800V Architecture

The physics argument

EV packs operate at a nominal voltage - either around 400V (most vehicles) or around 800V (a smaller group). The voltage matters for charging speed because of basic electrical physics: Power = Voltage × Current.

To charge at 200 kW through a 400V system, you need 500 amps of current. That’s a lot of current to push through cables and connectors without generating excessive heat. At 800V, the same 200 kW requires only 250 amps - half the current, much less heat, and the ability to use thinner, lighter cabling.

Which vehicles use it in Australia

800V architecture arrived in Australia primarily through the Hyundai/Kia E-GMP platform:

• Hyundai IONIQ 5 and IONIQ 6 - up to 220 kW and 233 kW DC respectively
• Kia EV6 and EV9 - up to 233 kW DC
• Genesis GV60 and GV80 Coupe EV
• Porsche Taycan and Macan EV - among the first production 800V vehicles globally
• Audi e-tron GT and Q6 e-tron - share Porsche’s J1 platform

Most other manufacturers - Tesla, BYD, Volkswagen Group’s MEB platform, Toyota, Volvo - currently use 400V architectures. That doesn’t mean they’re slow: a 400V vehicle with a 150–170 kW DC capability is still fast enough for practical road tripping.

Charging at 400V infrastructure

An 800V vehicle doesn’t require an 800V charger. At a standard 400V DC charger, the vehicle uses a built-in DC-to-DC converter to step up the charger’s output to the pack voltage. The IONIQ 5, for example, charges at up to 100 kW on a 50 kW or 100 kW charger, then unlocks its full 220 kW peak on a 350 kW ultra-rapid unit.

This backwards compatibility is important: Australia’s charging network is still dominated by 50 kW and 75 kW units, so 800V vehicles can use them without issue, just not at their peak rate.

Real-world times

A Hyundai IONIQ 6 Standard Range (53 kWh) charges from 10% to 80% in under 18 minutes on a 350 kW charger. The Long Range (77 kWh) hits 80% in about 25 minutes. For context, a 400V vehicle with a 60 kWh battery charging at 100 kW takes about 32 minutes for the same window.

These differences matter on multi-stop road trips but are largely irrelevant for daily home charging.