Charging Away from Home - Electric Dryer Outlet Compatibility

[carbonizedbrett]

The Tesla UMC (Universal Mobile Charger) has AC adapters for 15, 20, 30, and 50 amp plugs.
There is a resistor in the adapter that specifies what the adapter is to the UMC.

15 amp 120 volt plug 139 Kohm resistor
20 amp 120 volt plug 74.5 Kohm resistor
30 amp 240 volt plug 33 Kohm resistor
50 amp 240 volt plug 9 Kohm resistor
The maximum charge current is 80% of the plug value.
i.e. 12, 16, 24, 40 amps.

So simple and elegant!

Tesla also has temperature sensors in the plug and other bits, don't they?

I was kind of hoping to see two different resistances across the Ford's outer connectors for the NEMA 5-15 and 14-50 dongles..... That would have suggested a Nema 6-20 dongle was technically possible.

I did take a heat gun to my plug while measuring resistance. The resistance seemed to drop by a couple of hundred ohms - didn't seem significant but I didn't want to heat the plug too much....

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