&E’s upper-tier rates are the highest in the continental US, regularly above 45 to 50 cents per kWh, but the export credit under NEM 3.0 is a fraction of that. If you generate at noon and consume at 4 p.m., you need a battery between those hours. We won’t quote a solar-only system without showing you the battery math alongside it.
- 100-amp panels on older commercial and mixed-use buildings. The 1920s through 1950s building stock across San Diego, from North Park to Ocean Beach, frequently has 100-amp electrical panels that were never designed for a solar-plus-battery interconnection. That line item, usually $3,000 to $6,000 for a commercial panel upgrade, surprises customers who only compared per-watt pricing. We flag it during the first site visit, not at the permit counter.
Pricing for Commercial Solar Installation in San Diego, CA
Commercial solar installation in San Diego runs $2.10 to $3.40 per watt for rooftop systems, with carports at $3.20 to $4.10 per watt. A 50 kW rooftop system lands between $105,000 and $170,000. A 200 kW warehouse array runs $420,000 to $680,000. Commercial battery storage in San Diego adds $45,000 to $85,000 for a 60 kWh system, more for larger banks. Coastal jobs in Point Loma, Ocean Beach, and La Jolla run 8 to 15 percent higher than inland projects because marine-rated hardware costs more and the engineering is more involved. Panel upgrades, roof reinforcement, and SDG&E interconnection fees all move the final number. Call (877) 550-6892 and bring us a bill. We’ll bring you the math, with no signature wanted tonight.
| System Type | Typical Size | San Diego Price Range |
|---|---|---|
| Commercial rooftop | 50 kW | $105,000 - $170,000 |
| Warehouse / industrial | 200 kW | $420,000 - $680,000 |
| Solar carport | 100 kW | $320,000 - $410,000 |
| Battery storage | 60 kWh | $45,000 - $85,000 |
| Main panel upgrade | Commercial | $3,000 - $6,000 |
Those are real ranges from San Diego projects we’ve quoted and built. Your building’s roof condition, electrical service, distance from the coast, and load profile all move the number. That’s why we build every quote off your actual SDG&E bill, not a per-watt guess. Free estimates, and a senior and veteran 10 percent discount that never expires.
We Also Serve Cities Near San Diego
Our crews work throughout the metro. Beyond our San Diego service area, we regularly install commercial systems in Lemon Grove, La Mesa, Coronado, and National City. Same crew, same L.O.C.A.L. standards, same live person on the phone. Call (877) 550-6892 to find out when we can be there.
Serving San Diego, CA - Our Local Coverage Area
We’re based in the San Diego area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Commercial Solar Installation in San Diego
NEM 3.0 makes exporting power to SDG&E financially pointless for most San Diego businesses, with export credits worth only a fraction of the 45 to 50 cents per kWh SDG&E charges at upper tiers. The math now favors pairing panels with battery storage so your building self-consumes its own generation. A solar-only system that exports during peak sun hours and pulls from the grid at night can see payback stretch by years. Call (877) 550-6892 and we’ll run your actual bill through both scenarios, solar-only and solar-plus-battery, so you see the difference in writing.
Salt air forces marine-rated materials. Anodized or stainless racking, marine-grade MC4 connectors, and corrosion-resistant mounting hardware run 8 to 15 percent more than standard spec, and the corrosion risk demands them. Buildings within a mile of the water in San Diego also face stricter wind-load engineering requirements. It’s not a markup, it’s the cost of a system that won’t fail in year five. We quote the right hardware the first time.
Yes. The late-spring and early-summer marine layer suppresses morning production in coastal San Diego ZIPs, especially 92106 and 92107, often for weeks at a stretch. Inland sites 8 to 10 miles east see far less of it. If a proposal models Ocean Beach with the same irradiance as El Cajon, first-year output will fall short by roughly 10 percent. We derate coastal production estimates explicitly and show you the lower number before you sign.
Look for a degradation rate of 0.50 percent per year or lower, which is standard on premium panels from Qcells, REC, and SunPower. That means the panel still produces around 87 to 88 percent of its original output at year 25. Cheap panels with 0.70 to 0.80 percent degradation lose more than a fifth of their production over the system’s life. In San Diego’s high-rate SDG&E territory, that difference is real money. We quote the year-25 output, not the day-one brochure number.
Many do. Older buildings in North Park, Mission Hills, and Point Loma frequently still run 100-amp service, which cannot handle a commercial solar-plus-battery interconnection. The upgrade usually costs $3,000 to $6,000 and must happen before the utility signs off. We check this during the first site visit and include it in your quote, so it doesn’t surprise you at the permit stage. Call (877) 550-6892 for a free on-site electrical assessment.
Written by Gus Petrakis, Owner at Gus’s Solar, serving San Diego since 2011.