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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 :)
  • Former Community Member
    0 Former Community Member
    It may also make owning a “modern classic” car unrealistic and car buffs will be better off selling cars Dutch as a Porsche and actually buying an older car than qualifies for an exemption.


    I'll rise!


    Yes, I still hanker over a DAF but it would have to be what the young call a sleeper (I have a SD1 V8 engine and manual gearbox looking for a home) and there is no way I'd take my car to Birmingham, even Worcester can be "iffy"..............


    The TR6 is a quite a way off being roadworthy plus, I was a lot thinner and flexible 45 years ago.........


    Regards


    BAD




  • 0
    Of course the engine could be ripped out and the car converted to electric,  at a price.
  • 0
    Sparkingchip:

    Of course the engine could be ripped out and the car converted to electric,  at a price. 


    There is no such think as a new idea - approx 100 years ago, some steam traction engines were being converted to the new diesel it must be said that the results were certainly distinctive, but not giving the best of either technology.  

    I guess an electric car with clutch and gears makes similarly little sense.

    M.


  • 0
    The clutch and gears can be retained, but you don’t need to use them.

     



  • 0
    Anyway, back to the OP ?

    Would it be more acceptable to use the calculation:

    '100% of current demand of the largest circuit + 40% of the current demand of every other circuit' 

    This would bring me out at around 80A, I would rather have some kind of calculation behind my answer rather than the 'make it up to get a bigger cut out' approach!
  • 0
    It seems a perfectly reasonable approach. It is all very arbitrary.

    Mike.
  • 0
    Well whilst there is huffing and puffing about this, as far as I am concerned, Amendment one clarified the maximum demand situation(see 722.311.201). Load curtailment, including load reduction or disconnection, either automatically or manually may be take into account when determining maximum demand of the installation. What installation, the EVSE or the whole installation?  So read that how you will but it could be interpreted  that if you have two showers and a 7Kw EVSE, switch off the two showers and the MD is just 7Kw. Perhaps GK would be in the best position to clarify?

    By the way, my January claim on the EVHS side has not been paid. WCS was fine but I suspect there is extreme pressure on the paper shufflers on the domestic end. I will be doing no more domestic EVSE installs, far too much hassle!
  • 0
    You’re not the only one awaiting payment since January, others have the same issue.
  • 0
    Drifting again. 


    Half a million vehicles that may be shipped out of London to other parts of the country. 

    https://www.autoexpress.co.uk/opinion/355032/londons-ulez-expansion-could-fundamentally-alter-uks-used-car-market
  • 0
    lyledunn:


    By the way, my January claim on the EVHS side has not been paid. WCS was fine but I suspect there is extreme pressure on the paper shufflers on the domestic end. I will be doing no more domestic EVSE installs, far too much hassle! 


    Seriously!

    I take it that you have been claiming before January with no issues? So you have had no grant money since then, how many have you fitted?

    Do you charge the customer and then refund them when the claim comes through or deduct it from the invoice straight away?


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