How Many Solar Panels Do I Need?

If you’re thinking about getting solar panels for your home, you want to make sure you get the right system size. Too big, and you’re spending more than you need to. Too small, and you’re leaving potential savings on the table. So, how do you figure out the right size for your solar system? Let’s break it down.

How Big Should Your Solar Array Be?

Most solar companies will aim to offset 100% of your electricity use, based on the past 12 months of your energy bills. That sounds great in theory, but in reality, factors like roof space and budget often determine what’s actually possible. A lot of solar homes in cities don’t have quite enough roof space for 100% offset.

The good news? You don’t have to hit 100% offset to get a great return on investment. A slightly smaller system can still make financial sense, even if the cost per panel is a little higher. The key is finding a balance between cost, energy production, and long-term savings.

How Solar Systems Are Sized

Solar systems are typically designed based on how much electricity you used over the last year. Installers will use that data to size your system so that, if your usage stays the same, your panels will generate the equivalent amount of energy over a year.

However, not all solar panels are the same. Different panels have different wattage ratings, meaning one company might quote you a 20-panel system using 400W panels, while another could achieve the same energy production with fewer panels that have a higher wattage. The total system size—measured in kilowatts (kW)—is what really matters.

Understanding System Size (kW) vs. Energy Production (kWh)

When comparing solar quotes, the system size in kilowatts (kW) is the most important number to focus on. The higher the kW rating, the more electricity your system can generate.

Some companies may provide estimates for annual energy production (measured in kilowatt-hours, or kWh), but these numbers can be manipulated based on assumptions about sunlight, weather conditions, and system efficiency.

That’s why it’s better to compare quotes based on kW size rather than just projected energy production.

Why Production Estimates Can Vary

Solar installers don’t always estimate energy production the same way. Some might be overly optimistic, which makes the payback period and savings look better on paper. Others might be more conservative.

In our experience, residential solar companies rarely underestimate energy production. If you’re getting multiple quotes, look at the differences in production estimates and system sizes—if one company’s numbers seem too good to be true, they probably are.

Key Takeaways

• You don’t need 100% energy offset to get great savings from solar.

• The size of your system in kilowatts (kW) matters more than the number of panels or estimated production.

• Production estimates (kWh) can vary, so take them with a grain of salt.

• Get multiple quotes to compare realistic system sizes and pricing.

If you’re thinking about solar, we can help you determine the right system size for your home. Get in touch for a free solar quote, and we’ll walk you through your options.