Yes — a charger always makes some heat while it works, and a sealed or badly ventilated space lets that heat build up until the unit protects itself by slowing down or stopping. A wallbox fitted on an open garage wall, with the clearances its manual specifies, is built for exactly this job. Trouble starts when a charger is boxed into a cabinet, a sealed enclosure or a crowded cupboard that traps warm air around it.
Key Takeaways
- Chargers shed heat to the air around them; an open wall is fine, a sealed box is the problem.
- There is no universal clearance distance — the model’s manual sets it, and the installer checks it at the survey.
- Repeated slowdowns on hot days mean the unit is protecting itself; report the placement, do not open the unit.
- Tell the installer about small or shared spaces before choosing the model, not after fitting it.
Where a Charger’s Heat Comes From
A wallbox is power electronics. Converting and controlling the supply for hours at a time produces waste heat, and the harder the unit works, the more heat it has to shed. That is normal, and it is why chargers are designed to lose heat to the air around them. Our overview of whether home EV chargers are safe covers the built-in protections; this page is about the room, not the unit. The car’s side matters too: a car that arrives warm and charges in a closed garage on a hot day is adding its own heat to the same small volume of air.
The Spaces That Trap Heat
Most garages are fine. The risky arrangements share one feature: air cannot move freely around the unit.
| Arrangement | Airflow picture | What to do |
|---|---|---|
| Open wall in a garage or carport | Warm air rises and disperses into the room | The normal case — fit per the manual and leave the space around the unit clear |
| Utility cupboard or small closet | Small air volume, often shared with other warm equipment | Ask the installer at the survey; the manual’s clearances decide whether the spot works |
| Sealed cabinet or boxed-in enclosure | Heat is trapped against the unit itself | The arrangement to avoid unless the enclosure is made and vented for the job |
| Outdoor enclosure | Depends entirely on the enclosure’s design | Use a purpose-made outdoor enclosure, as our guide to EV charger enclosures explains |
Clearances Belong to the Manual, Not to a Forum
There is no universal safe gap you can copy from another owner’s photo or a forum post. The space a charger needs above, below and beside it is a property of that model, and it is printed in its installation manual. Anyone quoting you a distance without naming the model is guessing. The licensed electrician checks the clearances at the survey, before anything is fixed — the same visit that settles whether the charger belongs inside or outside the garage in the first place.
If a charger repeatedly slows down or stops on hot afternoons, treat that as the unit protecting itself, not as a fault to work around. Do not open the casing, and do not aim a fan at it and call the problem solved: a fan is not a substitute for the specified clearances. Tell the installer where the unit sits and what happens; moving the unit or opening up the space around it is installation work.
EVDANCE Wallboxes for Indoor Spaces
Every EVDANCE home charging station is a wall-mounted unit with app and RFID access, designed to be fitted with the clearances its manual sets out. If the only available spot is a small room, say so before you choose the model: a lower-power unit from the EVDANCE residential range puts less heat into a small space. The trade is charge speed, so pick it with the installer, not after.
Frequently Asked Questions
Can I put my EV charger in a cupboard?
Sometimes — it depends on the cupboard’s size, what else is in it, and the clearances the charger’s manual requires. It is a survey question for the installer, not a yes you should take from a product listing.
Why does my charger slow down on hot days?
Chargers protect themselves: when the unit or its surroundings get too warm, it may reduce output or pause rather than overheat. In a well-sited installation this is rare; if it happens often, the placement needs a second look.
Can I add a vent or a fan to the enclosure myself?
Changing an enclosure or the unit’s surroundings is installation work. Keep the space around the charger clear, and leave vents, enclosures and any repositioning to the installer who fitted it.
Related Reading
- Are Home EV Chargers Safe?
- Do You Need an EV Charger Enclosure? How to Choose an Outdoor Enclosure
- Hot-Climate EV Charging: Protecting Chargers From Desert Heat and Sun
- Should an EV Charger Be Inside or Outside the Garage?
