Photovoltaic solar cells are limited primarily by what factor?

• A. Availability of sunlight
• B. Efficiency
• C. Manufacturing cost
• D. Material scarcity

Answer: (A)

The amount of electricity a photovoltaic system can produce is fundamentally limited by how much sunlight actually reaches the panels. Solar energy is governed by insolation—the intensity and duration of sunlight—which varies with location, time of day, weather, and season. Even with perfect efficiency, you can’t generate more energy than the incoming solar power available to the panel. Efficiency determines how much of that light is converted to electricity, but the total production is still capped by the sunlight you receive. Manufacturing cost and material scarcity affect how much you can build or how much you pay, but they don’t set the immediate physical limit on energy harvest; the key limiting resource is sunlight availability.