Generator sizing Last reviewed June 2026
What Size Generator for EV Charging? Level 1 + Level 2 Guide
By the WhatSize editorial team 5 min read Standards-reviewed
For Level 1 EV charging (120V, 12A), a 1,500W generator is sufficient. For Level 2 charging (240V, 32A), you need at least 7,500W. Most homeowners choose a 7,500-12,000W generator to run both home essentials and an EV charger during outages.
What an EV Draws During Charging
Electric vehicle charging loads are substantial. A Level 1 charger (120V, 12 amps) draws 1.44 kW continuously for 12-24 hours to fully charge a standard EV. A Level 2 charger (240V, 32 amps) draws 7.68 kW and can replenish most EVs overnight in 6-10 hours.
The NEC requires EV charging circuits to be treated as continuous loads (Article 625), meaning the circuit must be sized at 125% of the charger's rated load. For generator sizing, this means a 32A Level 2 charger (7.68 kW) needs a generator that can sustain about 8 kW continuously, plus surge capacity for the startup load.
Top picks for this size
These Amazon-available picks meet the calculated spec. For region-specific or licensed contractor-installed options, consult a local professional. See our Disclaimers.
Generator Options for EV Charging by Charger Type
- Level 1 only (120V, 12A): 2,000-3,000W portable generator is enough for charging + a few essentials
- Level 2, 16A (3.84 kW): 5,000W generator — can charge while running fridge + lights + furnace
- Level 2, 32A (7.68 kW): 7,500-8,500W generator — needs dedicated circuit, run essentials + EV
- Level 2, 48A+ (11.5+ kW): 14,000W+ standby generator — whole-house solution required
Frequently asked questions
Can I charge my EV with a portable generator?
Yes. Level 1 charging works with any generator rated for 1,500W+. For Level 2, you need a generator with a 240V outlet rated for the charger's amperage. A 7,500W generator with an L14-30R receptacle can handle most Level 2 chargers.
Will charging my EV from a generator damage my car?
No, provided the generator produces clean, stable power (THD <5%). Most inverter generators meet this spec. Conventional generators may produce dirty power that can confuse the EV's charging controller.
How many EV charges can I get from one generator tank?
A 7,500W generator burning 1 gal/hr of propane can add about 25-30 miles of EV range per hour of Level 2 charging. A full 20-lb propane tank gives roughly 150 miles of range over 6 hours.
You might also need
More generator sizing guides
- What Size Generator for a 2,000 Sq Ft House?
- What Size Generator to Run a Sump Pump?
- What Size Generator to Run a Window AC Unit?
- What Size Generator for an RV? A Complete Guide
- What Size Generator to Run a Refrigerator?
- Portable vs Standby Generator: Which Size Do You Need?
- What Size Propane Tank for a House Generator?
- What Size Generator for a 200 Amp Service?
- Generator Propane Consumption Calculator + Runtime Chart