Charging rate at 9.7 KW
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2024 AMG EQE SUV , 2021 E63S Wagon - gone, 2018 E63S Sedan - gone
Charging rate at 9.7 KW
My AMG EQU SUV is always charging at 9.7KW. This is reported by the car and my Wallbox charger. Not a big increase over the specification of 9.6KW, but every bit helps. Can the charge rate be increased to 11.5KW? My level 2 charger is capable of 48 amps.
Last edited by HBerman; Jan 26, 2024 at 12:08 PM.
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From: Louisville, KY
2023 EQE350 4MATIC, 2023 EQE 350 4MATIC SUV, 2015 E250 BlueTEC 4MATIC, 1995 E300 Diesel
The 9.7kW happens when your voltage is a bit higher, say 242-243V on L1/L2. While frequency is very tightly regulated on the grid, you will often see voltage sag or rise above the nominal 120/240 voltage point. Especially if loads in your neighborhood or distribution point are low or high. Sometimes you'll see 9.5 kW as well. Thus, you're still limited to 40 amps, but your grid voltage has gone a bit higher than 240V, so your EVSE will pass that along to the onboard charger, which will then send it to the battery just a little faster.
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
No, the rate is set by MB in the vehicle. I think they set it at 9.6kw to help preserve the life of the battery. It reduces the heat created during charging, a little bit, which will help to keep the HV battery heathy longer.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 2,550
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From: Cary, NC
2024 AMG EQE SUV , 2021 E63S Wagon - gone, 2018 E63S Sedan - gone
The 9.7kW happens when your voltage is a bit higher, say 242-243V on L1/L2. While frequency is very tightly regulated on the grid, you will often see voltage sag or rise above the nominal 120/240 voltage point. Especially if loads in your neighborhood or distribution point are low or high. Sometimes you'll see 9.5 kW as well. Thus, you're still limited to 40 amps, but your grid voltage has gone a bit higher than 240V, so your EVSE will pass that along to the onboard charger, which will then send it to the battery just a little faster.
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 2,550
Likes: 745
From: Cary, NC
2024 AMG EQE SUV , 2021 E63S Wagon - gone, 2018 E63S Sedan - gone
I think that the limit is set by the AC -> DC convertor. The DC input can be as high as 170KW from a Level 3 charger.
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2023 EQE350 4MATIC, 2023 EQE 350 4MATIC SUV, 2015 E250 BlueTEC 4MATIC, 1995 E300 Diesel
Last edited by bytemaster0; Jan 26, 2024 at 11:44 PM.
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2012 C63;1971 280SE 3.5(Sold);2023 EQS 450 SUV 4 Matic (Wife's)
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2024 AMG EQE SUV, 2022 Audi e-tron GT Performance
1) Many EVs in the US support 11.5kW L2 charging (240V * 48A), including two e-trons I’ve owned (SUV and GT); only the Nissan Leaf and the Fisker Ocean (off the top of my head) were notorious for aiming low at 32A (7.6kW)
2) the 40A cap on the MB’s onboard charging equipment is purely a cost-saving move, plain and simple (see 3. below for MB’s reason for not supporting two different onboard chargers globally)
3) the US (residential) uses split-phase 240V while Europe has available 3-phase that supplies 240V/400V (usually between 32A and 50A, 48A being quite common); certain European Audi models support 19.2-22kW charging
2) the 40A cap on the MB’s onboard charging equipment is purely a cost-saving move, plain and simple (see 3. below for MB’s reason for not supporting two different onboard chargers globally)
3) the US (residential) uses split-phase 240V while Europe has available 3-phase that supplies 240V/400V (usually between 32A and 50A, 48A being quite common); certain European Audi models support 19.2-22kW charging
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