Kirby, TXLocal --:--Sun now --Daylight today --
Sun on a roof in Kirby.
The PVWatts model puts a generic roof array in Kirby at 1,495 kWh a year for each kW of panels, using typical-year weather from a station 1.5 km away. A modeled estimate for a standard setup, not a measurement of any roof.
A year on one roof.
Scroll from January to December: the noon sun over Kirby climbs and falls, and the modeled output follows it.
kWh per kW DC, modeled by PVWatts. Best month 150, weakest 94: a ratio of 1.59.
How Kirby comparesderived from the figures above
Where Kirby sits.
Kirby ranks 792nd of 1220 Texas places modeled here, at the 35th percentile. Its 1,495 kWh per kW is below the Texas median of 1,515. The strongest months are August, July, June and the weakest are February, December, January; output peaks in August and bottoms out in February. In all, 29.5% of the year arrives in June, July and August, more than the 29.3% of the median place.
Closest modeled neighbors
- Windcrest, 6 km north: 1,510 kWh per kW, 15 more than Kirby.
- Terrell Hills, 6 km west: 1,509 kWh per kW, 14 more than Kirby.
- Alamo Heights, 8 km west: 1,509 kWh per kW, 14 more than Kirby.
- China Grove, 9 km southeast: 1,526 kWh per kW, 31 more than Kirby.
- Olmos Park, 10 km west: 1,522 kWh per kW, 27 more than Kirby.
- Converse, 10 km northeast: 1,511 kWh per kW, 16 more than Kirby.
- Live Oak, 12 km northeast: 1,514 kWh per kW, 19 more than Kirby.
- San Antonio, 13 km west: 1,505 kWh per kW, 10 more than Kirby.
- Universal City, 13 km northeast: 1,516 kWh per kW, 21 more than Kirby.
Against San Antonio
The nearest of the six largest modeled places is San Antonio, 13 km to the west, at 1,505 kWh per kW. Kirby models 10 kWh per kW (0.7%) below it. The two figures are within 1 percent, which is about the size of the difference you get from two neighboring weather stations alone, so this page's result is effectively the same as San Antonio's.
The second-nearest large place is Austin, 112 km northeast, where the same model gives 1,483 kWh per kW, so Kirby runs 12 above that figure. Against the Texas median place month by month, Kirby runs at least 2% higher in October, November, December. It runs at least 2% lower in February, April, May, June, September.
Electricity in Bexar CountyEIA-861
Electricity prices nearby
Providers listed in the county
- City of San Antonio: 12.4¢ per kWh, a bundled average, 888,946 residential customers across 8 counties.
- Pedernales Electric Coop, Inc: 12.75¢ per kWh, a bundled average, 420,753 residential customers across 24 counties.
- Guadalupe Valley Elec Coop Inc: 11.83¢ per kWh, a bundled average, 95,358 residential customers across 13 counties.
They are the largest bundled providers whose EIA service territory lists the county. A county can list several, and which one serves a street depends on the address, so check your bill. Priced at the first provider's average, the modeled 1,495 kWh would come to $185 per kW a year, plain multiplication and not a savings estimate.
Modeled estimateruns in your browser
Size the array, see the kWh.
Scale the Kirby model to another array size, take off extra losses for shade or dirt, and price the energy at any rate. It is arithmetic on the PVWatts output above, nothing more: not a quote, not a savings estimate and not advice.
Starting rate: the Texas residential average of 15.4¢ per kWh. At that rate the modeled output is worth $230 per kW a year as plain multiplication.
PVWatts v8station 660497
Month by month, per kW.
| Month | kWh per kW |
|---|---|
| January | 100.6 |
| February | 94.2 |
| March | 125.3 |
| April | 128.5 |
| May | 137.7 |
| June | 141.7 |
| July | 149.6 |
| August | 150.2 |
| September | 129.1 |
| October | 128.7 |
| November | 110.9 |
| December | 98.9 |
| Year | 1,495 |
Model assumptions
- System size
- 1 kWDC, results scale per kW
- Mount
- fixed roof mount
- Tilt
- 20°
- Azimuth
- 180°due south
- Modules
- standard
- System losses
- 14%
Location 29.46, -98.39 (Kirby, population 8,104). Weather: typical-year data from station 660497, 1.5 km from that point.
Getting a measured number
A model cannot see your roof. Installers measure pitch, shade and the electrical panel on site. Quote marketplaces such as EnergySage, SolarReviews and WattBuy collect bids from local installers. Rate & Roof does not rank installers.
Next step
Payback, buyback.
The sliders above price the energy at one rate. The payback calculator adds the system cost and your buyback plan type, and shows every assumption. It is an estimate, not advice.
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Rates change. Get told.
One list, for Texas solar buyback plans. We write when a tracked rate changes and when new city data is published. Nothing else, and nothing until you confirm.