The 400a Tesla question

[wyreman]

So I have a quote to put in one maybe four Tesla lvl2 charger. It's a condo with (8) 70a meter and one common. 400a main single ph 240v

I calculate my unit to be using 54a @
1300 ft^2 with electric dryer

If I put in the 30a charger I calculate I need 64a =) so 70 ok

If i put in the 40a charger I calculate I need 67a

I have never calculated the disco on these multi bank meters

If put in 3 40 amp teslas and they're all within 70 subeeds then the 400 amp main must be still plenty good

Question is how do you calculate the main breaker for the The multibank multifamily application
Thanks!

In belief, man can do anything

 

[wyreman]

This is also funny

the original guys just hung these boxes on the wall without any pipe or wiring


In belief, man can do anything

 

[wyreman]

art 220 but how do you classify the level two charger?

art 220 but how do you classify the level two charger?

here's a link to a worksheet I'm building regarding the meter sizing for the 8 units plus the common.

cant use the optional method for the single unit as it is less than 100a

Using the standard method the service, without the car charger is required to be Minimum Service Entrance Size = 67.916666666667 amps

And with a fake car charger ct in the parking spots, you can see that there is no margin built into each individual service.

If I upgrade the individual units to 100a I could squeeze two teslas in there and end up with exactly 400a



http://bit.ly/1qcGfmK

 

[wyreman]

The last word I come up with is that the 400a can support one more load only.
I classify the LVL2 charger as a built in appliance for the one unit and derate to .75
spreadsheet updated

 

[wyreman]

 

[Rampage_Rick]

the original guys just hung these boxes on the wall without any pipe or wiring

Wow... Just, wow... Those EVK02-M pre-wire kits are still $80 a pop, not including the lovely green bell box.

Now, are you looking to install the actual Tesla HPWC charging stations, or a generic J1772 EV charging station?

First reason I ask is that I believe the lowest charge rate on the HPWC is 40 amps on a 50A circuit. Second reason I ask is that a Tesla station will only charge Teslas, whereas a J1772 station will charge Teslas, Nissans, Chevys, Fords, BMWs, etc. Also, Teslas are about the only ones that will draw more than 6.6 kW so more than 30A is often overkill.

If you're still short of power, you could even go lower. I've got a Clipper Creek LCS-25 which is limited to 20A. It's a very popular and dependable unit amongst Volt drivers, though the 4.8kW max charge rate might be a tad slow for some people.