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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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    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.

    I don't understand - prices could either be fixed (e.g. super-cheap for say 1 hour of the overnight off-peak, different houses on the street being allocated different hours) or could be dynamic with prices pushed to the customer up to 24 hours in advance - like the Octopus Agile tariff already does. Neither sounds even slightly illegal to me - it's the same basic principle as the old E12/E10/E7 tariffs - helping to match demand with available supply - if done a little more smartly.

       - Andy.

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  • 0

    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.

    I don't understand - prices could either be fixed (e.g. super-cheap for say 1 hour of the overnight off-peak, different houses on the street being allocated different hours) or could be dynamic with prices pushed to the customer up to 24 hours in advance - like the Octopus Agile tariff already does. Neither sounds even slightly illegal to me - it's the same basic principle as the old E12/E10/E7 tariffs - helping to match demand with available supply - if done a little more smartly.

       - Andy.

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