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Supercharger - Bothell, WA

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I've never come across a Tesla Supercharger that was powered by 120/208. On V2 and Urban sites, the individual chargers within each charging cabinet are each powered by one leg of 277 volts (actually 280ish because most V2 sites are boosted to just over 500 volts incoming AC. There are 12 chargers in four groups of three - each charger in a group is on a different phase. Trying to do that with 120-volt legs would reduce the output substantially since the chargers can only handle just over 40 amps each.
 
Lots more work going on today.
 

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Nope, all 72kw stations in Seattle area are open (except Bothell of course). Your post was at 4:30am when the downtown parking garages are closed, maybe thats what you saw.
You are right. Those are open now.
Tesla will not upgrade urban or V2 to V3/V4. It is cheaper for them to develop a new site. There is no infrastructure from V2 that can be reused. Different conduit layouts, bigger transformers, etc.
Thanks for the explanation. Back to keep eye on 201st Pl upcoming one.
 
I've never come across a Tesla Supercharger that was powered by 120/208. On V2 and Urban sites, the individual chargers within each charging cabinet are each powered by one leg of 277 volts (actually 280ish because most V2 sites are boosted to just over 500 volts incoming AC. There are 12 chargers in four groups of three - each charger in a group is on a different phase. Trying to do that with 120-volt legs would reduce the output substantially since the chargers can only handle just over 40 amps each.
This casts a bit of doubt on the whole 208V thing. Inspection clearly states 208V service above 800A. 4000A 208V for 10 Urban makes more sense than 4000A 480V. 1400kVA vs 3300kVA. Definitely a head scratcher though.
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Per pictures here, there is a 750kVA 208V transformer next to the Tesla one so 208V being the only available service is plausible.

Edit:

208V service to step up 480V transformer that feeds the chargers. Per the original installation electrical inspections. Main service is 208V but chargers are fed 480V.
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