HUB 05 · The Charge Curve
EV Charge Curves by Model
The same fact, three ways: why an 800-volt Ioniq 5, a Tesla Model 3 and a Chevy Bolt post wildly different real-world charge times.
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The point of this page is not a spec-sheet dump; it is to show, with real examples, why the peak kW figure is a poor guide to how long you will actually wait. Below are three cars that bracket the range - an 800-volt speed champion, a 400-volt car that charges well, and a 400-volt car that charges slowly - so you can see how architecture and curve shape, not just peak power, decide the outcome. Every figure is a manufacturer claim or widely-reported result under favorable conditions; treat them as a guide and verify against your exact model year.
How to read these numbers. These are ideal-condition figures - warm battery, low starting charge, a charger that delivers full power. Real-world times run longer, especially in the cold. We do not measure charge curves ourselves; these are compiled from the manufacturers and the reporting linked in Sources, and charge behavior can change with battery suppliers and software updates.
Three cars, three curves
| Model | Architecture | Approx. peak | Claimed 10-80% | What the curve does |
|---|---|---|---|---|
| Hyundai Ioniq 5 / Kia EV6 | 800V | ~235 kW (up to 350 kW station) | ~18 min | Holds high power well; the 800V advantage in action |
| Tesla Model 3 / Model Y | 400V | ~250 kW | ~15-30 min | High peak, tuned curve; Model 3 faster than the heavier Y |
| Chevrolet Bolt EV / EUV | 400V | ~55 kW | ~60 min | Low, early-tapering curve; a genuinely slow fast-charger |
What the table is really telling you
Look at the Tesla and the Ioniq 5. The Tesla's peak (~250 kW) is actually higher than the Ioniq 5's real peak (~235 kW), yet the 800-volt Ioniq 5 finishes 10-80 percent in a similar or shorter time. That is the curve doing the work: the Ioniq 5 holds power across more of the window, while a 400-volt car tapers sooner. Peak alone would have you rank them the other way.
Then look at the Bolt. Its ~55 kW peak is a fraction of the others', and it tapers early, so a 10-80 percent DC session runs around an hour - fine for the occasional trip, painful as a road car. The Bolt is an excellent value EV whose weakness is precisely this: the charge curve. Interestingly, a low-and-flat car like the Bolt sees little benefit from a 350 kW charger, and even the Ioniq 5 gains little from 350 kW over a good 150-plus kW connector once you account for real conditions - a point reporting on the Ioniq 5 has made directly.
What about the other cars?
The same framework reads across the market. Premium 800-volt cars such as the Lucid Air and the Porsche Taycan sustain very high power and are among the fastest-charging EVs sold. Mainstream 400-volt crossovers like the Ford Mustang Mach-E and many others sit in the middle - respectable peaks that taper earlier than an 800-volt car. Rather than trust any single peak figure, find your model's published 10-80 percent time and, better still, a measured charging-curve graph, and weigh the average power, not the spike. We keep this page focused on well-documented archetypes so the numbers stay honest; the method matters more than any one row.
Does this affect home charging?
No. Everything here is about DC fast charging on the road. At home you are on Level 2 AC charging, where the rate is flat and capped by your circuit and the car's onboard AC charger - typically 7.7 to 11.5 kW - not by the DC curve. A car with a mediocre DC curve can still charge perfectly well overnight at home. The charge curve matters when you shop for a road-trip car and when you plan stops, which is where the DC fast charging explainer and the public networks guide come in.
Questions
Frequently asked
Which EVs charge the fastest?
As a rule of thumb, 800-volt cars like the Hyundai Ioniq 5, Kia EV6, Lucid Air and Porsche Taycan hold high power longest and post the quickest 10-80 percent times. But a well-tuned 400-volt car like the Tesla Model 3 is competitive, because how long a car holds power (average power) matters more than its peak.
Why is the Chevy Bolt so slow to fast-charge?
The Bolt peaks at only about 55 kW and its curve tapers early, so a 10-80 percent DC session runs roughly an hour. It is a strong value EV for home charging and short trips; it just is not built for rapid road-trip charging. Its slow curve, not the charger, is the limit.
Do I need a 350 kW charger?
Only if your car can use it, and even then the benefit over a good 150-plus kW charger is often small once you account for the curve and real conditions. A car that peaks at 150 kW gains nothing from a 350 kW stall. Match the charger to what your car actually accepts.
Keep reading
Related
Receipts
Sources
- Green Car Reports - Ioniq 5 road-trip charging (350 kW vs 150 kW)
- Kelley Blue Book - how long to charge a Tesla
- InsideEVs - Chevrolet Bolt EV DC fast charging
- US DOE AFDC - EV charging infrastructure
We do not run a testing lab, and we do not pretend to. Where a measured number came from someone else's lab, we name them and link them. Where we could not verify something, we say so on the page rather than quietly leaving it out. Read our full method.