Efficiency measurement

Faults and Technical chat for the Volkswagen ID.3
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HeidiFlowerpt Driver
Posts: 251
Joined: Tue Dec 01, 2020 2:30 pm

Post by HeidiFlowerpt Driver »

In the far distant past (!) when I drove an ICE car, I was the kind of nerd who obssessed about fuel consumption. With my ID.3 I'm being forced to relinquish my obssession.

I hoped to achieve 5M/kWh but in my pattern of UK driving I don't get above 4M/kWh, and on short winter journeys I get 3 - 3.5M/kWh.

I see reviews on Youtube claiming over 4M/kWh in Hyundai vehicles and others. Am I heavy-footed, or is my ID.3 very inefficient?

Also, I wish there was an agreed standard unit for energy efficiency - M/kWh, Km/kWh, Wh/KM, kWh/100kM. If I'm using one unit and a reviewer is using a different one, it's annoying to have to convert!
ID.3 1st Edition Manganese Grey - called Heidi Flowerpot

monkeyhanger
Posts: 1273
Joined: Sat Mar 20, 2021 1:33 pm

Post by monkeyhanger »

A lot of those Hyundais have a 38kWh battery - there's about 1535kg kerb weight to pull. The 64kWh version, more in line with an ID3 Pro Performance in output (204ps) and battery capacity is 1635kg - its pulling about 15% less weight than the ID3, no wonder its more efficient.
Cupra Born V2 e-boost 230ps Aurora Blue, replaced ID3 PP Family

Audi S3 - because I hate rapid charging for long distance driving.

Octopus referral: https://share.octopus.energy/lush-fawn-565
G43FAN

Post by G43FAN »

5 miles/kWh is about 0.5 above the WLTP figures, you were never going to get anywhere near 5?

As Monkeyhanger says the Hyundais with a Kona 39kWh battery have
WLTP Ratings
Range 190 mi
Rated Consumption 230 Wh/mi
Vehicle Consumption 207 Wh/mi
1610kg

The Kona 64 kWh version has
WLTP Ratings
Range 301 mi
Rated Consumption 237 Wh/mi
Vehicle Consumption 213 Wh/mi
1760Kg

Whilst the ID 62kWh
WLTP Ratings (TEL)
Range 265 mi
Rated Consumption 248 Wh/mi
Vehicle Consumption 219 Wh/mi
1812kg
So yes it's less efficient and heavier.

Figures from https://ev-database.uk/
HeidiFlowerpt Driver
Posts: 251
Joined: Tue Dec 01, 2020 2:30 pm

Post by HeidiFlowerpt Driver »

G43FAN wrote: Sun Jan 16, 2022 6:04 pm 5 miles/kWh is about 0.5 above the WLTP figures, you were never going to get anywhere near 5?

As Monkeyhanger says the Hyundais with a Kona 39kWh battery have
WLTP Ratings
Range 190 mi
Rated Consumption 230 Wh/mi
Vehicle Consumption 207 Wh/mi
1610kg

The Kona 64 kWh version has
WLTP Ratings
Range 301 mi
Rated Consumption 237 Wh/mi
Vehicle Consumption 213 Wh/mi
1760Kg

Whilst the ID 62kWh
WLTP Ratings (TEL)
Range 265 mi
Rated Consumption 248 Wh/mi
Vehicle Consumption 219 Wh/mi
1812kg
So yes it's less efficient and heavier.

Figures from https://ev-database.uk/
Thanks for this helpful info. What is the difference between 'rated consumption' and 'vehicle consumption'? It appears 'vehicle consumption' shows greater efficiency than 'rated consumption'?

If I've got my sums right, 219 Wh/mi equates to 4.57M/kWh or thereabouts, and 248Wh/mi is 4.1M/kWh - both figures I fail to match. Although I suppose I probably could get somewhere near that if I did a journey in summer, at 56MPH and without heating or aircon...

I checked the EV Database website, a great resource, thanks for the link. It rates my car at 270 Wh/M, and browsing the database that's fairly good, only a couple of Teslas and some smaller cars with smaller batteries do better. And 270Wh/M is 3.7M/kWh, and I get quite close to that, so I'm happy...
ID.3 1st Edition Manganese Grey - called Heidi Flowerpot
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