Electric vehicles miles per KWh

GreatApe

Headline for a Tesla model 3 is 4.1 miles per KWh but is 2.6 miles per KWh more honest?

Someone doing average UK mileage 7,100 miles should budget closer to
2,540 KWh per year rather than 1,730 KWh, a significant difference

Cost per mile is also therefore not really electricity price / 4.1 but is closer to electricity price / 2.8



50 watt average electrical useag when not in use and just self discharge
7,100 miles (average UK vehicle) used for 250 hours a year
425 KWh used when not moving
1730 KWh for motion of 7,100 miles
85% charge efficiency?
2.8 miles per KWh out of the socket or about 2.6 miles/KWh out of the power station

markin

At 11min you can see the data since last charge, https://www.youtube.com/watch?v=JpoaJ259FHE Robert is getting 270 to 280 Wh/mile, So around 4 miles per KWH


24.2 miles and 7kwh

michaels

2015 Leaf showing 4.8 miles per km over the last 2k but that is driven gently iand n summer when consumption Is lower. Also need to subtract 10% approx charging loss

Martyn1981

I seem to recall that folk are reporting nearly 5 miles/kWh for the Kona, and Tesla models are 'famed' for their efficiency, especially considering the size and weight of the S & X.

Some of the others like the Jag and Audi ..... not so good.

JKenH

Interesting thread. I hadn’t given much thought to losses while the vehicle is standing idle. I am hoping to get an EV eventually. I did order a Golf GTE hybrid a couple of years ago but 9 months later the car hadn’t appeared so I gave up and bought another diesel and some solar panels with the change. Our usage pattern would suit a hybrid (up to 30 mile round trips, typically every other day) but thinking of going the whole hog to BEV as we do have 3 other vehicles we can use for long trips.

Potentially, if we get a hybrid, charge it up after use and then not use it for a couple of days then we would lose 25% of its battery capacity, or more if we left it standing longer which might happen.

It’s all small beer compared to the capital cost but I would be interested to hear real life BEV and PHEV experiences.

EricMears

markin wrote: »

At 11min you can see the data since last charge, https://www.youtube.com/watch?v=JpoaJ259FHE Robert is getting 270 to 280 Wh/mile, So around 4 miles per KWH

24.2 miles and 7kwh

Not sure whether this thread is about a particular model or BEVs in general ?

FWIW, my Leaf has averaged 4.1 miles/kWh according to its own figures but only 3.6 when I divide the miles travelled by kWh added. The difference isn't particularly 'sinister' - it turns out that the car is measuring power that leaves the battery and I'm using power that's been added. The 'discrepancy' is a measure of the charging efficiency - i.e. approx. 15% of the power I add to the car is wasted (probably as heat generated in the charger)

Dave_Fowler

Martyn1981 wrote: »

I seem to recall that folk are reporting nearly 5 miles/kWh for the Kona, and Tesla models are 'famed' for their efficiency, especially considering the size and weight of the S & X.

Some of the others like the Jag and Audi ..... not so good.

I'd be disappointed if I get anything lower than 5.5miles/kWh during spring /summer /autumn. I often get over 6 miles /kWh if I'm taking it easy, and even yesterday when I had to make 2 'emergency' 25 mile trips to the hospital to visit my MiL the recorded efficiency was 5.7 - that was 2 people but no luggage. The main thing that reduces the range is rain and the cold during winter. But even then I hope to get 5 miles /kWh. The car is the Hyundai Ioniq.

Dave F

1961Nick

With an annual mileage of 33000 miles the standby losses won't bother me.

As long as I can get 3.4miles/kWh out of a TM3, I will be able to do all the charging on the Octopus off peak tariff.

(4 hour charge @ 7.2kWH x 86% = 24.8kWh)

JKenH

1961Nick wrote: »

With an annual mileage of 33000 miles the standby losses won't bother me.

I can see that but for us with irregular use standby losses would be more significant.

My perception of EVs had always been that they were best as a slightly wacky urban runabout but that has all changed with Tesla and the likes of the IPace which seem ideally suited to the routine of a long daily commute with cheap overnight home charging. Ideal for you Nick.

GreatApe

michaels wrote: »

2015 Leaf showing 4.8 miles per km over the last 2k but that is driven gently iand n summer when consumption Is lower. Also need to subtract 10% approx charging loss

At what percentage of the speed of light were you traveling to manage that?

JKenH

GreatApe wrote: »

At what percentage of the speed of light were you traveling to manage that?

As this is a money saving forum presumably EV drivers who can charge their EV for free from domestic solar will be less bothered about miles/kWh than those paying for grid power. Also new adopters are likely to drive with one eye on the consumption meter just as I watch every kw I use now I have solar panels, although the novelty is wearing off.

If would be interesting to hear the experiences of company car EV users where getting somewhere in a hurry will be the main priority.