[Oeva-list] Power distribution

Scott Hippe scott.hippe at me.com
Tue May 31 18:44:38 PDT 2011



Most commercial buildings receive their power as 480V three-phase service so I think that is why the quick charging
stations are specified this way.  It is only in residential areas that each of the 3 phases is split off into 240v
single-phase transformers.


On May 31, 2011, at 6:33 PM, Alan Batie wrote:

> I was thinking about the quick chargers --- where they are now, and
> where we'd like to be for complete ice replacement (100+kWh packs, 200kw
> charging) and wonder about power distribution issues: the quick chargers
> take 480V power at around 100A or so; I'm guessing those come in on 22kV
> lines so it's only a couple of amps on the feeder lines, which I think
> is what the power is until it gets to the neighborhood transformer.  On
> the other hand, I've heard that getting 480V power is one of the issues
> with the quick chargers; another guess is that's because the
> transformers are all 22kV->240V, so you have to put in a special
> transformer to get 480V.  200kw charging means 500A @400V, 9A @22kV, and
> one day when we get to "EV fueling stations", you're going to be talking
> about megawatts into the station.  How difficult and/or expensive are
> those sort of things going to be?  At what current levels do you have to
> step up the voltage on the distribution lines to keep the losses to
> acceptable levels?  A megawatt @22kV is 45A...
> 
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