Business owners often ask us how do solar cells work when they are evaluating rooftop systems. Every panel on a Dallas roof turns sunlight into electricity through a process called the photovoltaic effect. Solar cells are the engine inside each panel. They grab photons from the Texas sun and shake electrons loose from silicon atoms. Those electrons then travel down a one-way path. That movement is electricity.
At DFW Solar Electric, we have been sizing and installing commercial solar systems across North Texas for years. We know how the technology performs when the pavement hits 105 degrees and when hail rolls through in spring. This post breaks down how photovoltaic cells generate power, what the different cell types mean for your building, and why the DFW climate changes the math.
How does a solar cell work at the atomic level? Each cell has two layers of silicon. The top layer is doped with phosphorus, which gives it extra electrons with a negative charge. The bottom layer is doped with boron, which creates a positive charge. Where the two layers meet, an electric field forms.
Think of a solar cell like a one-way street for electrons. On one side is a region with too many electrons, eager to move. On the other side is a region that wants them. The barrier between the two creates an invisible push. When sunlight hits the cell, photons knock electrons loose. The electric field shoves those free electrons toward metal contacts on the cell surface. From there they travel through wires as direct current, or DC.
That current flows into an inverter, which converts it to alternating current your building can use. The process has no moving parts. It makes no noise. It happens in every cell, in every panel, every moment the sun is up. A single commercial installation might contain thousands of these cells, each silently producing power.
Once clients see how solar cell work in principle, they want to know which cell type fits their building and budget. That choice shapes efficiency and durability. It also determines how the system handles the realities of a Texas summer.
Not all solar cells are built the same way. The type of cell in your panels affects efficiency, cost, and how the system handles heat.
Monocrystalline cells are cut from a single crystal of silicon. They have the highest efficiency rates, usually between 19 and 22 percent. They also perform better in high temperatures than other types, which matters in Dallas. Their downside is cost. Manufacturing them is the most expensive option. For commercial buildings with limited roof space, the higher efficiency per square foot usually justifies the premium.
Polycrystalline cells are made from melted silicon fragments poured into molds. They are cheaper to produce but slightly less efficient, typically in the 15 to 17 percent range. They also lose more output as the temperature rises, which is a real consideration during a Texas summer when rooftop temperatures can exceed 140 degrees. Polycrystalline panels work fine for buildings with generous roof area where cost matters more than squeezing every possible watt from limited space.
Thin-film cells use layers of photovoltaic material deposited on glass or plastic. These cells cost the least and deliver the lowest efficiency, often under 12 percent. Their advantage is flexibility and lighter weight. Some thin-film technologies handle shading better than crystalline silicon because they lack the string wiring that creates bottlenecks. For most commercial rooftops in DFW, however, monocrystalline or polycrystalline panels make more sense because roof space is limited and efficiency per square foot matters.
When we evaluate a commercial site, we look at roof area, structural load capacity, and shading patterns. The payback goals are part of the analysis too. Then we recommend the cell type that fits those constraints.
A solar panel is a sandwich of layers. Each one does a specific job, and each one has to survive decades on a roof in North Texas.
Every layer has to perform. The glass has to handle hailstones. The backsheet has to resist UV degradation. The junction box has to seal out water during driving rain. When we specify panels for a DFW commercial install, we verify every layer meets the standards for this climate.
Solar panels produce direct current. Your building runs on alternating current. The inverter bridges that gap, and the type of inverter you choose shapes the system's reliability and monitoring capability. Shade handling depends on the specific model.
There are three common inverter setups for commercial buildings.
String inverters connect a row of panels in series, feeding their combined DC output into a single inverter. This setup is the simplest and cheapest option. The problem is that one shaded or dirty panel can reduce output for the entire string. In a large commercial array with rooftop equipment creating shadows, that risk adds up. String inverters work best on unshaded, uniform roofs.
