Solar Panels in Kapa'a, HI: Cost, Payback & Savings
A typical 4.0 kW home solar system in Kapa'a costs about $14,400 and pays for itself in about 10.7 years, saving roughly $24,582 over 25 years at Hawaii's average electricity price of 46.3¢/kWh. Power you send back to the grid earns only about 2.0¢/kWh here, which is built into these numbers.
Monthly solar production in Kapa'a
Estimated output of a 4.0 kW south-facing roof system. Aug is the strongest month (603 kWh); Feb the weakest (418 kWh).
Solar production (kWh) Typical home use, 495 kWh/month
Solar payback calculator for Kapa'a
Pre-filled with Kapa'a's sunshine and Hawaii's average electricity price. Enter your own bill and an installer's price per watt to see your payback.
Leave export credit blank where the utility offers full net metering. Where exports earn less, solar used at home as it's produced is worth the full price and the rest earns the export credit.
How Kapa'a compares
- Each kW of panels here produces about 1,546 kWh a year — about the same as the Hawaii median and 13% more than the US median city (1,371 kWh).
- Payback ranks #35 of 62 Hawaii places we cover.
- Sunshine varies little across a state; electricity price, installed cost and how utilities credit exported power drive most of the difference between states.
Net metering, tax credits and incentives in 2026
Hawaii pays less than retail for exported solar power. Under Smart Export, power you send to the grid earns about 2.0¢/kWh, against 46.3¢ for power you buy. We assume 40% of a no-battery system's output is used at home as it's produced (worth the full price) and the rest is exported, so each solar kWh is worth about 19.7¢. Using more of your solar yourself, by running appliances midday or adding a battery, raises that.
Hawaiian Electric's Smart Export pays for exports only between 4 p.m. and 9 a.m. (about 15¢ on O'ahu) and nothing from 9 a.m. to 4 p.m., when panels export most. Nearly all new Hawaii systems include a battery; without one, exports are worth little. Source.
There is no federal tax credit for buying home solar installed in 2026. The 30% Residential Clean Energy Credit (Section 25D) ended for systems placed in service after December 31, 2025, so the costs and paybacks on this page include no federal credit.
Hawaii and local utilities may still offer rebates, performance payments, property-tax or sales-tax exemptions. Search the DSIRE incentives database for Hawaii and ask installers which programs they apply for you.
Frequently asked questions
Is solar worth it in Kapa'a, HI?
For a typical home, a solar system pays for itself in about 10.7 years and then keeps saving money. Over 25 years the estimated net savings are $24,582. Verdict: solid long-term investment. Your own payback depends on your roof, your bill and the quotes you get.
How many solar panels do I need in Kapa'a, HI?
A home using 495 kWh a month (the Hawaii average) needs about 10 panels of 400 W — a 4.0 kW system — to cover its annual use. Divide your own yearly kWh by 1,546 to get the kW you need.
How much do solar panels cost in Kapa'a, HI?
At 3.60 dollars per watt, a 4.0 kW system costs about $14,400 before any state or utility incentives. There is no federal tax credit for systems installed in 2026.
How much sun does Kapa'a get?
Kapa'a averages 5.6 peak sun hours per day, so each kilowatt of panels produces about 1,546 kWh a year.
Does Hawaii have net metering?
Not full retail net metering. Under Smart Export, exported solar power earns about 2.0¢ per kWh, versus 46.3¢ for power bought from the grid. Solar you use at home as it's produced still saves the full price.
How much does electricity cost in Hawaii?
Residential electricity in Hawaii averages 46.3¢ per kWh, and a typical home uses 495 kWh a month (EIA).
Solar payback in nearby places
- Makaha-Ka'ena11.0 yrs
- Waianae10.5 yrs
- Ma'ili10.3 yrs
- Nanakuli10.7 yrs
- Schofield Barracks11.0 yrs
- Schofield-Wheeler11.0 yrs
- Wahiawa-Whitmore10.9 yrs
- Wahiawa10.9 yrs