New Granturismo

[Felonious Crud]

Remember that EVs chug through power when at a static speed on a motorway because they regenerate nothing. So that 250 range might well be hopelessly optimistic. Which is a bit pointless for a GT.

 

[safrane]

Range was achieved on his test, but it was in eco mode... which kind of kills the reason for all that performance.

 

[Felonious Crud]

Range was achieved on his test, but it was in eco mode... which kind of kills the reason for all that performance.

Thanks, Peter, I'll watch that a bit later.

Was the test on a motorway at a static speed?

 

[Zep]

Thanks, Peter, I'll watch that a bit later.

Was the test on a motorway at a static speed?

Interestingly my hybrid will do its pretty much its full range in electric at 70 mph. It’s the acceleration that eats the electrons.

 

[Felonious Crud]

Interestingly my hybrid will do its pretty much its full range in electric at 70 mph. It’s the acceleration that eats the electrons.

What's the range, Zep; 50 miles or so, or further?

 

[safrane]

Thanks, Peter, I'll watch that a bit later.

Was the test on a motorway at a static speed?

Test in this case was in eco mode in the M.way... thats why I was surprised that c£13.00 only gave 84 miles extra... my old diesel did c57miles per gallon or 8 quid.

 

[Zep]

What's the range, Zep; 50 miles or so, or further?

The book says 36 miles on a charge. In practice it will do that in warm weather without a lot of acceleration events. Over the course of a hybrid motorway journey of say 120 miles, about 50 will be electric depending on traffic and the off motorway runs at either end.

 

[gb-gta]

Test in this case was in eco mode in the M.way... thats why I was surprised that c£13.00 only gave 84 miles extra... my old diesel did c57miles per gallon or 8 quid.

I noticed that, £13 for 84 miles of charge.
Out and about charging already more expensive than a 40 ish mpg ICE car……
I guess it’s much cheaper at home but it’s not a good sign.

 

[Zep]

I noticed that, £13 for 84 miles of charge.
Out and about charging already more expensive than a 40 ish mpg ICE car……
I guess it’s much cheaper at home but it’s not a good sign.

Yes, adhoc charging can be very expensive. If you are a member of schemes like charge master or pod point, it can be free or about the same as at home (circa 14p per kWh). If you have an EV charge plan at home it can be as little as 5p per kWh, so about 1.4p per mile.

 

[CatmanV2]

Yes, adhoc charging can be very expensive. If you are a member of schemes like charge master or pod point, it can be free or about the same as at home (circa 14p per kWh). If you have an EV charge plan at home it can be as little as 5p per kWh, so about 1.4p per mile.

Question: Why do we not measure electricity usage in Joules?

C

 

[Tallman]

You must also factor in change. Fossil fuels will inevitably get (much) more expensive and with greater adoption, charging will become cheaper. There is no point in doing a straight comparison under current circumstance.

 

[conaero]

A dealer I spoke to recently is still expecting three forms of the car - 100% electric / hybrid / some form of ice (most likely a version of mc20’s v6) but didn’t have / couldn’t share any other details

Agree

I think Maserati are just doing some market research to see how upset we would be with pure electric:

VERY!

 

[huesey1974]

Far from convinced about all electric cars, not sure how they work regarding heating etc. I always think about how it would have been with all electric a few years back when we were hit with a huge snowstorm. I ended up stuck on a motorway with a few hundred other cars as some HGV’s were unable to climb a section. I was there for 14 hours, it was -7 overnight. Was nice and warm in my petrol car. Cant imagine the carnage if all electric, freeze to death? Cars all out of power? Moving hundreds of flat cars might have been a challenge once the HGV’s moved.

 

[safrane]

Love the pre heat in my XC90... works off petrol and can be used before you set off via a timer and app. Also when stopped rather than running the engine.

And lecky for round town, perfect.

 

[CatmanV2]

Far from convinced about all electric cars, not sure how they work regarding heating etc. I always think about how it would have been with all electric a few years back when we were hit with a huge snowstorm. I ended up stuck on a motorway with a few hundred other cars as some HGV’s were unable to climb a section. I was there for 14 hours, it was -7 overnight. Was nice and warm in my petrol car. Cant imagine the carnage if all electric, freeze to death? Cars all out of power? Moving hundreds of flat cars might have been a challenge once the HGV’s moved.

Indeed. Bit of an edge case though, and you could still run out of petrol. I wonder how long a petrol car can run its heater for on (for example) 1/2 tank vs an electric car on half charge. At a guess the electric will provide instant heat but if you let the petrol cool down, you've got to get it all back up to temp <shrug>

C

 

[Zep]

Far from convinced about all electric cars, not sure how they work regarding heating etc. I always think about how it would have been with all electric a few years back when we were hit with a huge snowstorm. I ended up stuck on a motorway with a few hundred other cars as some HGV’s were unable to climb a section. I was there for 14 hours, it was -7 overnight. Was nice and warm in my petrol car. Cant imagine the carnage if all electric, freeze to death? Cars all out of power? Moving hundreds of flat cars might have been a challenge once the HGV’s moved.

