Because 32 A is an offer, not an instruction. The charger advertises the most it can give; the car draws what its onboard charger accepts. A result of exactly 16 A usually means one of three ordinary links set the draw there: the charger’s setting, the cable, or the car itself.
Key Takeaways
- The charger advertises a ceiling; the car decides its draw up to it.
- Exactly 16 A on a 32 A charger comes from the setting, the cable’s rating, or the car’s own limit.
- Check in that order: setting, cable, car documents — each check is free.
- Raise a setting only within the circuit it was matched to (the 125% rule).
Advertise and Draw: Who Decides
At the start of a session the charger signals the maximum current available. The car then takes any amount up to that ceiling, and the figure you watch is the car’s draw, not the charger’s promise. That is why an exact, steady 16 A is informative: faults rarely land on a clean step. A round number like this is almost always a setting, a rating or a design limit doing what it was built to do.
The Three 16 A Links
| Link | How it produces exactly 16 A | How to check it |
|---|---|---|
| The charger setting | An adjustable charger is set to 16 A — a step on many models — so it advertises 16 A | Read the set current on the unit’s display or app, against the circuit it was matched to |
| The cable | A 16 A-rated cable tells the charger to advertise no more than the cable can carry | Read the rating printed on the cable or plug; try the car’s other cable if it has one |
| The car | Its onboard charger is in the 16 A class by design, or a limit is set in the car’s menus | The car’s stated AC maximum in its documents, and its charge-limit settings |
The cable row surprises people. A removable cable is a rated component, not a passive wire: the charger reads what the cable can carry and trims its offer to match. Our explainer on portable charger types from 10 A to 32 A and the CEE plug guide show where those ratings are marked. One more class belongs on shared sites: a managed site can trim the offer at busy times, dividing power between cars — if 16 A appears only at a busy workplace post, that is its load management, explained in Does Load Balancing Increase EV Charging Speed?.
Check Them in This Order
- The setting first. It costs nothing: read the set current. If it says 16 A, you have your answer — but raise it only within the circuit the charger was matched to. Under the NEC continuous-load rule the breaker is sized at 125% of the charging current, so a 32 A setting belongs on a 40 A breaker; the pairing is the installer’s, not a dial to experiment with.
- The cable second. Swap in a cable rated 32 A, or read the printing on the one you have.
- The car’s documents third. If the setting offers 32 A and the cable carries 32 A, the car’s stated AC maximum is the remaining answer.
Settings You Can Read at a Glance
Two EVDANCE portables make the setting class concrete. The EV-ACS3210T is a 32 A NACS portable, about 7.7 kW on a NEMA 14-50P, adjusting from 10 to 32 A in six steps, IP66. The EV-ACS4005T is a 40 A NACS portable at 9.6 kW whose steps are 16, 24, 32 and 40 A. Note the first step: an ACS4005T left at its lowest setting after a careful installation on a smaller circuit advertises exactly 16 A, and a car charging at 16 A on it is reporting a deliberate pairing, not a defect. On both models the set step shows on the unit’s display — which is why the first check above is simply to look.
Frequently Asked Questions
Is my charger faulty if it only ever delivers 16 A?
Almost never on this symptom alone. An exact, repeatable 16 A is a limit being applied cleanly. A fault is what remains when the setting offers 32 A, the cable carries 32 A, and a 32 A car still draws 16 A everywhere.
Will a 32 A cable fix it?
Only if the cable is the limiting link. If the charger is set to 16 A, or the car’s maximum is 16 A, a new cable changes nothing.
The display says 32 A but the car draws 16 A. Which is wrong?
Neither. The display shows the offer; the car shows its draw. When they differ, the limit is downstream of the offer — the cable’s rating or the car’s maximum.
Related Reading
- Portable EV Charger Types Explained: 10A, 16A, 32A and Three-Phase Models
- CEE Plugs Explained: Choosing 16A or 32A for a Three-Phase Portable EV Charger
- Does Load Balancing Increase EV Charging Speed?
- Why Is My Electric Car Charging Slowly at Home?
