A 4,000 square foot home in Virginia typically uses about 1,978 kWh per month at the state average rate of 13.9¢/kWh (EIA). With 4.7 peak sun hours per day, most homeowners need a 16.9 kW solar system — roughly 43 panels at 400W. After the 30% federal ITC, net cost is about $35,400, with 12.3-year payback and $84,800+ in estimated 25-year savings.
Content roles: This page is your Virginia-specific sizing decision for 4,000 sq ft. For national methodology and roof/orientation depth, see the 4,000 sq ft national guide. For bill-based sizing, see $300/month (~$275/mo equivalent in Virginia). Policy depth: Virginia solar data.
⚡ System Size
How Many Solar Panels for a 4,000 sq ft House in Virginia?
Virginia electricity rates and sun hours change panel count versus the US average:
System size (kW) = Annual kWh ÷ (Peak sun hours × 365 × 0.82)
For 4,000 sq ft in Virginia:
Estimated monthly usage: ~1,978 kWh
Peak sun hours: 4.7 h/day
System size:16.9 kW (~43 × 400W panels)
Metric
Virginia
US average
Rate
13.9¢/kWh
16.3¢/kWh
Sun hours
4.7 h/day
4.5 h/day
System size
16.9 kW
17.6 kW
Panels (400W)
43
45
Virginia 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 4,000 sq ft Home in Virginia After the ITC?
At $3.00/W installed (SEIA 2026), a 16.9 kW system in Virginia costs about $50,600 before incentives. The 30% ITC saves ~$15,180, for $35,400 net cost.
📈 Payback Period
How Long Is Solar Payback on a 4,000 sq ft Home in Virginia?
A 16.9 kW system saving ~$2,870/year pays back in about 12.3 years after the ITC. At 3% rate escalation, 25-year utility spend totals ~$120,300 vs $35,400 net solar — $84,800+ 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).
Virginia’s Solar Energy Development and Energy Storage Authority (SEDA) provides low-interest loans for solar installations. Dominion Energy Virginia and APCo offer net metering programs. Virginia’s Clean Economy Act set a 100% renewable electricity target by 2045, driving strong utility solar development. Income-qualified residents may access the Low Income Utility Access Program.
At Virginia's average rate of 13.9¢/kWh and 4.7 peak sun hours, a 4,000 sq ft home (~1,978 kWh/month) typically needs a 16.9 kW system — about 43 panels at 400W. See the [national 4,000 sq ft guide](/guides/how-many-solar-panels-4000-sq-ft-house/) for methodology.
A 16.9 kW system in Virginia costs roughly $50,600 installed before incentives. The 30% federal ITC reduces net cost to about $35,400. Virginia's Solar Energy Development and Energy Storage Authority (SEDA) provides low-interest loans for solar installations. Dominion Energy Virginia and APCo offer net metering programs. Virginia's Clean Economy Act ...
At $35,400 net cost and ~$2,870/year in bill savings, simple payback in Virginia is about 12.3 years.
Most Virginia homeowners in this size range see **$84,800+** estimated 25-year savings vs utility power. Equivalent monthly bill: **~$275** — compare the [$300/month bill guide](/guides/solar-panels-300-month-electric-bill/) for bill-based sizing.
The US average needs a 17.6 kW system at 11.0-year payback. Virginia needs 16.9 kW with 12.3-year payback at 13.9¢/kWh and 4.7 sun hours.
$300/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.