Very Neigbourly indeed!
Discussion
Had a request to cast my eye over something the other day....
A group of neighbours had managed to source a fast charger, then realised that it can only charge as quick as it can with the right supply...
They got a sparkie in who installed three isolation transformers, and then connected the transformers to the charger. three phases made from three seperate single phases....
All the wiring was good, right cable sizes and done so that their own RCD's were not affected.
checked supply and now they are getting a decent fast charge off of the charger.
A group of neighbours had managed to source a fast charger, then realised that it can only charge as quick as it can with the right supply...
They got a sparkie in who installed three isolation transformers, and then connected the transformers to the charger. three phases made from three seperate single phases....
All the wiring was good, right cable sizes and done so that their own RCD's were not affected.
checked supply and now they are getting a decent fast charge off of the charger.
I had a three phase 415v supply in my last house with the intent of using it for rapid charging but in the event sold the house so someone else will have the benefit. The supply was actually already there as the property had a large garage which was used for manufacturing.
I suppose it could be useful to have a couple in apartment complexes of places where people have no individual offstreet parking. The standard Ohme charger I have now is totally adequate for my needs.
I suppose it could be useful to have a couple in apartment complexes of places where people have no individual offstreet parking. The standard Ohme charger I have now is totally adequate for my needs.
Sheepshanks said:
Nomme de Plum said:
I had a three phase 415v supply in my last house with the intent of using it for rapid charging but in the event sold the house so someone else will have the benefit.
....
I read somewhere recently that all new builds have to have three phase now.....
S6PNJ said:
ruggedscotty said:
They got a sparkie in who installed three isolation transformers, and then connected the transformers to the charger. three phases made from three seperate single phases....
How did they change the phase of the 3 separate feeds? 
Three phase power supplies are designed to breakdown into 3 separated 1 phase power supplies. Configured in this way its no longer a 3 phase charger as each user has only a single phase, but could supply up to 100 amp per phase (in the UK).
Assuming they all Tesla's they could do this, but most EVs can only charge at around 7kw from an AC power supply (as others have pointed out). Why you would want to got the expense it a great question. You need a cable running to a nearby 3 phase network outlet, 3 phase distribution board and a 3 phase qualified sparky to balance to power demand across the phases. Ho yes and a 3phase smart meter. They would have got a great solar and battery system for the same money.
Most people simply want to plug the car in over night and take advantage low rate tariffs.
Assuming they all Tesla's they could do this, but most EVs can only charge at around 7kw from an AC power supply (as others have pointed out). Why you would want to got the expense it a great question. You need a cable running to a nearby 3 phase network outlet, 3 phase distribution board and a 3 phase qualified sparky to balance to power demand across the phases. Ho yes and a 3phase smart meter. They would have got a great solar and battery system for the same money.
Most people simply want to plug the car in over night and take advantage low rate tariffs.
Mr E said:
SpidersWeb said:
That sounds like an awful lot of effort for a three phase supply, when very very few EVs can take a 22kW AC charge, so rather surprising that these three neighbours all own such cars.
All recent (at least 2019 on) teslas can take 22kw on three phase I believe. As with a lot of such 'three phase' cars a Tesla can only charge at 11kW not the 22kW the EVSE can supply due to the limitations of the onboard charger, and frankly 11kW isn't going to charge an awful lot faster than a 7.4kW EVSE.
Those which can charge at the full 22kW are pretty limited - www.evspecs.org/electric-cars-ac-charging-comparis...
SpidersWeb said:
I don't believe so - www.tesla.com/en_gb/support/charging/onboard-charg...
As with a lot of such 'three phase' cars a Tesla can only charge at 11kW not the 22kW the EVSE can supply due to the limitations of the onboard charger, and frankly 11kW isn't going to charge an awful lot faster than a 7.4kW EVSE.
Those which can charge at the full 22kW are pretty limited - www.evspecs.org/electric-cars-ac-charging-comparis...
My lowly Nissan Townstar van charges at 22KW, its pretty poor of other EV manufacturers to not make this standard, as its so much quicker. Just over 2 hours does me around 40KW charge. As with a lot of such 'three phase' cars a Tesla can only charge at 11kW not the 22kW the EVSE can supply due to the limitations of the onboard charger, and frankly 11kW isn't going to charge an awful lot faster than a 7.4kW EVSE.
Those which can charge at the full 22kW are pretty limited - www.evspecs.org/electric-cars-ac-charging-comparis...
TheRainMaker said:
S6PNJ said:
ruggedscotty said:
They got a sparkie in who installed three isolation transformers, and then connected the transformers to the charger. three phases made from three seperate single phases....
How did they change the phase of the 3 separate feeds? SpidersWeb said:
Mr E said:
SpidersWeb said:
That sounds like an awful lot of effort for a three phase supply, when very very few EVs can take a 22kW AC charge, so rather surprising that these three neighbours all own such cars.
All recent (at least 2019 on) teslas can take 22kw on three phase I believe. As with a lot of such 'three phase' cars a Tesla can only charge at 11kW not the 22kW the EVSE can supply due to the limitations of the onboard charger, and frankly 11kW isn't going to charge an awful lot faster than a 7.4kW EVSE.
Those which can charge at the full 22kW are pretty limited - www.evspecs.org/electric-cars-ac-charging-comparis...
I remembered it could do 3 phase. I forgot it didn’t do it at 7.6kw per phase.
I’ve never used 3 phase.
Sheepshanks said:
TheRainMaker said:
S6PNJ said:
ruggedscotty said:
They got a sparkie in who installed three isolation transformers, and then connected the transformers to the charger. three phases made from three seperate single phases....
How did they change the phase of the 3 separate feeds? My biggest question would be why bother to put the phases back into a 3ph supply to a 22kw charger, instead of 3 discreet 1ph 7kw chargers. One per house... I'd have thought they'd get a lot more overall charging done that way. Perhaps the three houses somehow shared a single off street parking space!?
Mr E said:
SpidersWeb said:
That sounds like an awful lot of effort for a three phase supply, when very very few EVs can take a 22kW AC charge, so rather surprising that these three neighbours all own such cars.
All recent (at least 2019 on) teslas can take 22kw on three phase I believe. Gassing Station | EV and Alternative Fuels | Top of Page | What's New | My Stuff