This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Maximum Demand / ENA / EV Help!

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 :)
Parents
  • davezawadi (David Stone):

    This may be somewhat controversial but relates directly to the OP, maximum demand.


    It seems to me that the wrong person is being made to pay for the Government plan to switch to all Electric vehicles. The infrastructure simply cannot withstand the addition of domestic EV chargers, being a long-term large load. Load curtailment might work with a small number of Electric vehicles but simply cannot work if everyone has one! There is endless talk about "average load" and similar phrases (in the same way as "Green" generation BTW), but the electricity supply system is not anything to do with average loads, it is entirely dependant on the peak load being less than the supply capability at all times. The vehicle owner may be paying for a Zappi or whatever, which I presume are not cheap or free, but they are not paying the infrastructure cost at all, this will undoubtedly come on all consumers or the taxpayer at some point. This cost should come on the price of Electric cars now, including the huge "Carbon" cost of the infrastructure improvements and building much more nuclear generation very quickly ie. less than 10 years. A tax of 500% of the cost does not seem unreasonable, the estimated cost of going all-electric is currently £3 Trillion and rising every day that passes. Politics is as usual totally oblivious of economics, even if we rebuild everything it is doubtful if enough raw materials can be obtained, particularly copper and aluminium, remembering that aluminium refining needs immense amounts of electricity!


    If we all have to have heat pumps, which work in winter at -10C then the average consumer will be bankrupt, air exchange heat pumps have a COP of about 2 with -10 in and 50C out. The alternative will be the replacement of all heating in houses with full air conditioning, a pretty much impossible task. Is engineering impossibility and cost beyond the realm of Government? It seems that it is. Heat pumps everywhere will need another 100GW of power and distribution, ie 40 - 50 new nuclear plants (and that is only 2kW per domestic property!).


    Of course, I realise that electricity comes from political hot air, so there must be an infinite supply available! Maximum demand will go through the roof from these changes, this OP is trivial by comparison.


    Indeed!

    One wonders when the penny will drop.

    All this green agenda is wrongly pushed by 'climate alarmists' 

    Pollution I get but CO2 i most certainly don't


Reply
  • davezawadi (David Stone):

    This may be somewhat controversial but relates directly to the OP, maximum demand.


    It seems to me that the wrong person is being made to pay for the Government plan to switch to all Electric vehicles. The infrastructure simply cannot withstand the addition of domestic EV chargers, being a long-term large load. Load curtailment might work with a small number of Electric vehicles but simply cannot work if everyone has one! There is endless talk about "average load" and similar phrases (in the same way as "Green" generation BTW), but the electricity supply system is not anything to do with average loads, it is entirely dependant on the peak load being less than the supply capability at all times. The vehicle owner may be paying for a Zappi or whatever, which I presume are not cheap or free, but they are not paying the infrastructure cost at all, this will undoubtedly come on all consumers or the taxpayer at some point. This cost should come on the price of Electric cars now, including the huge "Carbon" cost of the infrastructure improvements and building much more nuclear generation very quickly ie. less than 10 years. A tax of 500% of the cost does not seem unreasonable, the estimated cost of going all-electric is currently £3 Trillion and rising every day that passes. Politics is as usual totally oblivious of economics, even if we rebuild everything it is doubtful if enough raw materials can be obtained, particularly copper and aluminium, remembering that aluminium refining needs immense amounts of electricity!


    If we all have to have heat pumps, which work in winter at -10C then the average consumer will be bankrupt, air exchange heat pumps have a COP of about 2 with -10 in and 50C out. The alternative will be the replacement of all heating in houses with full air conditioning, a pretty much impossible task. Is engineering impossibility and cost beyond the realm of Government? It seems that it is. Heat pumps everywhere will need another 100GW of power and distribution, ie 40 - 50 new nuclear plants (and that is only 2kW per domestic property!).


    Of course, I realise that electricity comes from political hot air, so there must be an infinite supply available! Maximum demand will go through the roof from these changes, this OP is trivial by comparison.


    Indeed!

    One wonders when the penny will drop.

    All this green agenda is wrongly pushed by 'climate alarmists' 

    Pollution I get but CO2 i most certainly don't


Children
No Data