On 13/07/2018 15:51, wrote:
On Fri, 13 Jul 2018 11:53:44 +0100
John Williamson wrote:
On 13/07/2018 11:37, wrote:
On Fri, 13 Jul 2018 11:14:39 +0100
John Williamson wrote:
What's important to the grid is the input. Your 6,250 Amps for the
chargers will be split into chunks of about 200 Amps per bus (at about
600 volts, IIRC), by the distribution network. It will come into the
site at about 120 Amps per feed at 11kv.

Is 11KV the standard voltage for distribution within UK cities? I wonder
why they chose that particular value. Just curious...

If you check, there is a whole network of different standard voltages
starting with the 400kV supergrid, right down to the 415 Volt 3 phase
plus neutral feeder that runs under or over your street, with branches
off to give a single phase 230 Volt supply to your house or flat.

240V isn't it or did it get dropped down at some point?


Quite a while ago.

--
Graeme Wall
This account not read.

In message , at 11:53:44 on Fri, 13
Jul 2018, John Williamson remarked:

If you check, there is a whole network of different standard voltages
starting with the 400kV supergrid, right down to the 415 Volt 3 phase
plus neutral feeder that runs under or over your street, with branches
off to give a single phase 230 Volt supply to your house or flat.

In general terms, the current at each stage is similar.

Broadly true, apart from the supergrid being 1000A, as far as I can
tell.

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?
--
Roland Perry

On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use. The street main is usually 200A per phase, though.

--
Tciao for Now!

John.

Most distribution Voltages in the UK are 10% higher than nice round numbers.. 11 and 33 kV are widely used, 66 kV for some large substations. 22 kV is not much used in the UK, more common on the mainland, but the London Underground has quite a bit of it, I think because joints in 33 kV were too large.

6.6 kV is still used, though becomming less common. Quite a lot of Croydon is still fed ay that Voltage.

In message , at 16:21:33 on Fri, 13
Jul 2018, John Williamson remarked:
On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use.

The problem with off-peak is that everyone is expecting to use it, so it
becomes just as much in demand as "peak".

3 kilowatts is double the normal average power consumption of houses.

The street main is usually 200A per phase, though.

Which if we believe grid figures that an average household is perhaps
1.5kW means it can feed (200/(1500/230))x3 = 90 houses.

Still wondering where even the level 2 Tesla chargers (80 amps at 230v)
will get their supply from.
--
Roland Perry

On Fri, 13 Jul 2018 16:41:57 +0100, Roland Perry
wrote:

In message , at 16:21:33 on Fri, 13
Jul 2018, John Williamson remarked:
On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use.

The problem with off-peak is that everyone is expecting to use it, so it
becomes just as much in demand as "peak".

3 kilowatts is double the normal average power consumption of houses.

The street main is usually 200A per phase, though.

Which if we believe grid figures that an average household is perhaps
1.5kW means it can feed (200/(1500/230))x3 = 90 houses.

Still wondering where even the level 2 Tesla chargers (80 amps at 230v)
will get their supply from.

The future is hydrogen.

--
jhk

On 13/07/2018 19:12, Jarle Hammen Knudsen wrote:
On Fri, 13 Jul 2018 16:41:57 +0100, Roland Perry
wrote:

In message , at 16:21:33 on Fri, 13
Jul 2018, John Williamson remarked:
On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use.

The problem with off-peak is that everyone is expecting to use it, so it
becomes just as much in demand as "peak".

3 kilowatts is double the normal average power consumption of houses.

The street main is usually 200A per phase, though.

Which if we believe grid figures that an average household is perhaps
1.5kW means it can feed (200/(1500/230))x3 = 90 houses.

Still wondering where even the level 2 Tesla chargers (80 amps at 230v)
will get their supply from.

The future is hydrogen.


As it has been for 50 years…

--
Graeme Wall
This account not read.

On Fri, 13 Jul 2018 19:22:45 +0100, Graeme Wall
wrote:

On 13/07/2018 19:12, Jarle Hammen Knudsen wrote:
On Fri, 13 Jul 2018 16:41:57 +0100, Roland Perry
wrote:

In message , at 16:21:33 on Fri, 13
Jul 2018, John Williamson remarked:
On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use.

