On Mon, 16 Jul 2018 12:29:16 +0100, Roland Perry wrote:

In message , at 12:08:38
on Mon, 16 Jul 2018, David Cantrell remarked:

What's important for the EV-charging scenario is that is if several
dozen houses are supplied by an 200A street main at 230v from the local
substation, how can more than a handful charge an EV overnight at 50
amps?

They won't all need to fully recharge a car every night.

Of the many cars parked on a street, plenty of them just aren't used
most days. And of those that are used on any given day, plenty aren't
used much - just a trip to the shops, or the school run, or to a nearby
employer.

This depends a lot on the local demographic. There are plenty of estates
where at least one breadwinner per household is likely to drive to work
(and the national average commute is 67% by car, 30mins).

Where I live that's dominated by the 35 mile round trip to Cambridge,
unless they take the fastest route which is 50 miles round trip.

So with a 35 mile round trip, maybe averaging 35mph, that's one hour per day, or
five hours usage a week, add on another hours usage for bit for shopping etc and
a day off on sunday and that leaves some 162 hours a week for a charge to take
place. 210 miles in a week is just under 11000 miles a year which is high by
average private motorist standards (see below)

At 18kWh/100 miles for a Nissan Leaf (BMW i3 is similar as is the claimed
performance for the Tesla Model 3) then it needs some 1980kWh per annum of
charge.

If 100% of that charge takes place at home then it can take place spread across
100 hours a week (12 hours a day weekdays + 24 hours sunday + 16 hours on a
saturday)

It needs 38 kWh per week to do those 210 miles

Ignoring charging losses that equates to an average mains supply load when on
charge of around 380W, or 1.6A at 240v

As it is the average UK private mileage is (was) 7900 miles in 2013, down from
9200 miles in 2002

https://www.bbc.co.uk/news/uk-england-28546589

So for the 'average private motorist' the average mains supply load when on
charge, for charging purely at home, drops to around 270W or 1.125A at 240v

--

On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric cars
has been kicked into the long grass. As usual politicians will only react when
they have to when the load on the grid either local or national becomes critical
whereupon headless chicken mode will be engaged.

We've already been here before and there is NO problem.

The additonal supply requirements are negligible if you take your head out of
the sand, forget this idea of a two minute charge because thats how long it
takes for your hydrocarbon car to refuel to do 600 miles to the back end of
nowhere without stopping for urinating or whatever and realise the average car
is, with absolute certainty, sat doing absolutely nothing but depreciating for
many thousands of hours a year. Around half of that almost certainly at home.

Even if you commute for an hour a day to some rat infested city It's still sat
at home for maybe 100 hours a week.

Maybe you'll throw in the argument about cables draped across pavements but a
couple of hours of work on the legislation would see that dangerous and
unsociable practive outlawed overnight.

The 'poor' without places to park offroad will have to do without personal
transport charged at home somewhere around 2050-2060 They better get planning
now because there are only 22 years to change habits if they are to buy a new
hydrocarbon fuelled car. Maybe they could start saving now to buy a bigger
property or in the intervening period public transport could fill the gap and
get the vast majority of cars off the road regardless of their fuelling.

See this for a worked example on electricity usage for the 'average UK motorist'

Message-ID:
--

On 17/07/2018 11:50, The Other Mike wrote:
On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric cars
has been kicked into the long grass. As usual politicians will only react when
they have to when the load on the grid either local or national becomes critical
whereupon headless chicken mode will be engaged.

Maybe you'll throw in the argument about cables draped across pavements but a
couple of hours of work on the legislation would see that dangerous and
unsociable practive outlawed overnight.

So outlawing electric cars for something approaching 50% of the
population who can only afford a flat or terraced house.

The 'poor' without places to park offroad will have to do without personal
transport charged at home somewhere around 2050-2060 They better get planning
now because there are only 22 years to change habits if they are to buy a new
hydrocarbon fuelled car. Maybe they could start saving now to buy a bigger
property or in the intervening period public transport could fill the gap and
get the vast majority of cars off the road regardless of their fuelling.

Oh, boy. "Start saving now to buy a bigger property". I'd love to, would
you like to persuade my boss to double my wages in real terms?

