Last updated 21 September 2026. An onboard charger takes the incoming AC electricity at an electric car's charge port and converts it to DC power for the traction battery. The U.S. Department of Energy's Alternative Fuels Data Center defines the part that way for an all-electric car.
On 21 September 2026 the evstats.org catalog has no onboard-charger kilowatt field. Of 1,386 available cars, 1,364 list a peak DC charge rate, and the median of those rates is 150 kW.
That 150 kW median, dated 21 September 2026, is the car's DC fast-charge peak. AFDC says most residential Level 2 chargers deliver 7.2 kW, and that a Level 2 unit can range from 2.9 to 19.2 kW.
AFDC says charging time depends on the vehicle's internal charger capacity as well as the equipment, so a higher-rated wall box does not raise AC charging past that converter.
AFDC rates DC fast charging equipment at up to 500 kW of direct current. That path supplies DC from the station. It does not run through the AC-to-DC onboard charger.
A search for onboard charger splits into five questions. Each one has a section on this page:
- What the part does.
- Whether a bigger home charger makes the car charge faster.
- Whether DC fast charging uses the onboard charger.
- How many kilowatts AC charging can accept.
- Whether the kilowatt on a spec sheet is that converter.
What the onboard charger does
An onboard charger converts incoming AC from the charge port into DC for the traction battery, and it talks to the charging equipment while it watches voltage, current, temperature, and state of charge. That sentence is AFDC's component list for an all-electric car, not a brochure line.
The box on the wall is electric vehicle supply equipment. AFDC uses EVSE for the equipment you plug into. The supply equipment hands the car alternating current and a control signal. The converter that makes battery-ready DC from that AC sits in the car. A kilowatt is the rate and a kilowatt-hour is the energy. The onboard charger's rating is a rate.
AFDC also lists a separate DC/DC converter. That part steps the traction pack down to run accessories. It is not the charger you are asking about when the plug is in the car.
Will a bigger home charger make an EV charge faster?
A bigger home charger raises AC speed only until it meets the car's onboard charger. Past that rating, extra wall-box kilowatts sit unused.
The wall box is the supply
AFDC's charging page says charging time varies with state of charge, battery energy, battery type, the vehicle's internal charger capacity, and the equipment. The equipment is one factor. The internal charger is another. Buying the larger factor does not remove the smaller one.
Most residential Level 2 chargers, AFDC says, operate at up to 30 amps and deliver 7.2 kW. They need a dedicated 40-amp circuit under National Electrical Code Article 625. A Level 2 unit can range from 2.9 to 19.2 kW. Level 2 equipment can operate at 40 to 80 amps on 240-volt residential service or 208-volt commercial service.
The car sets the AC ceiling
If the car's converter is built for less than the wall box, the session follows the car. AFDC does not publish a single onboard-charger kilowatt for every model, and this catalog does not either. Read the vehicle specification for maximum AC input. The charging simulator is for session minutes once you already know the rate the car will accept. It does not fill in a missing onboard-charger field.
Overnight charging at that AC rate is the job described in AC fast charging. The inlet you plug into is a separate choice, covered in NACS versus CCS.
Does DC fast charging use the onboard charger?
DC fast charging does not use the onboard charger. The station supplies direct current, and the car's AC-to-DC converter is not on that path.
AFDC describes DC fast charging equipment as supplying direct current at outputs up to 500 kW, and notes that charging power still varies by vehicle and by battery state of charge. The onboard charger's job, on the same agency's component page, is to convert incoming AC. Those are two different currents.
DC fast charging is the page for the station side. The catalog sorts cars by the DC peak it stores on fastest charging EVs. That leaderboard is the DC number. It is not a ranking of onboard chargers.
How many kilowatts can AC charging accept?
On AC, the car accepts the lower of the equipment rating and its own onboard charger. AFDC's published equipment bands are below. They are not a census of cars.
| Equipment | What AFDC states | What reaches the car |
|---|---|---|
| Level 1 | 120 V. The range footnote assumes about 1.9 kW. | AC, through the onboard charger |
| Residential Level 2 | Up to 30 A, delivering 7.2 kW, on a 40 A circuit. | AC, through the onboard charger |
| Level 2 range | 2.9 to 19.2 kW. Equipment can be built for 40 to 80 A. | AC, still capped by the car's internal charger |
| DC fast | Up to 500 kW. | DC from the station, not through the AC converter |
Level 1
Level 1 is the portable cord on a household 120-volt outlet. AFDC's worked example is about 40 miles in 8 hours for a mid-size EV, under the 1.9 kW assumption in the footnote. The onboard charger still does the AC-to-DC conversion. The cord does not.
Level 2
Level 2 is the 240-volt or 208-volt equipment most homes and workplaces use. AFDC says nearly 80% of public U.S. charging ports in 2023 were Level 2. The 7.2 kW residential figure is the common installation, not a promise that every car will draw 7.2 kW. A car with a smaller converter draws less. A car with a larger converter can use more of a 19.2 kW unit only if the circuit can supply it.
Three-phase AC
AFDC also describes SAE J3068, a three-phase AC standard aimed at commercial sites, with target power from 6 kW to 130 kW. That is still AC charging, so an onboard converter is still in the path, sized for that supply. It is not the 150 kW DC median in this file. Charging levels keeps the Level 1, Level 2, and DC labels in one place.
Is the kilowatt on a spec sheet the onboard charger?
The kilowatt in this catalog is not the onboard charger. The stored field is fast_charge_kw, the car's peak DC charge rate. There is no onboard AC kilowatt column.
Snapshot of available rows on 21 September 2026. Available means is_available is true. The median is the middle of the 1,364 positive DC rates: both central values are 150 kW, so the median is 150 kW either as an average of the two middle rows or as the 50th percentile index.
| What the file stores | Count on 21 September 2026 |
|---|---|
| Available cars | 1,386 |
| Available cars with a DC peak above 0 kW | 1,364 |
| Available cars with no DC peak | 22 |
| Median DC peak among the 1,364 | 150 kW |
| DC peak under 50 kW | 66 |
| DC peak 50 to 99 kW | 117 |
| DC peak 100 to 149 kW | 443 |
| DC peak 150 to 249 kW | 492 |
| DC peak 250 kW or more | 246 |
Those bands are peak DC ratings in the catalog. They answer “how fast can this car take a DC station,” not “what AC rate will my driveway deliver.” Put two cars side by side in the comparison tool and the charge row is the same DC field.
Do not convert 150 kW into an onboard-charger average. A 7.2 kW home session and a 150 kW DC peak are different parts of the car. Using the DC median to size a wall box will overstate home charging by a wide margin.
Sources
- Alternative Fuels Data Center, “How Do All-Electric Cars Work?” Onboard charger: incoming AC to DC for the traction battery, plus communication and monitoring. https://afdc.energy.gov/vehicles/how-do-all-electric-cars-work
- Alternative Fuels Data Center, “Electric Vehicle Charging Stations.” Internal charger capacity, Level 1 at about 1.9 kW, residential Level 2 at 7.2 kW, Level 2 range 2.9 to 19.2 kW, DC fast up to 500 kW, SAE J3068 at 6 to 130 kW. https://afdc.energy.gov/vehicles/electric_charging.html
- evstats.org
cars-summary.json, 21 September 2026. 1,390 rows, 1,386 available.fast_charge_kwpositive on 1,364 available rows, median 150 kW. No onboard AC kilowatt field.