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How to go solar

Solar pricing lives at the watt, not the project. Most of what moves a quote up or down comes from three things: the equipment tier (panels, inverter, racking), the roof and electrical work the install actually requires, and how the system is financed. With the 30% federal credit gone for purchased systems as of 2026, the financing decision matters more than it ever has.

NABCEP PV Installation Professional — Lead designer and field crew hold NABCEP PV Installation Professional certification — the industry credential, and a prerequisite for Rhode Island's Renewable Energy Professional (REP) license.
Licensed electricians on every install — Final AC tie-in is performed by an RI Class A or MA Master electrician. License number appears on every quote, permit, and inspection card.
Spec sheets with every proposal — Every proposal names the exact panel model, inverter, racking, attachment, and (if quoted) battery — with manufacturer spec sheets attached. No "premium-tier panels" placeholder language.
Production modeled, not promised — Year-one kWh estimate runs through NREL PVWatts or Aurora with your actual roof, azimuth, tilt, and shade — and we show you the model output, not just a single number.
Get a quoteWhat it usually costs
$2.75–4.00/Wper watt installed

A typical 8 kW residential system in RI/MA runs $22,000–32,000 installed before any incentives. Mid-tier panels with a string inverter sit near the bottom of the range; premium panels with microinverters and a battery sit near the top. Battery storage adds $8,500–17,000 depending on chemistry, capacity, and how many you stack.

The biggest swings come from equipment tier (premium vs. mid-tier panels, microinverter vs. string), whether your roof and main service panel need work before the array can go up, and whether storage is in scope. Financing structure also changes what you actually pay — see the FAQ on cash vs. loan vs. lease.

See what drives price

How we price it

These are the factors that move a quote up or down. Knowing them helps you share the right context upfront so we can quote your specific situation accurately — and so you can compare bids on apples-to-apples scope.

Equipment tier (panels + inverter)
Primary driver

Premium panels (Maxeon 7, REC Alpha Pure-R) deliver 22–24% efficiency, 25-year product warranties, and 0.25%/yr degradation — at roughly $0.50–0.80/W more installed than mid-tier (Q.Cells, JinkoSolar Tiger Neo, Trina Vertex) at 20–21% efficiency with 12–15 year product warranties and 0.40%/yr degradation. On the inverter side, Enphase IQ8 microinverters run $0.30–0.45/W more than a SolarEdge string-plus-optimizer setup, but every panel produces independently, the warranty is 25 years vs. 12, and there is no single point of failure. Worth talking through which trade-offs fit your roof and your timeline.

Benchmark:Mid-tier panel + string: ~$2.75–3.20/W · Mid-tier panel + microinverter: ~$3.10–3.60/W · Premium panel + microinverter: ~$3.60–4.00/W
Roof condition & complexity
Primary driver

An array is a 25-year mount on whatever roof is under it. If your shingles have less than 10 years of life left, you re-roof under the array now or pay to remove and reset the system later (a $2,500–5,000 job). Multi-plane roofs, dormers, hips, valleys, and tile or slate all add labor and attachment count. The number of attachments matters: each one is a flashing penetration, and a steeper or more complex roof can double the attachment count vs. a clean south-facing gable.

Benchmark:Re-roof under array (asphalt, typical 8 kW footprint): $4,500–9,000 · Remove + reset after the fact: $2,500–5,000 · Slate/tile penalty: +$0.30–0.60/W
Worth asking about: A proposal that does not mention roof age or condition. The installer should ask, look, and tell you if the roof needs to come first — not pencil-quote around it.
Main service panel & interconnection work
Primary driver

NEC 705.12 limits how much solar can backfeed a main panel based on the busbar rating and main breaker. A 100A panel almost always needs a service upgrade to 200A before a 7+ kW system can interconnect. Even on a 200A panel, options include a line-side tap, a backfed breaker (the "120% rule"), or a derated main — each with different cost and inspector preferences. A separate load calc (NEC 220) confirms the existing service can carry the new export plus any future EV charger or heat pump you have in mind.

Benchmark:100A → 200A service upgrade: $2,200–4,000 · Line-side tap (sometimes needed on 200A): $400–900 · Sub-panel for critical loads (battery backup): $1,200–2,200
Worth asking about: A 7+ kW system quoted on a 100A panel with no panel upgrade line item. Either the math does not work or it will fail the utility interconnection review and the cost shows up after contract.
Battery storage (if scoped)
Secondary

A Tesla Powerwall 3 (13.5 kWh, integrated solar inverter) runs roughly $15,000–17,000 installed in RI/MA and can start a 5-ton AC or a full-size heat pump on its own. An Enphase IQ Battery 5P (5 kWh modular) runs $8,500–10,500 for one, and you stack 2–3 for whole-home backup. Powerwall is generally lower $/kWh; Enphase scales in smaller increments and pairs natively with IQ8 microinverters. Mass Save's ConnectedSolutions program pays $225/kW-summer for letting the utility dispatch your battery (roughly $1,500–2,000/yr for a Powerwall). RI has no equivalent residential dispatch program in 2026.

