On Wed, 25 Jul 2018 08:14:56 -0700 (PDT), harry
wrote:

On Tuesday, 24 July 2018 11:56:59 UTC+1, John Rumm wrote:
On 24/07/2018 06:56, harry wrote:
On Tuesday, 24 July 2018 02:39:05 UTC+1, John Rumm wrote:


Any practical[1] mainstream EV could only be charged to a tiny
fraction of its capacity from 13A overnight.


[1] i.e. not the virtue signalling toy ones like yours.

-- Cheers,

John.

Drivel. As usual you are "expert" on something you have zero
knowledge and experience of.

Its simple arithmetic harry. 13A @ 240V for 8H is ~25kWh - about the
same energy content as that contained in 5L of petrol.

No-one runs their electric car to depletion. Or anywhere near.

You say that like its a good thing!

While its understandable, since the pain of actually running out of
power is considerable, it means even less of the energy stored is
available for use. Less of a problem if you have "loads" in the first
place, but more difficult when you need all the range you can get.

Only supercars have very large batteries.

For some version of "very large".

Once "normal" normal EVs have even larger batteries,


Most have batteries of 40 Kwh or less. Many have less than 20 Kwh.

Indeed - both far too small.

Easily capable of recharging overnight on 13a socket.

The 20kWh one could, the 40kWh one would get to just over half charged
in 8 hours.

Nobody runs their battery to depletion.
Plus there will be charge points at workplaces.

Only the ones with carparks.

Batteries of more than 20Kwh will be rare.



The reason for these special sockets is so that in the future they
can be separately metered and charged for at a much higher rate to
make up for fuel tax losses.

The reason for the special sockets is (for now at least) so that one can
use a more appropriate charge rate.

I can't see separate metering at elevated tax rates being a big selling
point.


It's not a selling point. It's what will happen in the future when electric cars are the norm.
If you can't see this you're not clever.
Just as zero road tax is a temporary inducement.

The motors used on electric cars are around six times as efficient as ICE
Plus energy is recovered by regeneration.
Transport costs/losses for electricity are negligible.
Also electricity can be generated using gas.
Plus they can be recharged for free with home PV power.

The cost of infra-structure is the problem.