Moisture ingress in solar modules can lead to significant performance degradation and damage over time. Preventive maintenance to mitigate this involves several strategies to ensure long-term durability and efficiency.

• Use high-quality encapsulants: EVA (ethylene vinyl acetate) or PVB (polyvinyl butyral) are common materials used in encapsulating solar cells, preventing moisture penetration.
• Ensure proper lamination: During the lamination process, ensure that there are no air bubbles or gaps in the encapsulant, as these can become entry points for moisture.
• Seal edges with UV-stabilized sealants: The edges of the module should be sealed using a durable material to prevent water entry over time.

• Check for signs of delamination: Regular inspections should focus on any visible signs of delamination or cracks in the module surface, which can allow moisture ingress.
• Clean solar panels properly: Use non-abrasive methods to clean panels, avoiding pressure that could compromise seals or cause micro-cracks.

• Ensure a well-sealed frame: The aluminum frame should be corrosion-resistant and properly sealed to prevent moisture from reaching the module's edges.
• Inspect junction boxes: These are critical points for moisture ingress. Ensure that junction boxes are well-sealed and that cable connections are secure and water-resistant.

• Tilt the panels: Install solar modules with a slight tilt to allow water runoff, reducing the chance of water pooling on the surface.
• Use waterproof mounting hardware: Ensure that all bolts, screws, and other mounting equipment are rust-resistant and watertight.

• Consider anti-reflective coatings with moisture-resistant properties: Some coatings not only reduce glare but also provide a barrier to moisture.
• Utilize drainage systems: Implement proper drainage around the solar module installation area to direct water away from the panels.

• Monitor local humidity levels: In high-humidity environments, modules should be specifically designed with higher moisture resistance, using enhanced sealing techniques and materials that perform well under these conditions.

Regular maintenance and monitoring of solar modules will help in identifying any potential ingress points early on, thus prolonging the lifespan and efficiency of the solar energy system.