What are the insulation resistance retention requirements for the common mode inductance of photovoltaic inverters in high humidity environments?

Standard basis: Follow IEC 61215 "Photovoltaic Module Design Qualification and Type Approval". The high humidity test conditions are 85°C/85% RH for 1000 hours. Insulation resistance requirements: Initial value: insulation resistance between input and output ≥100MΩ (500VDC). After humidity aging: insulation resistance needs to remain ≥10MΩ, and there should be no expansion or cracking caused by water absorption of insulating materials. Protective measures: Use epoxy resin potting (such as UL94V-0 grade), and apply a moisture-proof coating (such as Parylene) on the surface of the magnetic core to enhance anti-condensation ability.