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.
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.
By the numbers
- System size 25 – 500 kW
- Federal ITC Up to 40%
- 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.
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
Up to 40%
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.
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
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
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
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)
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)
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,
Our process,
refined through
9,000 installs.
01.
Design
A 15-minute call, then a remote or on-site visit. Aurora-based design, panel and battery brand named on the proposal.
02.
Build
Permits filed, utility interconnection submitted, and equipment staged at our Bristol warehouse.
03.
Install
Local crew, local trucks. Most systems installed & completed in one day. Final inspection scheduled before we leave.
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
Federal, state, and utility
stacked.
Residential ITC no longer applies in New England, but with high energy costs, state rebates, and CT ESS coverage from $5,000 up to 100% by location, our systems will always save you money. Commercial systems also stack up to 40% federal ITC. We file every form with you.
Federal ITC
Up to 40%
Still available for commercial systems. Residential ITC no longer applies in New England, but our systems still save homeowners money on high energy costs.
CT ESS battery rebate
From $5,000
Certified CT ESS Install Program Partner. Minimum $5,000 rebate — depending on location, up to 100% of the battery cost can be covered.
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 up to 40% 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 popular5 – 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
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.”
“Three of my neighbors had Teamsun, so I called them. The crew was on my street five days after I signed.”
“They knew the historic district secretary by first name. Saved us six weeks on permitting alone.”
“Same lead tech who installed it came back four years later to swap an inverter under warranty. No charge, no excuses.”
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 starts at 30% and stacks up to 40% with domestic-content, energy-community, and low-income bonuses. 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.
Project consultation
Have a solar project
Have a solar project
in mind? Let's talk.
Tell Teamsun about your property, energy goals, and questions. We will help you identify the right next step for the project.
Start with the property
Share the address,
utility, and project goal.
Confirm availability
Teamsun will confirm
coverage for your address.
Match the next step
Solar, storage, roofing,
EV charging, or service.