How can you ensure that a solar PV system is resistant to electromagnetic interference?

1 What is EMI and why does it matter?

EMI is a form of noise that can interfere with the signals and circuits of a solar PV system. This type of noise can originate from natural sources, such as solar flares or lightning, or from man-made sources, such as power lines, transformers, or wireless devices. EMI can have adverse effects on a solar PV system, such as reducing its output power or efficiency, causing errors in the monitoring or control systems, damaging components or wiring, and creating safety hazards or fire risks due to arcing or overheating. To ensure your solar PV system is resistant to EMI and compliant with the relevant standards and regulations, it's important to take the necessary precautions.

2 How to design a solar PV system for EMI resistance?

Designing a solar PV system to have high EMI resistance requires careful consideration of the layout, orientation, configuration, and grounding of the system's components. To reduce EMI exposure and vulnerability, you should avoid parallel or close proximity of the AC and DC wiring, as this can create unwanted coupling or induction of noise. Shielded or twisted pair cables for the DC wiring can reduce radiated or conducted noise, while filters or surge protectors for the AC wiring can prevent noise from entering or leaving the system. Additionally, select high-quality and compatible components that have low EMI emissions and high EMI immunity. Orienting the solar modules away from sources of EMI, such as power lines or antennas, can also be beneficial. Finally, make sure to ground the solar PV system properly and according to local codes to provide a low-impedance path for noise to dissipate.

4 How to maintain a solar PV system for EMI resistance?

The EMI resistance of a solar PV system is heavily influenced by its maintenance. To keep your system in good condition and performance, you should check the solar modules for cracks, dirt, or shading; clean them with water or mild detergent; inspect the inverters for signs of overheating, corrosion, or damage; clean the inverters with compressed air or soft cloth; examine the wiring and components for any loose, worn, or broken connections or insulation; and repair or replace any faulty or damaged wiring or components. Following these design principles, best practices, and maintenance tips can help you ensure that your solar PV system is resistant to EMI and operates optimally and safely.

5 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?