An EV charging pile enclosure has to do three jobs at once, and they pull against each other: keep water out, get heat out, and stay standing in a public space day after day. The power rating decides which of the three dominates. At 7 kW AC the enclosure is mostly a sealed, weatherproof box with a cosmetic face. At 60–120 kW DC it becomes a thermal and structural problem, where the sealed-versus-vented trade-off has to be settled before the first panel is cut.
Key takeaways
- Power class sets the design problem. A 7 kW AC wallbox is dominated by ingress and cosmetics; a 60–120 kW DC cabinet by heat rejection, cable management and structure. Do not reuse one enclosure architecture across both.
- IP54 to IP55 for sheltered kerbside, IP65 where the site is hosed or takes driven rain, IP66 plus a corrosion specification on the coast. The rating and the corrosion specification are two lines, not one.
- Airflow and ingress pull in opposite directions. Decide the vent area the thermal model needs first, then buy the IP rating that the vent, the drain and the gland can actually hold.
- Most field failures are not rating failures. They are gasket compression at latch points, unrated cable glands, and condensation on the inside of the lid.
- We fabricate the enclosure; we do not certify the charger. IK impact testing, electrical safety and product certification belong to your compliance path, not to the sheet metal drawing.
What does an EV charging pile enclosure actually have to do?
It holds the charger's power modules, control board, metering, cable management and connectors — and it does three things that compete:
- Keep water and dust off live parts. Rain, wind-blown dust, hose-down at a forecourt, and the water that runs down the charge cable itself.
- Get heat out. Power conversion produces real heat, and in a sealed box in afternoon sun the internal temperature is the difference between a product that lasts and one that throttles.
- Survive the public realm. Impact, vandalism, UV, salt in winter, and a service technician who will open it in the rain and needs to close it again.
Sealing harder helps the first and hurts the second. Cutting more vent area helps the second and hurts the first. Adding a sunshade helps the second and costs you a bracket and a fixings pattern. Every charging enclosure is a settlement between these three, and the settlement is different at every power level.
How does the power rating change the enclosure design?
This is the first question to answer, because it fixes the volume, the thermal strategy and the structure before any detail is drawn. The table below sets out the classes we see in RFQs most often. Where we have a production shell in that class we have linked it; the other rows describe typical market classes rather than our catalogue.
| Power class | Typical form | What dominates the enclosure design | Thermal approach | Ingress target | Structure & hardware notes |
|---|---|---|---|---|---|
| 3.7–7 kW AC (single-phase, ~32 A) | Wallbox or slim pedestal | Cosmetics, sealing and cable storage. Heat is modest. | Natural convection through screened vents or the enclosure skin itself. | IP54 sheltered; IP55–IP65 exposed | Wall bracket or pedestal base, hinge plus latch, cable holster. See our 7 kW / 32 A AC charger enclosure. |
| 11–22 kW AC (three-phase) | Pedestal or wall-mounted | Metering space, contactor and protective-device heat, cable management. | Forced convection in most designs; filtered intake. | IP55 | Heavier pedestal base, lockable service door, room for a meter and a terminal rail. |
| 30–60 kW DC | Floor-standing, single gun | Power modules set the internal volume. | Forced air with filtered intake and a directed exhaust path. | IP54–IP55 | Module shelves or slides, lift points, earthing studs, a base that survives being set down on an uneven pad. |
| 60–120 kW DC | Floor-standing, dual gun | Heat rejection, cable weight and frame stiffness. | High-flow forced air with hot-aisle routing; a sunshade is usually worth costing. | IP55 | Reinforced frame, dual cable management, heavy base, bonded door. See our 60–120 kW DC fast charger enclosure. |
| 240 kW and above / hub architecture | Power cabinet plus separate dispenser(s) | Splitting the power stage away from the user interface. | Cabinet: high-flow air or liquid. Dispenser: convection. | IP55 cabinet; IP54–IP65 dispenser face | Two enclosures, two specifications and one interconnect — the interface between them is where projects slip. |
Two patterns are worth reading out of that table. The thermal approach changes before the form factor does, which means the vent and filter provisions — not the outline — are what you should freeze first. And above roughly 60 kW the cable, not the electronics, starts to set the structure: a heavy liquid-cooled or high-current cable hanging off one side applies a real moment to the frame, and the anchor point has to be designed for it rather than added afterwards. Our EV charger enclosure procurement guide walks through the sourcing side of the same decisions.
