Complete guide to earthing for solar panels

When installing a solar panel system, one of the most important aspects to consider is the earthing system. It is an essential component that guarantees the safety of the system and optimises its operation.

In this guide, we will explain how earthing works in solar panels, what type of earthing rod is used, how to install it, and the pros and cons of using a specific rod for solar panels.

How does earthing work in solar panels?

The grounding in a solar panel system serves to divert possible fault currents that may be generated in the system, such as lightning strikes or insulation faults, to earth.

This protects both people and connected electrical equipment. In essence, the grounding acts as an escape route for any unwanted currents, ensuring that the system operates safely and efficiently.

Is a specific ground spike needed for solar panels?

One of the most common questions when installing a solar panel system is whether to use a specific grounding rod for the panels or whether the existing grounding rod in the electrical installation of the house can be used.

The answer depends on several factors, such as local regulations and the characteristics of the installation.In many installations, it is possible to connect the grounding of the solar panels to the house grounding rod. This can be convenient and economical, as it avoids the need to install an additional grounding rod.

However, in other cases, especially in larger installations or in locations with specific ground conditions, it may be advisable or even mandatory to use a separate grounding rod for the solar panels. This ensures more effective protection against faults and can improve the performance of the system.

Advantages and disadvantages of using your own solar panel spike

Advantages

• Increased safety: A separate grounding prong can provide better protection in case of electrical faults or shocks.

• Regulatory compliance: In some areas, it is mandatory to have a dedicated ground spike for solar panels.

• System optimisation: Having a dedicated ground spike avoids overloading the existing ground spike, which could improve system efficiency.

Disadvantages

• Additional cost: Installing an additional ground spike can increase the cost of the installation.

• Space: Requires additional space on the property, which can be inconvenient in small areas.

• Maintenance: An additional ground spike may require more maintenance and supervision.

Schematic diagram of earthing installation

The grounding installation scheme in a solar panel system can vary, but generally follows a standard pattern. These are the basic components of an installation:

1. Solar Panels: The panels are connected to an inverter that converts direct current (DC) to alternating current (AC).
2. Inverter: This equipment is also connected to earth to avoid any risk in case of electrical faults.
3. Junction box: From the junction box, the wiring to the earthing rod is carried out.
4. Earthing rod: The earthing cable is connected to the earthing system, either a separate earthing rod or the house earthing rod.

In this scheme, it is important that all connections are made to the grounding system.

At Sunhero, we are aware of the importance of correct earthing in solar panel installations. For this reason, we evaluate each project individually, considering local regulations and the characteristics of the property, to determine the best solution.

Our team of experts design customised photovoltaic systems and ensure safe and efficient installations, using high quality materials and best practices. If you want to take a step towards solar energy, contact us now!