On 14/07/2018 20:26, Recliner wrote:
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.


No filling stations certainly, but the odd experimental vehicle.



--
Graeme Wall
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