Micro-inverters mount on the back of each individual panel. Each panel operates independently, converting DC to AC right at the source. If one panel underperforms because of shading or soiling, the rest keep producing at full capacity. The tradeoff is higher upfront cost and more equipment on the roof, which means more potential failure points over a 25-year lifespan.
Power optimizers sit between the two approaches. A power optimizer attaches to each panel and conditions the DC before sending it to a central inverter. You get panel-level monitoring without the full cost of micro-inverters. For many DFW commercial installs, this is the sweet spot. You catch underperforming panels before they cost you money, and you still have a simpler inverter layout than a full micro-inverter system. A commercial solar assessment will confirm which inverter setup matches your building.
Solar cells work best in cold, sunny conditions. That is not what Dallas delivers in July. When panel temperature climbs above 77 degrees Fahrenheit, efficiency drops. Most panels lose roughly 0.4 to 0.5 percent of their rated output for every degree over that threshold. On a 100-degree day with panels hitting 140 degrees or more, that derating is real. A 300-watt panel might be producing closer to 250 watts.
This is why cell selection matters for Texas businesses. Monocrystalline cells with lower temperature coefficients hold more of their rated power when the roof is baking. A solar photovoltaic installer who knows the DFW climate will account for that derating in the system design instead of promising output based on lab conditions. Lab ratings assume 77 degrees and perfect sunlight. Your roof in August is neither.
Hail is another local factor. North Texas gets severe storms. Tempered glass on quality panels is tested to withstand impacts from one-inch hail at 50 miles per hour. Not every panel on the market meets that standard. We install commercial solar systems rated for the weather patterns we actually see here. We have walked enough roofs after spring storms to know what holds up and what does not.
Dust and pollen also matter. Dallas has its share of both. Panels that sit under a film of dust lose 5 to 15 percent of their potential output. The solution is occasional cleaning and a design that accounts for realistic soiling levels, not perfect lab cleanliness. Some of our commercial clients add cleaning to their maintenance schedule once or twice a year. Others rely on rain to do the job. Either way, the system is sized for real-world conditions.
Solar is a regional technology. A designer in Seattle faces shade from evergreen trees and low sun angles. A designer in Phoenix faces extreme heat and dust. In DFW, we face all three: high heat, hail risk, and pollen loads that vary by season.
A local solar expert knows which roof orientations catch the most sun during peak rate hours. South-facing roofs produce the most total energy, but west-facing roofs produce more during afternoon peak demand when electricity rates are highest. Depending on your utility rate structure, west-facing panels can save more money even if their total annual output is lower.
Local knowledge also shows up in the details. A team that works in Dallas knows which ballast systems hold up to wind on flat commercial roofs. They know how to route conduit to avoid blocking drains or HVAC access. They know which permitting offices require specific documentation and which inspectors look for particular mounting details. That knowledge does not come from a national playbook. It comes from years of working on buildings in Dallas, Fort Worth, Plano, and the surrounding area.
Commercial solar also carries different incentives than residential systems. As of September 2026, the commercial Section 48E investment tax credit remains at 30 percent. It phases down after 2026, so businesses that start projects soon lock in the higher rate. MACRS depreciation on a five-year schedule is still active for commercial systems, letting businesses recover costs quickly through tax deductions. Texas offers a full property tax exemption on the added value of solar equipment under Section 11.27, with no expiration on the books. Section 201 tariffs on imported solar modules expired in February 2026, which has helped stabilize equipment pricing.
Residential Section 25D expired at the end of 2025, so businesses evaluating solar should focus on commercial-specific programs. A local team stays current on these rules and structures financing around what is actually available.
Understanding how solar cells work is the first step. The next step is a site assessment that looks at your roof, your electrical service, your usage patterns, and your goals. We size systems based on real conditions in DFW, not optimistic assumptions.
Talk to a solar expert at DFW Solar Electric and we will show you what a commercial solar array could look like on your property. We will account for the heat, the hail, and the dust. Then we will show you the numbers.