Which IP rating does an EV charger enclosure need?
IP codes are defined in IEC 60529 and cover ingress only — solids and dust in the first digit, water in the second. They say nothing about corrosion, impact or UV, which is why the "specify alongside" column below is not optional.
| Site | Rating we would specify | Why | Specify alongside it |
|---|---|---|---|
| Covered car park or indoor bay | IP54 | Splash only. Here ventilation and vandal resistance matter more than ingress. | Filtered vents, lockable service access, cosmetic class on the visible face. |
| Sheltered kerbside under a canopy or forecourt roof | IP54–IP55 | Rain and light rinsing; the canopy does most of the work. | Drain path at the base, breather vent rated to match. |
| Exposed urban kerbside (the common case) | IP55 | Wind-blown dust plus a water jet — covers driven rain and a hose. | Gasket material and compression hardware; cable glands rated to match. |
| Coastal or winter-salt site | IP66, plus 316 stainless or a marine-grade coating system | Driven salt spray behaves like a continuous jet, and salt is what kills the shell. | Substrate, pretreatment and coating as an explicit line, with salt spray evidence. See our coastal charger material study. |
| Routine hose or pressure-wash cleaning | IP66 | The IPX6 jet is the test that matches hose cleaning. | Glands, vents and drains rated to match the shell. |
| Low-lying pad that can hold standing water | IP67, or a dual IP66/IP67 | Immersion, not jets. IP67 contains no jet test at all. | Declared depth and duration on the datasheet; raised base or plinth. |
The decoding of these digits — including why IP67 does not imply IP66 and why an unqualified IP68 claim is incomplete — is set out in our outdoor waterproof enclosure IP guide. If you also sell into North America, note that NEMA types and IP codes are not interchangeable: a NEMA type number bundles corrosion and icing requirements the IP code does not cover.
How do you cool a sealed charger enclosure without losing the rating?
This is the argument at the centre of every DC charger enclosure, and the order of operations matters. Start from the heat, not from the rating:
- Establish the heat to reject from your power stage and your worst-case ambient. That is your number, not ours.
- Remove what you can before it enters the box. A sunshade over the pile takes solar load off the shell before it becomes an internal air problem, and it is usually cheaper than the airflow needed to do the same job (see our sunshade and hood design guide).
- Decide the vent area and route. Intake low and filtered, exhaust high, and never discharging onto the user or the cable holster. Open area and hole pattern are sized from the airflow target — see the perforated vent pattern guide.
- Then buy the IP rating the vent can hold. A rated breather vent or a drain plug at the lowest point keeps liquid water out while letting pressure equalise. The failure mode to avoid is fitting a vent rated below the enclosure — that component becomes the enclosure's real rating.
Where the thermal model cannot be met with filtered air, the options are a sealed internal loop with an air-to-air heat exchanger, or a liquid path to a remote radiator. Both keep the rating intact because both keep the outside air outside; both cost more and add penetrations. Our thermal management guide and ventilation guide cover the geometry, and the condensation control guide covers what happens when a sealed box meets a cold wet night — which is the failure nobody models and everybody sees in the field.
What makes a public-space charger enclosure survive impact, vandalism and daily use?
