A 3,500 square foot home in Kentucky typically uses about 1,691 kWh per month at the state average rate of 11.4¢/kWh (EIA). With 4.6 peak sun hours per day, most homeowners need a 14.7 kW solar system — roughly 37 panels at 400W. After the 30% federal ITC, net cost is about $31,000, with 15.4-year payback and $53,400+ in estimated 25-year savings.
Content roles: This page is your Kentucky-specific sizing decision for 3,500 sq ft. For national methodology and roof/orientation depth, see the 3,500 sq ft national guide. For bill-based sizing, see $300/month (~$193/mo equivalent in Kentucky). Policy depth: Kentucky solar data.
⚡ System Size
How Many Solar Panels for a 3,500 sq ft House in Kentucky?
Kentucky electricity rates and sun hours change panel count versus the US average:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For 3,500 sq ft in Kentucky:
Estimated monthly usage: ~1,691 kWh
Peak sun hours: 4.6 h/day
System size:14.7 kW (~37 × 400W panels)
Metric
Kentucky
US average
Rate
11.4¢/kWh
16.3¢/kWh
Sun hours
4.6 h/day
4.5 h/day
System size
14.7 kW
15.1 kW
Panels (400W)
37
38
Kentucky 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 3,500 sq ft Home in Kentucky After the ITC?
At $3.00/W installed (SEIA 2026), a 14.7 kW system in Kentucky costs about $44,200 before incentives. The 30% ITC saves ~$13,260, for $31,000 net cost.
📈 Payback Period
How Long Is Solar Payback on a 3,500 sq ft Home in Kentucky?
A 14.7 kW system saving ~$2,013/year pays back in about 15.4 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$84,400 vs $31,000 net solar — $53,400+ 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).
Kentucky does not offer a state solar income tax credit. Some Kentucky utilities offer net metering programs, though policies vary by provider. LG&E and KU Energy offer net metering at the avoided cost rate. All Kentucky homeowners qualify for the 30% federal ITC.
At Kentucky's average rate of 11.4¢/kWh and 4.6 peak sun hours, a 3,500 sq ft home (~1,691 kWh/month) typically needs a 14.7 kW system — about 37 panels at 400W. See the [national 3,500 sq ft guide](/guides/how-many-solar-panels-3500-sq-ft-house/) for methodology.
A 14.7 kW system in Kentucky costs roughly $44,200 installed before incentives. The 30% federal ITC reduces net cost to about $31,000. Kentucky does not offer a state solar income tax credit. Some Kentucky utilities offer net metering programs, though policies vary by provider. LG&E and KU Energy offer net metering at the avoided cost rate. All Kentu...
At $31,000 net cost and ~$2,013/year in bill savings, simple payback in Kentucky is about 15.4 years.
Most Kentucky homeowners in this size range see **$53,400+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$193** — compare the [$300/month bill guide](/guides/solar-panels-300-month-electric-bill/) for bill-based sizing.
The US average needs a 15.1 kW system at 11.0-year payback. Kentucky needs 14.7 kW with 15.4-year payback at 11.4¢/kWh and 4.6 sun hours.
$300/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.