- Services
Turn-Key Solar
From engineering and sourcing to wiring, installation and ongoing maintenance, we can handle it all, making solar a worthwhile investment for you.
Project Types
- Services
Turn-Key Solar
From engineering and sourcing to wiring, installation and ongoing maintenance, we can handle it all, making solar a worthwhile investment for you.
Project Types
Saving Arizona Time, Money and Hassle with Quality Commercial Solar Solutions and Dependable Service, Since 1999.
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Commercial Rooftop Solar Installations
Turn your rooftop into a revenue-generating asset with an industry-leading max-ROI rooftop solar panel system by Watt Masters.
Safe, Dependable ROI >>
Why Rooftop Solar?
Rooftop solar is the most cost-effective way for commercial buildings to offset energy costs without using extra land. From office buildings to multi-megawatt warehouse installs, Watt Masters is a leading commercial rooftop solar company in Phoenix, AZ, delivering rooftop solar installations with clean, code-compliant systems that maximize production, minimize disruption, and enhance long-term ROI.
- Efficient use of space, ideal when land is limited.
- Costs less than carports or ground-mount.
- Quickest path to cutting costs with solar.
- Minimal disruption to daily operations.
- Keeps solar equipment safely out of sight.
Where Rooftop Solar Works Best
Rooftop solar is one of the most efficient and space-saving ways to generate on-site power—and it’s especially valuable for businesses and facilities with high energy demands and unused roof space. Here are just a few of the ideal applications:
Warehouses & Distribution Centers
Large flat roofs offer ample space for high-output systems that can dramatically reduce operating costs.
Office Complexes & Retail Centers
Offset peak daytime usage while turning your building into a greener, more energy-efficient asset.
Schools & Government Buildings
Public facilities benefit from utility savings, sustainability goals, and long-term energy predictability.
Flat or Low-Slope Commercial Roofs
Perfect for solar installation with minimal structural changes—maximize surface area without sacrificing design.
Why Experience Trust Dependability Reputation Your Decision Matters >>
Why Watt Masters is AZ's #1 Commercial Rooftop Solar Company.
Rooftop solar isn’t just one of the things we do—it’s what we do best. It’s our #1 specialty, and the reason EPCs, property owners, and developers across Phoenix, Arizona keep coming back.
For over 25 years, we’ve been mastering the complexities of rooftop installations—from tight conduit routing to working safely on active commercial roofs without disrupting operations. Every wire, panel, and tie-in is handled in-house by our licensed team who live and breathe commercial solar.
If you need a crew you can trust for rooftop solar panel solutions for businesses in Arizona, done the right way the first time—this is what we’re built for.
150 +
Projects Completed
150000 +
Panels Installed
635 +
5★ Reviews
100 %
In-House Crew
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Satisfied Clients
Several Commercial Projects
Rick Cibik, Fort McDowell AdventuresI have been working with Tom Buehler for the past thirteen years. They have completed several commercial projects for our business. It is rare to find such a professional company that offers outstanding customer service along with quality workmanship.
EPC Partner - Several Commercial Solar Installs & Wiring
Don Herman, Empire Renewable EnergyPlease consider this an enthusiastic recommendation for Watt Masters, who's worked with me on solar installations since 1998, from 5 kW to 2.4 mW (24 panels to 8,000). Empire has awarded $3m+ and we plan to maintain this successful relationship for years to come.
Commercial Solar Panel Parking Canopy Installation
T.L. "Mac" Gowan, Lutheran Church of the Risen SaviorRegarding the very functional 62.5 KwH covered parking solar system for our congregation. The entire process was handled professionally. Most importantly, any issues that arose were continually addressed and resolved. Job site was neat and tidy. Staff polite and helpful.
Our Commercial Solar Specialties
Rooftop Solar
With countless installs on small offices to massive warehouses, rooftops are our specialty.
Solar Carports
Solar carports & canopies save costs, generate great power, and shade vehicles below.
Ground-Mount
Ground-mount solar is a great option when roof space is limited and land is available.
Frequently Asked Questions
How long does commercial rooftop solar installation take?
Most rooftop solar projects for commercial buildings are completed within a few weeks once installation begins. The full timeline, including design, engineering, and permitting, can take several weeks to a couple of months depending on the size and complexity of the system.
How much does a commercial rooftop solar system cost?
The cost depends on factors like roof size, system capacity, equipment selection, and structural requirements. In Phoenix, commercial rooftop solar typically ranges from $3 to $4 per watt before incentives. A site assessment is the best way to get an accurate estimate based on your building and energy needs.
Is my commercial building suitable for rooftop solar?
Most commercial buildings in Phoenix are good candidates for rooftop solar, especially those with flat or low-slope roofs. Key factors include:
- Roof condition and remaining lifespan
- Structural load capacity
- Available space
- Sun exposure and shading
A professional evaluation will confirm whether your building is a good fit and what system size makes sense.
What maintenance is required after installation?
Rooftop solar systems require minimal upkeep, but regular maintenance is important for long-term performance. This typically includes:
- Monitoring system output
- Inspecting inverters and electrical components
- Periodic panel cleaning to remove dust and debris
- Routine inspections to catch issues early
In Phoenix, dust buildup alone can impact performance if not addressed.
How much ROI can I expect from rooftop solar?
Rooftop solar systems in Arizona often deliver strong returns due to high sunlight exposure and favorable incentives. Most businesses see payback within 4 to 7 years, with long-term savings continuing for 20+ years. The exact ROI depends on your energy usage, system size, and available tax incentives.
What types of commercial roofs work best for solar systems?
Flat and low-slope roofs are typically the best fit for commercial solar installations because they allow optimal panel placement and easier installation. Metal roofs and reinforced roofing systems can also work well, as long as they meet structural requirements.
A proper engineering assessment ensures your roof can safely support the system and perform efficiently over time.