None of this is in the IP code. Impact resistance has its own scale, the IK code defined in IEC 62262, and it is a separate line on the specification — an enclosure with no IK requirement has not been impact tested at all. IK10 sits at the top of that scale; what level you need depends on the site rather than on the product, and it is worth asking your insurer before you ask your fabricator (see our IK rating guide).
The rest is hardware and detail. Hinges and latches carry the door every day for a decade, and that is a specification in its own right rather than a catalogue pick (see the hinge and latch hardware guide). Recessed or tamper-resistant fasteners, a lock that survives being forced in the rain, and a door stiff enough not to bow between latch points all matter. For exposed unattended sites, our vandal resistant design guide goes through the details that actually change outcomes.
Earthing is the one that gets missed. A powder-coated door on a powder-coated frame does not make a bonding path. Grounding continuity has to be designed in — a stud, a bonded hinge, a toothed washer at a defined location — and it belongs on the drawing, not in the assembly note. See our grounding and bonding guide.
Which materials and finishes hold up on a kerbside site?
Most charging enclosures are cold-rolled steel for strength and cost, with galvanized or stainless steel where corrosion governs and aluminium where weight does. The pattern we see:
- Cold-rolled steel + powder coating — inland, sheltered and cost-driven sites. The corrosion resistance lives in the pretreatment and the coating system, not in the steel.
- Galvanized steel — humid inland and general outdoor. Zinc protects the cut edges and the scratches that a kerbside site will produce.
- Stainless 304 — washdown, food-adjacent and most industrial atmospheres; no coating to chip.
- Stainless 316 — coastal air and winter de-icing salt, where chlorides are present. It is the molybdenum-bearing grade and the one to specify when the site is within sight of the sea.
- Aluminium — where lift weight or a wall-mount bracket governs, with attention to stiffness and to galvanic contact against steel fixings.
Whichever substrate you choose, the finish is a system — pretreatment, coating and cure — and the common failure is specifying "powder coated" and expecting the coating to compensate for a substrate that was wrong for the site. Our material selection guide and corrosion resistance and coatings guide cover the trade-offs; the salt spray testing guide explains how coating claims are evidenced. On a branded product, also decide which faces carry which cosmetic class — a charger that only ever shows its front does not need an A-class finish on all six sides (see the cosmetic surface class guide).
How is a charging pile enclosure built, and which steps decide the outcome?
Through the same controlled sequence as any sheet metal assembly: DFM review, laser cutting, CNC bending, forming, welding, grinding and deburring, hardware insertion, powder coating, assembly and inspection — set out in full in our nine-step fabrication process. Four steps decide whether the rating survives production. Welding and grinding decide whether seams can be sealed at all. Deburring decides whether gaskets seat — a burr under a gasket is a leak. Bending accuracy decides whether the door compresses the gasket evenly along its whole length. Assembly decides whether the specified glands, latches and earth hardware are fitted and torqued.
That last point is where kerbside products usually fail. A cabinet designed to IP66 and assembled with one unrated cable gland is not an IP66 cabinet; the assembly is only as good as its weakest rated component. Cable entry is worth specifying explicitly rather than leaving to the installer — see our cable gland selection guide.
What should go on the RFQ?
Put the three duties on the request as separate requirements. Then add:
- Power class and the heat to reject, with the ambient you designed to.
- Material, pretreatment and coating as separate lines, with the salt spray or equivalent evidence you need.
- The rating, the standard and the edition — tested on the complete assembly with production gasket, glands and door hardware fitted, evidenced by a report with photographs.
- IK level and the hardware specification — hinges, latches, lock, earthing provisions.
- Which faces carry which cosmetic class.
SanJun runs nine processes in-house across a 5,000 m² facility under ISO 9001 and ISO 14001, with RoHS and REACH compliance, a one-piece minimum order and free CAD and DFM review. Standard parts ship in 7–15 working days and custom builds in 20–30 days; sample lead time is quoted by complexity rather than as one headline number, because a flat sample panel and a welded, coated prototype cabinet are different jobs. See our EV charging enclosures for the range we build, our enclosure lead time guide for what moves the schedule, and the custom enclosure cost guide for what moves the price.
