There are 2 pilots, "pilot_low_v" and "pilot_high_v". "Pilot_high_v" is always changing from 0 to 12V, but "pilot_low_v" is not changing and stays around -12V all the time. Here is the graph with "pilot_low_v"
Tesla Universal EVSE Connected, but 12V battery drained
- Thread starter Demian Johnston
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There are 2 pilots, "pilot_low_v" and "pilot_high_v". "Pilot_high_v" is always changing from 0 to 12V, but "pilot_low_v" is not changing and stays around -12V all the time. Here is the graph with "pilot_low_v"
MrFixit
Well-Known Member
What type of tool are you using to get these plots?
Tesla API > NodeRed > InfluxDB > Grafana
Tesla API: http://TUWC_ip/api/1/vitals
NodeRed: https://nodered.org
InfluxDB: https://www.influxdata.com
Grafana: https://grafana.com
Running in Docker Containers: https://www.docker.com
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I would also like to check the resistance of the Tesla J1772 adapter, but unfortunately, there's no way to remove it from the handle or the charger itself.
MrFixit
Well-Known Member
How do you charge a Tesla with this then?
I thought the cable terminated in a NACS handle, and a provided J1772 adapter was used to connect to a non-Tesla.
When I watched the video, there was a clever way that the adapter stayed clipped into the box (when charging a Tesla), but it is a separate adapter that does come off of the NACS handle...
You could always check the resistance in-place (but be sure to disconnect the line power, by turning off the circuit breaker).
I thought about this as well, but the resistance measurement won't be accurate because the adapter is connected inside the TUWC.
MrFixit
Well-Known Member
OK, I see. The adapter does come off.. They just have a clever way to capture it when it is docked,
I'm sure it can be removed when not docked if you can find the right clip to press (or similar).
Keanen
Member
@MeNerdHair, I have finally completed the test you requested. To my surprise the Tesla adapter did beep in the continuity test. Here are the results. Sorry for my hand being in the way of the multi-meter
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Can you share the process for removing a Tesla J1772 adapter from a NACS charging handle?
Thanks!
Keanen
Member
let me know if you get it or not.
Yes, thanks! Here are the internal Tesla J1772 adapter schematics. There are no resistors or buttons present. I don't know if this is good or bad, but there's nothing to modify in the official Tesla to J1772 adapter.
Out of curiosity, I enabled "pilot_low_v" signal logging while the Clarity was connected with the official Tesla to J1772 adapter. The "pilot_low_v" signal shows spikes every minute or so. It seems like the TUWC is "fighting" the Honda Clarity after charging is complete.
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MrFixit
Well-Known Member
OK, now what you need to know is how the resistors / switch present themselves at the output of the NACS handle. Since the 1772 adapter just has straight-thru connections, it is apparently depending on those functions coming from the handle. I think you can measure the resistance looking back into the handle with the TUWC safely disconnected from the line. You can see if pressing the button on the handle affects the resistance.
If you don't see the resistors, then it is indeed possible that the NACS handle does not have the passive resistors, but simulates them actively when it is powered on. You don't want to be poking around there with power however so that may be the end of things that you can try.
Out of curiosity, I enabled "pilot_low_v" signal logging while the Clarity was connected with the official Tesla to J1772 adapter. The "pilot_low_v" signal shows spikes every minute or so. It seems like the TUWC is "fighting" the Honda Clarity after charging is complete.
Yeah I got notifications today from the honda app every minute saying that charging was complete.
Anyone found a good way to cancel this out yet? I was using scheduled timers for both, but half the time in the morning it wouldn't properly start charging and thus leave me with half or lower battery when I go to leave, which is clearly not ideal.... I've tried messing with compatibility mode or regular and had issues with both unfortunately.
Its easy enough to force charging outside the charging window (since the car won't start charging if plugged in after the charging window... part of the problem above!) by holding down the charge button on the FOB for a few seconds. Is there also a way to force the tesla unit to charge so I can make its schedule very limited to stop it from killing the 12v?
Not sure if its the "automatic restart" feature that could be doing it as well, it stops and wants to charge it again.
I know there is the long press to setup the wifi, but do the buttons do anything else, or a way to tell it to start charging using them even if outside the charging window?