Yes, in an emergency, but slowly. A Level 1 charger needs about 1.4–1.9 kW continuously, so the generator must supply that without strain, produce clean power (an inverter generator is best) and provide a ground the charger accepts. Many chargers refuse to start on portable generators because of a “floating neutral” that makes them think the ground is missing. Each hour of Level 1 charging adds only about 3–5 miles of range.
Generator Requirements
| Requirement | Why |
|---|---|
| Continuous rating of at least 2 kW for Level 1 | EV charging is a continuous load |
| Inverter generator (clean sine wave) | Chargers and cars reject distorted power |
| Proper grounding / bonded neutral | Charger safety checks need a ground |
| Larger 240 V generator for Level 2 | 7 kW+ continuous for meaningful Level 2 |
Is It Worth It?
Burning fuel to charge an EV is inefficient compared with grid charging. It makes sense only in emergencies, off-grid situations or remote work sites. Never run a generator indoors or in a garage, because of carbon monoxide.
Alternatives
- Plan to reach a public charger; see where to find EV charging stations.
- Rooftop solar with suitable equipment; see solar panels and EV chargers.
- Home batteries, within their capacity; see charging from portable batteries.
An adjustable portable charger such as the EVDANCE EV-ACS3210T 32A NACS portable charger can be set to its lowest current (10 A) to reduce the load on a generator.
Frequently Asked Questions
What size generator do I need to charge an EV?
At least about 2 kW continuous for Level 1, and 7 kW+ at 240 V for Level 2.
Why does my charger not work on a generator?
Often a floating neutral or poor power quality; inverter generators and proper bonding help.
Can I charge my EV with a generator while driving?
No. That is not a practical or safe setup.
Related Reading
- Can You Charge an EV With a Portable Battery?
- Solar Panels and EV Chargers
- Why Is My EV Charger Flashing Red?
Key Takeaways
- A generator can charge an EV slowly in emergencies.
- Use an inverter generator with adequate continuous output and proper grounding.
- Never run a generator indoors.