No housing material is best for every EV charger — the right one fits the life the unit will lead. Polycarbonate (PC) brings impact strength, ABS brings low cost and easy moulding, blends and ASA answer the sunlight problem, and aluminium brings rigidity and heat conduction. The mistake is trusting the family name: UV resistance lives in the exact resin grade and finish, so ask for the grade and its weathering evidence.
Key Takeaways
- PC leads on impact, ABS on cost, ASA and stabilised grades on sunlight, aluminium on rigidity and heat.
- UV resistance belongs to the exact resin grade and finish — the family name proves nothing.
- Ask for the grade, the UV package, weathering evidence and flammability evidence as one document set.
- EVDANCE listings state IP ratings, not housing materials — material is a written-confirmation item on an order.
What Each Material Brings
| Material | Strengths | Watch points |
|---|---|---|
| Polycarbonate (PC) | Very high impact resistance; good heat tolerance; the default for knock-prone housings | Needs a UV-stabilised grade or coating for long sun exposure; resin costs more than ABS |
| ABS | Easy to mould, good surface finish; lowest cost of the group | Impact and heat performance below PC; poor sunlight resistance unless stabilised or painted |
| PC/ABS blend | The middle path — better impact and heat than ABS, easier moulding than straight PC | UV behaviour still depends on the grade and cap layer, not the blend name |
| ASA | Formulated for outdoor colour retention; often the weather-facing cap | Usually part of a construction, not the whole housing; confirm what sits underneath |
| Aluminium (die-cast) | Rigid; conducts heat away from the electronics; a premium, serviceable feel | Heavier; needs corrosion protection such as powder coating; dents where a polymer flexes |
UV Resistance Is a Grade, Not a Family Name
Sunlight attacks polymers at the surface: ultraviolet breaks the molecular chains, and the results are yellowing, chalking and a brittle, micro-cracked surface. The defences are well known — UV stabiliser packages compounded into the resin, dark pigmentation, an ASA cap layer, or paint and powder coat. Two housings can both be honestly labelled “ABS” and have completely different outdoor lives, because the label names the polymer family, not the stabiliser package.
So the buyer’s questions are about evidence, not adjectives:
- The exact resin grade named in the specification, with its datasheet.
- The UV package — stabilised resin, cap layer or coating — stated for that grade.
- Weathering test evidence for the finished housing material, not just the raw resin brochure.
- Flammability rating evidence for the same grade — a separate property, and part of the same document request.
Matching Material to the Product’s Life
Work backwards from the use. A portable charger is carried, dropped and knocked against the car — impact behaviour leads, which points to PC or a PC blend. A wallbox hangs on an exterior wall for years in full sun — the UV package and heat behaviour lead, whether the shell is stabilised polymer or coated metal. A floor-standing station needs rigidity, service doors that stay true, and a path for heat to leave the electronics — why larger units are often metal structures with polymer covers. Where the unit will live is the judgement covered in our guide to choosing an outdoor enclosure, and the sealing side is graded separately — see IP ratings compared.
What EVDANCE Listings State — and What to Confirm
EVDANCE product pages state each model’s sealing, not its housing material. The EV-ACT5006T wall charger is listed at up to 48 A with an IP65/IP66 rating and ETL, FCC and CE; the EV-ACS4005T portable at 9.6 kW with IP66. Neither page names a housing polymer or UV package — so on a purchase or private-label order, the material, the exact resin grade and its weathering evidence are written-confirmation items, as a factory audit checks them. Raise them through the OEM and private-label programme or contact us.
Frequently Asked Questions
Is aluminium always better than plastic for a charger housing?
No. Aluminium is rigid and sheds heat, but it is heavier, costs more, and dents where a polymer flexes and recovers. A carried portable usually suits a tough polymer; a fixed station earns metal. Match material to the life.
Does an IP66 rating prove a housing is UV resistant?
No. The IP code tests dust and water ingress only. UV resistance is a material property of the resin grade and finish, proven by weathering evidence — a separate document from the IP test report.
A housing yellowed even though it was sold as UV resistant — why?
Because “UV resistant” without a grade and a test behind it is an adjective, not a specification. Stabiliser packages differ, coatings wear, and exposure differs by site. Ask what evidence backs the claim.
Related Reading
- Do You Need an EV Charger Enclosure? How to Choose an Outdoor Enclosure
- IP Ratings for EV Chargers: IP54, IP65 and IP66 Compared
- EV Charger Factory Audit Checklist for Importers
- Choosing Plug, Cable and Connector for an OEM Charger by Market
