US residential solar · 2026 data

1,500 sq ft Home — Solar Guide for All 50 States

Q: "How many solar panels does a 1,500 sq ft house need?"

"Nationally, a 1,500 sq ft home (~674 kWh/month) needs about **16 panels** (6.0 kW) at average US rates and sun hours. State totals range from **11** in Arizona to **22** in Alaska."

Q: "Which state has the fastest solar payback for 1,500 sq ft?"

"**Hawaii** leads at **3.3-year** payback (4.5 kW, $9,500 after ITC). **Washington** is slowest at **18.7 years**."

Q: "What does solar cost for a 1,500 sq ft home after the 30% tax credit?"

"US average net cost is **$12,600** for a **6.0 kW** system ($18,000 gross). State costs range from **$9,500** (Hawaii) to **$18,300** (Alaska)."

Q: "Is a 1,500 sq ft sizing guide different from a monthly bill guide?"

"Yes — same end goal, different starting point. 1,500 sq ft maps to roughly **$100/month** nationally. Use this hub for **home size**; use the [$100/month bill hub](/guides/solar-panels-100-month-bill-by-state/) if you know your utility bill."

Q: "Where can I read the full national 1,500 sq ft methodology?"

"See the [national 1,500 sq ft guide](/guides/how-much-do-solar-panels-cost-1500-sq-ft-home/) for roof orientation, panel wattage, and calculator walkthrough. Each state link below adds **local rate \u0026 sun hours**."

SAVE

$0+

Over 25 Years

$12,600 Cost after ITC

11.0 yrs Payback

6.0 kW Typical system

Most homeowners need:

14–19 panels nationally
6.0 kW average system
$12,600 after tax credits
11.0 year national payback

✓ Updated monthly ✓ NREL data ✓ Reviewed by solar experts ✓ IRS tax credit included

Updated June 9, 2026 · 3 min read ·By Mark Sullivan ·Reviewed by Green Energy Calculators Editorial Team

Calculate System Size National 1,500 sq ft Guide

Without solar vs with solar

25-year cost comparison for a $300/month US electric bill.

Without solar

25-year utility cost

$48,100

Rates rise ~3% per year (EIA avg.)

With solar

Net system cost

$12,600

After 30% federal ITC

Your savings

Difference

+$35,500

Estimated lifetime advantage

Author Mark Sullivan

Reviewed by Green Energy Calculators Editorial Team

Last updated Jun 9, 2026

Sizing formula kW = Annual kWh ÷ (Peak Sun Hours × 365 × 0.82)

A 1,500 square foot home in the US typically needs 16 solar panels (6.0 kW) at national average electricity rates and sun hours — $12,600 after the 30% ITC with 11.0-year payback. State-by-state, system size ranges from 4.2 kW in Arizona to 8.7 kW in Alaska, and payback spans 3.3–18.7 years.

Start here: National 1,500 sq ft guide · System size calculator · $100/month bill by state

National Snapshot: 1,500 sq ft Solar in 2026

Metric	US average (1,500 sq ft)
Est. monthly usage	~674 kWh
System size	6.0 kW
Panels (400W)	16
Net cost after ITC	$12,600
Simple payback	11.0 years
25-year savings	$35,500+

Formula: kW = Annual kWh ÷ (Peak sun hours × 365 × 0.82)

Fastest & Slowest Payback States for 1,500 sq ft Homes

	Fastest payback	Slowest payback
State	Hawaii	Washington
System	4.5 kW · 12 panels	6.8 kW · 17 panels
After ITC	$9,500	$14,200
Payback	3.3 yrs	18.7 yrs

High electricity rates (e.g. Hawaii, California, Massachusetts) often beat sunny low-rate states for 1,500 sq ft payback.

1,500 sq ft Home — Solar by State (2026)