Frequently Asked Questions
Is IP65 enough for an outdoor EV charger?
For most exposed kerbside sites, yes — IP65 covers rain, wind-blown dust and hose-down, which is what a charger on a street actually faces. Step up to IP66 where the site takes driven salt spray or is routinely pressure washed, and only consider IP67 where the pad can hold standing water — and remember that IP67 is an immersion test with no jet test, so where a site faces both, specify a dual rating such as IP66/IP67. If the site is coastal, the rating is the easy half: the corrosion specification is the half that decides service life.
Does a higher IP rating make the charger more reliable?
Not necessarily, and pushing the rating without touching the thermal design is a common way to make a charger less reliable. Sealing harder traps heat and traps moisture — the condensation that forms on the inside of a lid on a cold night is a failure mode that a higher IP rating does nothing about and can make worse. There is a second trap: an enclosure is rated as an assembly, so its real rating is the rating of its weakest component. One unrated cable gland turns an IP66 cabinet into an unrated cabinet.
Can a sealed enclosure still be cooled?
Yes, but not with outside air. The options are a sealed internal loop with an air-to-air heat exchanger on the shell, or a liquid path to a remote radiator. Both keep outside air out and so keep the rating intact; both cost more and add penetrations that have to be sealed. Before paying for either, cost the passive options: a sunshade to take the solar load off the shell, a filtered vent with a rated breather, and an internal layout that does not trap the heat where the modules are.
Do I need an IK rating, and what is it?
You need one if the charger can be struck, kicked or hit by a vehicle, and an IP rating does not cover it. IK is the impact protection code defined in IEC 62262 and it is a separate line on the specification: an enclosure quoted without an IK level has not been impact tested. IK10 sits at the top of the scale. Which level you need is a site and insurance question rather than a fabrication question, so settle it before the drawing is frozen rather than after the first unit is damaged.
Galvanized steel or 316 stainless for a coastal charger?
It depends on how close to the sea and on the service life you are selling. Galvanized steel adds sacrificial protection at cut edges and scratches at modest cost and suits most general outdoor and humid inland sites. Where chlorides are present — coastal air, winter de-icing salt — 316 stainless is the specification, because it is the molybdenum-bearing grade. Powder-coated carbon steel is the option we would argue against on a seafront. Our coastal charger material study works through the same decision with numbers.
Does powder coating alone stop corrosion?
No. Coating is a system — pretreatment, coating and cure — and it protects a substrate, it does not replace one. A scratched powder-coated carbon-steel enclosure on a coastal site rusts at the scratch, and a coating applied over poor pretreatment fails at the edges long before it fails in the middle. Specify substrate, pretreatment, coating system and the evidence you want (a salt spray result, for example) as separate line items, and choose the substrate for the site first.
How do cables enter without breaking the rating?
Through a gland or conduit entry rated to at least the enclosure's own level, matched to the cable diameter, on a flat entry plate that stays flat when the gland is torqued. The charge cable itself deserves the same attention: it carries water into the holster and applies a real moment to the frame, so the anchor point and the drain path are design items. See our cable gland selection guide.
What is the lead time, and what is the minimum order?
Minimum order quantity is one piece, and CAD and DFM review are free. Standard parts ship in 7–15 working days and custom builds in 20–30 days. Sample lead time is quoted by complexity rather than as one headline number — a flat sample panel, a welded frame and a fully coated prototype are three different jobs with three different schedules. The fastest route is usually to send the model and let us come back with a manufacturability note before you freeze the drawing.
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The payment and status screen faces sun, impact and cleaning at once; material, thickness and sealing for that one square are set out in our enclosure viewing window glazing guide.
The industry constraints behind this design, and the commercial side of buying it, are collected in the applications and sourcing cluster.