August 25, 2025
When you think about going solar, one of the first questions that often comes up is: how big are solar panels, and will they fit on my roof? While solar energy is an incredible investment, panel size and system layout play a huge role in determining how much clean power your home can generate.
At US Power, we make sure every installation is tailored to your roof and your energy needs. Let’s break down the dimensions, configurations, and what they mean for your home.
Most residential solar panels are built with silicon photovoltaic (PV) cells arranged in a grid. While exact dimensions can vary by brand and model, here are the most common panel sizes you’ll find for homes:
For most Southern California homeowners, 60-cell and 72-cell panels strike the best balance between efficiency, handling, and rooftop fit.
Panel size matters because it impacts how many units can fit on your roof and how much energy they’ll generate.
To estimate how many panels you need:
For example, if your home uses 900 kWh per month, you’ll need a system that generates about 30 kWh per day. With 6 hours of sunlight, that’s 5 kW of solar capacity. Using 400W panels, that means about 12–14 panels are required.
On average, most California homes need 18–23 panels, which takes up roughly 375–425 square feet of roof space.
Panel size isn’t just about physical dimensions—it affects the efficiency, aesthetics, and long-term value of your system.
At US Power, we evaluate every home holistically—roof size, shading, energy goals—to create a system that maximizes returns.
For most Southern California homeowners, standard 60-cell or 72-cell solar panels are the perfect fit. The real key isn’t just panel size—it’s how your system is designed to meet your specific energy needs and maximize your roof’s potential.
At US Power, we don’t believe in one-size-fits-all solar. Our team designs systems that fit your roof, your budget, and your lifestyle—so you get the most out of your investment.
Contact us today for a FREE CONSULTATION and see how the right solar panels can power your Southern California home for decades to come.
Solar and Roofing Consultant
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