Electrical Vehicle Chargers - No Diversity?

In my view, in the absence of any form of load control, then no diversity should be applied. 

If it says 32 amps, then it means 32 amps, and that in turn means 160 amps in total for five such chargers.

It might be possible to allow a little diversity on a large number of chargers. With say 5 chargers it is reasonable to expect that all 5 will be used at the same time. With say 100 chargers it MIGHT be reasonable to assume that only 90 will be used at the same time. A lot depends on the expected pattern of use.

100 charging points at a large office building might all be used at the same time if everyone starts work at about the same time.

100 charging points in say a supermarket car park are less likely to be all used at the same time. Customers arrive largely at random and then leave largely at random. A supply sufficient for say 60 chargers might in practice be adequate. By the time customer 61 arrives, it is likely that one or more of the first 60 will either be fully charged, nearly full, or be unplugged preparatory to driving away.

In practice some form of automatic load control is very desirable, many types exist. Some even allow for on site solar generation, limiting the total load to say 100 kw from the mains, but allowing a total charging demand of say 150 kw if 50 kw of on site solar generation is available.

In my view, in the absence of any form of load control, then no diversity should be applied. 

If it says 32 amps, then it means 32 amps, and that in turn means 160 amps in total for five such chargers.

It might be possible to allow a little diversity on a large number of chargers. With say 5 chargers it is reasonable to expect that all 5 will be used at the same time. With say 100 chargers it MIGHT be reasonable to assume that only 90 will be used at the same time. A lot depends on the expected pattern of use.

100 charging points at a large office building might all be used at the same time if everyone starts work at about the same time.

100 charging points in say a supermarket car park are less likely to be all used at the same time. Customers arrive largely at random and then leave largely at random. A supply sufficient for say 60 chargers might in practice be adequate. By the time customer 61 arrives, it is likely that one or more of the first 60 will either be fully charged, nearly full, or be unplugged preparatory to driving away.

In practice some form of automatic load control is very desirable, many types exist. Some even allow for on site solar generation, limiting the total load to say 100 kw from the mains, but allowing a total charging demand of say 150 kw if 50 kw of on site solar generation is available.