Solar power systems need to be carefully sized to meet your energy needs, but that requirement goes beyond the number of panels you put on your roof. It also applies to your solar inverter. Inverters are the heart of your solar power system, converting the DC power made by solar panels into the AC electricity your home uses. Choosing the right inverter size is critical for your system to perform as it should. While you might be tempted to save money by purchasing a smaller inverter, doing that can lead to several issues impacting efficiency, reliability, and the long-term value your system offers.
Reduced Energy Production
One of the most common issues with an undersized solar inverter is energy clipping. This happens when the solar panels make more power than your inverter can process. Once the inverter reaches its maximum output, any additional energy your panels make is effectively wasted, “clipped” off, and allowed to burn away as heat.
For example, if your solar panels can make 10 kW of power but you bought a 7.5 kW inverter, the system won’t be able to use the full output of your panels during peak sunlight hours. Over time, this lost energy can add up to a significant reduction in your energy savings.
Increased Wear and Tear
An inverter that’s too small for your system will run at its maximum capacity far more often than one that’s appropriately sized. While high-quality inverters are made to handle heavy workloads, constantly running at full output can place additional stress on internal components.
Excessive strain increases operating temperatures and speeds up normal wear and tear. As a result, your inverter will likely reach the end of its life far earlier than it should, causing you to have to pay for a replacement much sooner.
Limitations on Expansion
Many solar power users decide to expand their systems in the future, but an undersized inverter can create a major roadblock for those expansion plans. If the inverter is already running at its maximum capacity most of the time, adding more solar panels won’t provide you with any benefit. After all, the inverter isn’t capable of processing any additional power. If you want to add more solar panels, you would need to replace the inverter with a larger one first.
Choose the Right Size from the Start
Choosing the right inverter size is incredibly important when you’re designing a solar power system. A properly sized inverter will maximize energy production, reduce stress on equipment, and improve overall system efficiency. Work with an experienced solar professional to ensure that you’re choosing the right Fronius single-phase inverter for your needs.