As for public transport picking up the load, I live in the best place I
can afford, and while until the firm moved recently it took ten minutes
to drive to work, doing the same trip by public transport took at least
40 minutes with two longish walks and an average ten minute waitfor a
bus halfway, or a short walk, and a direct bus that takes 58 minutes.
Now they've moved, it still takes ten minutes to drive, but well over an
hour to get there by public transport. Now consider, I often work a 14
hour day, and consider I need at least 8 hours at home every night for
sleep and personal hygiene...

See this for a worked example on electricity usage for the 'average UK motorist'

Link? All I see is a message ID.
--
Tciao for Now!

John.

On Tue, 17 Jul 2018 11:50:18 +0100
The Other Mike wrote:
On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric cars
has been kicked into the long grass. As usual politicians will only react
when
they have to when the load on the grid either local or national becomes
critical
whereupon headless chicken mode will be engaged.

We've already been here before and there is NO problem.

The additonal supply requirements are negligible if you take your head out of
the sand, forget this idea of a two minute charge because thats how long it
takes for your hydrocarbon car to refuel to do 600 miles to the back end of
nowhere without stopping for urinating or whatever and realise the average car
is, with absolute certainty, sat doing absolutely nothing but depreciating for
many thousands of hours a year. Around half of that almost certainly at home.

So what? Its the energy that it uses when it is moving thats the issue.

When I last commuted to work by car it was a round trip of about 40 miles, say
2 gallons of diesel which is approx 300 million joules of energy. Assuming
for ease of calculation my car is around 33% efficient that'll be 100M joules
used for moving. Electric cars are (according to google) around 50-60%
efficient from grid to wheel so say an electric car needed 200M to do the
same job. With a 30 amp supply that'll take 200,000,000 / (240 * 30) = 27777
seconds = 7.7 hours to charge.

Now I don't know about you, but I suspect an extra 240 * 30 = 7.2KW load
multiplied by however many houses have electric cars multiplied by 7 hours
will be quite a bit extra for the local substation to cope with.

On Tue, 17 Jul 2018 12:25:25 +0100, John Williamson
wrote:

On 17/07/2018 11:50, The Other Mike wrote:
On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric cars
has been kicked into the long grass. As usual politicians will only react when
they have to when the load on the grid either local or national becomes critical
whereupon headless chicken mode will be engaged.

Maybe you'll throw in the argument about cables draped across pavements but a
couple of hours of work on the legislation would see that dangerous and
unsociable practive outlawed overnight.

So outlawing electric cars for something approaching 50% of the
population who can only afford a flat or terraced house.

The 'poor' without places to park offroad will have to do without personal
transport charged at home somewhere around 2050-2060 They better get planning
now because there are only 22 years to change habits if they are to buy a new
hydrocarbon fuelled car. Maybe they could start saving now to buy a bigger
property or in the intervening period public transport could fill the gap and
get the vast majority of cars off the road regardless of their fuelling.

Oh, boy. "Start saving now to buy a bigger property". I'd love to, would
you like to persuade my boss to double my wages in real terms?

As for public transport picking up the load, I live in the best place I
can afford, and while until the firm moved recently it took ten minutes
to drive to work, doing the same trip by public transport took at least
40 minutes with two longish walks and an average ten minute waitfor a
bus halfway, or a short walk, and a direct bus that takes 58 minutes.
Now they've moved, it still takes ten minutes to drive, but well over an
hour to get there by public transport. Now consider, I often work a 14
hour day, and consider I need at least 8 hours at home every night for
sleep and personal hygiene...

See this for a worked example on electricity usage for the 'average UK motorist'

Link? All I see is a message ID.

Yes it's message id, to another posting here

It's usable by most newsreader for decades, failing that

==
So with a 35 mile round trip, maybe averaging 35mph, that's one hour per day, or
five hours usage a week, add on another hours usage for bit for shopping etc and
a day off on sunday and that leaves some 162 hours a week for a charge to take
place. 210 miles in a week is just under 11000 miles a year which is high by
average private motorist standards (see below)

At 18kWh/100 miles for a Nissan Leaf (BMW i3 is similar as is the claimed
performance for the Tesla Model 3) then it needs some 1980kWh per annum of
charge.

