T3slaOwner
Member Extraordinaire
Air cooled transformers are typically smaller indoor only, but they used and Air cooled 112.5 KVA at the vegas site with the nema 3R enclosure. I think 500KVA is the max size dry.
Liquid cooled transformers are outdoor or in an approved vault inside which is rare for commercial applications its just to expensive.
What Jim and I were talking about is with Tesla's networking hierarchy and networking between the pedestals. I'm assuming the super chargers are networked like the destination chargers. There is a dial inside the charger for you to state the maximum incoming feeder size. The super charger site maybe set to a maximum service size which in this case is 1000 KVA or 2776 amps at 120/208V. for a dry type transformer. The network will know that it can use 1000KVA. or 800KW. (I'm looking a quicky chart to convert to KW)
So fredrick will have 800KW divided by 150KW max per car is 5 cars at maximum charge rate before everyone starts loosing charge rate. So at this site 5 people plug in at the same "A" or "B" port at the same time wanting a full charge, everyone will be at full power. as soon as the 6th person plugs in the max would be 133KW charge if we can ignore the A&B issue. the 7th we drop to 114KW, 8th would be 100KW. so same example of 8 cars charging we would really drop down 50% to 50 KW if everyone is charging at their maximum sharing a pedestal with another car A&B plugged in now.
You lost me in the math. As you say, forgetting about the A/B distribution of power, this is a... will be a 10 stall site. With all 10 stalls starting at the same time I believe you are saying there will be 800 kW available to share giving 80 kW to each car. I don't follow where the 50 kW number came from "really drop down 50%". ???
Of course the odds of this happening is slim. If you have someone almost fully charged they have already rolled back so someone else can take there KW increasing and or the A&B share directly rises 1 for 1 between the two cars.
Yes, it has been few times that I was impacted by the second car charging limit for more than a few minutes. Unfortunately it was a time when I was in a hurry and had been planning to get just 10 or 15 minutes of charge to let me complete my driving. Like the thunderstorm taking out the entire Sheetz last night this is one of those situations people will tell me they are worried about and I brush it off as not very likely. I've probably charged less than 100 times and I've been impacted at least twice and the only reason I wasn't stuck in Haymarket last night was because I was driving my truck full of kayaks. So until the charging network is expanded significantly (like 10 fold) we do need to be concerned with availability of chargers and I don't mean waiting in line.
Can you imagine what it would be like if the Quartzsite charger were to go out entirely?
So with sites like Springfield or Gaithersburg that are always full we get the low KW 37 or 57 charge rates with the smaller Utility transformers. This is why we don't get a high charge rate.
Sorry, still not following why it would be anywhere near 37 kW.
Tesla knows this and is playing the cost to install, fighting with the utility to install the larger transformer, demand factors, as viewed by the utility and or there in house demand calculation. So the doctorates at tesla came up with the great idea of the network share between chargers. this actually eliminates the argument of potentially costly demand factors, and there associated installation costs.
I've tried to discuss the potential impact of widespread home charging on the local residential distribution network and people brush me off saying the utilities will happily build up the transformers and if needed the cables. I don't believe that and I think your example shows this clearly, the utility cheaping out.
I believe the super charger locations probably work the same. The issue with the utiliities they need to see demand is now rapidly increasing and they need larger transformers.
It won't be the first time a company is penny wise and pound foolish. Like when sales and profits are down a company cuts the sales force. What?