Remote Charging

[hywel]

I have an HS PHEV TROPHY 2025. Recently I have heated the car in the morning via the MG remote app. Although plugged into a live mains supply the car heated from the battery and as such reduced my 75 mile range. I thought that the car would prioritise taking power from the mains not the battery. Is what happened correct or should it have heated from the mains supply.

 

[Totti1001]

I have a measuring device on my charger. When I start the heating via the app, it draws power from the car battery but at the same time continues to charge from the mains socket. I have set my charger to 5 kW, but that doesn't seem to be enough, because even though it charges the car with 5 kW from the mains socket, the battery still loses 2-3% in 10 minutes.

 

[Noel]

My understanding is that the heater/heated seats are powered by the traction battery, this is support by the fact that there is near instant warmth, much like a household fan heater. If I’m stationary and put on the heater the miles go down. But then they slowly go back up again as I drive.
My conclusion is that it’s possible that the heater is drawing more power than your charger is capable of supplying. I have a 32amp EVDANCE ‘granny” charger, but admit I haven’t used the heater whilst charging, so to be honest I don’t really know, but it sound feasible.

 

[mystreet]

I believe that the electric bits that are the same as an ice car are the same in any EV. Seats, lights, etc. But, as an EV does not have an alternator, if the 12V battery gets low the traction battery tops it up. So, have seats heater on and a low 12V battery could draw a charge from the big battery.

 

[vimes]

I have a measuring device on my charger. When I start the heating via the app, it draws power from the car battery but at the same time continues to charge from the mains socket. I have set my charger to 5 kW, but that doesn't seem to be enough, because even though it charges the car with 5 kW from the mains socket, the battery still loses 2-3% in 10 minutes.

5kW? Max socket load in uk is 3 kW.

 

[hywel]

5kw? Max socket load in uk is 3 kw

Thanks that is what I thought. Heating is a heavy drain on the battery.

 

[Noel]

I believe that the electric bits that are the same as an ice car are the same in any EV. Seats, lights, etc. But, as an EV does not have an alternator, if the 12V battery gets low the traction battery tops it up. So, have seats heater on and a low 12V battery could draw a charge from the big battery.

Sort of, to clarify my understanding is that the engine simply spins a generator to supply power to the electric motor, it is never directly connected to the front wheels.
Agreed, that the 12v battery, internal heating, heated seats, et cetera are all powered by the traction battery. When driving the software controls the engine so that it provides electrical power when needed, for acceleration, charging the traction battery and ancillary equipment.

 

[BPM06]

Sort of, to clarify my understanding is that the engine simply spins a generator to supply power to the electric motor, it is never directly connected to the front wheels.
Agreed, that the 12v battery, internal heating, heated seats, et cetera are all powered by the traction battery. When driving the software controls the engine so that it provides electrical power when needed, for acceleration, charging the traction battery and ancillary equipment.

Also, my assumption.
I’m not complaining, but that being the case; I often wonder why a turbocharged 1500cc petrol engine is needed to charge the battery in my mind it looks like “over-kill” since that engine is used quite effectively to drive the HS in its non-electrified state.
But I’m no physicist or mechanic. Maybe the forum will put me in my place.

 

[SRP1]

The engine can drive the car to provide extra power for maximum acceleration and power, also at high speed, so I understand.

 

[Totti1001]

5kW? Max socket load in uk is 3 kW.

I have a fixed installation, not with a socket.