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what do IP65, IP67, and IP68 protection ratings mean
IP67 and IP68 mean:
- IP refers to Ingress Protection,
- 6 stands for Dust-proof and
- 7 for Temporary immersion, 15 cm to 1m, and
- 8 for Permanent Immersion, under pressure
A solar panel junction box with an IP65 rating will provide complete protection against dust and cannot be damaged by low-pressure water jets. There may be limited ingress inside, but it stops the component from properly functioning.
A solar junction box with an IP67 rating is completely protected from dust and will properly functional after Temporary immersion in water (up to 1m deep).
A PV junction box with an IP68 is completely protected from dust and cannot be damaged by immersion in water deeper than 1m.
A quality solar panel junction box is certified (IEC61250, IEC61730, and UL1703).