Hawaii Solar Panel Cost: Savings and Payback (October 2025)

You'll spend an average of $14,840 on a 5 kW system in Hawaii, after tax incentives.
For Hawaii, you can use $4.22 per watt to determine the price of a larger system (system size x price per watt x 0.7 to account for tax incentives).

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Brogan Woodburn

Last updated: October 8, 2025

Fact checked by: Alex Zdanov

What to know

Cost: About $2,968 for a 1 kW system to $14,840 for a 5 kW system after tax credit.
Savings: 6 year payback; about $33,966 saved over 20 years.
Environmental benefits: Potential to reduce your carbon emissions significantly.

Going solar in Hawaii now averages about $4.22 per watt. That means you can expect to pay roughly $4,216 per kilowatt (kW) of installed capacity before incentives. For example, a 5 kW system typically costs around $21,200 before applying the 30% federal tax credit. Once you factor in that tax credit, the out-of-pocket cost for a 5 kW installation comes to about $14,840

However, a 5 kW system isn't necessarily the best size for homeowners in Hawaii. According to our data, Hawaii residents currently pay an average of 42.49¢ per kWh, with a typical electric bill of around $203.36 per month for 479 kWh of consumption. Considering this energy usage, a 4 kW system is ideal to cover the energy needs of most.

How long does it take to see a return on your investment in Hawaii?

The upfront cost is what you pay for a system (whether you pay cash or finance doesn't factor in this equation). The payback period is the amount of time until you break even on your investment considering savings from energy bills. And the net 20-year savings is what you save over 20 years minus the upfront costs. All of these work together to show how much you could save with solar in the state.

5 kWh System	Hawaii Average	U.S. Average
Upfront Cost	$14,840	$12,530
Payback period	6 Years	7 Years
Net 20-year savings	$33,966	$22,797
*These are estimates. Getting personalized quotes from local installers is crucial for accurate pricing.

Federal tax credit impact: The 30% federal Residential Clean Energy Credit significantly reduces your installation costs. For example, a $20,000 system would cost you $14,000 after the credit.

Is Hawaii good for home solar panels?

To gauge potential, we look at average roof size, system capacity, and electrical production.

Roof size: 1,161.875 sq. ft.
System capacity: Up to 24,073.277 kW DC
Electricity production: About 1,488.352 kWh AC per year

On average, a solar power system in Hawaii can lower your electricity bill and pay for itself over time.

Below you can see power generation, cost, and savings of different system sizes.

	1 kW System	2 kW System	3 kW System	4 kW System	5 kW System
Roof Space	72 ft²	143 ft²	215 ft²	286 ft²	358 ft²
Annual power value	$632	$1,265	$1,897	$2,440	$2,440
Average cost	$2,968	$5,936	$8,904	$11,872	$14,840
Average yearly production	1,488 kWh	2,976 kWh	4,465 kWh	5,953 kWh	7,441 kWh
Average monthly savings*	$52.71	$105.41	$158.12	$203.36 best value	$203.36
Full payback period	1 years	2 years	4 years	5 years	6 years
CO₂ reduction per year	1.08 tons	2.16 tons	3.24 tons	4.16 tons	4.16 tons
*Savings assume a $203.36 monthly electricity bill

How to pay for solar panels in Hawaii

Purchasing solar panels is no small task. Here are a few ways you can pay for solar:

Cash purchase: This is the best choice if you can afford it. Paying in cash gives you the best long-term savings but requires a larger upfront investment, of course.
Solar loans: You can spread the cost over time with a loan, but be mindful of interest rates and loan terms.
Solar leases and PPAs: Power purchase agreements (PPA) and leases have lower upfront costs. However, you don't own the system, which means you save the least over time. There can also be complications if you want to sell your home.

What affects the cost of solar panels in Hawaii?

Several factors impact the final price of your solar installation:

System size: Larger systems cost more upfront but often yield greater long-term savings.
Panel type and efficiency: Monocrystalline panels are generally more efficient and expensive than polycrystalline or thin-film options.
Installation complexity: Roof type, shading, and site-specific challenges can increase installation costs. Permitting and inspection fees also factor in.
Additional considerations: Battery storage adds to the initial investment but provides backup power and greater energy independence. Labor and installation quality are also essential cost considerations.

How to save on Hawaii solar panel costs

Getting the most bang for your buck is essential when investing in solar. Here are some strategies to save money:

Maximize the federal tax credit: Understand the eligibility requirements and claim the full 30% credit.
Shop around for quotes: Get quotes from multiple installers to compare pricing and services. Don't just focus on the lowest price; consider reputation, experience, and warranty.
Consider system size: Be careful of going overboard. A properly sized system will meet your energy needs without unnecessary costs. Analyze your energy usage to determine the optimal size.
Explore financing options: Compare loan interest rates and terms carefully. If considering a lease or PPA, understand the long-term implications and potential trade-offs. Cash purchases often offer the best long-term savings.
Negotiate with installers: Don't be afraid to negotiate on price. Inquire about any discounts or promotions they may offer.
Optimize your home's energy efficiency: Before going solar, improve your home's energy efficiency. This will reduce your overall energy consumption and potentially allow you to install a smaller, less expensive solar system. Simple steps like sealing air leaks and upgrading appliances can make a difference.
DIY (if possible and permitted): While professional installation is generally recommended, some homeowners may be able to handle certain tasks themselves (like site preparation). Check your local regulations and be honest about your abilities.
Ask about rebates and incentives: Many states, cities, and utility companies offer rebates, net metering, and other incentives. Check with your local utility and city/county for any available programs.
Time your installation: Sometimes, installers offer discounts during slower periods. Inquiring about seasonal promotions might yield savings.

Hawaii-specific solar considerations

Weather Impacts: Hawaii offers a steady supply of sunshine, making it ideal for solar energy. That said, the islands have their own unique challenges—think tropical storms, salty air, and even volcanic activity—which means you'll want corrosion-resistant, robust systems.
Regulatory and Legal Considerations: Permitting in Hawaii can be unique, with some island-specific regulations in place. While there are state incentives to help with costs, be sure to follow local zoning and HOA rules closely to keep everything in check.

Solar panel prices in other states vs Hawaii

Solar panel prices in Hawaii's biggest cities

Get a custom solar quote in Hawaii

Going solar in Hawaii can be a financially and environmentally sound decision. By understanding how much it costs and how much you can save, you can make an informed investment and enjoy using clean energy for years to come. Get multiple quotes from reputable installers, compare your options, and take control of your energy.