If 100% of that charge takes place at home then it can take place spread across
100 hours a week (12 hours a day weekdays + 24 hours sunday + 16 hours on a
saturday)

It needs 38 kWh per week to do those 210 miles

Ignoring charging losses that equates to an average mains supply load when on
charge of around 380W, or 1.6A at 240v

As it is the average UK private mileage is (was) 7900 miles in 2013, down from
9200 miles in 2002

https://www.bbc.co.uk/news/uk-england-28546589

So for the 'average private motorist' the average mains supply load when on
charge, for charging purely at home, drops to around 270W or 1.125A at 240v
==
--

In message , at 11:46:47 on Tue, 17 Jul
2018, remarked:
Now I don't know about you, but I suspect an extra 240 * 30 = 7.2KW load
multiplied by however many houses have electric cars multiplied by 7 hours
will be quite a bit extra for the local substation to cope with.

The figure to keep bearing in mind is that much of the country's
electricity supply to housing is sized at 1.5KW average consumption.

No-one can just throw several extra KW into the demand and expect it to
cope.
--
Roland Perry

On Tue, 17 Jul 2018 12:25:25 +0100, John Williamson
wrote:

On 17/07/2018 11:50, The Other Mike wrote:
On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric cars
has been kicked into the long grass. As usual politicians will only react when
they have to when the load on the grid either local or national becomes critical
whereupon headless chicken mode will be engaged.

Maybe you'll throw in the argument about cables draped across pavements but a
couple of hours of work on the legislation would see that dangerous and
unsociable practive outlawed overnight.

So outlawing electric cars for something approaching 50% of the
population who can only afford a flat or terraced house.

No, of course not.

There will be plenty of other places to recharge, whether in car
parks, roadside chargers, motorway services, fast charger stations,
etc. As the number of EVs increases, there will be a growing network
of chargers. Even the major oil companies see it as an attractive
market:

https://www.theguardian.com/business/2018/jun/28/bp-buys-uks-biggest-electric-car-charger-network-for-130m

https://uk.reuters.com/article/uk-newmotion-m-a-shell/shell-buys-newmotion-charging-network-in-first-electric-vehicle-deal-idUKKBN1CH1R5

Consortia of car companies are doing the same:

https://electrek.co/2017/11/03/ultra-fast-electric-car-charging-network-unveiled-by-bmw-mercedes-ford-volkswagen/

On Tue, 17 Jul 2018 11:46:47 +0000 (UTC), wrote:

On Tue, 17 Jul 2018 11:50:18 +0100
The Other Mike wrote:
On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric cars
has been kicked into the long grass. As usual politicians will only react
when
they have to when the load on the grid either local or national becomes
critical
whereupon headless chicken mode will be engaged.

We've already been here before and there is NO problem.

The additonal supply requirements are negligible if you take your head out of
the sand, forget this idea of a two minute charge because thats how long it
takes for your hydrocarbon car to refuel to do 600 miles to the back end of
nowhere without stopping for urinating or whatever and realise the average car
is, with absolute certainty, sat doing absolutely nothing but depreciating for
many thousands of hours a year. Around half of that almost certainly at home.

So what? Its the energy that it uses when it is moving thats the issue.

Really?


When I last commuted to work by car it was a round trip of about 40 miles, say
2 gallons of diesel which is approx 300 million joules of energy.

20mpg from a diesel 'car'? I could nearly get that from a UNIMOG

Assuming
for ease of calculation my car is around 33% efficient that'll be 100M joules
used for moving. Electric cars are (according to google) around 50-60%
efficient from grid to wheel so say an electric car needed 200M to do the
same job. With a 30 amp supply that'll take 200,000,000 / (240 * 30) = 27777
seconds = 7.7 hours to charge.

Now I don't know about you, but I suspect an extra 240 * 30 = 7.2KW load
multiplied by however many houses have electric cars multiplied by 7 hours
will be quite a bit extra for the local substation to cope with.

How about using real world kWh/distance travelled published for all commercially
available electric cars rather than 'guessing'?

Plus get this idea out of your head that everyone today drives around with a
near full tank of hydrocarbon fuel and/or they all need to do x hundred miles a
day and they need to emulate anything even remotely resembling your declared
'charging' regime

27kWh spread across 100 hours per week 'at home', or just 270W when on charge is
enough to power most of todays electric cars (Nissan Leaf, BMW i3 etc) for the
mileage of the average motorist. 1.4MWh per average private vehicle per annum,
or aroumd 28TWh for 20 million vehicles on a total current annual supply of
around 330TWh. 28 TWh is only very slightly more than the expected annual
output of Hinkley Point C.


