Power Consumption Needs

Commercial properties require more energy, depending on the size and type of building. A typical home will have different energy needs than, say, a dentist’s office. For example, your home may have a couple of computers running, a TV, and some small appliances. A dentist’s office, on the other hand, has high-tech equipment running all day, a TV in the main foyer, several computers, X-ray devices, lights, and more. A dentist’s office would require far more power. A large retail chain store would require even greater amounts.

Residential systems are typically sized between 5–15 kW. Commercial properties might need around 50 kW or more, depending on the size of the building. Factories, warehouses, or schools often have much higher energy demands.

Roofs and Space

Residential properties typically have pitched, shingled roofs. Space is limited, so it must be maximized. A good installer won’t just place panels on the south side but will strategically use all available space on the roof.

Commercial properties usually, though not always, have flat roofs. Businesses may also have additional options, such as large parking garages—ideal spaces for solar arrays. Flat roofs and open lots offer flexibility in panel positioning.

Financing and Incentives

Homeowners often lease panels, take out loans, or purchase them outright. They can usually take advantage of federal or state tax credits.

Commercial companies may use power purchase agreements (PPAs), operating leases, or special financing. There are often additional federal and state programs for commercial properties. Check with your installer to see what incentives apply.

Permits

Residential solar projects require city approval and sometimes county approval. This process can take a few weeks to a month.

Commercial solar projects take longer. They often require engineering studies, detailed planning, and utility coordination before installation.

A good installer will be licensed, insured, and familiar with all local laws and regulations for both residential and commercial properties.

How Long Does It Take?

Once permits are secured, residential installations typically take 1–3 days.

Commercial installations can take weeks to months, depending on the scope of the project. Larger projects also involve more stakeholders, which adds complexity.

Structural Considerations

Most of the time, residential installations don’t require modifications to the structure.

Commercial installations, depending on size and scope, may require significant modifications or reinforcements to support the system.

Electrical Systems

Residential systems typically connect to a standard single-phase electrical system.

Commercial systems often require three-phase connections, larger switchgear, and may need demand-management integration.

What About Maintenance?

Residential systems should be cleaned with non-abrasive products—no harsh tools or chemicals. They should also be monitored occasionally to ensure proper performance.

Commercial systems usually require regular inspections, cleanings, and ongoing monitoring as part of the building’s maintenance routine. Businesses should consider whether their maintenance team can handle this or if it should be contracted out. A good solar company will explain all options.

Final Thoughts

The differences between residential and commercial solar may seem obvious, but a good solar company will understand every option and provide the best advice and equipment for your needs.

Contact us with any questions about your commercial or residential solar project.