Solar Panels in Texas — Monocrystalline 400W Sizing Guide
Texas solar calculator using Monocrystalline 400W. 5.3 peak sun hours/day, avg electricity rate $0.139/kWh. See how many panels you need for any usage level.
Usage & location
Find on your electricity bill
Panel & battery
17
Panels needed
6.5 kW
System size
$14,042
Net cost (after ITC)
8.9 yrs
Payback period
100% offset$1,573/yr savings5.3 sun hrs/day9,673 lbs CO₂/yr offset
| Monthly usage | 900 kWh |
| Annual usage | 10,800 kWh |
| Peak sun hrs/day | 5.3 hrs |
| System size | 6.49 kW-DC |
| Panels needed | 17 |
| Panel area total | 366 sq ft |
| Annual production | 11,313 kWh |
| Offset | 100% |
| CO₂ offset | 9,673 lbs/yr |
| Equivalent trees | 202 trees/yr |
TX — system size by monthly usage
TX — 5.3 peak sun hrs/day. Electricity rate: $0.139/kWh.
TX solar resource vs US average
NREL PVWatts v8 annual average.
TX solar data summary
EIA 2024 electricity rates. NREL PVWatts v8 sun hours.
Best panel for TX (1,000 kWh/month)
All panels sized for 1,000 kWh/month in TX.
TX — annual savings by system size
Annual savings at $0.139/kWh (TX average).
Sources & Standards
- Dobos, A. P. "PVWatts Version 5 Manual." National Renewable Energy Laboratory, NREL/TP-6A20-62641, 2014.PV system output estimation methodology (irradiance, system losses, tilt and azimuth)
- National Renewable Energy Laboratory. "National Solar Radiation Database (NSRDB)."Solar irradiance data underlying production estimates