Castle Hills, TXLocal --:--Sun now --Daylight today --
Sun on a roof in Castle Hills.
The PVWatts model puts a generic roof array in Castle Hills at 1,528 kWh a year for each kW of panels, using typical-year weather from a station 2.2 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 Castle Hills climbs and falls, and the modeled output follows it.
kWh per kW DC, modeled by PVWatts. Best month 154, weakest 102: a ratio of 1.51.
How Castle Hills comparesderived from the figures above
Where Castle Hills sits.
Castle Hills ranks 488th of 1220 Texas places modeled here, at the 60th percentile. Its 1,528 kWh per kW is above the Texas median of 1,515. The strongest months are August, July, June and the weakest are January, December, February; output peaks in August and bottoms out in January. In all, 29.3% of the year arrives in June, July and August, about the same than the 29.3% of the median place.
Closest modeled neighbors
- Balcones Heights, 4 km southwest: 1,499 kWh per kW, 29 less than Castle Hills.
- Olmos Park, 6 km southeast: 1,522 kWh per kW, 6 less than Castle Hills.
- Alamo Heights, 7 km southeast: 1,509 kWh per kW, 19 less than Castle Hills.
- San Antonio, 7 km south: 1,505 kWh per kW, 23 less than Castle Hills.
- Hill Country Village, 7 km northeast: 1,503 kWh per kW, 25 less than Castle Hills.
- Shavano Park, 8 km northwest: 1,456 kWh per kW, 72 less than Castle Hills.
- Terrell Hills, 8 km southeast: 1,509 kWh per kW, 19 less than Castle Hills.
- Leon Valley, 9 km west: 1,497 kWh per kW, 31 less than Castle Hills.
- Hollywood Park, 9 km north: 1,502 kWh per kW, 26 less than Castle Hills.
Against San Antonio
The nearest of the six largest modeled places is San Antonio, 7 km to the south, at 1,505 kWh per kW. Castle Hills models 23 kWh per kW (1.5%) above it. At 0.06 degrees of latitude apart, the two sit at almost the same sun angle, so geometry explains little. The two weather stations sit a similar distance from their points (2.2 km and 2.2 km), so station distance does little to explain the gap, and the weather record does the rest.
The second-nearest large place is Austin, 114 km northeast, where the same model gives 1,483 kWh per kW, so Castle Hills runs 45 above that figure. Against the Texas median place month by month, Castle Hills runs at least 2% higher in February, August, November, December. It runs at least 2% lower in 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 1,528 kWh would come to $189 per kW a year, plain multiplication and not a savings estimate.
Modeled estimateruns in your browser
Size the array, see the kWh.
Scale the Castle Hills 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 $235 per kW a year as plain multiplication.
PVWatts v8station 656465
Month by month, per kW.
| Month | kWh per kW |
|---|---|
| January | 102.2 |
| February | 108.5 |
| March | 126.9 |
| April | 130.7 |
| May | 137.6 |
| June | 141.0 |
| July | 152.9 |
| August | 154.4 |
| September | 128.7 |
| October | 127.3 |
| November | 114.2 |
| December | 103.7 |
| Year | 1,528 |
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 29.52, -98.52 (Castle Hills, population 3,931). Weather: typical-year data from station 656465, 2.2 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.