> ## Documentation Index
> Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt
> Use this file to discover all available pages before exploring further.

# IP66 Rating — What It Means and What It Does Not

> What IP66 actually protects on Kent inverters, the five threats it never addresses, and why the complete seal system depends on every single gland.

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.

## What IP66 means

The two digits in IP66 each describe one class of protection:

| Digit            | Value | What it means                                                |
| ---------------- | ----- | ------------------------------------------------------------ |
| First (solids)   | 6     | **Dust-tight** — fine dust cannot enter the sealed enclosure |
| Second (liquids) | 6     | **Protected 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.

## What IP66 does not protect against

<Warning>
  IP is an **ingress** rating. It says nothing about heat, UV, corrosion, or what accumulates on the outside of the unit.
</Warning>

| IP66 protects against                     | IP66 does nothing about                                                   |
| ----------------------------------------- | ------------------------------------------------------------------------- |
| Dust entering the sealed enclosure        | Dust **caking the heatsink fins** on the outside, blocking cooling        |
| Rain and water jets hitting the enclosure | **Heat** — direct sun still raises electronics temperature                |
| Splashes and hosing                       | **UV** 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.

## 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](/environment/glands-and-water-tracking) for the correct gland, bung, and drip-loop method.

<Note>
  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](/environment/site-photo-checklist).
</Note>

## 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.**

## Common mistakes

<Accordion title="Quoting 'IP66, it can take the sun'">
  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.
</Accordion>

<Accordion title="Pressure-washing the unit during façade cleaning">
  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.
</Accordion>

<Accordion title="Leaving a removed gland open 'until the extra cable arrives'">
  An open port is an open port. Cover it with the supplied bung immediately. Monsoon season does not wait for a return visit.
</Accordion>

## Related pages

* [Choosing the Location](/environment/choosing-the-location)
* [Glands & Water Tracking](/environment/glands-and-water-tracking)
* [Rain, Dust & Monsoon](/environment/rain-dust-and-monsoon)
* [Site Photo Checklist](/environment/site-photo-checklist)