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Electrical Vehicle Chargers - No Diversity?

Apostolos

Good afternoon

I have a question to address to more experienced engineers in here about the load calculations around EVCs

Its clearly stated in BS7671 that no diversity should be applied to an EVC

This is a bit weird to me as to the ramifications it has

So, assuming we have a TPN 32A EVC, this means you cant apply diversity and feed it with a 20A MCB. It should always be a 32A MCB

All good

What happens in case you have a DB feeding 5 off these chargers?

Assuming you do not have a load management facility between the 5 chargers, does the 'no diversity' mean I have to assume a DB charged with 5 x 32 = 160A load????

And protect it with 160A, and install a cable for 160A etc etc etc?

Is this what no diversity means for the EVCs?

Always assuming you do not have a load management system installed in the EVCs

Thanks

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  • 0

    Yes Andy, but somehow you need to tell the customer how much they will pay for goods before sale, and just changing the tariff for load management is probably illegal. The obvious answer is that the tariff for electric vehicles should be high enough to discourage use, or make people not charge at home because the infrastructure costs are not considered for electric vehicles for political reasons. Boris wants to build 8 more nuclear stations at a probable cost of £250 Billion, presumably to be added to our electricity bills over the next few years. That is roughly £10,000 per household, so another £2,000 per year whatever the consumption, and the building is so ungreen that the outcome is no gain in anything! The point is that none of these ideas actually work, and are hopelessly expensive. Nuclear is useless for turbine backup too, so what is the point, we still need gas!

    Would you accept an electricity tariff that depended on your neighbours useage, and you didn't know the price up front? Do you never look at goods prices in the shops? If so you must be very rich!

  • 0 in reply to David Stone

    That seems a terrible response to having rubbish infrastructure.

    If we discourage people from charging at homes, we'll need even more rapid chargers (at least 50kW each) than we do already.  Because everybody would have to be using them to charge their cars.  And all those rapid chargers are going to need new infrastructure installed.

    Rather than bodging it with an inferior solution, why not have a rolling program of upgrading residential substations to allow people to slow-charge at home?

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  • 0 in reply to David Stone

    That seems a terrible response to having rubbish infrastructure.

    If we discourage people from charging at homes, we'll need even more rapid chargers (at least 50kW each) than we do already.  Because everybody would have to be using them to charge their cars.  And all those rapid chargers are going to need new infrastructure installed.

    Rather than bodging it with an inferior solution, why not have a rolling program of upgrading residential substations to allow people to slow-charge at home?

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