How Many Solar Panels Do I Need for My House in Arizona?

Updated: July 25, 2025

Quantity & Quality Solar Panels: How Many Solar Panels Do I Need?

Calculating the number of solar panels needed to meet your energy requirements. When it comes to installing solar panels, people frequently ask us how many solar panels they need on their roof. The answer depends on several factors, including the amount of energy you use, the wattage and quality of the panels, and the location of the panels on your roof. We discuss each of these in turn so that you can make the best choice when deciding to go solar.  

At Solar Topps, we serve the entire state of Arizona. Since we are located in Downtown Phoenix, we do specialize in the Phoenix Metro area in cities like Scottsdale, Paradise Valley, Fountain Hills, San Tan Valley, Mesa, Gilbert, Chandler, and much more!

If you have any questions, please Contact Us. You can also request a Residential or Commercial Quote. 

Understanding Your Energy Consumption: How to Calculate Solar Panel Usage

Many of the electrical appliances in your home, such as the air conditioning unit, refrigerator, washing or drying machine, all use electricity that comes to your home from the energy provided by the utility company. The electricity you use in your home is measured in kilowatt-hours (kWh). The average home uses about 30 kWh a day. The meter on the side of your home changes each month as you use more or less energy than you did in the previous month. The utility company checks this reading each month and bills you accordingly.  If you have any questions about Solar, please inquire for a Quote here. 

Be Proactive Against Rising Energy Costs in Arizona

With the rising cost of electricity in the United States, gaining energy independence is beneficial. Now, utility companies must use more clean energy. However, even though this energy will enable them to produce power at very low kWh rates, they insist on charging their traditional, escalating rates. We believe you can cut out the middleman and use your energy, your way, by making the switch to solar.  

How to Calculate Solar Panel Usage

Calculating solar panel usage involves determining how much energy your household consumes and how much energy the solar panels on your property can produce. Start by reviewing your electricity bills to understand your average monthly energy usage, measured in kilowatt-hours (kWh). Next, consider factors like the average sunlight hours your location receives and the efficiency of the solar panels you intend to install. Multiply the panel efficiency by the total sunlight hours and the panel’s wattage to estimate daily energy production. By comparing your household’s energy needs with the solar panel output, you can determine the number and type of panels required to offset your energy consumption effectively. These calculations are crucial in creating a system tailored to your energy needs.

We Serve Arizona Residents: The Land of the Sun

Arizona has some of the best access to the sun in the world. This is measured by determining peak sunlight hours, which are defined as an hour of sunlight that offers 1,000 watts (1 kilowatt) of photovoltaic power per square meter. In essence, this is measuring the intensity of sunlight in a specific area, typically when the sun is its highest in the sky. Arizona averages about 6.5 hours/day, which ranks it among the highest in the United States. With this amazing access to the sun, more Arizona homeowners are seeing the benefits of going solar as a means to reduce their electricity in Arizona.

What are the Major Cities that Need Solar Panels in Arizona?

Arizona’s largest cities, such as Phoenix, Tucson, Mesa, and Chandler, are prime candidates for solar panel installations. These urban areas experience high energy demands due to their growing populations and intense desert heat, particularly during the summer months. Solar panels provide a sustainable and cost-effective way to offset electricity costs in these regions while also supporting the state’s renewable energy goals. With abundant sunlight year-round, residents and businesses in these cities can maximize their investment in solar power, significantly reducing their reliance on traditional energy sources.

Premium Solar Products Make a Difference For Arizona Residents

Calculating: If your solar panels can absorb more sunlight or have a higher wattage, then you may not need as many installed on your roof. Solar Topps uses only Tier 1, monocrystalline solar panels that range from 300 – 400 watts per panel. We couple these panels with Enphase microinverters, which provide the ultimate premium quality at an affordable price. We prefer Enphase because of its reliability in performing in the most extreme elements, such as Arizona summers. 

An Example with a 310-Watt Solar Panel

So, how does the size of the panel impact the amount you require? Let’s use a 310-watt panel as an example. The average peak sun hours is 6.5. When you multiply this by the panel wattage of 310, you get the daily watt-hours per panel. So, 6.5 times 310 equals 2,015 watt-hours. Remember, we measure energy in kilowatt-hours (kWh), where “kilo” means 1,000. In our example, the panel will produce 2.015 kWh per day. If the average home consumes 30 kWh daily, you’ll need approximately 15 solar panels on your roof. You would need fewer panels if they were a higher wattage and vice versa.

The Location of the Solar Panel’s Size and Location

The panel’s size and wattage matter, but so do the roof’s size, direction, and pitch. In Arizona, varying roof directions generate different energy amounts based on sun orientation and sunlight exposure. South-facing roofs receive the most sunlight, making them the preferred location for solar panel installation. In preference, prioritize west and east-facing roofs, while only consider north-facing roofs if necessary. Depending on your particular circumstances, the difference in production can be as much as 30%. 

How Does a Solar Panel’s Size Matter?

The size of a solar panel is directly related to its energy output capacity. Larger panels typically contain more photovoltaic cells, allowing them to convert greater amounts of sunlight into electricity. However, the size of the solar panel must be compatible with the available roof space. For residential installations in Arizona, it is essential to balance panel size with the overall energy needs and the space constraints of the property. Larger panels may require sturdier mounting structures to ensure durability and stability, especially in areas prone to high winds or adverse weather conditions. Careful planning and assessment are crucial to selecting the appropriate panel size for maximum efficiency and cost-effectiveness.

How Does a Solar Panel’s Location Matter?

The location of a solar panel significantly impacts its performance and energy output. Optimal placement ensures maximum exposure to sunlight throughout the day, which is crucial for generating electricity efficiently. South-facing installations are generally considered ideal in the northern hemisphere because they receive the most sunlight. The best tilt angle of the solar panels should be adjusted based on the geographic latitude of the installation site to maximize energy capture. Obstacles such as trees, buildings, or other structures must also be avoided, as shading can reduce a panel’s efficiency. Regular maintenance and positioning adjustments may further enhance long-term performance. Properly evaluating and selecting the location is a vital part of the solar panel setup process, leading to better energy yields and a faster return on investment.

The Main Takeaway: How to Calculate How Many Solar Panels You’ll Need for Your House 

Knowing your energy consumption is crucial for calculating the number of solar panels needed for your roof. When you request a quote from Solar Topps, we will calculate your annual kWh usage by analyzing your utility bills. Then, based on the layout and orientation of your roof planes, we will determine how much energy you can offset. Using only premium products, Solar Topps in Phoenix, AZ, ensures that each panel on your roof drives value for you and your family. Trust Solar Topps experts for the best money-saving home solar system.