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

Electrical Vehicle Chargers - No Diversity?

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

Parents
  • Most homes could accept charging an EV at 7 kw overnight when other use is limited. Charging during the evening peak could be discouraged by tariffs.

    Whilst existing street mains and substations could not supply a 7kw EV charger in every home, does anyone really expect an EV charger in EVERY home, and all used every night ?

  • Agreed, 'cos that's where diversity does come into play.

    Over the years, my commuting has varied enormously, from an 800-odd mile weekly round trip, but walking to work during the week; to a regular 8 miles per day, 5 days per week.

    In the former case, ignoring the need to charge up en route (I could just do it without re-fuelling, but not without replenishing the oil!) I'd have 5 days to recharge; and in the latter case, it would hardly have been worth plugging in each evening.

    As for the short commute, there would never have been any recharging at work because of Government policy although oddly, had I chosen to ride to work, I could still have parked my horse in the paddock like everybody else.

Reply
  • Agreed, 'cos that's where diversity does come into play.

    Over the years, my commuting has varied enormously, from an 800-odd mile weekly round trip, but walking to work during the week; to a regular 8 miles per day, 5 days per week.

    In the former case, ignoring the need to charge up en route (I could just do it without re-fuelling, but not without replenishing the oil!) I'd have 5 days to recharge; and in the latter case, it would hardly have been worth plugging in each evening.

    As for the short commute, there would never have been any recharging at work because of Government policy although oddly, had I chosen to ride to work, I could still have parked my horse in the paddock like everybody else.

Children
No Data