Maximum Demand / ENA / EV Help!

Sparkingchip:

There’s also an IET webinar available chaired by John Peckham with Mark Coles, Head of Technical Regulations at the IET and Graham Kenyon, Managing Director of G Kenyon Technology Ltd.

https://electrical.theiet.org/bs-7671/faqs/webinar-questions-and-answers/electrical-diversity-and-load-curtailment-evc-webinar/

Thanks for that link, a lot of questions re diversity. 

The answer for the maximum demand question would be data logging however due to seasonal changes not really possible.

The reality is it is a educated estimate, which will become more accurate with experience!


Being as the EV charger has load curtailment I will be adding demand however not excessive.  Also I intend to disconnect the unused shower so removing a 32A circuit and adding a 32A circuit.

Kelly Marie Angel:

Whats an ENA please 

Energy Networks Association, the UK body for gas and electricity transmission.

 

lyledunn:

The maximum demand situation is an absolute mess at the moment. I adopt the view taken by Jon Steward. My nett increase is zero as I only use EVSE with load curtailment.  I make my assessment of each situation based on the ENA cut out guidance and whether there are any combustible items stored within the immediate area. If I feel a safe install can proceed, I install and notify the DNO afterwards. I make it abundantly clear to the customer that the DNO may require upgrade not because of the additional EVSE but because their MD was theoretically already in excess of the supply capacity. 

I have been asked on occasion by the DNO (NIE) to advise if the load curtailment is fail safe, ie. that the charge current will be switched off in the event of any failure of the load monitoring circuit. I use the Myenergi Zappi for domestic installs so I simply sent the DNO their answer to that. I have had no response and that was at least 6months ago.

We all must make sure our installations are safe but the burden of supply capacity has to be borne by the DNOs who can in turn deal directly with any agitation from their customers!


 

The 60A load limit as to whether the DNO is informened before or after is a nuisance, surely the majority of houses have a MD of more than 28A (32A to be added for the EVSE)??

I will be pushing the Zappi as my prefered unit due to all the safety features being included although more maufacturers are going this way now.

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

Jon Steward:

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

What about the London ULEZ extension?


Some years ago I lived near to Hangar Lane Gyratory: about 100 yards inside the N. Circular. £12.50 a day would not have been funny.


And what are tradesmen going to do? Sorry, luv, that'll be £12.50 extra for the ULEZ. ?