EnergyTools

Solar Cost Per Watt in Hawaii

Average $$4.20/W • Rank #$51 of 51 • 17.2-year payback • Updated 2026

Urgent tax credit deadlines

  • Section 30D EV credit (up to $7,500) — expires June 30, 2026 (12 days left).
  • Section 48E solar ITC safe harbor — construction must start by July 4, 2026 (16 days left).
See the full deadline tracker

Cost Per Watt

$4.20

avg in Hawaii

vs National

+$1.13

(+36.8%)

Payback (8kW)

17.2 yrs

avg

Sun Hours/Day

6

peak

Comparing installer quotes in Hawaii?

Use our free Quote Comparison Tool — normalizes cost per watt, verifies production with NREL, and flags misleading quotes.

Compare Quotes →

Cost Per Watt by System Size in Hawaii

Cost per watt typically decreases for larger systems (economies of scale).

$4.62
4kW
$4.41
5kW
$4.28
6kW
$4.20
7kW
$4.12
8kW
$3.99
10kW
$3.86
15kW

Bars show Hawaii's $/W for each system size. Lower = better value.

System Size Cost Per Watt Total Cost vs National Avg
4 kW $4.62/W $16,800 +$1.55
5 kW $4.41/W $21,000 +$1.34
6 kW $4.28/W $25,200 +$1.21
7 kW $4.20/W $29,400 +$1.13
8 kW $4.12/W $33,600 +$1.05
10 kW $3.99/W $42,000 +$0.92
15 kW $3.86/W $63,000 +$0.79

Solar Cost Overview for Hawaii

In Hawaii, the average installed cost for residential solar is $4.20 per watt, with typical systems ranging from $4.20/W to $4.20/W depending on the installer, equipment quality, and roof complexity. Hawaii ranks #51 out of 51 states (1 = cheapest) for solar affordability — 50 states have cheaper solar.

Hawaii is a premium market — careful quote comparison is essential.

What's Driving Hawaii's Solar Costs?

Hawaii's $$4.20/W average reflects a combination of premium market equipment costs, below-average local utility rates ($0.130/kWh vs national avg $0.1490/kWh), and above-average solar resource (6 sun hours/day vs national avg 4.7).

Note on panel pricing: Prices shown reflect AVL/DomCon-compliant panels that qualify for IRA bonus credits. Non-compliant panels (Mission, JA, Canadian) are available from $0.37/W panel-only but do NOT qualify for the 30% federal tax credit or IRA bonus credits. Learn about panel compliance costs →

Hawaii Solar Incentives & Policies

Net Metering

Reduced-rate net billing

State Tax Credit

Available

Property Tax Exemption

Yes

Sales Tax Exemption

No

⚠ 2026 Federal ITC Update

The Section 25D residential solar tax credit (30%) expired December 31, 2025. Owned residential systems installed in 2026 no longer qualify. The 48E ITC (30%) remains available for lease/PPA, commercial, and rental properties that begin construction before July 4, 2026.

States With Similar Solar Costs

State Avg $/W vs Hawaii Payback Sun Hours
Hawaii (you) $4.20 — 17.2 yrs 6
Alaska $3.80 $-0.40 15.7 yrs 3.5
California $3.80 $-0.40 18.1 yrs 5
Massachusetts $3.70 $-0.50 16.1 yrs 4.3
Connecticut $3.60 $-0.60 16.7 yrs 4.4
New York $3.60 $-0.60 17.4 yrs 4.4
View all 50 states →

Hawaii Solar Cost FAQs

How much do solar panels cost in Hawaii?
A typical 8kW residential solar system in Hawaii costs approximately $33,600 before incentives, at an average of $4.20 per watt. Smaller 5kW systems start around $21,000, while larger 10kW systems can reach $42,000. The exact price depends on equipment quality, installer, roof complexity, and local permitting costs.
Is Hawaii a cheap or expensive state for solar?
Hawaii's average cost of $4.20/W is $1.13 above the national average of $3.07/W. Hawaii ranks #51 out of 51 (1 = cheapest) for solar affordability. Hawaii is a premium market — careful quote comparison is essential.
What is the payback period for solar in Hawaii?
The average solar payback period in Hawaii is 17.2 years for an 8kW system costing $33,600 and generating approximately 15,067 kWh per year. With Hawaii's average utility rate of $0.130/kWh, you'd save about $1,959 per year. After the 17.2-year payback period, the system continues producing electricity for 15+ more years.
Does Hawaii have net metering?
Hawaii offers reduced-rate net billing — excess solar production is credited at a lower rate (often the wholesale rate or avoided cost). This means exported solar is worth less than grid power you import.
What solar incentives are available in Hawaii?
Hawaii offers a state solar tax credit, exempts solar from property tax assessments, and does not exempt solar equipment from sales tax. The federal Section 25D residential solar tax credit (30%) expired December 31, 2025 — it no longer applies to 2026 installations on owned primary residences. The Section 48E ITC (30%) remains available for lease/PPA, commercial, and rental properties that begin construction before July 4, 2026.
How many peak sun hours does Hawaii get?
Hawaii receives an average of 6 peak sun hours per day, which is above the national average of 4.7. Peak sun hours directly affect solar production — a 8kW system in Hawaii produces approximately 15,067 kWh per year.

Related Tools

Quote Comparison Tool

Compare Hawaii installer quotes side-by-side.

Solar ROI Calculator

Estimate Hawaii payback and savings.

Incentive Finder

Hawaii rebates & tax credits.

Hawaii Solar Payback

Detailed payback analysis by system size.

Hawaii cost-per-watt data based on 3 ZIP code samples. Production estimates use NREL PVWatts V8 (azimuth 180°, tilt 30°, array_type 1, module_type 1, losses 14%). Utility rate averages from NREL Utility Rate API V3. The federal Section 25D residential solar tax credit expired December 31, 2025.