How Much Electricity Do Solar Panels Produce in Texas?

Most homes install around 18 solar panels, which produce an average of about 36 kilowatt-hours of solar energy per day. This is usually enough to cover most, if not all, of a typical home's electricity consumption.

However, the exact amount of electricity your solar panels will generate can vary widely. Production depends on several factors, including:

• The amount of available sunlight 

• The characteristics of the panel 

• Your geographic location 

• The age of the solar panel

Texas homeowners benefit from abundant sunlight, which significantly boosts solar production compared to many other parts of the country. Below, you will find a clear overview of how solar output works and what to expect from a residential system in Texas.

What Is the Power Output of a Solar Panel?

Most modern residential solar panels installed today produce about 400 watts of power under ideal conditions. Power is a real-time measurement of how much electricity a solar panel generates at any given moment and is measured in watts.

Power output of popular solar panels

Brand	Model Series	Output
Qcells	Q.PEAK DUO	400 to 405 W
JA Solar	Deep Blue 3.0	390 to 400 W
Canadian Solar	HiKu6 All-Black	395 to 400 W
Silfab Solar	Silfab Prime	400 to 410 W
REC Solar	Alpha Pure	400 to 410 W

These ratings are measured under Standard Test Conditions, which use perfect lighting at 25 degrees Celsius. Your Texas roof will not always match these conditions, especially during extreme heat waves common in the summer. Higher temperatures generally reduce power output slightly. Fortunately, solar installations are designed to account for this and can still meet your home’s energy needs throughout the year.

How Much Energy Does a Solar Panel Produce?

Energy is the total amount of electricity produced over time. On average, a single solar panel generates about 2 kilowatt-hours of energy per day.

For example, one panel generates enough energy in a single day to run a television for 24 hours straight.

Most homeowners do not install just one panel. Typical homes install between 15 and 19 panels. An average 6 kilowatt solar system produces roughly 915 kilowatt-hours of electricity per month. In Texas, this number is often higher because the state receives more peak sunlight than the national average.

Average energy production of one solar panel

Time Period	Energy Produced
1 day	2 kWh
1 week	14 kWh
1 month	60 kWh
1 year	730 kWh

Four Factors That Affect Solar Panel Electricity Production

Four primary factors determine how much electricity your solar panels will produce:

• Amount of sunlight

• Panel and system characteristics

• Your roof

• The age of the panel

Texas homeowners benefit from long summers, high solar irradiance and wide open skies, giving solar panels excellent conditions for year-round energy production.

1. Amount of Sunlight

The amount of sunlight your home receives is the largest factor affecting how much electricity your panels generate. Texas is one of the sunniest states in the country. Cities like Dallas, Waco, Austin and San Antonio receive between 5.5 and 6.5 peak sun hours per day. This is significantly higher than many northern states.

For comparison: 

A 400-watt panel in Arizona may generate about 3 kWh per day. The same panel in Texas typically produces between 2 and 3 kWh per day depending on location. That same panel installed in Alaska might generate only 1 kWh per day. More sunlight equals more energy production.

2. Panel Characteristics

A solar panel’s design directly affects how much electricity it can produce. Important characteristics include:

• Panel type: Monocrystalline panels are the most efficient. 

• Total number of cells: Residential panels typically use 108 to 120 half-cut cells.

• Technology design: PERC, TOPCon and heterojunction panels improve performance by increasing conversion efficiency. 

• Efficiency rating: The best residential panels can now reach 24 percent efficiency.

  
  

More efficient panels use less roof space and produce more power per square foot. This is especially valuable for Texas homes with limited roof area or partial shading.

3. Your Roof

Your roof’s orientation, shading and surface quality all affect solar energy production.

In the United States, south-facing roofs generate the most electricity. Texas follows the same pattern. East- and west-facing roofs still generate strong energy output, especially in Texas where the sun rises and sets with high intensity.

Estimated daily output of a 400-watt panel with 5 peak sun hours

Roof Direction	Output
South	2 kWh
East	1.7 kWh
West	1.7 kWh
North	1.4 kWh

Shading from trees, chimneys or tall buildings can reduce output. Keeping your roof clear of debris, leaves and branches will help maximize production.

4. The Age of the Panel

Solar panels slowly lose efficiency over time. This is called degradation. The average solar panel degrades at about 0.5 percent per year.

After 25 years, most panels still operate at about 85 percent of their original output. In Texas, where solar irradiance is high, even slightly degraded panels can continue producing meaningful energy for decades.

Solar systems are built with degradation in mind. Homeowners will still see significant energy savings well into the life of the system.

How to Calculate Solar Panel Output

To estimate how much electricity a solar panel will produce, you only need two things:

1. The wattage of the panel 

2. The number of peak sun hours in your area

Example calculation

Panel wattage: 400 watts Peak sun hours: 4 hours

400 watts x 4 hours = 1600 watt-hours = 1.6 kWh per day 1.6 kWh x 30 days = 48 kWh per month 1.6 kWh x 365 days = 584 kWh per year

If you have 18 panels, the total yearly output would be: 18 panels x 584 kWh = 10,512 kWh per year

This is a general estimate. The best way to know exactly how much electricity solar panels will produce on your Texas roof is to speak with a qualified local installer who can evaluate shading, roof angle, climate, equipment type and your home’s energy usage.

Power Your Texas Home With Solar

Now that you understand how much energy solar panels can generate, you can better evaluate how solar fits your home’s needs. Solar does far more than simply power your home with clean energy. It helps you save money every month by reducing how much electricity you buy from your utility company.

Most homeowners can install enough solar panels to cover their entire electricity usage. A 6 kilowatt solar system can save the average homeowner around 140 dollars per month, and savings are often higher in Texas because of the state’s long summers and high electricity rates.

Your exact savings depend on system size, electricity usage, roof orientation and utility programs in your area. The simplest way to get an accurate estimate is to use a solar savings calculator or speak with a vetted local Texas installer.