Enclosures & Weatherproofing¶

How to keep outdoor nodes alive and reliable through weather, temperature swings, and years of exposure.

Enclosure selection¶

IP ratings¶

The IP (Ingress Protection) rating tells you how well a housing resists solid particles and water. For outdoor nodes:

For most repeater deployments, IP65 is the minimum for any exposed outdoor mounting. IP66 is better near the coast or in high-rainfall areas.

Material¶

• Polycarbonate (PC): impact-resistant, UV-stable if UV-inhibited grade is used. Most DIY enclosures on the market. Verify UV rating — cheap PC yellows and cracks within 12–18 months of direct sun exposure.
• ABS: lighter and cheaper than PC, but less impact-resistant and more prone to UV degradation. Acceptable for sheltered locations.
• GRP/fibreglass: very durable, used in professional telecom enclosures. Higher cost but excellent long-term performance.
• Aluminium/steel: excellent for mechanical protection; adds weight and risk of detuning nearby antennas. Ensure antenna is mounted with sufficient standoff from any metal surfaces.

Gasket quality¶

A failed gasket defeats even the best enclosure rating. Check: - Gasket is fully seated in the groove before closing - No nicks, cuts, or deformation in the gasket material - Closure screws or latches torqued evenly (do not over-torque)

Re-inspect the gasket annually. Silicone gaskets last 5–10 years. Foam or rubber gaskets degrade faster in UV and heat.

Cable entry¶

Cable glands¶

Every cable entering the enclosure needs a properly sized cable gland (also called a cable transit):

• Match gland size to cable OD (outside diameter); too large allows water ingress, too small may damage the cable jacket
• Use glands rated to at least IP68 for the junction itself
• For coax, use glands sized for the connector body rather than passing bare coax through and reconnecting inside
• Tighten glands fully; hand-tight is usually not enough

Unused knockout holes¶

Seal any unused knockout holes with a solid IP-rated blanking plug. Water always finds the path of least resistance.

Drip loops¶

Where cable enters from overhead or from a run that is not self-draining: - Form a drip loop — a downward curve in the cable below the entry point — so water drains off the loop rather than running down into the gland - The drip loop should extend at least 20 cm below the entry point

Moisture control inside the enclosure¶

Even with a perfect seal at installation, thermal cycling causes the air inside to expand and contract, pushing moisture in over time through micro-imperfections. Manage this actively:

Desiccant packs¶

• Place a silica gel desiccant pack inside every sealed enclosure at installation
• Use indicating gel (colour-change type) so you can visually check saturation status without opening the enclosure unnecessarily
• Replace or regenerate desiccant packs annually, or when the indicator shows saturation
• Sizing: 5–10 g per litre of enclosure volume is a reasonable starting point

Vent plugs (Gore-type or equivalent)¶

For enclosures larger than ~2 L or those subject to large daily temperature swings, a vent plug equalises pressure without allowing liquid water entry: - IP-rated vent plugs allow air exchange while repelling water - Prevents pressure differential from forcing water through gasket seams - Used in conjunction with, not instead of, desiccant

Thermal management¶

Electronics fail faster at elevated temperatures. The inside of a sealed enclosure in direct sun can reach 60–80 °C in summer — well above the rated operating range of most ESP32 or nRF52 modules (typically derated to +70 °C in practice).

Positioning¶

• Avoid direct sun exposure on the face of the enclosure. Mount with the lid facing away from solar noon (face north in the southern hemisphere, face south in the northern hemisphere).
• Mount under an eave, overhang, or shade structure where possible.
• Lighter-coloured enclosures reflect more solar radiation than dark ones.

Passive ventilation¶

• If your IP rating requirements permit it, vent plugs significantly reduce peak internal temperature by allowing convective air movement.
• Some enclosures have internal fins or perforated inner trays to improve air circulation without compromising the external seal.

Temperature monitoring¶

• If your hardware supports it (e.g., ESP32 with a BME280 sensor or internal thermistor), log internal temperature as part of telemetry.
• Set an alert threshold (e.g., >65 °C) to identify thermal problems before they cause hardware failure.

Connector weatherproofing¶

Outdoor RF connectors are a common failure point. Water ingress at a coax connector causes rapid corrosion, impedance mismatch, and eventually complete failure.

• Self-amalgamating tape: wrap all outdoor SMA, N-type, or BNC connections. Apply from below the connector upward (overlap each wrap 50%) and extend 2–3 cm past the connector body on each side. Self-amalgamating tape fuses to itself and forms a waterproof seal.
• Pre-made weatherproof boots: some connector types have clip-on weatherproof covers. These are faster to install but less reliable than tape for long-term outdoor use.
• Corrosion protection: use a dielectric grease or RF-safe corrosion inhibitor on threaded connections before assembly, particularly in coastal or high-humidity environments.

Common failure modes¶

Related pages¶

• Antenna & RF Basics
• Power & Solar
• Build Guides
• Community Rules & Safety