Sparkingchip:

As far as I know every house in the road where I live  has a looped supply, except one house as when it the houses were being built that single house had a three phase supply installed because the guy buying the house was planning to have a big lathe in his garage. Fifty odd years later that guy has died, but his widow is living in the only house in the road that can have an EV charger installed without having to have a service cable upgrade.


If half the houses need a service cable upgrade, installing a three phase supply to these homes is presumably perfectly feasible. 

Sensible chap!


With a looped supply, if you want an upgrade, doesn't your neighbour also need an upgrade as well? And your neighbour's neighbour? And so on?

davezawadi (David Stone):

Is a payback period of 6700 hours, worthwhile? In most installs, it is unlikely the car will use 7000 kWh/ year, thus the payback period would probably outlive the car. This is the trouble with just looking at the energy loss, and what is wrong with the BS HD 60364-8 specs, their only idea is to reduce overall consumption at whatever cost. A proper cost/benefit analysis  (although mentioned) is often a finger in the air exercise, it is the same with electric motors and VFDs, the tradeoff is never that clear cut unless it is a 24/7 operation. 

The point made is a good one although the cost/benefit analysis that I am thinking about is not necessarily a monetary one. Looking at the data for the car and assuming either 6mm2 or 10mm2 is to be installed, I calculate that wastage per 1000miles is around 11KWhrs for the 6mm2 and 6.8KWhrs for the10mm2. Now depending on the cost of electricity and the number of miles per year, I can make a reasonable estimate on monetary pay back. As you say David, it could be quite some time! However, what I can’t accurately say is if the wasted energy is worth saving in terms of CO emissions and how this whole consideration can be scaled to a national level.