Solar panels in Dunwoody: what they cost and what they make
A typical Dunwoody home needs 23 solar panels. They would make about 13,202 kWh a year and cost $24k to $36k before incentives. At today's electricity prices they pay for themselves in about 14.0 yrs.
See panels on your own Dunwoody roof
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What solar costs in Dunwoody
At $3.00 a watt, the median price cash buyers pay nationally, a 9.7 kW system costs about $29,100. Quotes in Dunwoody will usually fall between $24,250 and $36,375. Complex roofs, main-panel upgrades and financing push prices up.
The 30% federal tax credit no longer applies to systems homeowners buy. This estimate includes no state or utility incentives; check with your utility before you buy.
The number that decides whether solar pays in Dunwoody is what your utility pays for the power you send back. Under full payback is about 14.0 yrs. Under net billing it is about 22.5 yrs, because only the ~44% of solar a typical home uses as it is made saves the full retail price.
Cash purchase, prices rising 2.5% a year, panels losing 0.5% a year, $25/kW a year for upkeep. No federal credit for homeowner-owned systems.
Every way to pay for a 9.7 kW system in Dunwoody
Change any number →| Way to pay | Day one | Monthly payment | Monthly net, year 1 | Ahead after 25 years |
|---|---|---|---|---|
| Pay cash Full price on install day | $29,100 | $0 | +$149 | $30k |
| Credit-union loan 8% APR, 20 years, no dealer fee | $0 | $243 | −$94 | $500 |
| “1.99%” solar loan 1.99% APR, 25 years, 25% dealer fee | $0 | $154 | −$5 | $13k |
| Lease $145/mo, +2.9%/yr | $0 | $145 | +$24 | $2,400 |
| Power purchase (PPA) 13.1¢/kWh, +2.9%/yr | $0 | $144 | +$25 | $6,800 |
Under net metering, at 15.4¢/kWh rising 2.5% a year. The “1.99%” loan’s $7,275 dealer fee is included in its payments. Lease and PPA prices are typical offers, not quotes.
How much sunshine Dunwoody gets
kWh per kW, 25° southMay is the best month for solar in Dunwoody, and Dec the weakest: a Dec day makes 63% of a May day. A 6 kW system would make about 507 kWh in Dec and 800 kWh in May.
On June 21 the sun rises at 6:26 am and sets at 8:51 pm, 14 hours 25 minutes of daylight. On December 21 it is up from 7:38 am to 5:32 pm, just 9 hours 53 minutes.
Peak sun hours in Dunwoody, month by month
| Month | Flat ground | Panels at 32° | kWh per kW |
|---|---|---|---|
| Jan | 2.7 | 4.2 | 96 |
| Feb | 3.2 | 4.3 | 92 |
| Mar | 4.3 | 5.1 | 119 |
| Apr | 5.5 | 5.7 | 129 |
| May | 6.1 | 5.7 | 133 |
| Jun | 6.2 | 5.6 | 126 |
| Jul | 6.0 | 5.5 | 127 |
| Aug | 5.5 | 5.4 | 124 |
| Sep | 4.8 | 5.4 | 118 |
| Oct | 4.0 | 5.2 | 117 |
| Nov | 3.0 | 4.7 | 102 |
| Dec | 2.3 | 3.7 | 85 |
| Year | 4.5 | 5.0 | 1,367 |
A peak sun hour is one hour of sunlight at 1,000 W per m². Why sites disagree.
The best angle and direction for panels in Dunwoody
| Roof faces (6/12 pitch) | Output vs south | kWh per kW |
|---|---|---|
| South | 100% | 1,367 |
| Southeast | 96% | 1,312 |
| Southwest | 96% | 1,312 |
| East | 85% | 1,162 |
| West | 84% | 1,148 |
| North | 64% | 875 |
Face panels south and tilt them 32° for the most energy over a year. East and west roofs keep about 85% of that. A north-facing roof keeps 64%, which is rarely worth the money. Try other angles.
Where the sun goes over Dunwoody
The noon sun is lower in winter, which is why the best winter tilt (57°) is steeper than the best summer tilt (5°).
Dunwoody's homes
Dunwoody has 21,225 households. 56.2% own their home, and 10,577 of those owners live in single-family houses, the kind of home that usually gets rooftop solar.
The median home here was built in 1984. Many roofs that age are due for replacement. Replace the roof first, then add solar: taking panels off and putting them back later costs thousands.
41.4% of homes heat with electricity and 57.3% with gas. If you switch to a heat pump or an electric car, plan for more panels or leave room on the roof.
Source: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates.
If the power goes out in Dunwoody
Solar panels alone shut off in a blackout. Add a battery and they keep going. One Tesla Powerwall 3 (13.5 kWh) running a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave (6.9 kWh a day):
Change the appliances, the battery and the weather in the battery calculator.
Questions people ask about solar in Dunwoody
How much do solar panels cost in Dunwoody?
A 9.7 kW system — enough for the average Georgia home — costs about $24,250 to $36,375 before incentives, based on $2.50–$3.75 per watt. The 30% federal credit no longer applies to systems homeowners buy.
How many solar panels does a house in Dunwoody need?
About 23 panels of 420 watts for a home using 1,074 kWh a month, the Georgia average. Each kilowatt of panels here makes about 1,367 kWh a year on a south-facing roof.
Is solar worth it in Dunwoody?
Over 25 years, solar power here costs about 11.3¢ per kWh, against 15.4¢ from the grid today. Payback is about 14.0 yrs if your utility credits exported power at the full retail rate, and 22.5 yrs if it pays about 30% of retail.
How many peak sun hours does Dunwoody get?
5.0 a day on panels tilted to 32°, and 4.5 on flat ground. The best month is Apr; the weakest is Dec.
What is the best angle for solar panels in Dunwoody?
32° for the most energy over a year, facing south. 57° is best in winter and 5° in summer. On a normal pitched roof, anything within 15° of 32° gives you about 95% of the maximum.
How long would a home battery last in a Dunwoody power outage?
A Tesla Powerwall 3 running a fridge, freezer, furnace fan, lights, Wi-Fi, TV and microwave (6.9 kWh a day) lasts about 43 hours with no sun. With 7 kW of solar to recharge it, it gets through a three-day outage even in overcast January.
Solar near Dunwoody
| City | Miles | kWh per kW | Sun hours |
|---|---|---|---|
| Sandy Springs, GA | 3 | 1,373 | 5.0 |
| Brookhaven, GA | 6 | 1,375 | 5.0 |
| Roswell, GA | 7 | 1,372 | 5.0 |
| Johns Creek, GA | 9 | 1,375 | 5.0 |
| Alpharetta, GA | 9 | 1,374 | 5.0 |
Dunwoody shares a weather-data neighbourhood with Atlanta; their sunshine numbers differ by less than our data can resolve. Housing, prices and outage figures are specific to Dunwoody.
Cities with the same sunshine as Dunwoody
These far-away cities get almost exactly as much solar energy per panel.
- St. Cloud, MN 1,371 kWh per kW
- Shreveport, LA 1,369 kWh per kW
- Columbia, MO 1,368 kWh per kW
Snow: NASA records about 3 cm of snow on the ground here in an average January. Covered panels make little until it slides off, and these figures (like PVWatts') don't subtract that.
Sources: NASA POWER 2001–2020 monthly climatology (grid cell 52 km from Dunwoody's Census point), our PV model (within 1.6% of NLR PVWatts® on average), U.S. EIA prices and use, U.S. Census 2025 population estimates and ACS 2020–2024. Estimates for an average home, not a site survey. How we calculate.