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Maximum Demand / ENA / EV Help!

D4G
Hello all,


This evenings issue relates to an EV charger install.

The supply cut out is labelled 60/80 amp so I called the DNO and asked if this could be uprated to 100 amp.

They have sent me the ENA EV application form which asks for the Maximum Demand including the new equipment.

The problem I have is the existing circuits are:


32A - 7.2 kW shower 

40A - 8.2 kW shower

32A - Ring main

32A - 7.9 kw cooker

6A - lighting

6A - lighting

6A - security


Additional 32A for EV charger


So even with diversity I'm way over 100A, obviously in reality the diversity calculations are not appropriate as the client has never blown the cut out.

The smaller shower is not currently in use although they want to replace it for another one, I have told them this may not be possible.

The EV charger will have load management but I still need to put a figure on the ENA form....


Help appriciated :)
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    mapj1:

    It will not be the DNO ADMD - that is pretty much the one that matches the leccy bill and is the 1 to 2kw or whatever that the load averages out to smoothed over a few days.


    Yes, but SSE allowed me up to 30 kVA ADMD "for the entire development". Perhaps they thought that I was going to build a few houses instead of a garage extension. ?


    Or perhaps a garage extension is presumed to have an EVCP, which seems to gobble up more leccy than everything else put together.


    In this document ADMD is explained at section 3 (page 5 onwards) and MD is explained on page 8.


    I must say that those annual consumption figures could be a bit eye-watering. 1000 x EVCP rating in kW. If you have only a 7 kW single phase one, that would be 7000 kWh per year with an assumed mileage @ 4 miles to the kWh of 28000 miles. And if you have a Tesla-style 3-phase EVCP, how could you possibly manage 84000 miles in a year? That's 230 miles per day, every day, with no topping up elsewhere! ?


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  • 0
    mapj1:

    It will not be the DNO ADMD - that is pretty much the one that matches the leccy bill and is the 1 to 2kw or whatever that the load averages out to smoothed over a few days.


    Yes, but SSE allowed me up to 30 kVA ADMD "for the entire development". Perhaps they thought that I was going to build a few houses instead of a garage extension. ?


    Or perhaps a garage extension is presumed to have an EVCP, which seems to gobble up more leccy than everything else put together.


    In this document ADMD is explained at section 3 (page 5 onwards) and MD is explained on page 8.


    I must say that those annual consumption figures could be a bit eye-watering. 1000 x EVCP rating in kW. If you have only a 7 kW single phase one, that would be 7000 kWh per year with an assumed mileage @ 4 miles to the kWh of 28000 miles. And if you have a Tesla-style 3-phase EVCP, how could you possibly manage 84000 miles in a year? That's 230 miles per day, every day, with no topping up elsewhere! ?


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