EV Charger Cooling Fan for AC Wallboxes & DC Fast Chargers

An EV charger is a sealed power converter standing outdoors. Between 3% and 5% of the energy it delivers turns into heat inside the cabinet, and that heat has to leave through a filter, a louvre and a fin stack before it reaches the fan. YUNFAN Power supplies 24 V DC, EC and 220 V AC fans with IP68 protection and PWM or 0–10 V speed control for wallboxes, DC fast chargers and multi-gun charging stations.

Part of: cooling fan applications · also relevant to power supplies.

Why a charger fan is not a general-purpose fan

Static pressure decides everything. A dust filter, a rain louvre and a closed fin stack can add 40–80 Pa of resistance. A fan chosen on free-air CFM can lose half its airflow at that impedance — the operating point, not the headline figure, is what cools the module.
IP68 rather than IP54. Cabinets are washed, rained on and mounted near the kerb where salt spray collects. Once water reaches the motor bore, the fan is a warranty claim in a car park.
Speed control is a durability feature. Running at 100% all night pulls in dust and annoys the neighbourhood. PWM or 0–10 V control lets the controller follow module temperature and hold a lower duty point when the charger is idle.
Ten-year service expectation. A charger outlives most of the electronics around it. Dual ball bearings and a lubricant matched to the cabinet’s real internal temperature are the difference between a 30,000-hour and an 80,000-hour fan.

Fan sizes and voltages for charging equipment

Frame	Typical charger	Voltage / control	Models
92 mm	7–22 kW AC wallbox	12 / 24 V DC	DC 9238
120 mm	30–60 kW DC module	24 V DC	DC 12038
120 mm EC	60–120 kW, variable speed	220 V AC, 0–10 V or PWM	EC 12038
172 mm	120–350 kW cabinet	24 V DC, IP68	DC 17251 IP68
225–280 mm	multi-gun station, containerised hub	220 V, 380 V AC	AC 22580, AC 28080

Where charger cooling fails

Intake and exhaust on the same face. The fan pulls its own exhaust back in, the cabinet stays hot, and the airflow figure on paper never appears in the field. Separate the paths by at least the fan diameter.
Filter clogging with no alarm. Without a differential-pressure switch the operator only learns about it when the charger derates in summer. Size the fan with margin for a half-blocked filter, and specify the filter as a service item.
Fan rated at 40 °C in a cabinet that runs at 65 °C. Solar gain on a dark enclosure adds 10–15 °C on top of the ambient, which is where bearing selection has to start.

How to specify your charger fan

Pressure drop of the complete air path: filter, louvre, fin stack, duct bends.
Maximum internal air temperature in summer, including solar gain.
Ingress protection: IP55 under a canopy, IP68 for exposed or coastal sites.
Control interface: PWM at what frequency, 0–10 V, or a simple thermostat line.
Service life target and the warranty you offer on the charger.

Questions from charger manufacturers

What does IP68 mean for a cooling fan?

IP68 is a dust-tight enclosure that survives continuous immersion under the conditions agreed with the test house. On a fan this means a sealed stator, a potted or gasketed lead exit and a frame that does not rely on the impeller gap as a drain. We can supply the SGS test report for our IP68 models.

Can you supply a 24 V PWM fan with a 4-pin connector?

Yes — 4-wire PWM with FG tachometer output is a standard configuration on our DC axial range. Give us the PWM frequency your controller uses, because a fan designed for 25 kHz behaves badly on a 100 Hz line.

EC or DC for a 120 kW charger?

EC where the cabinet already has mains available and you want the fan to run from AC with built-in 0–10 V control. DC where the module has a 24 V rail and you want the lowest possible standby loss. Both are available in the 120 mm frame, so the mechanical design does not have to change.

Send the cabinet drawing, the filter specification and the ambient, and we will model the operating point before quoting. Start with your requirement.