No phone number required. We never sell your information to solar installers.Privacy
SolarLinkup

Updated / MA residential estimate

Massachusetts solar panel cost calculator

Estimate system size, panel count, gross cost, annual production, and savings using defaults for Massachusetts. Enter an address or ZIP Code below to replace them with live location data.

High retail rates can make solar economics compelling despite lower sun hours; roof age, snow, and local incentive eligibility matter.

Loading calculator...

State data baseline

Planning sun hours
3.9 hours/dayState planning default used when API data is unavailable.
PVWatts annual yield
1,210 kWhPer 1 kW system at 20% loss. Solar resource: 4.70 kWh/m²/day; 13.8% capacity factor.
EIA residential rate
$0.2961/kWhLatest state average: 2026-06.
API baseline location
Boston, MA 02108, USA42.3549, -71.0661
Location APIGoogle Geocoding API
Electricity APIEIA Open Data API v2
Production APINLR PVWatts v8

Server-side API snapshot, refreshed monthly. All three providers returned external data.Data sources and update notes

Decision brief

What changes the decision in Massachusetts

These state-specific checks are not included in a generic national quote. Resolve them before comparing payback claims. Supporting rules and official references are collected at the end of this page.

  1. 01Before you sign

    Check SMART 3.0 capacity and qualification

    The 2026 small-system rate is program-specific and capacity-limited. Ask for the qualification path and show the incentive separately from bill savings.

  2. 02Before you sign

    Apply the 20-year property exemption conditions

    Clause Forty-fifth contains capacity, annual-needs, documentation, and municipal provisions. Confirm treatment with the local assessor.

  3. 03Before you sign

    Model snow and high retail rates independently

    High electricity prices can improve self-consumption value, while snow and winter irradiance affect production. Do not let one offset the other without monthly evidence.

Verified state policy

What can reduce your cost in Massachusetts

Review these 4 statewide or utility-level policy signals before comparing net cost. They are not automatically applied because eligibility, tax liability, utility territory, equipment, and program capacity can change.

Policy configuration verified .

Policy sources
Generally available01
Residential renewable energy credit

15% up to $1,000

The Massachusetts personal income-tax credit is 15% of net qualifying expenditure or $1,000, whichever is less.

Generally available02
Residential renewable equipment sales-tax exemption

100% of the 6.25% state tax

Qualifying equipment used to supply the energy needs of a principal residence is exempt from Massachusetts sales tax.

Eligibility applies03
Solar property-tax exemption

100% for 20 years

Qualifying systems at or below 25 kW, or within the statutory annual-needs condition, receive a 20-year exemption unless a qualifying municipal agreement applies.

Eligibility applies04
SMART 3.0 small-system incentive

$0.03/kWh for 2026

The 2026 flat incentive applies to qualifying tariff generation units at or below 25 kW AC. Program capacity, utility territory, adders, and qualification rules apply.

Calculation walkthrough

How we calculate for Massachusetts

A worked example using this page's baseline assumptions. Calculator results above change when you edit the inputs.

Baseline inputs

Illustrative 1,000 kWh/month household

Solar resource
4.144 peak sun hours/day
Modeled system loss
20% loss / 80% delivered
Household electricity use
12,000 kWh/year
Energy value
$0.2961 retail / $0.07 export
  1. 01

    Annual output per 1 kW

    Location and production losses

    4.144 h/day × 365 days × 80% delivered

    1,210 kWh/year

  2. 02

    Required system capacity

    Annual demand divided by output

    12,000 kWh ÷ 1,210 kWh per kW

    9.92 kW

  3. 03

    Energy-based panel count

    Rounded up; entered usable roof area can cap the result

    9.92 kW ÷ 0.4 kW per panel → round up

    25 panels

    10 kW

  4. 04

    Estimated first-year value

    Retail offset plus export credit

    12,000 kWh × $0.2961 + 100 kWh × $0.07

    $3,560/year

Model notes and limitationsSources and scope

Production baseline

NLR PVWatts v8 modeled a 1 kW array at 20° tilt and 180° azimuth for Boston, MA 02108, USA.

Energy valuation

Self-consumed production offsets the retail rate. Production above annual use is valued at the configured export rate; utility tariffs may use different timing or settlement rules.

Not included

Roof shading, structural conditions, hourly tariffs, financing, maintenance, incentives, and tax eligibility require separate verification.

Massachusetts FAQ

Data updated: 2026-08-11. API baseline: Google Geocoding API, EIA Open Data API v2, and NLR PVWatts v8. Policy assumptions should be verified before purchase using the sources below.

Sources & verification

Review the original API, statute, regulator, or program documentation before relying on an estimate for a purchase, tax filing, or contract.

Data sources

Geocoding, residential electricity rates, and solar production inputs.

3 sources · Updated 2026-08-11

State rules

Official references behind the state-specific decision checks.

3 primary references

Incentives

Tax, rebate, and compensation sources used for policy summaries.

4 policy sources · Reviewed Aug 11, 2026