No. Turning the EV-ACS4005T down to 16 A lowers the current, but it fixes neither problem an extension cord creates: an extra plug joint that nothing monitors, and a household cord carrying a continuous load for hours. At 16 A the session gets longer, so the cord carries that load for more hours, not fewer.
Key Takeaways
- At 16 A, adding 40 kWh takes roughly 11.5 hours — the cord carries the load longer, not more safely.
- The problems are the unmonitored joint, the continuous load and heat trapped in a coil — none depends on the setting.
- “Heavy-duty” describes a cord’s build, not an EV or continuous-load rating.
- Fix reach with the 28 ft factory cable, parking position, or a closer outlet.
What the 16 A Setting Actually Changes
The four settings exist to match the circuit in front of the charger: 16, 24, 32 or 40 A, each paired to a breaker by the continuous-load rule covered in our guide to how many amps an EV charger needs. What a lower setting does is stretch the session:
| Setting | Output | Time to add 40 kWh (example) |
|---|---|---|
| 40 A | 9.6 kW | About 4.5 hours |
| 32 A | About 7.7 kW | About 5.5 hours |
| 24 A | About 5.8 kW | About 7.5 hours |
| 16 A | About 3.8 kW | About 11.5 hours |
So the “gentler” setup keeps a household cord loaded all night and into the morning. Lower current slows the heating at a bad contact; it does not remove the contact, and it multiplies the hours.
Why the Joint Is Still the Problem at Any Setting
Heat in an extension-cord setup builds at the plug joints, not in the middle of the cable. A slightly loose or worn contact can run warm over a long session even at modest current. Three facts do not change when you turn the charger down:
- The middle joint is unmonitored. A charger can only sense its own plug and body. Nothing watches the extra connection halfway along a cord, at any setting.
- The load is still continuous. EV charging draws its set current for hours without a break, which is why the National Electrical Code treats it as a continuous load and sizes circuits at 125%. Household cords are bought for intermittent jobs, not an all-night draw.
- A coiled cord traps heat. Spare cord is usually left wound up, and a coil cannot shed heat, whatever the current.
Our portable EV charger safety guide sets out the code rules. Where a manual prohibits extension cords, that settles it — at every setting.
The “Heavy-Duty” Label Does Not Settle It Either
“Heavy-duty” describes a thicker jacket and sturdier plugs. It is not an EV rating and not a continuous-load listing. A heavy cord removes none of the three problems above — the label describes the cord, not your use of it.
Reach Fixes That Work With This Charger
The reach problem is real; the cord is the wrong fix. Options inside this charger’s own facts:
- Choose the longer factory cable. The EV-ACS4005T comes with a 25 ft or 28 ft cable. Those three extra feet solve many out-of-reach cases with no extra joint — our cable length guide shows how to measure first.
- Park the charge port closer. Reversing in, or parking on the other side of the driveway, often brings the port inside the cable you own.
- Use a closer existing outlet, matched to a setting. A portable can work from any suitable 240 V outlet, setting matched to its circuit — that is what the 16–40 A range is for.
- Know the one extension that is a different product. A purpose-built EV charging extension cable extends the car side and is rated for charging current — our article on whether you can extend an EV charging cable covers its checks.
The EVDANCE EV-ACS4005T is a 40 A NACS portable charger: 9.6 kW from a NEMA 14-50 plug, 16/24/32/40 A settings, IP66 enclosure, 25 or 28 ft cable. Its reach is designed into the cable and the settings.
Frequently Asked Questions
Is one short session at 16 A really a problem?
At 16 A there is no short session: adding even 20 kWh takes about six hours. The risk is heat building over hours at a joint, and a low setting gives it more hours. The advice against cords has no one-night exception.
Does a shorter or thicker cord change the answer?
No. Thickness addresses voltage drop in the cable itself; the unmonitored joint and the continuous load are unchanged by gauge or length.
Can I set the charger to match a small circuit at a house I visit?
Yes — that is what the settings are for. Match the setting to the outlet’s circuit, with the charger plugged straight in. The setting adapts the charger to the circuit, not a cord to the charger.
Related Reading
- Portable EV Charger Safety Guide 2026: NEC Rules, Extension Cords, and What to Avoid
- Can You Extend an EV Charging Cable?
- EV Charger Cable Length Guide: 5 m, 7.5 m or Longer?