This is from my other posting today in reply to Roland Perry

==
So with a 35 mile round trip, maybe averaging 35mph, that's one hour per day, or
five hours usage a week, add on another hours usage for bit for shopping etc and
a day off on sunday and that leaves some 162 hours a week for a charge to take
place. 210 miles in a week is just under 11000 miles a year which is high by
average private motorist standards (see below)

At 18kWh/100 miles for a Nissan Leaf (BMW i3 is similar as is the claimed
performance for the Tesla Model 3) then it needs some 1980kWh per annum of
charge.

If 100% of that charge takes place at home then it can take place spread across
100 hours a week (12 hours a day weekdays + 24 hours sunday + 16 hours on a
saturday)

It needs 38 kWh per week to do those 210 miles

Ignoring charging losses that equates to an average mains supply load when on
charge of around 380W, or 1.6A at 240v

As it is the average UK private mileage is (was) 7900 miles in 2013, down from
9200 miles in 2002

https://www.bbc.co.uk/news/uk-england-28546589

So for the 'average private motorist' the average mains supply load when on
charge, for charging purely at home, drops to around 270W or 1.125A at 240v
==

--

In message , at 11:41:13 on
Tue, 17 Jul 2018, The Other Mike
remarked:

What's important for the EV-charging scenario is that is if several
dozen houses are supplied by an 200A street main at 230v from the local
substation, how can more than a handful charge an EV overnight at 50
amps?

They won't all need to fully recharge a car every night.

Of the many cars parked on a street, plenty of them just aren't used
most days. And of those that are used on any given day, plenty aren't
used much - just a trip to the shops, or the school run, or to a nearby
employer.

This depends a lot on the local demographic. There are plenty of estates
where at least one breadwinner per household is likely to drive to work
(and the national average commute is 67% by car, 30mins).

Where I live that's dominated by the 35 mile round trip to Cambridge,
unless they take the fastest route which is 50 miles round trip.

So with a 35 mile round trip, maybe averaging 35mph, that's one hour
per day, or five hours usage a week, add on another hours usage for bit
for shopping etc and a day off on sunday and that leaves some 162 hours
a week for a charge to take place.

The commuter will typically be at home for 14hrs a working day, that's
98hrs. What they do at weekends is very much a lifestyle issue, but they
could never clock up another 64hrs indoors.

210 miles in a week is just under 11000 miles a year which is high by
average private motorist standards (see below)

Average motorists include those who aren't commuters.

At 18kWh/100 miles for a Nissan Leaf (BMW i3 is similar as is the claimed
performance for the Tesla Model 3) then it needs some 1980kWh per annum of
charge.

If 100% of that charge takes place at home then it can take place spread across
100 hours a week (12 hours a day weekdays + 24 hours sunday + 16 hours on a
saturday)

It needs 38 kWh per week to do those 210 miles

Ignoring charging losses that equates to an average mains supply load when on
charge of around 380W, or 1.6A at 240v

As it is the average UK private mileage is (was) 7900 miles in 2013, down from
9200 miles in 2002

https://www.bbc.co.uk/news/uk-england-28546589

So for the 'average private motorist' the average mains supply load when on
charge, for charging purely at home, drops to around 270W or 1.125A at 240v

You need to read the National Grid papers on the subject, which suggest
that even with reasonable remediation measures the whole thing falls
over at about 20% EV penetration by 2030.
--
Roland Perry

On Tue, 17 Jul 2018 13:33:55 +0100
Recliner wrote:
On Tue, 17 Jul 2018 12:25:25 +0100, John Williamson
wrote:

On 17/07/2018 11:50, The Other Mike wrote:
On Mon, 16 Jul 2018 08:59:01 +0000 (UTC), wrote:

It seems to me the whole charging problem of mass ownership of electric
cars
has been kicked into the long grass. As usual politicians will only react
when
they have to when the load on the grid either local or national becomes
critical
whereupon headless chicken mode will be engaged.

Maybe you'll throw in the argument about cables draped across pavements but
a
couple of hours of work on the legislation would see that dangerous and
unsociable practive outlawed overnight.

So outlawing electric cars for something approaching 50% of the
population who can only afford a flat or terraced house.

No, of course not.

There will be plenty of other places to recharge, whether in car
parks, roadside chargers, motorway services, fast charger stations,
etc. As the number of EVs increases, there will be a growing network
of chargers. Even the major oil companies see it as an attractive
market:

They'll still take far longer to recharge than an ICE vehicle. Therein lies
the problem.