How to Size a Solar System – A Comprehensive Guide | Energy 101

March 27, 2024 | by Michael Devereaux


How to Size a Solar System – A Comprehensive Guide

Welcome to Energy 101, your source for information on all things solar. In this article, we will discuss the process of sizing a solar system for your home. If you are considering going solar, this guide will provide you with the necessary information to make an informed decision. Let’s get started!

Why Go Solar?

Before we delve into the details of sizing a solar system, let’s first emphasize the numerous benefits of switching to solar energy:

  • Significant cost savings on your energy bill
  • Minimize your carbon footprint and help protect the environment
  • Increase your energy independence
  • Potential for tax incentives and rebates

The Case of Walt Disney World

Solar power has gained significant traction in recent years, with large scale projects like the one at Walt Disney World grabbing headlines. Disney has installed a 270-acre solar facility with half a million panels, producing 50 megawatts of power. This project highlights the tremendous potential of solar energy in providing clean and sustainable power solutions.

Understanding Solar System Sizing

Now let’s shift our focus to sizing a solar system for your home. How do you determine the number of panels you need? The process involves several key factors:

Evaluating Your Energy Needs

The first step is to understand your energy consumption patterns. To accurately assess your needs, gather your energy bills from the past year. This will provide valuable data for determining the size of your system.

Working with Monthly Projections

Once armed with a year’s worth of bills, our experts can create a month-by-month projection of your energy usage. This projection will indicate how much of your energy bill can be offset by solar power. By analyzing your historical data, we can estimate the savings you can expect with solar energy.

Future Considerations

A crucial aspect of system sizing is considering potential changes in your energy needs. Factors such as the addition of an electric car, expanding your family, or installing an electric pool heater should be taken into account. By accounting for future changes, your solar system can be designed to accommodate increased energy consumption.

Reducing before Producing

Before installing solar panels, it is important to assess the efficiency of your appliances and electrical systems. Updating outdated appliances and optimizing energy consumption can significantly reduce your energy usage. This reduces the number of panels needed and maximizes the efficiency of your system.

The Logic of Energy Efficiency

Think of solar installation as a home improvement project. Just like restoring a vehicle, it is crucial to address the inefficient elements. Upgrading to energy-efficient appliances, replacing old water heaters, or optimizing pool pumps can enhance the overall performance of your solar system. By reducing energy waste, you can optimize the benefits of solar energy.

System Expansion

Planning for the future is a key element of system sizing. If you anticipate changes in energy consumption, such as adding an addition to your home or installing a pool, it is important to plan accordingly. While expanding an existing system is possible, it requires careful consideration and proper permitting to ensure compliance with regulations. Consulting with our experts can help you design a scalable system that can accommodate future energy needs.


Sizing a solar system is a critical step in transitioning to clean and sustainable energy. By carefully evaluating your energy needs, considering future changes, and optimizing energy efficiency, you can design a solar system that meets your requirements. Going solar offers a host of benefits, from cost savings to environmental sustainability. So why wait? Start exploring the possibilities of solar power today!

If you have any questions about solar power or want to learn more, feel free to reach out to us at Bison Roofing and Solar. We are here to help you on your journey towards clean energy!

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