South Korea Has Just 796 Chargers of 350 kW or More for 800V EVs

By site, just 251 of about 14,000 fast-charging stations, or 1.79%, have such a charger. More than 70% of them are at highway rest areas, so they are of little use for daily urban driving. A ministry official confirmed that nearly all are concentrated at rest stops.

Why cities lag

Running several 350 kW chargers requires large high-voltage power intake and liquid-cooled cables. Older commercial buildings and residential areas in cities have saturated grid capacity, and grid connection costs are heavy.

Ordinary urban fast chargers fall short too. Most 200 kW units limit current to 200 to 250 A to prevent cable overheating, so an 800V car receives only 140 to 175 kW in practice. With dynamic load balancing, where one unit charges two cars, output drops to 100 to 150 kW, and reaching 80% can take 30 to 40 minutes.

Carmakers say 800V systems improve efficiency, reduce wiring weight and help thermal management, but argue that marketing without matching infrastructure breeds consumer distrust. Kim Pil-soo, a professor at Daelim University, said 10-minute charging claims without urban ultra-fast infrastructure only deepen distrust, and called on the government to design new support that eases high-cost and grid regulations.