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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteTexas homes use 40% more electricity than the national average — mainly because of air conditioning. That means you need more solar panels than most online calculators assume. Here's the definitive 5-step sizing guide for TX homeowners in 2026.
The average Texas home uses 1,146 kWh/month. Dividing by the production factor (~130 kWh per panel per month at 440W in TX) = ~9 panels for 80% offset. But most TX homeowners install 8–12 kW (18–27 panels) to offset 80–100% of usage and account for A/C, pools, and EVs.
Online solar calculators often use national averages that dramatically underestimate Texas energy usage. Here's how to size accurately for a TX home.
Check your electric bill or log into your REP portal. Look for "kWh used this month." Texas averages 1,146 kWh/month but ranges from 800 (small condo) to 3,000+ kWh (large home with pool + EV).
Multiply monthly average × 12. Summer months in TX may be 2× winter — use an annual average, not just your July bill.
Texas generates 1,400–1,700 kWh per year for every 1 kW of solar installed (depending on your city). Use 1,500 as a statewide average if you're unsure.
Decide what percentage of your usage you want to offset. 100% offset means you cover all consumption with solar. 80% is common for budget-conscious buyers. Many TX homeowners oversize slightly to maximize savings from buyback plans.
NuWatt uses 440W panels as our standard. Divide system size in watts by panel wattage to get panel count. Round up to the nearest whole panel.
This is for illustration. Your actual number depends on your specific usage, roof angle, panel type, and shading. NuWatt's IQ Wizard gives you a personalized estimate in 60 seconds.
These estimates assume 100% offset, 440W panels, central Texas location (1,500 kWh/kW/year production), and 2026 installed costs of $2.50–$2.90/W. No federal 25D tax credit is included — that expired December 31, 2025.
| Home Size | Monthly Usage | System Size | Panels (440W) | Installed Cost |
|---|---|---|---|---|
| 1,500 sq ft | 800 kWh | 6 kW | 14 | $15,000–$17,400 |
| 2,000 sq ft | 1,100 kWh | 8 kW | 18 | $20,000–$23,200 |
| 2,500 sq ftMost Common | 1,400 kWh | 10 kW | 23 | $25,000–$29,000 |
| 3,000 sq ft | 1,800 kWh | 13 kW | 30 | $32,500–$37,700 |
| 3,500+ sq ft | 2,200+ kWh | 16 kW | 36 | $40,000–$46,400 |
* Costs are before any state/local incentives. Texas property tax exemption applies. Federal 25D ITC = $0 in 2026.
A standard home sizing doesn't account for high-usage appliances and lifestyle factors. If any of these apply to you, add them to your baseline usage calculation.
Adds approximately 250–700 kWh/month to your usage
Adds approximately 100–300 kWh/month to your usage
Adds approximately 200–400 kWh/month to your usage
Adds approximately 50–100 kWh/month to your usage
Adds approximately 80–150 kWh/month to your usage
Adds approximately 150–400 kWh/month to your usage
A single central A/C system running 8–10 hours per day during a TX summer adds 250–700 kWh per month depending on efficiency (SEER2 rating), home insulation, and outdoor temperature. Upgrading from SEER 14 to SEER 20+ can reduce your cooling load 30–40%, meaning you need fewer solar panels. Consider running the SEER upgrade and solar system sizing together for maximum efficiency.
In states with true 1:1 net metering, oversizing your solar system aggressively makes sense — every extra kWh you export earns full retail credit. Texas is different. Most REPs pay $0.06–0.12/kWh for solar exports, while you pay $0.15–0.18/kWh when you import. The math discourages heavy oversizing.
Texas spans multiple climate zones — from the Gulf Coast to the Chihuahuan Desert. Your location significantly affects how many kWh each panel produces per year, which directly impacts how many panels you need.
Gulf Coast humidity reduces efficiency slightly
Great production, high summer output
Central TX — excellent solar resource
High sun hours, dry summers
High elevation, clear skies
Highest production in TX — Chihuahuan Desert
Example: A 10 kW system in El Paso (1,700 kWh/kW/yr) produces 17,000 kWh/year. The same system in Houston (1,400 kWh/kW/yr) produces 14,000 kWh/year — 18% less. El Paso homeowners can get away with fewer panels for the same usage offset.
Our IQ Wizard uses your actual address, roof direction, and utility rate to calculate exactly how many panels you need — in 60 seconds.
The average Texas home uses about 1,146 kWh per month — well above the U.S. average of 886 kWh, primarily due to heavy air conditioning use. To fully offset that usage, a typical Texas home needs a 9–10 kW system, which is approximately 20–23 panels at 440 watts each. However, home size, A/C efficiency, pool ownership, and EV charging can push that number significantly higher.
Yes — Texas has some of the best solar resources in the United States. Most Texas cities see 1,400–1,700 kWh of production per kilowatt of solar capacity per year. For comparison, a rainy Northeast state like Maine produces 1,100–1,200 kWh/kW/year. El Paso rivals Arizona for solar production. Even Houston, with its Gulf Coast humidity, generates 1,400+ kWh/kW/year.
In Texas, oversizing can make sense if your retail electricity provider offers a fair solar buyback rate. Since the 25D residential tax credit expired on December 31, 2025, there's no federal incentive advantage to sizing up — but your REP's buyback program might justify extra panels if the rate vs. retail gap is small. Be cautious: most TX REPs pay $0.06–0.12/kWh for exported power but charge $0.15–0.18/kWh for consumption. The math favors self-consumption over export.
A 10 kW solar system in Texas costs approximately $25,000–$29,000 installed in 2026, or $2.50–$2.90 per watt. This includes panels, inverter, labor, and permitting. The federal 25D residential tax credit expired December 31, 2025 — there is no tax credit for residential solar purchases in 2026. Texas does offer a 100% property tax exemption on the added value of solar.
Without the federal tax credit, payback periods in Texas are approximately 10–14 years in 2026. At $0.15–0.18/kWh retail rates and 1,500 kWh/kW/year production, a 10 kW system saves roughly $2,250–$2,700/year in electricity. On a $26,000 system, that is about 10–12 years payback. With higher electricity rates (likely given ERCOT trends) or battery time-of-use arbitrage, payback can shorten to 8–10 years.
Level 2 EV charging adds about 200–400 kWh per month depending on how much you drive. At 440W panels and 1,500 kWh/kW/year production, each panel generates about 55 kWh/month. To cover 300 kWh of EV charging, you need about 5–6 additional panels beyond your home baseline. Add this to your home energy calculator before finalizing your system size.
NuWatt offers 440W panels as our standard tier (Hyundai 440W at our entry price point, Silfab 440W for Propel financing), and 460W REC Alpha panels at our premium tier. Higher wattage panels allow you to fit the same system capacity in fewer panels — helpful when roof space is limited. Our IQ Wizard tool will show you panel counts and system sizing for your specific property.
