Seasonal performance across Virginia
Virginia's climate is friendlier to solar than most residents assume. A well-placed balcony system in Norfolk beats one in Roanoke, but the gap is smaller than the gap between good and bad orientation on the same balcony.
The headline numbers
A well-oriented 1,200 W plug-in system in Virginia produces roughly 1,400–1,700 kWh per year. That's about 3.8–4.7 kWh per day averaged across all seasons — enough to cover a household's daytime baseline load (fridge, router, standby electronics) and a chunk of a discretionary daytime load (laptop, small AC unit).
Output by city
Using NREL's PVWatts model with a 1,200 W south-facing, 20°-tilt system on an unshaded balcony:
| City | Annual kWh | Daily average | Peak month (kWh) | Low month (kWh) |
|---|---|---|---|---|
| Norfolk | 1,690 | 4.6 | 192 (Jul) | 94 (Dec) |
| Richmond | 1,640 | 4.5 | 188 (Jul) | 89 (Dec) |
| Charlottesville | 1,610 | 4.4 | 185 (Jul) | 86 (Dec) |
| Northern Virginia (Arlington) | 1,580 | 4.3 | 182 (Jul) | 82 (Dec) |
| Roanoke | 1,540 | 4.2 | 178 (Jul) | 79 (Dec) |
The spread between Norfolk and Roanoke is about 9%. Not nothing, but small enough that the choice of balcony orientation matters more.
Orientation matters more than latitude
Compare a Richmond system across four orientations:
| Orientation | Annual kWh | vs. south-facing |
|---|---|---|
| South | 1,640 | — |
| Southwest | 1,570 | −4% |
| East or West | 1,240 | −24% |
| North (vertical wall) | 620 | −62% |
Winter vs. summer
Virginia's peak solar month is July. Its worst is December — output drops to about 50–55% of the annual daily average. Two counterintuitive implications:
Winter isn't dead. Even December delivers ~2.5 kWh per day on average, easily covering fridge + standby loads.
Cold helps output. Panels are more efficient at lower temperatures. A cold, clear February day can beat a hazy, hot July afternoon on a per-hour basis.
Shading, the silent killer
Balcony solar's biggest performance risk isn't cloudy weather — it's partial shade from a neighboring building, a tree, or the balcony above. A single microinverter panel that spends four hours per day in shade can lose 30–45% of its annual output.
Before installing, spend a Saturday watching the balcony:
- Note when direct sun first hits it in the morning.
- Note when it moves off.
- Look up during peak hours — is a balcony above you blocking overhead sun?
You want at least 4 hours of unobstructed sun between 10 AM and 3 PM for the numbers above to hold. Less than that, and you should recalibrate expectations before spending on hardware.
Related Reading
- See how seasonal production translates into bill savings in annual energy yield and financial ROI.
- Learn about utility policies in rural service areas in electric co-op rules across Virginia.
- Understand how system size caps affect seasonal output in 1,200 W AC power cap.
Stay updated on Virginia balcony solar
Get notified when the State Corporation Commission issues new HB 395 regulations, forms, or legal updates.
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