What EV Charger Do You Need for a 2027 Mercedes-Benz EQS 400?
Wiring a NEMA 14-50 outlet and landing it on a 50 amp breaker brings Level 2 charging straight to your garage. Your Mercedes-Benz EQS 400 draws up to 40 amps to fill its 134.2 kWh battery. You need a 40 amp EVSE to hit that speed. Anything larger is a waste of money because the car caps its AC intake at 40 amps.
The numbers
| Maximum AC charging rate | 9.6 kW (40 A) |
|---|---|
| Charger size to buy | 40 A |
| Circuit breaker required | 50 A |
| Outlet / connection | NEMA 14-50 outlet |
| Charge port | J1772 |
| Full charge on Level 2 | about 14.0 hours |
| Range added per hour (Level 2) | about 22 miles |
| Full charge on a 120 V outlet | about 93 hours |
| Range added per hour (120 V) | about 3.3 miles |
| EPA rated range | 312 miles |
| Energy for a full charge | about 134.2 kWh at the wall |
Why 40 amps and not more
Charging at 40 amps puts 22 miles of range into the battery every hour. A full recharge takes 14.0 hours from empty. Buying a 48 amp or 80 amp charger changes nothing for the car. The onboard charger restricts power flow to 40 amps maximum. Save your cash and buy a unit rated for 40 amps.
What the install involves
Have a licensed electrician pull a heavy copper circuit to your garage wall. The breaker must be rated for 50 amps to supply a 40 amp continuous load safely. Check that your home electrical panel has spare physical space and load capacity before buying parts. Plug in a unit like the ChargePoint Home Flex or Grizzl-E Classic 40A to the NEMA 14-50 outlet.
Chargers that match this car
Rugged metal enclosure, built for outdoor use.
Portable cordset. Works on 120 V or a 240 V outlet.
Plugs into an existing 14-50 outlet, no hardwiring.
Worth having as well
Common questions
- What connector does this car use?
- It uses a J1772 connector. This model year falls in the industry's NACS transition. Many 2025+ vehicles ship with a NACS port but include a J1772 adapter, so a J1772 home charger still works. Confirm your car's port before buying.
- Can I use a standard wall outlet instead?
- Level 1 charging on a standard household outlet gives you 3.3 miles of range per hour. A full recharge takes 93 hours. You need a Level 2 setup for daily driving.
- Do I need to hardwire the charger?
- No. You can plug a unit like the ChargePoint Home Flex directly into a NEMA 14-50 outlet. Hardwiring is also an option if you prefer a permanent connection.
- How does the EPA charging time compare?
- The EPA rates the Level 2 charging time at 14.0 hours to full. That matches the car's peak AC rate exactly.
Other vehicles
Charging times derived from EPA data for the 2027 Mercedes-Benz EQS 400. Electrical requirements follow NEC 625.41, which sizes a circuit at 125% of a continuous load. Always have a licensed electrician verify your panel.