Does size matter?
Clarifying the doubt about the size of the panels
ENERGY CONSULTINGSOLAR PANELS
Solar365
6/25/2025


"Higher-power solar panels are better" is another common misconception. Just because a solar panel produces a maximum power (peak and under laboratory STC standards) of 580W doesn't mean it's better than one with 460W or 500W, for example. A panel's efficiency has nothing to do with its maximum power. A higher-power panel is usually larger than a lower-power one, so it's not a matter of choosing one panel over another based on the watts it offers; what really counts is the watts it produces per square meter of surface area and the space you have available to install them.
Let's see this with a small practical example.
Let's assume we have to choose between the following three options:
A 460W solar panel measuring 1903 x 1134mm
A 500W solar panel measuring 1909 x 1134mm
A 550W solar panel measuring 2261 x 1134mm
Intuitively, most people tend to choose the 550W panel because it's the "most powerful." However, if we calculate the watts per square meter each panel offers, we get the following numbers:
The 460W solar panel offers 460Wp/(1903 x 1134) = 213Wp/m2
The 500W solar panel offers 500Wp/(1909 x 1134) = 231Wp/m2
The 550W solar panel offers 550Wp/(2261 x 1134) = 214Wp/m2
So, which panel is the most efficient? Indeed, the 500W panel because it offers more peak power per square meter. In this case, the 550W panel is the most powerful, but the most efficient is the 500W. It's also important to consider your roof type to determine which type of panels best fit your roof. Our energy advisors can help you choose the most efficient type of solar panel for your home or business.
Solar panel manufacturers are constantly working to offer more efficient panels, meaning they offer higher output per square meter.
Say yes to green energy, but wisely!
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