What are the differences in EMC requirements for indoor and outdoor EPS?

The EMC requirements and operating environments differ between indoor and outdoor EPS installations:

1. Environmental Severity: Outdoor EPS faces harsher environments (temperature, humidity, sunlight, pollution), requiring components and materials (such as shielding gaskets and coatings) with better environmental adaptability, and their EMC performance must remain stable throughout their lifespan.

2. Lightning and Surge Risk: Outdoor installations face significantly higher lightning strike risks, therefore their surge protection levels are typically higher than indoor installations, including higher current carrying capacity and more robust protection circuitry.

3. Radio Frequency Environment: Outdoor installations may face more complex radio frequency interference environments, requiring potentially stricter immunity.

4. Grounding: Outdoor grounding usually relies on on-site grounding grids, which may have higher and unstable grounding impedance, having a greater impact on filtering and shielding effectiveness, requiring greater design margins.

5. Standard Differences: Certain specific outdoor applications (such as photovoltaic power plants) may have additional industry EMC standards. Overall, the EMC design of outdoor EPS requires greater robustness.