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Cart before the horse? (EV charging)

AncientMariner

Am looking at replacing our 1999 diesel engined car ideally with an EV.

Would obviously want to charge with a 7 kW unit so the question is would our existing Grey Series 7 II b cutout with an 80A fuse fitted be capable of 7 kW or only 3.6 kW. 

So before I even look at a car, I really need to know.  Emailed SP Energy Systems “Getting Connected” and get the reply, “Please be advised that when your installer submits the notification form for the charger, the property will be surveyed and anything required will be carried out as part of that.”  Ok then, I buy the car and then find out that I can only charge at the 3.6kW rate. I could of course have a charging point fitted first, but then would not be able to claim any subsidy or dealer offer.

Clive

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    I'm some years retired from electricity distribution but there seems to have been little policy progress or recognition of the cost impact of rebuilding distribution systems to handle EVs.

    After Diversity Maximum Demand (ADMD) is the aggregate demand across a group of users (20 - 30 houses+ with an increase for smaller groups) and usually lower than most would guess at 3-4 kW/house. I've not come across distribution companies setting a maximum demand for each consumer beyond the cutout fuse rating.

    In old money 80A is just a bit short of 20kW. Street cabling has a cyclic rating for several hours but service cables in more a matter of minutes especially if run in an insulated wall cavity.

    Not relative to your initial choice of one car how many houses will have a single car to charge and how long to charge a discharged Tesla at 7kW? (or a car, a couple of tractors and an HGV).

    In addition to cable ratings and reinforcement will additional distribution substations have to be dropped into the network with all the politics of siting in a developed area?

    Solutions will need electricity supply policies and costs but also social adjustments, better public or shared transport and some re-distribution of work.

    To go back to the question it's might be best to fit your 7kW unit before the waste hits the, possibly still rotating, fan.

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    I'm some years retired from electricity distribution but there seems to have been little policy progress or recognition of the cost impact of rebuilding distribution systems to handle EVs.

    After Diversity Maximum Demand (ADMD) is the aggregate demand across a group of users (20 - 30 houses+ with an increase for smaller groups) and usually lower than most would guess at 3-4 kW/house. I've not come across distribution companies setting a maximum demand for each consumer beyond the cutout fuse rating.

    In old money 80A is just a bit short of 20kW. Street cabling has a cyclic rating for several hours but service cables in more a matter of minutes especially if run in an insulated wall cavity.

    Not relative to your initial choice of one car how many houses will have a single car to charge and how long to charge a discharged Tesla at 7kW? (or a car, a couple of tractors and an HGV).

    In addition to cable ratings and reinforcement will additional distribution substations have to be dropped into the network with all the politics of siting in a developed area?

    Solutions will need electricity supply policies and costs but also social adjustments, better public or shared transport and some re-distribution of work.

    To go back to the question it's might be best to fit your 7kW unit before the waste hits the, possibly still rotating, fan.

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