Yes, the EV-ACS4005T can charge from a generator — the charger simply draws 240 V power, and its adjustable current makes the pairing workable. The catch is this unit’s floor: its lowest setting is 16 A, about 3.8 kW, so it needs a mid-size generator with a continuous rating comfortably above that. The smallest portable generators sit below its floor, and two further checks — earthing and power quality — decide whether the car accepts the supply at all.
Key Takeaways
- The EV-ACS4005T can charge from a generator; the setting you choose, not the 9.6 kW rating, decides the pairing.
- Its floor is 16 A — about 3.8 kW — so it needs a mid-size generator; smaller units fall below the floor.
- Earthing and waveform decide whether the car accepts the supply; a refusal is the safety check working.
- Outdoors only, supervised, and stopped at the first sign of trouble — it is an emergency bridge, not a routine.
Start From This Unit’s Settings, Not Its Rating
Judge the pairing by the setting you choose, not the 9.6 kW headline. Set the current before you plug in, start at the lowest step, and let the generator settle before considering a step up.
| Setting | Draw at 240 V | What the generator needs |
|---|---|---|
| 16 A | About 3.8 kW | A continuous rating comfortably above 3.8 kW — a mid-size portable |
| 24 A | About 5.8 kW | A large portable generator, run below its limit |
| 32 A | About 7.7 kW | Beyond most portable generators |
| 40 A | 9.6 kW | A house supply’s job, not a portable generator’s |
Judge any generator by its continuous (running) rating, not the peak figure on the box, and leave headroom: a generator held at its limit may trip its own breaker mid-charge, and repeated cut-outs are the setup telling you the load is too much.
The Floor Is the Difference With This Unit
Adjustable chargers are not all alike here. The EV-ACS4005T turns down to 16 A. Its smaller sibling, the EVDANCE EV-ACS3210T, adjusts from 10 A in six steps — about 2.4 kW at its floor — which is why it pairs with smaller generators. If generator charging is your main plan rather than an emergency bridge, that lower floor is the deciding spec. With the ACS4005T the arithmetic is blunt: a generator rated below about 4 kW continuous cannot carry even its gentlest setting.
The Two Checks That Decide Whether It Starts
- Earthing. Before power flows, the car verifies a proper protective earth. A house supply provides it; many portable generators are arranged differently, and the car may refuse to start. That refusal is the safety system working. Follow the generator maker’s earthing instructions for your model — and if they are unclear, ask a licensed electrician. Never improvise a connection or bypass the check.
- Power quality. Cars expect mains-quality power. Inverter generators produce a cleaner, steadier waveform than conventional models and are the safer match. If voltage sags as the generator labours, the charger may pause or stop.
The general ground is covered in our guides to charging an electric car with a generator and portable charger safety.
Running the Session
- Outdoors only, always. Generator exhaust contains carbon monoxide. Never run one in a garage, even with the door open, or near windows and vents.
- Supervise it. An improvised supply deserves more attention than a wallbox: check in on the session, and keep connections dry.
- Stop if anything changes. A hot-plastic smell, a struggling engine note, repeated drops — end the session and find the cause.
- Cool before refuelling, and keep fuel away from the hot engine.
The Charger
The EVDANCE EV-ACS4005T is a 40 A NACS portable charger: 9.6 kW at full setting, adjustable 16/24/32/40 A, NEMA 14-50 plug, 1.77-inch display, IP66 rating, 25 or 28 ft cable. Its display shows the current actually drawn, so you can confirm the session runs at the step you set.
Frequently Asked Questions
What size generator does the EV-ACS4005T need?
One whose continuous rating sits comfortably above the draw at the setting you choose: above about 3.8 kW for the 16 A setting, with headroom on top. Peak ratings do not count — a generator run at its limit trips or sags.
Why does my car refuse to charge from the generator?
Most often the earthing check: the car verifies a protective earth before it will charge, and many portable generators are not earthed the way a house supply is. Follow the generator manual’s earthing arrangement or ask an electrician — do not bypass the check.
Is a generator a good everyday way to charge this car?
No. It burns fuel, needs supervision and refuelling, and charges slowly at the settings a portable generator can sustain. Treat it as a bridge for outages and remote stops.
Related Reading
- Can I Charge an Electric Car With a Generator?
- Portable EV Charger Safety Guide 2026: NEC Rules, Extension Cords, and What to Avoid
- Do Portable EV Chargers Work? How Speed Depends on the Outlet
