A 1,800 square foot home in Arizona typically uses about 809 kWh per month at the state average rate of 13.2¢/kWh (EIA). With 6.5 peak sun hours per day, most homeowners need a 5.0 kW solar system — roughly 13 panels at 400W. After the 30% federal ITC, net cost is about $10,500, with 9.4-year payback and $36,200+ in estimated 25-year savings.
Content roles: This page is your Arizona-specific sizing decision for 1,800 sq ft. For national methodology and roof/orientation depth, see the 1,800 sq ft national guide. For bill-based sizing, see $125/month (~$107/mo equivalent in Arizona). Policy depth: Arizona solar data.
⚡ System Size
How Many Solar Panels for a 1,800 sq ft House in Arizona?
Arizona electricity rates and sun hours change panel count versus the US average:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For 1,800 sq ft in Arizona:
Estimated monthly usage: ~809 kWh
Peak sun hours: 6.5 h/day
System size:5.0 kW (~13 × 400W panels)
Metric
Arizona
US average
Rate
13.2¢/kWh
16.3¢/kWh
Sun hours
6.5 h/day
4.5 h/day
System size
5.0 kW
7.2 kW
Panels (400W)
13
19
Arizona requires a smaller system than the national average for the same square footage. Use our solar system size calculator with your actual utility bills for a precise ZIP-level result.
Find your exact solar savings
Enter your ZIP code for a personalized estimate using your state's electricity rate and sun hours.
💰 System Cost
What Does Solar Cost for a 1,800 sq ft Home in Arizona After the ITC?
At $3.00/W installed (SEIA 2026), a 5.0 kW system in Arizona costs about $15,000 before incentives. The 30% ITC saves ~$4,500, for $10,500 net cost.
📈 Payback Period
How Long Is Solar Payback on a 1,800 sq ft Home in Arizona?
A 5.0 kW system saving ~$1,115/year pays back in about 9.4 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$46,700 vs $10,500 net solar — $36,200+ lifetime advantage.
Solar vs utility company · 25-year comparison
Total cost of staying on the grid vs owning solar for a $300/month bill (national average assumptions).
Arizona offers a 25% Residential Solar Energy Tax Credit (up to $1,000) on state income taxes. Arizona also exempts solar systems from the state sales tax and from property tax assessments, making it one of the most incentive-friendly states for solar.
At Arizona's average rate of 13.2¢/kWh and 6.5 peak sun hours, a 1,800 sq ft home (~809 kWh/month) typically needs a 5.0 kW system — about 13 panels at 400W. See the [national 1,800 sq ft guide](/guides/how-many-solar-panels-1800-sq-ft/) for methodology.
A 5.0 kW system in Arizona costs roughly $15,000 installed before incentives. The 30% federal ITC reduces net cost to about $10,500. Arizona offers a 25% Residential Solar Energy Tax Credit (up to $1,000) on state income taxes. Arizona also exempts solar systems from the state sales tax and from property tax assessments, making it one of the most i...
At $10,500 net cost and ~$1,115/year in bill savings, simple payback in Arizona is about 9.4 years.
Most Arizona homeowners in this size range see **$36,200+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$107** — compare the [$125/month bill guide](/guides/solar-panels-125-electric-bill/) for bill-based sizing.
The US average needs a 7.2 kW system at 11.0-year payback. Arizona needs 5.0 kW with 9.4-year payback at 13.2¢/kWh and 6.5 sun hours.
$125/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.