Solar panel output in Arizona averages roughly 4.4 kWh per day for each kilowatt of system capacity, based on an NREL model for Tucson. That means a 5 kW system averages about 21.8 kWh a day across the year, and a single 400-watt panel averages about 1.7 kWh. Actual production depends on your roof, shading and equipment.
Solar Pros AZ is a Tucson solar company that designs and installs residential and commercial systems using Qcells panels with SolarEdge or Enphase inverters. We model production for every home before recommending a system size, because a statewide average only gets you part of the way to a real answer.
How much electricity do solar panels produce per day in Arizona?
A solar system’s daily output depends mostly on its size and how much sun reaches the panels. NREL’s model of a 1 kW system in Tucson produced about 1,592 kWh per year, or roughly 4.4 kWh per day on average.
Scaling that benchmark gives a useful starting point for common system sizes.
| System size | Average daily production* | Annual production* |
| 1 kW | 4.4 kWh | 1,592 kWh |
| 3 kW | 13.1 kWh | 4,776 kWh |
| 5 kW | 21.8 kWh | 7,960 kWh |
| 8 kW | 34.9 kWh | 12,736 kWh |
| 10 kW | 43.6 kWh | 15,920 kWh |
*Illustrative figures scaled from the NREL Tucson 1 kW example. Your home’s production may be higher or lower.
These are annual averages spread across the year. Any given day can come in well above or below them.
What is solar panel output?
Solar panel output is the amount of electricity a panel or system generates over time, measured in kilowatt-hours (kWh). It’s different from a panel’s watt rating.
A panel’s wattage describes its capacity under standard test conditions. A 400-watt panel is rated at 0.4 kW, but it won’t produce 0.4 kWh every hour. Its real output depends on how much sunlight reaches it and how well the whole system performs.
How many kWh does a 400-watt panel produce in Arizona?
Using the Tucson benchmark, one 400-watt panel would produce about 637 kWh per year. That averages to roughly 1.7 kWh per day.
The same panel can produce more on a clear spring day and less during a cloudy monsoon afternoon. Roof direction, tilt, shading and heat all shift the number.
Does solar panel output in Arizona change by season?
Yes. In the NREL Tucson example, the 1 kW system produced about 103 kWh in December and 159 kWh in May. Shorter winter days and a lower sun angle bring production down, while long spring days push it up.
Summer isn’t always the peak, even with the longest days. Solar panels lose some efficiency as they heat up, and monsoon clouds can cut into July and August production. That’s why many Tucson systems hit their highest output in late spring.
This matters because your electricity use shifts too. Air conditioning drives most Tucson homes’ biggest bills in summer, so a good design looks at production and usage month by month.
What affects solar panel output in Arizona?
System size
More capacity means more production when everything else is equal. The right size, though, depends on how much electricity your home actually uses, not the number of panels that fit on the roof.
Roof direction and tilt
South-facing roofs generally produce the most, while east- and west-facing roofs still work well in Arizona’s strong sun. Tilt affects how directly sunlight hits the panels through the day and across seasons. Our guide on whether your roof is right for solar covers this in more detail.
Shading
Trees, chimneys, neighboring buildings and roof features can shade part of an array. Even in Tucson, a few hours of shade during peak sun can noticeably reduce output. SolarEdge and Enphase systems help limit the impact by managing each panel individually, so one shaded panel doesn’t drag down the rest.
Heat and weather
Panels still produce on cloudy days, just less. Extreme heat also trims efficiency slightly, which is one reason spring can outperform the hottest summer weeks. You can read more in our post on solar considerations in Arizona.
System losses
Some energy is lost converting sunlight into usable electricity through wiring, inverters and dust on the panels. Production models like NREL’s PVWatts build these losses into their estimates.
How do you estimate your own solar panel output?
A quick estimate multiplies your system size by a production factor:
Estimated daily production = system size (kW) × about 4.36 kWh per kW per day
For a 5 kW system, that works out to about 21.8 kWh per day on average.
For a closer number, NREL’s PVWatts Calculator lets you enter your location, system size, tilt, direction and losses. A site-specific model from a solar installer goes further by using your actual roof measurements, shading and equipment.
How much solar does a Tucson home need?
There’s no single right size. It depends on your yearly electricity use, air conditioning, roof space, shading and any plans like adding an EV or a pool pump.
Start with 12 months of electric bills, which show both your total usage and how it shifts by season. Our post on how high your electric bill should be before going solar can help you decide whether it’s worth a closer look.
What happens to extra solar power on TEP?
Tucson Electric Power uses net billing. When your system produces more than your home is using, the extra goes to the grid, and TEP credits it at an export rate that’s lower than the retail rate you pay for electricity.
That’s why matching production to your usage matters. Some homeowners add a battery to store daytime power for evening use instead of exporting it. Our guide on whether you need a solar battery in Tucson explains when that makes sense.
How can you tell if your panels are producing enough?
Compare your system’s actual output with the production estimate created for it. Solar Pros includes system monitoring, so you can track daily and monthly production and spot any unexpected drop. Looking at a full year of data gives a much clearer picture than any single day.
Frequently asked questions
How much electricity does one solar panel produce per day in Arizona?
A 400-watt panel averages about 1.7 kWh per day based on the NREL Tucson benchmark. Daily output varies with sunlight, shading, roof direction and temperature.
How many kWh does a 5 kW solar system produce per day in Tucson?
About 21.8 kWh per day on average, or roughly 7,960 kWh per year. Some days will be higher and others lower.
Do solar panels produce less in extreme heat?
Yes, slightly. Panels become a little less efficient as they get hotter. Tucson’s strong sun more than makes up for it over the year, but late spring often outproduces midsummer.
Do solar panels work during monsoon season?
Yes. Panels keep producing under clouds, just at a lower level. Production usually bounces back quickly once the storms pass.
How can I find out how much my home could produce?
Get a site-specific production estimate based on your roof, shading and usage. NREL’s PVWatts Calculator is a good starting point, and a free evaluation from a local installer gives you a detailed model.
See your home’s solar potential
General estimates show what’s possible, but your roof and your electric bills tell the real story. For a free evaluation, call Solar Pros at 520-549-6200 or contact us online. You can also try the See Your Solar Model tool on our homepage to see how solar could look on your home in about two minutes.