Commercial solar

Commercial PV built like residential.

Stamped engineering, in-house W-2 crews, and Tier 1 panels — for warehouses, light industrial, multifamily, and storefronts across Connecticut, Massachusetts, and Rhode Island.

Get a free quote 203-903-4091

By the numbers

  • System size 25 – 500 kW
  • Federal ITC 30 – 50%
  • Project timeline 8 – 16 wks
  • Crew size 6 – 12 techs
What's included

Every commercial install, end to end.

The same standards we apply to a 9 kW home install — applied to a 200 kW warehouse roof. Engineering, install, and paperwork all in-house.

Engineering done locally

Stamped engineering and structural review handled in-house. We know the AHJ requirements in every CT, MA, and RI town we work in.

In-house commercial crew

OSHA-30 trained leads on every commercial roof. Same W-2 model as our residential side — no outsourced labor.

Tier 1 commercial gear

Trina, Silfab, and Q CELLS panels paired with SMA, SolarEdge, or Tigo string inverters depending on roof and shading.

Turn-key permitting

Building, electrical, and utility interconnection — we file every form. Net metering or virtual net metering, depending on your state and program.

A typical commercial project

What 25 – 500 kW actually looks like.

Roughly the median Teamsun commercial job. Specifics vary with roof type, shading, available area, and your utility — these are central tendencies, not promises.

  • System size

    25 – 500 kW

    Roof or ground

  • Federal ITC

    30 – 50%

    Plus bonus depreciation

  • Project timeline

    8 – 16 weeks

    Engineering → live

  • Roof types

    Flat / metal / asphalt

    Ballasted or attached

  • Battery integration

    CT ESS · MA CS

    Demand-response payments

  • Crew size

    6 – 12 W-2 techs

    Per project, scaled to size

Commercial equipment

Tier 1 panels. Three-phase inverters.

Modules and inverters chosen per-project for your roof loading, shade profile, and three-phase service. Brand named on the proposal — never swapped at install.

Tier 1 panel

Trina Solar

Vertex S+ commercial bifacial modules — high power density for flat roofs and commercial ground mounts.

Capacity
500 – 615 W
Warranty
25 yr product · 30 yr power
Tier 1 panel

Silfab Solar

North American manufactured Tier 1 modules — Buy America-eligible for projects with domestic-content bonus ITC.

Capacity
420 – 480 W
Warranty
25 yr product · 30 yr power
Tier 1 panel

Q CELLS

Q.PEAK DUO XL commercial modules — strong shading tolerance and low-light performance for variable rooflines.

Capacity
480 – 540 W
Warranty
25 yr product · 25 yr power
Tier 1 inverter

SMA Sunny Tripower

Three-phase commercial string inverter, modular up to 100 kW — the workhorse of mid-size commercial.

Capacity
15 – 100 kW
Warranty
10 yr (extendable)
Tier 1 inverter

SolarEdge HD-Wave Commercial

Three-phase string inverter with DC optimizers on every panel — module-level monitoring for 500+ kW arrays.

Capacity
14 – 120 kW
Warranty
12 yr (extendable to 25)
Tier 1 battery

FranklinWH (commercial)

Stackable AC-coupled battery for small commercial and multifamily — eligible for CT ESS commercial track.

Capacity
13.6 kWh per unit · stackable
Warranty
15 years
Our approach

Our process,
refined through
9,000 installs.

Design
01.

Design

A 15-minute call, then a remote or on-site visit. Aurora-based design, panel and battery brand named on the proposal.

Build
02.

Build

Permits filed, utility interconnection submitted, and equipment staged at our Bristol warehouse.

Install
03.

Install

Local crew, local trucks. Most homes finished in 2 – 3 days. Final inspection scheduled before we leave.

Perform
04.

Perform

PTO from your utility, ITC and rebate paperwork filed, and 25 years of local service after the system goes live.

Your incentive stack

Federal, state, and utility
stacked.

On a typical $30K install in Connecticut, the total incentive stack lands between $13,000 and $17,000. We file every form with you.

Federal ITC

30%

Tax credit, claimed in the year of install. Locked through 2032.

CT ESS battery rebate

Up to $7,500

One-time check from CT Green Bank, paid through your installer.

Net metering

Full retail

1:1 offset on what your panels send back to Eversource or UI.

CT property tax exemption

$300 – $700/yr

System value excluded from your assessment. Sales tax also exempt.

Commercial financing

Cash. Loan. PPA. Pick your tax appetite.

Three commercial structures. Cash and loan let you claim the federal ITC and MACRS depreciation. A PPA passes those benefits to a third-party owner in exchange for $0 down.

