Officially confirmed: the CLA EV’s 800-volt architecture is incompatible with 400-volt charging stations
The highly anticipated electric Mercedes-Benz CLA, boasting impressive efficiency and rapid charging up to 320 kW thanks to its 800V architecture (akin to a smaller, more affordable Lucid Air), comes with a significant charging limitation: it cannot utilize 400V DC fast chargers.
This limitation, confirmed by Mercedes-Benz representatives in both Europe and the US following an observation by a Norwegian EV enthusiast, means the new CLA EV can only recharge at 800V DC fast-charging stations. While this allows it to leverage its high-speed charging capabilities where compatible infrastructure exists, the majority of DC fast chargers currently available in the United States are limited to around 400V.
Consequently, the CLA EV will only be compatible with a relatively small number of DC fast chargers in the US, effectively negating a key technological advantage for many owners. This severely restricts its usability for road trips, at least in the current charging landscape.
Interestingly, despite being equipped with a Tesla-designed NACS charging port (the standard in the US), the CLA EV cannot take advantage of the extensive Tesla Supercharger network, as it doesn’t currently support 800V charging in the US. Owners would need a CCS1 adapter to use the limited number of non-Supercharger 800V stations, which typically offer CCS1 plugs.
Furthermore, the CLA’s NACS port, while capable of AC charging, is inexplicably disabled for AC charging, forcing US owners to rely solely on J1772 chargers for slower home or public charging.
Mercedes-Benz is explicitly relying on the expansion of 800V charging infrastructure by providers like Electrify America (which already operates at 1000V) to overcome this limitation. While other 800V-capable EVs like the Lucid Air, Porsche Taycan, Hyundai Ioniq 5, and Kia EV9 can also utilize older 400V chargers (albeit at reduced speeds), the CLA EV lacks this crucial fallback option, potentially hindering the ownership experience in areas with limited 800V availability. Mercedes-Benz has stated that this hardware limitation cannot be resolved with a software update.
