Do Solar Panels Make Noise?

As solar panels become increasingly popular, there are plenty of assumptions and questions surrounding these systems. One frequently asked question is whether solar panels make any noise. It's only natural to consider this if you're planning to have a system installed on your roof. The short answer is no—solar panels themselves typically don't produce any noticeable noise. They are specifically designed to operate quietly, even during the day under direct sunlight. Panels equipped with moving parts are also engineered to minimize any sound production, ensuring a peaceful and quiet setup both day and night.

That said, there could be some exceptions. Occasionally, you might notice a very faint hum from your solar panels during the day when they're actively converting sunlight into energy. This hum is usually minimal and difficult to detect unless you're standing relatively close to the panels—within about 50 feet. Still, it’s generally not something that would disrupt your daily life or even catch your attention unless you're specifically listening for it.

Why Do Solar Panels Make Noise?

While solar panels themselves are generally quiet, there are a few reasons why you might hear some low-level noise:

Inverter Humming

The humming sound often associated with solar panels doesn't actually come from the panels themselves but rather from the inverter. The inverter plays a crucial role in converting the direct current (DC) electricity generated by the panels into alternating current (AC), which powers your home appliances. Not all inverters hum; the likelihood depends on the inverter's quality and brand. String inverters, which are the most common type, are known to produce a humming noise, though it rarely exceeds 45 decibels—hardly enough to disturb your peace. If the noise bothers you, placing the inverter in an enclosed space can help reduce it. Microinverters, on the other hand, tend to be quieter, and if you notice any unusual noise, it’s worth reaching out to the installer or manufacturer for assistance.

Inverter Fans

If your inverter is exposed to direct sunlight or if your household requires a lot of electricity, it might activate its cooling fan. While this fan can generate some low-level noise, it should be fairly subtle. For optimal performance, it’s ideal to install the inverter in a cool, shaded area where it can function without additional cooling mechanisms.

Loose Cabling

Your solar system will have wiring connecting the panels to the roof. If this wiring isn't properly secured, it can shift in the wind and create noise. Fixing this issue is usually a simple task, but if you suspect this is causing the noise, it’s best to consult a professional to ensure everything is secure and safe.

Loose Racking

Another potential source of noise is loose racking. If the mounting hardware hasn’t been installed correctly or has loosened over time, you might hear a rattling sound. Wind can exacerbate this issue, causing the panels to move around, shake, or even detach. If you think this might be the problem, contact your installer to inspect and fix the issue. Properly securing the panels should resolve the rattling sound.

Wind Noise

Even though solar panels are designed to be silent, you might still hear some sounds, especially at night when it's quieter outside. These noises are usually caused by the wind. Depending on how your panels were installed, wind can flow through small gaps, producing a whistling sound. While it might sound like objects are moving, it’s typically just the wind traveling through spaces that didn't exist before the panels were installed. As long as your panels are securely mounted, this shouldn’t be a major concern.

Detecting Solar Panel Noise

If you're unsure whether your solar panel system is making noise, the simplest way to check is at night. Your inverter remains active at night, but it’s primarily gathering data rather than actively converting energy. By eliminating the inverter as the source of the noise, you can focus on identifying whether the noise is coming from the panels themselves. Loose cabling, loose racking, or wind could be contributing factors.

In conclusion, aside from a faint humming sound from the inverter or noise from the wind, your solar panels should operate almost silently. If you do hear any noise that doesn’t seem to originate from the inverter or wind, it’s advisable to have your system inspected to prevent future issues. Ready to embark on your solar panel journey? Let’s work together with a team of experts to get you started. Get in touch with us today!