位置完全露天，長期日曬雨淋。IP65 機身加裝防水遮罩，並獨立打設接地樁，經歷多場黑色暴雨後運作正常。Fully exposed to sun and rain. IP65 body plus a rain shield, with its own earth rod. Several black rainstorms later, no faults.
A three-storey village house in Sai Kung with the bay down the side of the building, fully exposed — no canopy, no shelter, west-facing sun all afternoon, and summer rain hitting the wall directly. The meter sits by the front door; the bay is on the opposite side, with a stretch of exterior wall in between.
The owner had already approached two companies. One quoted and never followed up. The other suggested "just put a plastic box over it".
The hard part
Not the electrics — the water and the UV.
The meter was single-phase 60A with enough capacity for 7kW, so that part was straightforward. The real problem was that this position has to survive sun and rain every day for the next decade. Hong Kong's UV makes ordinary PVC trunking brittle and split within two or three years, and black-rainstorm rain arrives sideways, which a simple overhead cover does nothing about.
Earthing was the other issue. Village house earthing varies a lot, and some older properties have high earth resistance — which matters more for an outdoor installation, not less.
What we did
UV-resistant trunking. About 8m along the exterior wall, using anti-UV trunking throughout with weatherproof gaskets at the joints. Fixed with stainless steel screws and anchors so nothing rusts and stains the wall.
IP65 body plus an added rain shield. The Wall Case 3 is IP65 (dust-tight and protected against water jets) out of the box. But because the rain here comes in sideways, we added a shield projecting far enough forward to keep water off the connection face and the plug.
Its own earth rod. Measured on site, the existing earth resistance wasn't good enough, so we drove a separate earth rod near the charger to give it a dedicated earth, and recorded the resistance on the test certificate.
Every entry facing down. All cable entries and connection points open downwards, so any water running down the trunking can't pool at a joint.
The outcome
Several black rainstorms and typhoons later, it runs normally — no tripping, no water ingress. A year on, the owner reports the trunking hasn't discoloured or deformed.
Who this case is useful for
If your bay has no canopy and no roof, the question to ask a company quoting you isn't "how much" but:
Is the trunking UV-resistant?
How far does the shield project — does it stop sideways rain?
What earth resistance did you actually measure, and is it on the test record?
Companies that can answer those three usually do the job properly.
你的物業與這個案例相似？Does your place look like this one?
傳送車位及電錶相片，我們會告知最接近哪一種情況、需時多久及費用多少。Send photos of your bay and meter. We'll tell you which case yours resembles, how long, and how much.
