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Both Kent hybrid platforms carry an IP66 rating. Understood correctly, that rating is a genuine strength. Misread, it is the root cause of half the siting mistakes that show up in field claims.

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What IP66 means

The two digits in IP66 each describe one class of protection:
DigitValueWhat it means
First (solids)6Dust-tight — fine dust cannot enter the sealed enclosure
Second (liquids)6Protected against powerful water jets from any direction
So yes: monsoon rain hitting the enclosure will not get in — provided the seal system is intact and correctly assembled.

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What IP66 does not protect against

IP is an ingress rating. It says nothing about heat, UV, corrosion, or what accumulates on the outside of the unit.
IP66 protects againstIP66 does nothing about
Dust entering the sealed enclosureDust caking the heatsink fins on the outside, blocking cooling
Rain and water jets hitting the enclosureHeat — direct sun still raises electronics temperature
Splashes and hosingUV ageing of plastics, labels, and cable jackets
—Corrosion — salt mist and ammonia attack metal regardless of IP class
—Steady drips over months and years from a pipe or AC drain overhead
That is why the installation manuals still require shade and no direct rain path even for an outdoor-rated unit. Outdoor-rated is not the same as carelessly outdoor.

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The seal system is only as good as its weakest gland

IP66 is a system rating, not a property of the enclosure alone. It assumes:
  • Factory gaskets are undisturbed
  • Every cable gland is correctly sized for the cable jacket and torqued to grip it
  • Every unused port is sealed with its bung
One open knockout turns IP66 into effectively no protection at all. See Glands & Water Tracking for the correct gland, bung, and drip-loop method.
The commissioning photo set requires a close-up of the gland plate showing every gland torqued and every unused port bunged. Take that photo before the trunking cover goes on — see Site Photo Checklist.

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Indoor vs outdoor units — do not assume

IP66 outdoor-rated units exist alongside indoor-only models (IP2x class) across the market. Never generalise “inverters are outdoor” to other equipment on site, and never assume a customer’s existing unit can share the same wall exposure as a Kent unit. Check the IP class on the nameplate before siting anything.

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Common mistakes

IP is ingress protection, not thermal protection. Direct sun raises the internal and heatsink temperature, triggering derating regardless of whether any water or dust enters. Shade is a performance requirement, not cosmetics.
IP66 permits powerful water jets — it does not permit a directed lance at gasket seams from point-blank range. Keep pressure-washing equipment away from seal lines and gland entries.
An open port is an open port. Cover it with the supplied bung immediately. Monsoon season does not wait for a return visit.