The problem with off-peak is that everyone is expecting to use it, so it
becomes just as much in demand as "peak".

3 kilowatts is double the normal average power consumption of houses.

The street main is usually 200A per phase, though.

Which if we believe grid figures that an average household is perhaps
1.5kW means it can feed (200/(1500/230))x3 = 90 houses.

Still wondering where even the level 2 Tesla chargers (80 amps at 230v)
will get their supply from.

The future is hydrogen.


As it has been for 50 years…

50 years ago, you couldn't drive a hydrogen-powered car from John
O'Groats to Land's End, as Autocar did last month:
https://www.autocar.co.uk/car-news/new-cars/john-o%E2%80%99groats-land%E2%80%99s-end-hydrogen-fuel-cell-car

On 14/07/2018 13:31, Recliner wrote:
On Fri, 13 Jul 2018 19:22:45 +0100, Graeme Wall
wrote:

On 13/07/2018 19:12, Jarle Hammen Knudsen wrote:
On Fri, 13 Jul 2018 16:41:57 +0100, Roland Perry
wrote:

In message , at 16:21:33 on Fri, 13
Jul 2018, John Williamson remarked:
On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use.

The problem with off-peak is that everyone is expecting to use it, so it
becomes just as much in demand as "peak".

3 kilowatts is double the normal average power consumption of houses.

The street main is usually 200A per phase, though.

Which if we believe grid figures that an average household is perhaps
1.5kW means it can feed (200/(1500/230))x3 = 90 houses.

Still wondering where even the level 2 Tesla chargers (80 amps at 230v)
will get their supply from.

The future is hydrogen.


As it has been for 50 years…

50 years ago, you couldn't drive a hydrogen-powered car from John
O'Groats to Land's End, as Autocar did last month:
https://www.autocar.co.uk/car-news/new-cars/john-o%E2%80%99groats-land%E2%80%99s-end-hydrogen-fuel-cell-car


You could have done, though I don't know if anyone ever did. Also
possible in a gas-turbine car and one or two other exotic beasts around
that time.

--
Graeme Wall
This account not read.

Graeme Wall wrote:
On 14/07/2018 13:31, Recliner wrote:
On Fri, 13 Jul 2018 19:22:45 +0100, Graeme Wall
wrote:

On 13/07/2018 19:12, Jarle Hammen Knudsen wrote:
On Fri, 13 Jul 2018 16:41:57 +0100, Roland Perry
wrote:

In message , at 16:21:33 on Fri, 13
Jul 2018, John Williamson remarked:
On 13/07/2018 16:09, Roland Perry wrote:

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?

The grid will eventually have to be upgraded, though for domestic use,
an off peak slow charge at 3 kilowatts is usually enough for a day's
use.

The problem with off-peak is that everyone is expecting to use it, so it
becomes just as much in demand as "peak".

3 kilowatts is double the normal average power consumption of houses.

The street main is usually 200A per phase, though.

Which if we believe grid figures that an average household is perhaps
1.5kW means it can feed (200/(1500/230))x3 = 90 houses.

Still wondering where even the level 2 Tesla chargers (80 amps at 230v)
will get their supply from.

The future is hydrogen.


As it has been for 50 years…

50 years ago, you couldn't drive a hydrogen-powered car from John
O'Groats to Land's End, as Autocar did last month:
https://www.autocar.co.uk/car-news/new-cars/john-o%E2%80%99groats-land%E2%80%99s-end-hydrogen-fuel-cell-car


You could have done, though I don't know if anyone ever did. Also
possible in a gas-turbine car and one or two other exotic beasts around
that time.

No, you couldn't have done it then with a hydrogen-powered car, both
because they didn't exist and fhere weren't any hydrogen filling stations.
As of 2018, there are only just enough filling stations around the country
for a slightly indirect route; next year should be easier, as more hydrogen
filling stations open.