An interesting question, so I did some maths.

A litre of petrol contains 9.1 kWh of energy. A petrol car burns about 1/2 a litre of petrol and hour when at idle. Petrol engines are around 35% efficient so that means that, assuming about a third of the waste energy goes to heating the cabin, around 2 kWh of energy is available to heat the cabin and if you had half a tank, say 30 litres of fuel onboard, you could last 60 hours. After 14 hours, you would still have enough fuel for 170 miles of driving, if you had the energy yourself.

For an electric car with a capacity of 82 kWh, half full, that would be around 41 kWh. Modern EVs use heat pump systems (most of them do anyway, and in the future all will) for cooling and heating, so to generate the same 2 kWh of heating would take approx 0.7 kWh in battery energy. So after 14 hours, you would have 31 kWh of battery left, or enough for 83 miles.

These numbers are quite extreme, but the electric car isn’t stranded, however it is certainly less resilient than a petrol car with current (geddit) technology. With 1/4 of a tank / battery both vehicles would probably be stranded. It will be interesting to see what the answer is in 5 years time.

 

[huesey1974]

Zep, im impressed!!! Not 100% sure but I believe i had half a tank and still had a good bit when we got moving. Had no idea about how much power the electric would use so good to know if the wife ever gets one. As Catman says it’s unusual for that to happen but good to know.

 

[CatmanV2]

An interesting question, so I did some maths.

A litre of petrol contains 9.1 kWh of energy. A petrol car burns about 1/2 a litre of petrol and hour when at idle. Petrol engines are around 35% efficient so that means that, assuming about a third of the waste energy goes to heating the cabin, around 2 kWh of energy is available to heat the cabin and if you had half a tank, say 30 litres of fuel onboard, you could last 60 hours. After 14 hours, you would still have enough fuel for 170 miles of driving, if you had the energy yourself.

For an electric car with a capacity of 82 kWh, half full, that would be around 41 kWh. Modern EVs use heat pump systems (most of them do anyway, and in the future all will) for cooling and heating, so to generate the same 2 kWh of heating would take approx 0.7 kWh in battery energy. So after 14 hours, you would have 31 kWh of battery left, or enough for 83 miles.

These numbers are quite extreme, but the electric car isn’t stranded, however it is certainly less resilient than a petrol car with current (geddit) technology. With 1/4 of a tank / battery both vehicles would probably be stranded. It will be interesting to see what the answer is in 5 years time.

Thanks for that!

C

 

[Zep]

Question: Why do we not measure electricity usage in Joules?

C

A good question, as a kilowatt-hour can be directly converted into joules (not the expensive jumpers), and is 3600 kilojoules (As a kilowatt is a kilojoule per second and there are 3600 seconds in an hour.

I think this dates back to when electricity meters were being invented, when there were lots of other mental units of measurement around (British thermal units anyone?) and is also because it is easier for Joe public to wrap their heads around.

What I will say is that when we are looking at industrial / commercial stuff, nobody uses kWh, except for their electric bills and generation.

 

[spkennyuk]

An interesting question, so I did some maths.

A litre of petrol contains 9.1 kWh of energy. A petrol car burns about 1/2 a litre of petrol and hour when at idle. Petrol engines are around 35% efficient so that means that, assuming about a third of the waste energy goes to heating the cabin, around 2 kWh of energy is available to heat the cabin and if you had half a tank, say 30 litres of fuel onboard, you could last 60 hours. After 14 hours, you would still have enough fuel for 170 miles of driving, if you had the energy yourself.

For an electric car with a capacity of 82 kWh, half full, that would be around 41 kWh. Modern EVs use heat pump systems (most of them do anyway, and in the future all will) for cooling and heating, so to generate the same 2 kWh of heating would take approx 0.7 kWh in battery energy. So after 14 hours, you would have 31 kWh of battery left, or enough for 83 miles.

These numbers are quite extreme, but the electric car isn’t stranded, however it is certainly less resilient than a petrol car with current (geddit) technology. With 1/4 of a tank / battery both vehicles would probably be stranded. It will be interesting to see what the answer is in 5 years time.

Electric vehicles should come with a hand crank generator for just such situations. It would take a while to put enough charge in the batteries but at least the exercise would keep you warm at minus 7.

Plus it would be funny seeing somebody attempting to wind up their electric vehicle. A nostalgic nod to the starter crank handles of old.