Energy consumption screen - really?

[jamherber]

So for the first time since owning the car, I had a quick look at the energy consumption screen today, just for interest, and it seems to be reporting incorrect, optimistic data?

So my 12 mile hilly commute this morning, the car used 7% of the battery (so ~4.3kwh of battery) - the report shows only 3kwh being used. Also the average consumption over the past 50 miles is showing as 6 miles/kwh? Now that would be stunning but it should be nearer 3.8 miles/kwh.

Does anyone else's screen provide fantasy figures or is it just a 'quirk' of our car?

 

[siteguru]

Mine's the same - I just treat it as a "pretty graph" page and don't believe anything it says.

PS - mine's the other way round, with the graph on the left and the pie chart on the right.

 

[Daedalusminos]

Well those figures are only to 1 significant place with 0 decimal places. 6 miles/kWh should be 5.5 to 6.5ish....but who's to say it's not 5.1 to 6.1 ish.

Don't forget all these figures are probably power drawn from the battery, not actual power from the grid since the charging has inefficiencies.

 

[jamherber]

Well those figures are only to 1 significant place with 0 decimal places. 6 miles/kWh should be 5.5 to 6.5ish....but who's to say it's not 5.1 to 6.1 ish.

Don't forget all these figures are probably power drawn from the battery, not actual power from the grid since the charging has inefficiencies.

Yeah get that but the highest we’ve seen on the trip meter during this time was 4.3 mi/kWh, normally closer to 3.3 so either way it’s miles out.

 

[JonnyG]

So for the first time since owning the car, I had a quick look at the energy consumption screen today, just for interest, and it seems to be reporting incorrect, optimistic data?

So my 12 mile hilly commute this morning, the car used 7% of the battery (so ~4.3kwh of battery) - the report shows only 3kwh being used. Also the average consumption over the past 50 miles is showing as 6 miles/kwh? Now that would be stunning but it should be nearer 3.8 miles/kwh.

Does anyone else's screen provide fantasy figures or is it just a 'quirk' of our car?

Look like you had around 1 kWh of regen benefits on top of the 3kWh? ... so that makes it nearer the the ~4.3 kWh of battery.

 

[jamherber]

Look like you had around 1 kwh of regen benefits on top of the 3kwh ? ... so that makes it nearer the the ~4.3kwh of battery.

Wouldn't the regen reduce the total power usage though so if the 3kWh didn't include it, it would be 2kWh overall?

 

[JonnyG]

Wouldn't the regen reduce the total power usage though so if the 3kWh didn't include it, it would be 2kWh overall?

mmmm not sure ..... you may well be right !!

 

[OriginalBigAl]

I'm also confused by this . Last night , charged from 32% back to 80% calculated around 29 kWh. This morning the charging box reported 30 kWh imputed . This covered 187km of usage and with some usage for electricals gave around 6.5 km/kWh.
Before charging the energy consumption screen said there had been 11kWh of regen produced which has presumably gone back into the battery.
Allowing for some wastage in charging and the reported 1kWh for ancillaries has the car used 40kWh to cover this distance at around 4.6 km/kWh. ( 30 imputed plus the 10 regen )
Most of this distance was back roads, hilly and twisty and town driving, hence the level of regen.
Had this been steady motorway driving with little regen is this the level I can expect or worse with a higher speed and more aerodynamic resistance.
What are you mainly motorway drivers experiencing , is less than 3miles/kWh in summer normal if your regen levels are low?
I'm sure I'm missing something here, but I cannot seem to get all the various reported figures from the car to tally along with what is put in through the charge box.

 

[JonnyG]

..........What are you mainly motorway drivers experiencing , is less than 3miles/kWh in summer normal if your regen levels are low?

Motorway speed limits here in the UK are 70mph. If I drive "around" this speed I typically average 3mls/kwh at the moment, certainly no more as on long journeys ?

 

[EV convert]

Instead of worrying about the 'guess o meter' (GOM) or what comes from regen, I simply divide the mileage by the charge added (from Zappi or commercial charge point) as these are the figures that matter. Over last year this averaged 3.47m/kWh while monthly totals ranged from 2.5 to 4.7 - although this is influenced by when the car if charged (ie on 1st or last of the month).

Throughout this time the dashboard display (in 'From start' mode) has ranged from 2m/kWh (winter with heater on) to 20m/kWh! On motorways it ranged from high 2s to high 3s.

 

[OriginalBigAl]

Instead of worrying about the 'guess o meter' (GOM) or what comes from regen, I simply divide the mileage by the charge added (from Zappi or commercial charge point) as these are the figures that matter. Over last year this averaged 3.47m/kWh while monthly totals ranged from 2.5 to 4.7 - although this is influenced by when the car if charged (ie on 1st or last of the month).

Throughout this time the dashboard display (in 'From start' mode) has ranged from 2m/kWh (winter with heater on) to 20m/kWh! On motorways it ranged from high 2s to high 3s.

This is my normal way of calculating consumption, and the figures I get match yours. Whilst I'm not worried by the cars usage or performance I do find that I cannot mathematically match in the re-gen KW in any meaningful way which makes sense, either in range or the amount of re-charging KWs. I don't use motorways enough to collect data from that type of travelling so hence the question. Its a bit of a puzzle and I've got in my head I need to solve it.