Jay_in_Austin
Well-Known Member
- First Name
- Jay
- Joined
- Aug 10, 2022
- Threads
- 2
- Messages
- 49
- Reaction score
- 26
- Location
- Austin Texas
- Vehicles
- 2022 Mustang Mach-E
- Occupation
- Retired
- Thread starter
- #1
I did some checking on the 12A/32A Webasto EVSE that comes with the MME. The wall plug adapter is what sets the charging current. With the 120V plug, the charging current is set to 12A independent of the input voltage. If you make an adapter and apply 240VAC input to the 120V plug, the car will still charge at 12A. The input power will be 2.88KW and the battery will charge twice as fast as on 120VAC input. Some of us will have a 15 or 20A 240VAC outlet available so we could take advantage of the faster charging. Note that the plug on the EVSE should not be changed because it has a built-in temperature sensor.
The current control pulse sent to the car is 20% duty cycle with the 120V plug. It is 53.4% duty cycle with the 240V plug. My guess is that the value of a capacitor across the temperature sensing resistor sets the duty cycle of the pulse. That would also reduce the duty cycle and charging current if the plug got hot. If someone knows for sure how the plug sets the duty cycle, please share that information.
The current control pulse sent to the car is 20% duty cycle with the 120V plug. It is 53.4% duty cycle with the 240V plug. My guess is that the value of a capacitor across the temperature sensing resistor sets the duty cycle of the pulse. That would also reduce the duty cycle and charging current if the plug got hot. If someone knows for sure how the plug sets the duty cycle, please share that information.
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