Does a solar energy system need to be earthed?

The mounting system of solar panels is a metal structure, so you must always bond it. The solar panels themselves are double insulated, meaning they do not need additional bonding.

The NEN 1010 standard requires equipotential bonding (earthing) of a PV system. As an installer, you must ensure that the mounting system is properly earthed.

Video: equipotential bonding of solar panels

Do you want to know exactly what a PV installation must comply with? According to NEN 1010, there are clear regulations. In this video from ISSO, you will learn how to apply the standards in practice, with clear examples from the ISSO manual “Solar Energy.” Pay special attention to the part between 6:00 and 7:00 minutes.

We distinguish four types of bonding:

1. Functional earthing: earthing of the positive or negative conductor for thin-film panels or back-contact panels to prevent voltage corrosion.
2. Protective earthing: earthing to ensure electrical safety.
3. Surge protection: earthing to protect system components against overvoltage from lightning strikes.
4. Lightning protection: earthing the structure when using an external lightning protection system.

When should you bond solar panels?

You must bond solar panels in the following situations:

• The panels are placed less than 60 cm from a lightning protection system.
• You are using a transformerless inverter.
• The installation contains large metal structures with solar panels.
• Dangerous situations may occur due to startle reactions.

Technical requirements

The grounding cable must have at least the same diameter as the largest cable in the AC or DC system. Always consult the ISSO manual or NEN 1010 for detailed guidelines.

Proper bonding increases safety, prevents damage, and extends the lifespan of the installation. Therefore, always follow the applicable standards and guidelines for a reliable and safe PV system.