Cash

Best lifetime ROI

Pay upfront. Claim the full 30 – 50% federal ITC plus MACRS depreciation in year one. Speak with your CPA about the depreciation schedule.

Best for: tax-paying owners with the cash on hand

Loan

Most popular

5 – 25 yr terms

Secured commercial financing, $0 down available. You still claim the federal ITC and depreciation. Most common structure for owner-occupied buildings.

Best for: spreading project cost while keeping tax benefits

PPA

Third-party owned

A third party owns the system and sells you the power at a fixed rate, typically below your utility from day one. They claim the ITC and depreciation; you claim the bill savings.

Best for: owners with low tax appetite or limited capital

Lease

Operating lease

Pre-paid or monthly operating-lease structure for owners who want third-party O&M and predictable expense lines. Talk to your CPA about classification.

Best for: clean-balance-sheet owners who want hands-off

Where we work

9,000+ rooftops across three states.

Connecticut, Massachusetts, and Rhode Island. Every pin is a Teamsun install. We're licensed in ME, NH, VT, and FL too.

CT · 5,400+ installs MA · 2,900+ installs RI · 700+ installs
Check your town
What customers say

Trusted by homeowners
who value quality.

“Teamsun was the only crew that walked the roof, named the panel brand, and answered every question without checking with someone. Same lead tech came back a year later when I added a battery.”
Robert P. Homeowner · Glastonbury, CT
“Three of my neighbors had Teamsun, so I called them. The crew was on my street five days after I signed.”
David L. Homeowner · West Hartford, CT
“They knew the historic district secretary by first name. Saved us six weeks on permitting alone.”
The Hwang family Homeowners · Glastonbury, CT
“Same lead tech who installed it came back four years later to swap an inverter under warranty. No charge, no excuses.”
Sandra M. Homeowner · Worcester, MA
Commercial FAQ

Questions property owners ask before they sign.

What size commercial system can Teamsun install?

We design and install 25 kW to 500 kW commercial PV systems, on flat roofs, sloped commercial roofs, and ground mounts. We do not pursue utility-scale (1 MW+) work — that is not our specialty.

Do you handle the engineering, structural review, and permits?

Yes. Stamped electrical and structural engineering is done in-house or via our partner PE firm. Building permits, electrical permits, and utility interconnection forms are all filed by Teamsun — turn-key.

How does the federal ITC work for commercial solar?

The base federal ITC for commercial solar is 30%. Domestic-content, energy-community, and low-income bonuses can stack to push effective credits as high as 50%. Speak with your CPA about MACRS depreciation, which is a separate stacking benefit. We do not provide tax advice — but we do hand you a complete project file your accountant can run with.

What state programs do you participate in?

Connecticut: ESS commercial track and Buy All Systems. Massachusetts: Connected Solutions C&I track and SMART program (where eligible). Rhode Island: Renewable Energy Growth (REG) commercial program. Every state-specific paperwork bundle is filed by Teamsun.

Can you add a battery to a commercial array?

Yes. We integrate FranklinWH stacks for small-to-mid commercial and route projects into demand-response programs (CT ESS commercial, MA Connected Solutions). Larger battery deployments (250 kWh+) are evaluated case-by-case.

How long does a commercial install take?

8 – 16 weeks from signed contract to a working system, depending on system size and AHJ. Engineering and permits typically take 4 – 8 weeks; install runs 1 – 4 weeks on-site; utility interconnection adds 2 – 4 weeks at the end.

Do you offer a commercial PPA?

Yes. Cash, secured loan, and third-party PPA structures are all available for commercial projects. Best fit depends on your tax appetite — cash and loan let you claim the ITC and depreciation; a PPA passes those benefits to the third party in exchange for $0 down.

Do you use subcontractors on commercial projects?

No. Every Teamsun commercial install is W-2 in-house, including OSHA-30 trained leads and licensed electricians. The same model that gets us 9,000+ residential installs scales to commercial.

What's the smallest commercial project you'll take?

Roughly 25 kW. Below that we usually scope it as a large residential job. We will tell you on the first call whether your project is a better fit for our residential or commercial team.

Can I see a commercial project in person?

Yes. Once we have a signed NDA with the property owner, we coordinate site walks at completed installs in your county. Local references included on every commercial proposal.

Free quote

Ready to go solar?
Request a quote today.
It's free.

A 15-minute call with a designer who knows your town. No closer on the line. No follow-up unless you ask for one. $0 down options available.

Request a free quote 203-903-4091

Bristol office

A person picks up.
Mon – Fri, 8am – 6pm.

Service area

CT · MA · RI
Licensed in ME · NH · VT · FL

Free terms

$0 down, free consult.
No credit card required.