Black and anthracite EV chargers look clean and architectural, but darker surfaces generally absorb more solar energy than lighter ones. In direct summer sun, the surface of the enclosure can therefore become much hotter than the surrounding air.
VoltaCover comparison
Under the conditions of our comparison test, the surface protected by Crystal Shell measured approximately 10–15°C cooler than the directly exposed surface. This was a surface-temperature comparison in specific conditions, not a guaranteed result for every installation.
Why dark EV chargers heat up more
Dark colours reflect less solar radiation and convert more of it into heat. The effect is strongest on south- or west-facing walls, during still afternoons and where the wall behind the charger is itself dark or heat-absorbing.
Air temperature is not surface temperature
- Air temperature: the surrounding environmental temperature, normally measured in shade.
- Surface temperature: the temperature measured on the charger enclosure.
- Internal temperature: the temperature of the electronics, managed according to the charger’s own design.
These values are not interchangeable. A black fascia in strong sunshine can be significantly hotter than the reported weather temperature.
UK locations that can see strong solar loading
- south- or west-facing house walls;
- open driveways with no shade;
- black chargers on dark brick or cladding;
- sheltered corners with little airflow;
- long afternoon sun during hot spells;
- charging sessions that coincide with direct summer sun.
Understanding the VoltaCover test
VoltaCover compared the surface temperature of a charger in direct sunlight with the same type of exposed surface shaded by Crystal Shell. In those specific test conditions, the measured difference was about 10–15°C.
For a meaningful comparison, the charger model, colour, wall orientation, time, weather, measurement point and instrument should all be recorded.
How to state the result correctly
Not: “Crystal Shell always reduces temperature by 15°C.” Correct: “Under the conditions of the comparison test, the measured surface temperature was approximately 10–15°C lower.”
Why heat is also an appearance issue
Dark fascias make pollen, dust, hard-water marks and fine scratches particularly visible. Repeated UV and heat exposure can also change gloss level or colour uniformity over time.
What an EV charger sun cover does
Crystal Shell intercepts some direct solar radiation before it reaches the top and front of the charger. It does not actively cool the charger; the effect comes from shading.
The sides remain open so normal charging, cable handling and maintenance are not blocked.
UK installation note
An external cover does not replace a compliant EV chargepoint installation. The charger must remain suitable for its location and be installed in accordance with the manufacturer’s instructions and applicable electrical requirements. UK government chargepoint specifications reference BS EN 61851, BS 7671 and the IET Code of Practice for Electric Vehicle Charging Equipment Installations. Any required clearances, cable routes and access must remain unchanged.
Shading removes one external heat source: direct solar radiation.
Related guides
Sun protection for black EV chargers
Crystal Shell shades the top and front without putting the charger inside a closed cabinet.
Discover Crystal ShellFrequently asked questions
Does every black charger get hotter than a white one?
With comparable materials and exposure, a darker surface generally absorbs more solar energy.
Is a 10–15°C reduction guaranteed?
No. It is the result of a specific comparison test and will vary by location and conditions.
Does a white charger need no protection?
Light-coloured chargers are still exposed to UV, hail, rain and dirt.
Does Crystal Shell actively cool the charger?
No. It reduces direct solar exposure by creating shade.
How should surface temperature be measured?
Use the same instrument, measurement point and conditions, and record time, weather and orientation.