On 07/03/2018 11:25 AM, Lawrence Rhodes via EV wrote:
Tesla Tap recommends you test the voltage of a Tesla destination charger before using. Could I do that with just a meter? I suspect not. I can't understand why a destination charger would be more than 250vac. Lawrence Rhodes
I just read that also, though I have little interest in having a Tesla Tap. I can't imagine what they are worried about. I've never seen a 120vac Tesla connector, but I guess they are possible. I further guess that there may be some conversion onboard chargers that don't want to see 120vac. There are quite a few Tesla charge stations out there that are ~208vac rather than ~240vac.
The single reason for all the relays and J1772 silliness is to make sure the connector pins are not hot until the charger is connected. That is, you will not likely be able to see voltage on J1772 pins.
Teslas tells you the input voltage and allows you to adjust the demand current. You can then observe voltage drops as current increases and perhaps adjust the demand. A drop of more than ~10 volts likely indicates pulling too much current for the conductor size and length. On a conversion, you might monitor that input voltage at the charger with a multimeter.
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