Solar panels in Apex: what they cost and what they make
A typical Apex home needs 21 solar panels. They would make about 12,350 kWh a year and cost $22k to $33k before incentives. At today's electricity prices they pay for themselves in about 22.6 yrs.
See panels on your own Apex roof
Type your address. You get your roof from above, the panels that fit, a month-by-month forecast and a battery test. No phone number.
What solar costs in Apex
At $3.00 a watt, the median price cash buyers pay nationally, a 8.8 kW system costs about $26,400. Quotes in Apex will usually fall between $22,000 and $33,000. 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 Apex is what your utility pays for the power you send back. Duke Energy Carolinas: new customers get a Net Metering Bridge or time-of-use rider with exports at avoided cost. Under full payback is about 14.0 yrs. Under net billing it is about 22.6 yrs, because only the ~43% 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 8.8 kW system in Apex
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 | $26,400 | $0 | +$74 | $3,600 |
| Credit-union loan 8% APR, 20 years, no dealer fee | $0 | $221 | −$147 | −$23k |
| “1.99%” solar loan 1.99% APR, 25 years, 25% dealer fee | $0 | $140 | −$66 | −$12k |
| Lease $80/mo, +2.9%/yr | $0 | $80 | +$12 | $900 |
| Power purchase (PPA) 7.6¢/kWh, +2.9%/yr | $0 | $78 | +$14 | $3,900 |
Under net billing, the usual rule for new customers here, at 14.9¢/kWh rising 2.5% a year. The “1.99%” loan’s $6,600 dealer fee is included in its payments. Lease and PPA prices are typical offers, not quotes.
How much sunshine Apex gets
kWh per kW, 25° southMay is the best month for solar in Apex, and Dec the weakest: a Dec day makes 64% of a May day. A 6 kW system would make about 523 kWh in Dec and 817 kWh in May.
On June 21 the sun rises at 5:59 am and sets at 8:34 pm, 14 hours 35 minutes of daylight. On December 21 it is up from 7:21 am to 5:05 pm, just 9 hours 44 minutes.
Peak sun hours in Apex, month by month
| Month | Flat ground | Panels at 34° | kWh per kW |
|---|---|---|---|
| Jan | 2.6 | 4.3 | 99 |
| Feb | 3.3 | 4.6 | 98 |
| Mar | 4.3 | 5.2 | 124 |
| Apr | 5.5 | 5.7 | 134 |
| May | 6.0 | 5.6 | 136 |
| Jun | 6.4 | 5.7 | 132 |
| Jul | 6.1 | 5.6 | 133 |
| Aug | 5.5 | 5.4 | 127 |
| Sep | 4.6 | 5.2 | 116 |
| Oct | 3.7 | 5.0 | 114 |
| Nov | 2.9 | 4.6 | 100 |
| Dec | 2.3 | 3.8 | 87 |
| Year | 4.4 | 5.1 | 1,400 |
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 Apex
| Roof faces (6/12 pitch) | Output vs south | kWh per kW |
|---|---|---|
| South | 100% | 1,400 |
| Southeast | 96% | 1,344 |
| Southwest | 95% | 1,330 |
| East | 84% | 1,176 |
| West | 83% | 1,162 |
| North | 62% | 868 |
Face panels south and tilt them 34° for the most energy over a year. East and west roofs keep about 84% of that. A north-facing roof keeps 62%, which is rarely worth the money. Try other angles.
Where the sun goes over Apex
The noon sun is lower in winter, which is why the best winter tilt (59°) is steeper than the best summer tilt (7°).
Apex's homes
Apex has 25,235 households. 76.5% own their home, and 19,116 of those owners live in single-family houses, the kind of home that usually gets rooftop solar.
The median home here was built in 2008. Most roofs this young have years of life left, which makes them good candidates for solar.
34.8% of homes heat with electricity and 63.9% 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 Apex
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 Apex
How much do solar panels cost in Apex?
A 8.8 kW system — enough for the average North Carolina home — costs about $22,000 to $33,000 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 Apex need?
About 21 panels of 420 watts for a home using 1,015 kWh a month, the North Carolina average. Each kilowatt of panels here makes about 1,400 kWh a year on a south-facing roof.
Is solar worth it in Apex?
Over 25 years, solar power here costs about 11.0¢ per kWh, against 14.9¢ from the grid today. Payback is about 14.0 yrs if your utility credits exported power at the full retail rate, and 22.6 yrs if it pays about 30% of retail. Most new customers in North Carolina are on the lower rate.
How many peak sun hours does Apex get?
5.1 a day on panels tilted to 34°, and 4.4 on flat ground. The best month is Apr; the weakest is Dec.
What is the best angle for solar panels in Apex?
34° for the most energy over a year, facing south. 59° is best in winter and 7° in summer. On a normal pitched roof, anything within 15° of 34° gives you about 95% of the maximum.
How long would a home battery last in a Apex 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 Apex
| City | Miles | kWh per kW | Sun hours |
|---|---|---|---|
| Cary, NC | 5 | 1,413 | 5.1 |
| Holly Springs, NC | 5 | 1,417 | 5.1 |
| Raleigh, NC | 15 | 1,415 | 5.1 |
| Chapel Hill, NC | 17 | 1,403 | 5.0 |
| Durham, NC | 17 | 1,404 | 5.0 |
Apex shares a weather-data neighbourhood with Raleigh; their sunshine numbers differ by less than our data can resolve. Housing, prices and outage figures are specific to Apex.
Cities with the same sunshine as Apex
These far-away cities get almost exactly as much solar energy per panel.
- Lake Charles, LA 1,414 kWh per kW
- Great Falls, MT 1,415 kWh per kW
- Fargo, ND 1,412 kWh per kW
Snow: NASA records about 5 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 43 km from Apex'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.