A 3,500 square foot home in Tennessee typically uses about 1,691 kWh per month at the state average rate of 12.2¢/kWh (EIA). With 5.0 peak sun hours per day, most homeowners need a 13.6 kW solar system — roughly 34 panels at 400W. After the 30% federal ITC, net cost is about $28,500, with 13.2-year payback and $61,800+ in estimated 25-year savings.
Content roles: This page is your Tennessee-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 (~$206/mo equivalent in Tennessee). Policy depth: Tennessee solar data.
⚡ System Size
How Many Solar Panels for a 3,500 sq ft House in Tennessee?
Tennessee 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 Tennessee:
Estimated monthly usage: ~1,691 kWh
Peak sun hours: 5.0 h/day
System size:13.6 kW (~34 × 400W panels)
Metric
Tennessee
US average
Rate
12.2¢/kWh
16.3¢/kWh
Sun hours
5.0 h/day
4.5 h/day
System size
13.6 kW
15.1 kW
Panels (400W)
34
38
Tennessee 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 Tennessee After the ITC?
At $3.00/W installed (SEIA 2026), a 13.6 kW system in Tennessee costs about $40,700 before incentives. The 30% ITC saves ~$12,210, for $28,500 net cost.
📈 Payback Period
How Long Is Solar Payback on a 3,500 sq ft Home in Tennessee?
A 13.6 kW system saving ~$2,154/year pays back in about 13.2 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$90,300 vs $28,500 net solar — $61,800+ 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).
Tennessee does not offer a state solar tax credit. TVA (Tennessee Valley Authority) customers may be eligible for the TVA Green Power Providers program. EPB in Chattanooga and other municipally-owned utilities have their own renewable energy programs. Federal 30% ITC applies to all Tennessee installations.
At Tennessee's average rate of 12.2¢/kWh and 5.0 peak sun hours, a 3,500 sq ft home (~1,691 kWh/month) typically needs a 13.6 kW system — about 34 panels at 400W. See the [national 3,500 sq ft guide](/guides/how-many-solar-panels-3500-sq-ft-house/) for methodology.
A 13.6 kW system in Tennessee costs roughly $40,700 installed before incentives. The 30% federal ITC reduces net cost to about $28,500. Tennessee does not offer a state solar tax credit. TVA (Tennessee Valley Authority) customers may be eligible for the TVA Green Power Providers program. EPB in Chattanooga and other municipally-owned utilities have th...
At $28,500 net cost and ~$2,154/year in bill savings, simple payback in Tennessee is about 13.2 years.
Most Tennessee homeowners in this size range see **$61,800+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$206** — 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. Tennessee needs 13.6 kW with 13.2-year payback at 12.2¢/kWh and 5.0 sun hours.
$300/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.