State	System	Panels	After ITC	Payback
Alabama	5.1 kW	13	$10,700	11.4 yrs
Alaska	8.7 kW	22	$18,300	11.1 yrs
Arizona	4.2 kW	11	$8,700	9.4 yrs
Arkansas	5.4 kW	14	$11,400	13.6 yrs
California	4.7 kW	12	$9,800	4.7 yrs
Colorado	4.9 kW	13	$10,300	10.3 yrs
Connecticut	6.4 kW	17	$13,500	7.7 yrs
Delaware	6.0 kW	16	$12,600	12.1 yrs
Florida	4.7 kW	12	$10,000	10.5 yrs
Georgia	5.2 kW	13	$10,900	11.9 yrs
Hawaii	4.5 kW	12	$9,500	3.3 yrs
Idaho	5.4 kW	14	$11,400	14.7 yrs
Illinois	6.1 kW	16	$12,900	11.7 yrs
Indiana	6.0 kW	16	$12,600	12.8 yrs
Iowa	6.0 kW	16	$12,600	15.1 yrs
Kansas	5.4 kW	14	$11,400	12.2 yrs
Kentucky	5.9 kW	15	$12,300	15.4 yrs
Louisiana	5.0 kW	13	$10,500	13.1 yrs
Maine	6.3 kW	16	$13,200	8.5 yrs
Maryland	6.0 kW	16	$12,600	11.8 yrs
Massachusetts	6.4 kW	17	$13,500	7.8 yrs
Michigan	6.6 kW	17	$13,800	11.1 yrs
Minnesota	6.0 kW	16	$12,600	12.1 yrs
Mississippi	5.2 kW	13	$10,900	12.7 yrs
Missouri	5.6 kW	15	$11,800	13.2 yrs
Montana	5.6 kW	15	$11,800	13.4 yrs
Nebraska	5.6 kW	15	$11,800	14.7 yrs
Nevada	4.2 kW	11	$8,900	8.8 yrs
New Hampshire	6.4 kW	17	$13,500	8.8 yrs
New Jersey	6.1 kW	16	$12,900	10.4 yrs
New Mexico	4.4 kW	11	$9,200	9.0 yrs
New York	6.3 kW	16	$13,200	8.4 yrs
North Carolina	5.2 kW	13	$10,900	12.1 yrs
North Dakota	6.0 kW	16	$12,600	16.4 yrs
Ohio	6.3 kW	16	$13,200	12.8 yrs
Oklahoma	5.1 kW	13	$10,700	13.2 yrs
Oregon	6.0 kW	16	$12,600	14.2 yrs
Pennsylvania	6.4 kW	17	$13,500	11.4 yrs
Rhode Island	6.3 kW	16	$13,200	7.6 yrs
South Carolina	5.1 kW	13	$10,700	11.3 yrs
South Dakota	5.6 kW	15	$11,800	14.1 yrs
Tennessee	5.4 kW	14	$11,400	13.2 yrs
Texas	4.8 kW	13	$10,100	10.4 yrs
Utah	4.7 kW	12	$9,800	12.4 yrs
Vermont	6.6 kW	17	$13,800	9.6 yrs
Virginia	5.8 kW	15	$12,100	12.3 yrs
Washington	6.8 kW	17	$14,200	18.7 yrs
West Virginia	6.4 kW	17	$13,500	15.5 yrs
Wisconsin	6.3 kW	16	$13,200	11.0 yrs
Wyoming	5.4 kW	14	$11,400	14.0 yrs

Estimates use EIA state rates, NREL sun hours, and typical kWh/sqft intensity. National methodology.

How Sq Ft Sizing Compares to Monthly Bill Guides

1,500 sq ft maps to roughly $110/month in utility spend nationally — close to our $100/month bill tier.

Sizing method	Best when you know…	National guide
Sq ft (this page)	Home size	1,500 sq ft
Monthly bill	Utility bill amount	$100/mo

Use both: if your actual bill differs from the sq ft estimate, trust your kWh usage from the utility statement.

Frequently asked questions

Direct answers for US homeowners — sized for a 1,500 sq ft home.

How many solar panels does a 1,500 sq ft house need?

Nationally, a 1,500 sq ft home (~674 kWh/month) needs about **16 panels** (6.0 kW) at average US rates and sun hours. State totals range from **11** in Arizona to **22** in Alaska.

Which state has the fastest solar payback for 1,500 sq ft?

What does solar cost for a 1,500 sq ft home after the 30% tax credit?

Is a 1,500 sq ft sizing guide different from a monthly bill guide?

Where can I read the full national 1,500 sq ft methodology?

$100/month electric bill by state

System size and payback vary by electricity rate and sun hours — see your state.

CA California $100/mo · 29.4¢/kWh TX Texas $100/mo · 13.8¢/kWh FL Florida $100/mo · 13.5¢/kWh AZ Arizona $100/mo · 13.2¢/kWh NC North Carolina $100/mo · 12.8¢/kWh NY New York $100/mo · 22.4¢/kWh MA Massachusetts $100/mo · 24.5¢/kWh CO Colorado $100/mo · 14.2¢/kWh

Compare all 50 states for $100/mo →

Same usage, bill-based guide

Your target maps to roughly a $100/month electric bill nationally.

$100 $100/month electric bill guide Panels · cost · payback · by state →

Popular utility companies

Solar rules and net metering vary by utility — not just by state.

PG&E California Duke Energy NC · FL · Midwest Florida Power & Light Florida Oncor Texas APS Arizona Georgia Power Georgia

Methodology & data sources

Calculation method: System size uses NREL PVWatts derate factor (0.82). Costs based on SEIA 2026 installed cost ($2.75–$3.20/W). Payback uses net cost after 30% federal ITC (IRC Section 25D). Savings assume full-retail net metering unless noted.

Official sources: EIA state electricity rates · NREL PVWatts · Energy.gov ITC guide · DSIRE incentives · SEIA market data · IRS Publication 5695.

All figures are estimates for educational purposes — not tax, legal, or investment advice. Consult a licensed installer and CPA for your situation.