An IP rating (Ingress Protection rating) tells you how well a device is protected against solid particles like dust and against water. The two digits after "IP" indicate dust resistance (0 to 6) and water resistance (0 to 9K). For outdoor power equipment, IP54 or higher is generally recommended for reliable use in typical UK weather conditions.
When buying solar panels, power stations or accessories for outdoor use, you will often see IP ratings listed in the specifications. Knowing what these mean helps you choose equipment that will withstand the conditions you plan to use it in, rather than discovering the hard way that your kit is not as weather-resistant as you assumed.
How IP Ratings Work
IP ratings are defined by the international standard IEC 60529. The format is always "IP" followed by two digits:
- First digit (0 to 6): Protection against solid objects and dust
- Second digit (0 to 8, plus 9K): Protection against water
A higher number means greater protection. If a digit is replaced by "X", that aspect has not been tested or rated.
Dust Protection (First Digit)
| Rating | Protection Level |
|---|---|
| 0 | No protection |
| 1 | Protected against objects larger than 50mm (e.g. a hand) |
| 2 | Protected against objects larger than 12.5mm (e.g. fingers) |
| 3 | Protected against objects larger than 2.5mm (e.g. tools) |
| 4 | Protected against objects larger than 1mm (e.g. wires) |
| 5 | Dust protected (limited ingress, will not cause harm) |
| 6 | Dust tight (no ingress) |
Water Protection (Second Digit)
| Rating | Protection Level |
|---|---|
| 0 | No protection |
| 1 | Protected against vertically falling water drops |
| 2 | Protected against water drops at up to 15 degrees from vertical |
| 3 | Protected against spraying water at up to 60 degrees from vertical |
| 4 | Protected against splashing water from any direction |
| 5 | Protected against water jets from any direction |
| 6 | Protected against powerful water jets and heavy seas |
| 7 | Protected against temporary immersion in water (up to 1 metre for 30 minutes) |
| 8 | Protected against continuous immersion (to manufacturer-specified depth) |
Common IP Ratings and What They Mean in Practice
IP44
Protected against solid objects larger than 1mm and splashing water from any direction. Suitable for sheltered outdoor use where rain may reach the device but no direct water jets.
IP54
Dust protected and splashing water resistant. A good minimum for outdoor power equipment used in typical UK weather. The device can be rained on from any direction without damage.
IP65
Fully dust tight and protected against water jets. Suitable for use in heavy rain, near garden hoses or in dusty environments such as building sites.
IP67
Fully dust tight and can be temporarily submerged to 1 metre for 30 minutes. Common in outdoor lighting and equipment used near water.
IP68
Fully dust tight and submersible beyond 1 metre. The highest practical rating for consumer equipment. Suitable for underwater use within the manufacturer's specified limits.
IP Ratings for Specific Equipment
Solar Panels
Most rigid solar panels have an IP67 or IP68 rating at the junction box. The panel itself is designed for permanent outdoor exposure. Foldable camping panels typically have lower ratings, often IP54 to IP65, and should not be left out in heavy rain for extended periods.
Portable Power Stations
Most portable power stations are not rated for water exposure and should be kept dry during use and storage. Some ruggedised models carry an IP54 or IP65 rating, allowing use in light rain. Always check the specification before using outdoors in wet conditions.
Charge Controllers and Inverters
Wall-mounted charge controllers and inverters are typically IP20 or unrated, meaning they are for dry indoor use only. Outdoor or weatherproof variants with IP65 ratings are available for exposed installations.
Important Limitations
An IP rating is achieved under laboratory test conditions. Real-world performance can vary. High-pressure washing, saltwater exposure, prolonged submersion beyond tested limits and physical damage to seals can all reduce effective protection. IP ratings also do not account for condensation forming inside an enclosure when temperature changes rapidly.
