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How many Electric Vehicles can I charge Simultaneously?

New Zealand Residential:

Q. How many Electric Vehicles can I charge simultaneously on a typical NZ residential building?

A. One.

Most dwellings have a maximum grid connection of 63 Amps.  80% continuous load is 50 Amps. Take away a typical heat-pump of 5kW and a 3 kW hot water element leaves 12 Amps.  So that is less than a 16 Amp wall mounted EVSE that will run at 16A for a Nissan Leaf, or 32A for a Hyundai Ionic.  You need “load sharing” for more than one EVSE. 

Apartments and Workplaces:

Q. How many Electric Vehicles can I charge simultaneously in Apartments, Workplaces or Commerical?

A. Maximum of 3 if you have a 3 phase supply. 

It also It depends on your building’s load. The best way is to measure the amount of power consumed by the building with a JuiceMeter and have the JuiceBoxes consuming the available remainder with their load sharing capability. You need load sharing for more than one EVSE per phase.  

One company we worked with was lucky as their building spanned two titles, so they could ask the lines company for another feed. 

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