The Charge Curve

The number printed on a DC fast charger - 150 kW, 250 kW, 350 kW - is a peak an EV touches for a moment, not a speed it holds. What actually happens is a curve: power ramps up, holds near the peak for a while, then tapers off as the battery fills. That shape, the charge curve, is what decides real fast-charging time - and it is the data almost every buying guide leaves out. This hub is the site's namesake, and its reason for existing.

Start with how it works

Read DC fast charging explained first: it covers why the curve exists (battery chemistry and thermal limits), why 10-80 percent is the interval that matters (the last 20 percent is deliberately slow to protect the pack), and why two cars rated at the same peak kW can post very different real-world times.

How the topic divides

• Peak vs average power. A car that hits 250 kW briefly but averages 120 kW across a session can lose to a car with a lower peak that holds it longer. Average power across 10-80 percent is the honest metric.
• Architecture. 800-volt platforms generally sustain high power better than 400-volt ones. We explain what that means in charge curves by model.
• Where you charge. The network and connector matter too - see public charging networks.

Why this matters for a home buyer

Fast charging is a road-trip and occasional tool, not your daily driver - for that you want a Level 2 home charger, where the "curve" is basically flat and the limit is your circuit and the car's onboard AC charger, not the battery. But understanding the DC curve tells you what to expect on a trip, which cars road-trip well, and why the headline kW figure on a charger is marketing, not a promise. Everything here is compiled from published manufacturer specs and named sources - we do not measure charge curves ourselves, and we say so.

The mistake people make

Shopping on peak kW alone. A higher peak looks better on a spec sheet, but a car that holds a moderate power level across the whole 10-80 percent window will often finish first. When you read a charge-curve figure here, it is the manufacturer's published claim with the source linked; check it against your specific model and model year, because curves change with battery suppliers and software updates.