A granny charger gives you one fixed rate: about 10 A, roughly 2.3 kW, take it or leave it. An adjustable portable charger such as the EV-ACS3210E gives you a range instead — settings from 10 A up to 32 A. So the same unit can sip at granny pace from a socket you do not know, or deliver about 7 kW on a supply that is built for it. What adjustable current adds is not only speed. It is the ability to match the supply in front of you.
Key Takeaways
- A granny charger is fixed at about 10 A and 2.3 kW; the EV-ACS3210E adjusts from 10 A to 32 A.
- The low settings match a granny cable’s pace for unknown sockets; the top setting gives about 7 kW on a confirmed circuit.
- The supply always sets the ceiling — the charger setting must stay under it.
- Both chargers are continuous loads: same socket care, same heat checks, no extension leads.
The Step Ladder, in Plain Numbers
The settings below are this unit’s range. The power figures are plain arithmetic at 230 V, shown against a granny cable’s fixed output — calculations, not extra ratings.
| Setting | Power at 230 V (arithmetic) | Where it earns its place |
|---|---|---|
| 10 A | About 2.3 kW | Granny pace: an unknown or shared socket, a cautious first session |
| 13 A | About 3.0 kW | A small step up where the circuit allows a little more |
| 16 A | About 3.7 kW | A stronger household circuit or an industrial-type socket |
| 20 A | About 4.6 kW | A circuit with real headroom, still short of a dedicated install |
| 24 A | About 5.5 kW | Near-dedicated territory; most of the overnight benefit |
| 32 A | About 7.4 kW (listed as about 7 kW) | A dedicated circuit that an installer has confirmed for the load |
Our overview of portable charger types shows where these ratings sit, and our comparison of Level 1, Level 2 and DC fast charging shows what the extra power does to charging time.
What the Steps Change in Practice
- Arriving somewhere new. At a relative’s house or a rented cottage, start at 10 A. The socket’s history is unknown, and granny pace is the pace that asks the least of it.
- Charging at home on a real circuit. Where an installer has confirmed the supply can carry it, the higher settings turn the same unit into a genuine overnight charger instead of a top-up cable.
- Sharing a supply with the house. A mid setting leaves headroom for everything else the home is running, instead of an all-or-nothing choice between charging and cooking.
- One unit, several homes. The setting travels with the situation, not with the charger — the same unit can be cautious at one address and quick at another.
What Adjustable Current Does Not Change
An adjustable charger is still a portable unit drawing a continuous load for hours, and it deserves the same respect as a granny cable. The socket and plug must be in good condition, heat at the plug is a stop sign, and extension leads stay out of the setup — our portable charger safety guide covers the checks. Setting 32 A does not create a 32 A circuit: the supply sets the ceiling, and only an installer can tell you what yours can carry. Nor should the granny cable be dismissed — for occasional use and emergencies it remains the simplest tool there is, as our guide to charging from a normal socket explains.
Beyond the Current: What Else This Unit Adds
The EV-ACS3210E also brings an app with energy monitoring, so you can see what a session used instead of guessing from the car’s percentage, and OCPP-ready connectivity for buyers who may connect the unit to a management platform later. Its cable is 7.5 m. None of that changes the charging maths above — it changes how much control and information you have while it happens.
Frequently Asked Questions
Is a granny charger unsafe compared with an adjustable one?
No. A granny charger plugged directly into a sound socket, with the plug checked for heat, is a legitimate occasional charger. The adjustable unit adds range and information, not a different safety category; both are continuous loads and both need the same socket care.
Can I just set 32 A on any socket?
No. The setting must stay within what the circuit can carry continuously. A domestic socket is a 10 A-class supply in practice; the higher settings belong on circuits an installer has confirmed for them.
Does the adjustable unit replace a fixed wallbox?
Not for everyone. If you charge a high-mileage car every night, a fixed wallbox is still the settled long-term answer. The adjustable portable wins on flexibility: one unit that fits several supplies and travels with you.
Related Reading
- Can I Charge an Electric Car From a Normal Socket?
- Portable EV Charger Safety Guide 2026
- Portable EV Charger Types Explained: 10A, 16A, 32A and Three-Phase Models
- Level 1 vs Level 2 vs DC Fast Charging
