When the EV-ACS4005T lowers its current mid-session, it is usually not broken. The drop has a short list of causes you can check in order: the current step you selected, the car asking for less, the charger managing its own heat, or a problem at the outlet or plug. Its screen shows the delivered current, so you can see which check explains your session.
Key Takeaways
- Check the selected current step first — an old setting is the most mundane cause.
- The car can cap or taper the session; both patterns are normal and visible.
- Heat-related slowdowns on hot days are the charger protecting itself.
- A warm plug or outlet is a stop-and-inspect sign, never a settings issue.
Check 1: The Setting You Selected
The EV-ACS4005T charges at the step you choose: 16, 24, 32 or 40 A, and a step chosen for a smaller circuit stays chosen. Set 24 A for a 30 A dryer circuit last month and never changed it back, and the charger is not slowing down — it is doing what it was told. Read the selected step on the screen before suspecting a fault, and remember the setting must always match the circuit behind the outlet, as our guide to what size breaker an EV charger needs sets out.
Check 2: The Car Is Setting the Pace
With AC charging, the car’s onboard charger converts the power and can ask for less than the charger offers. Two patterns give it away.
If the current never reaches your selected step from the first minute — even with a cool charger and a low battery — the car’s own AC limit is probably below the setting. If the session runs at full current and eases off only near the top of the charge, that is the normal taper described in why EV charging slows down after 80%. The car’s display usually confirms which side is asking for less.
Check 3: Heat, on a Hot Day or a Long Session
Chargers reduce current to control their own temperature. A session that starts fast and steps down on a hot afternoon, then recovers in cooler weather, fits that pattern — it is a protection working, not a failure. Placement matters for a portable unit: direct sun, a closed hot car, or a cover over the housing all trap heat, as our guide to hot-climate EV charging explains. EVDANCE does not publish a step-down temperature or derating curve for this model, so give the unit shade and airflow, and treat the manual as the reference for your unit.
Check 4: The Outlet and Plug — a Stop Sign, Not a Slowdown
One cause is not normal behaviour. If the plug or outlet feels warm, shows discolouration, smells, or fits loosely, stop the session and have the outlet inspected. Heat at the connection points to a poor contact, which is a different problem from a charger managing its own temperature; our explainer on whether EV charging cables should get hot covers where warmth is expected and where it is not. Do not answer a warm outlet by simply selecting a lower step and carrying on.
| What you notice | First check | What it usually means |
|---|---|---|
| Never reaches the set current, even when cool | The car’s AC charging limit | The onboard charger caps the session |
| Full speed early, slower near full | The battery’s state of charge | Normal taper, controlled by the car |
| Slows on hot afternoons, recovers overnight | Sun, airflow and covers on the unit | Heat management by the charger |
| Warm plug or outlet, smell, loose fit | Stop; inspect the connection | A contact problem — an electrician’s job |
One more reading helps: power is current × voltage, so if the amps hold but the kilowatts fall, check the voltage on the screen — a sagging supply shows up there first. The EV-ACS4005T‘s selectable steps and session display are what make these four checks possible without guesswork. If none explains the drop, our diagnosis of why an electric car charges slowly at home works through the remaining causes.
Frequently Asked Questions
Does charging at a lower current harm the battery?
No. The car simply receives energy more slowly and the session takes longer. Slower AC charging is not harmful to the battery.
Should I just set it back to 40 A when I see a lower number?
Only if the circuit supports it: 40 A of continuous charging belongs on a 50 A circuit under the NEC 125% rule. Raising the step to fix a heat or outlet problem makes things worse, not faster.
When is a current drop a reason to stop altogether?
When it comes with a warm plug or outlet, a smell, visible damage, or a breaker that trips. Those are inspection problems for a licensed electrician or the manufacturer, not settings problems.
Related Reading
- Why Is My Electric Car Charging Slowly at Home?
- Why Does EV Charging Slow Down After 80%?
- Do EV Charging Cables Get Hot?
- What Size Breaker Do I Need for an EV Charger?
