A 1,800 square foot home in Colorado typically uses about 809 kWh per month at the state average rate of 14.2¢/kWh (EIA). With 5.5 peak sun hours per day, most homeowners need a 5.9 kW solar system — roughly 15 panels at 400W. After the 30% federal ITC, net cost is about $12,400, with 10.3-year payback and $37,900+ in estimated 25-year savings.
Content roles: This page is your Colorado-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 (~$115/mo equivalent in Colorado). Policy depth: Colorado solar data.
⚡ System Size
How Many Solar Panels for a 1,800 sq ft House in Colorado?
Colorado 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 Colorado:
Estimated monthly usage: ~809 kWh
Peak sun hours: 5.5 h/day
System size:5.9 kW (~15 × 400W panels)
Metric
Colorado
US average
Rate
14.2¢/kWh
16.3¢/kWh
Sun hours
5.5 h/day
4.5 h/day
System size
5.9 kW
7.2 kW
Panels (400W)
15
19
Colorado 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 Colorado After the ITC?
At $3.00/W installed (SEIA 2026), a 5.9 kW system in Colorado costs about $17,700 before incentives. The 30% ITC saves ~$5,310, for $12,400 net cost.
📈 Payback Period
How Long Is Solar Payback on a 1,800 sq ft Home in Colorado?
A 5.9 kW system saving ~$1,199/year pays back in about 10.3 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$50,300 vs $12,400 net solar — $37,900+ 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).
Colorado’s Xcel Energy Solar Rewards Program pays cash for excess energy produced by qualifying solar systems. Additional incentives are available through Black Hills Energy and other Colorado utilities. Colorado also offers a $5,000 state EV tax credit that can be combined with solar+EV setups.
At Colorado's average rate of 14.2¢/kWh and 5.5 peak sun hours, a 1,800 sq ft home (~809 kWh/month) typically needs a 5.9 kW system — about 15 panels at 400W. See the [national 1,800 sq ft guide](/guides/how-many-solar-panels-1800-sq-ft/) for methodology.
A 5.9 kW system in Colorado costs roughly $17,700 installed before incentives. The 30% federal ITC reduces net cost to about $12,400. Colorado's Xcel Energy Solar Rewards Program pays cash for excess energy produced by qualifying solar systems. Additional incentives are available through Black Hills Energy and other Colorado utilities. Colorado also...
At $12,400 net cost and ~$1,199/year in bill savings, simple payback in Colorado is about 10.3 years.
Most Colorado homeowners in this size range see **$37,900+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$115** — 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. Colorado needs 5.9 kW with 10.3-year payback at 14.2¢/kWh and 5.5 sun hours.
$125/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.