So, when the discussion turns to J1772 charging and 30-amp capable systems, are we actually talking about 24 amps on the Roadster screen anyway? 24 amps happens to be exactly 80% of the 30-amp rating, so I don't think Tesla Motors needs to change the firmware at all.
Now that there are several electric car brands on the road and various charging stations, I hope that there is a standard for discussing current ratings versus actual current draw.
Scott451 posted this:
An EV is allowed to draw 80% of the breaker rating as a continous load. Since the breakers are all increments of 10A, using a 30A,40A,50A,60A breaker gives 24A, 32A, 40A, 48A charging current. The UL (Underwriters Labs) screwed this all up when the refused to certify the ITT cannon J1772 plug for 32A [ref?]. They only allowed 30A, so now we're stuck with a bunch of 30A chargers on a 40A circuit.
In this thread:
Tesla/J1772 adapter available from Tesla's website
Because of that, it is hard to know whether a 30amp charger is really a 30 amp breaker with a 24 amp max, or a 40 amp breaker with a 30 amp max.
If it was 32, it would be obvious. I think you can usually assume its a 40 amp breaker with a 30 amp max.
Last edited by richkae; 06-26-2011 at 04:18 PM.
That would be hard to change. Everyone talks about 100 percent. Asking the world to all change to 80% is not likely.
The world loves to be deceived.
Telsa Tattler allows you to set 30A.[/SHAMELESS PLUG]
Last edited by scott451; 06-27-2011 at 12:18 AM. Reason: Integrated TEG's comments
Does the Tattler allow you to set any current with a granularity of 1A?
19A would be a useful number over here, for example.
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