There seems to be a standard installation developing for domestic EV charge points where it is 6mm2 no matter what. I checked one installation which will have around 9v dropped on a 7Kw charger. Ok, I acknowledge that the full load current won’t be pulled at all times but it can be assumed that there will be long periods when it will. Multiply that by an ever increasing demand across the nation and we can expect to see considerable energy wastage. Perhaps, we should be setting tighter limits than 5%.
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. Changing every property to 3 phase (unless required by foolish ideas on changing everything to electric) would cost a huge amount of money, say £1000 per property x 30 million = 30 billion pounds to save a tiny amount of electricity in the bigger picture. Stupid!
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. Changing every property to 3 phase (unless required by foolish ideas on changing everything to electric) would cost a huge amount of money, say £1000 per property x 30 million = 30 billion pounds to save a tiny amount of electricity in the bigger picture. Stupid!
