This will reduce the number of cases where bigger transformers need to be installed. And perhaps even more importantly, to remind, charging in residential areas is mostly off-peak, at times when there is much less stress on the grid. Also, the utilities could surely further improve load balancing by having areas that can be switched to any of the 3 phases as needed to balance other areas. That shouldn't be difficult, even if requiring a change in how the areas are connected to the transformers. I guess.
Yeah, I follow you... Well, the part about selective phase switching seems like it might be a bit 'far fetched', but I don't really know for sure.
Yes, 'smart grid' EVSE with remote disconnect to reduce load or maintain balance as needed seems to be in the works.
We've heard that the utilities in the US, even though they don't usually install 3-phase in residential areas, can still do so if asked for. So, for example, close to each transformer with which they might have difficulties in load balancing, they could add 3-phase service to a number of residences, and for the EVs in these residences, install special EVSE. These would work like other J1772 EVSE off a single phase, but in addition to other smart-grid abilities like remote-on-off, it would have remote-choose-which phase-to-run-off. So they would have a certain number of EVSE which they can assign to any phase, and use that to balance the load-per-phase. If something like that is really necessary, it should be an affordable thing(for the utilities) to do.
Maybe, but a three phase charger would be a much more elegant solution.
Perhaps use the DC fast charge port with an "slower" 5-15kW 3-phase off-board charger. The main (only?) benefit would be a balanced load for the utility.
Some quotes from a friend who works in the EV charger business in the USA:
I think the three phase balance issue may be bogus. Most neighborhoods I've seen only have single phase feeders from the substation out, so the balance is between large numbers of blocks of houses. The only three phase that is common on poles seems to be in industrial or mixed use areas. Changing houses to three phase would be tremendously expensive.
Maybe newer subdivisions are different...
And this is not RWE (or anyone else's) marketing blown out of proportion. We now have close to 5000 Mennekes charging posts announced for the coming year in the UK alone. The AC equipment is one or two orders of magnitude cheaper than DC.
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