Residential and commercial solar use the same basic technology, but buying solar for a business is a different project from putting panels on a house. This guide explains the key differences in system size, electric bills, mounting options, financing and timelines, so you can ask better questions whichever kind of property you have.
Residential vs commercial solar at a glance
| Residential solar | Commercial solar | |
|---|---|---|
| Typical customer | Homeowner or small landlord | Business, nonprofit, school, property owner or operator |
| Typical system size | Usually a few kilowatts up to around 20 kW | Often tens of kilowatts to a megawatt or more |
| Where panels go | Pitched roof or a small ground mount | Flat roofs, ground mounts, carports and solar covered parking, building-integrated solar (BIPV) |
| Electric bill | Mostly energy charges (kWh), sometimes time-of-use rates | Energy charges plus, often, demand charges based on peak usage |
| Ownership and financing | Cash, loan, lease or power purchase agreement (PPA) | Cash, commercial loan, lease, on-site PPA; large buyers may also use off-site virtual PPAs |
| Approvals | Building permit and utility interconnection | Structural review, permits, utility interconnection studies and often several internal decision-makers |
| Timeline | Usually shorter | Usually longer, and more variable |
Residential vs commercial solar FAQ
Scale and complexity. Residential systems serve one household and are usually a single roof and a single decision-maker. Commercial systems are larger, sit on more varied sites, face a different utility rate structure, and usually need more engineering, approvals and sign-offs before construction starts.
Home systems are usually sized in single or low double-digit kilowatts (kW). Commercial systems often range from tens of kilowatts to a megawatt or more, depending on the building’s electricity use and the space available on roofs, ground or parking areas.
Many commercial utility rates include demand charges based on the highest level of power drawn during a billing period, in addition to energy charges for kilowatt-hours used. Solar mainly reduces energy charges; reducing demand charges may also require batteries or load management. Ask any installer to model your actual rate and 12 months of interval or bill data.
Common options include flat-roof systems, ground mounts on unused land, carports and solar covered parking, and building-integrated photovoltaics (BIPV), where the solar product is part of the roofing or canopy itself. Roof age, structure and the roof warranty should be reviewed before anything is installed.
Homeowners typically choose cash, a loan, a lease or a power purchase agreement (PPA). Businesses use similar tools at larger scale, such as commercial loans, leases and on-site PPAs, and some large buyers sign off-site virtual power purchase agreements. Compare the term, any price escalator, who owns and maintains the system, and what happens if the property is sold. This is general information, not financial advice.
Commercial projects usually take longer because of engineering, structural review, permitting and utility interconnection studies, and because more people inside the organization need to approve the project. Timelines vary widely by jurisdiction and utility, so ask for a written schedule with milestones.
Ask about similar commercial projects they have completed, who does the structural engineering, how they coordinate with your roofer and roof warranty, who handles operations and maintenance after commissioning, how the system will be monitored, and what production assumptions sit behind their estimate.
They often fall in between. The utility rate class, the interconnection rules that apply, and who pays the electric bills (owner or tenants) usually decide whether a project looks more like residential or commercial solar. Confirm these points before comparing quotes.
GoBien offers a free energy analysis for homes and businesses, and is building a directory of GoBien licensed, locally owned solar businesses you can contact.
Keep reading
Comparing offers? Our solar quote FAQ covers what every quote should include and the red flags to watch for. For business properties, see how to choose commercial solar companies, solar energy for companies, solar covered parking and virtual power purchase agreements.
Local guides: Charlotte, Chicago, Houston, Los Angeles, New York City, Philadelphia, Phoenix, San Antonio and San Diego, plus the GoBien directory.
Get a free energy analysis
Not sure which path fits your home or business? Tell us about the property and your monthly electric spend, and we’ll follow up with a no-cost look at what solar could do for it.
This page is general information for solar buyers and is not financial, legal or tax advice.
GoBien is a brand-license and platform relationship between independent businesses. GoBien does not sell franchises, and nothing on this site is an offer of an investment or a promise of revenue, profit or performance. Operators own and run their own companies. Details are governed by the actual agreements.