Benchmark:Tesla Powerwall 3 (13.5 kWh): $15,000–17,000 installed · Enphase IQ 5P (5 kWh): $8,500–10,500 · Adder vs. solar-only: $1,000–1,300/kWh
State incentives & financing structure
Secondary

In MA, SMART 3.0 pays $0.03/kWh base for 10 years on systems under 25 kW, plus $0.04/kWh adder if you pair storage — payments arrive monthly via your utility bill. In RI, the REF cash grant pays $0.65/W up to $5,000 (one-time, application-based), plus a $2,000 battery adder when paired. The federal residential ITC (Section 25D) expired 12/31/2025 — if you buy a system in 2026 with cash or a loan, there is no federal credit. Leases and PPAs still qualify the installer for the Section 48 commercial credit, which is part of why lease pricing is competitive again post-2025.

Benchmark:MA SMART base: $0.03/kWh × 10 yr ≈ $3,500–4,500 for 8 kW · MA SMART + storage adder: ~$8,000–10,000 · RI REF: up to $5,000 + $2,000 battery adder
Permits, interconnection, and inspections
Situational

Municipal building/electrical permits run $150–500 across most RI and MA towns. Utility interconnection (RI Energy, Eversource, National Grid MA) is free for residential under 25 kW but adds 4–8 weeks of paperwork. Total contract-to-PTO timeline is typically 3–5 months — physical install is 1–3 days, the rest is permitting, inspections, and the utility witness test. These line items should appear on every proposal.

Benchmark:Building + electrical permits: $150–500 · Interconnection: $0 residential under 25 kW · Total contract → PTO: 12–20 weeks
Tree work & shading
Situational

Shading is a production killer — a single panel 20% shaded for 3 hours/day can cost the array 8–12% annual output on a string setup (less on microinverters or with optimizers). A good designer runs a shade analysis (Suneye, drone, or Aurora) and will tell you which trees are problems and what removal would buy you. Tree work is its own scope — figure $400–1,500 per mature tree, more if it is near power lines and needs a crane or utility coordination.

Benchmark:Tree removal (residential, 40–60 ft): $400–1,500 · Crane-assisted near utility lines: $1,500–3,500

What else might come up

Most projects touch more than one trade. Here's where this one usually overlaps with others — so you can plan ahead instead of scrambling.

Roofing
— When existing roof has less than ~10 years of life remaining, or has known leak history.

Re-roof under the array now and you pay for one set of labor. Wait and you pay for the array to come off, the roof to be redone, and the array to go back on — typically $2,500–5,000 plus the re-roof itself. Coordinating both trades is also a chance to install QuickMount or IronRidge base plates while the underlayment is open.

Electrician
— When the main service panel is 100A, has no breaker space, or is an obsolete brand (FPE Stab-Lok, Zinsco, ITE Pushmatic).

Panel upgrades, sub-panels for critical-load circuits (for battery backup), and EV-charger circuits are all electrical work that often pairs naturally with a solar install. If you are upgrading the service for solar, this is the moment to also pull a 240V circuit for an EV charger or future heat pump.

Tree service
— When the shade analysis shows specific trees costing 5%+ of annual production.

Tree removal is permanent — make sure you understand the production gain and have the homeowner conversation about the tree itself. A good designer will tell you exactly which trees matter and what removal would buy in annual kWh.

HVAC (heat pump)
— When the household plans to electrify heating in the next 3–5 years.

A heat pump roughly doubles your home's annual electric load. Sizing solar today for "current usage" leaves a system half-sized for tomorrow. If a heat pump is on the roadmap, size the array for the post-electrification load — and use the MA Mass Save heat pump rebates ($10,000+) and RI National Grid heat pump rebates while they are running.

EV charging
— When the household has or plans to buy an EV.

A Level 2 EV charger adds 2,500–4,000 kWh/yr of load. Same logic as the heat pump — size the array for the load you will have, not the load you have today. Most installers can pull the EV circuit at the same time as the solar install for $500–900 in additional labor.

What to send when you reach out
Send us:
  • Last 12 months of electric bills (kWh usage per month) — or your utility account number to authorize a release
  • Address and any known constraints (HOA, historic district, easements)
  • Roof age, material, and any known leak or repair history
  • Whether you own or rent (rentals are a different conversation)
  • How you expect to finance (cash, loan, lease, PPA) — this changes which equipment options are open to you
Helps a lot if you know it:
  • Photos of your main electrical panel (inside with breakers visible, and the outside meter)
  • Roof age and material; if you have invoices from the last re-roof, share them
  • Plans for an EV, heat pump, or any major electric load addition in the next 3–5 years
  • Battery interest and what loads matter most during an outage (whole-home vs. critical loads only)
  • Aerial photo of your roof if you have one — Google Earth screenshot is fine
Worth flagging if you see any of these — they shape the diagnosis:
  • Past roof leaks or active staining on attic decking
  • A federally-listed historic district or HOA solar restrictions
  • Knob-and-tube wiring, FPE/Zinsco/ITE Pushmatic panel, or aluminum branch wiring
  • Large trees within 30 feet of the south or southwest roof planes
  • Any pending or recent insurance non-renewal (carriers vary on solar-attached homes)
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