Efficiency Reading Accuracy on ZS EV

[SignallerBrian]

I was suspicious of the accuracy of the Power consumption figure given on the Information centre in my 2023 ZS EV Trophy LR display, so I decided to check it.

At the start of the test, I reset the accumulated totals on the Information centre and charged the car to 80%. For about the next month I recorded exactly how much electricity I added to the battery and at the end of the month ensured the car was charged back up to 80%. I only charge at home so I know the kWhs added are accurate. In that time, I did a total of 286.1 miles and added a total of 157.9kWhs. At the end, the efficiency value on the Accumulated totals on the Information centre read 2.2 mls/kWh. However calculating from the above figures, I get an actual efficiency of 1.8 mls/kWh which is quite a discrepancy.

Does anyone know whether this might be because the car figures do not include ancillary equipment like Air Con, heating, lights etc or is it just really inaccurate? This test was carried out in the Winter and I was using the pre-heating in the morning a lot and heating on my journeys. Also, most of the journeys during the test were short.

 

[DBedford]

I may look at doing a similar test with our ZS TLR. But what ever the results its far less expensive to run than our old petrol or diesel. Don't forget to factor in charging losses of 10-30%, slower the charge (typically 7kW at home) the higher the losses are as a percentage of the charge.

 

[SignallerBrian]

I may look at doing a similar test with our ZS TLR. But what ever the results its far less expensive to run than our old petrol or diesel. Don't forget to factor in charging losses of 10-30%, slower the charge (typically 7kW at home) the higher the losses are as a percentage of the charge.

Thanks, I hadn't thought about charging losses. I agree EVs are way cheaper than ICE especially as I am on Intelligent Octopus so charging is 7p/kWh.

 

[fred12345]

This test was carried out in the Winter and I was using the pre-heating in the morning a lot and heating on my journeys. Also, most of the journeys during the test were short.

Could it be that you were preheating the car whilst charging so that the car was taking more kW in then spending driving? Or preheating in advance doesn't count as driving consumption so the figures are off?

 

[PVperson]

My best efficiency on a SR MG5 was 5.3miles/kWh, over 111.4miles. Driving around 50mph behind lorries! Here's a picture for those who won't believe it. Mostly on M1.
At that rate my range would be 301miles! (on a SR)

 

[DBedford]

All is good, until they brake suddenly!

 

[PVperson]

A lorry can't brake faster than I can! so if you have slower reactions, just follow a bit further back!
BTW, you don't have to be too close to the lorry, if it's high, it leaves a long slipstream behind it. Have the MG in Volts-Amps-RPM screen (pity it doesn't have mph in the spare quarter!) and you can see the amps drop considerably when you are in the slipstream.

 

[PVperson]

Could it be that you were preheating the car whilst charging so that the car was taking more kW in then spending driving? Or preheating in advance doesn't count as driving consumption so the figures are off?

On a cold morning, put a fan heater in front of the drivers' seat, for 20min, you won't need to use the heater for 30min at least! (and wear a coat)

 

[crispyjay]

A lorry can't brake faster than I can!

Darwin’s law in action!