First time poster here, don't have a Tesla yet but I'm researching my next EV. A Model Y (which I assume to be similar but not identical to a 3) is a strong contender thanks to this thread, since I live in a community that has power outages several times a year. (The Ioniq 5 / Kia EV6 newcomers look like potentially strong competitors, and will have this functionality built in. I'm very likely to prefer the Model Y if I can make this work.)
The one thing that I don't see covered is whether this mod takes power from a place in the system where it plays well with the Tesla charge management. (Not sure if it just watches pack voltage, or counts kWh in and out.) Depending on where the system is tapped, this may be a load that the car is not expecting to see. Has anyone actually done this, run some substantial loads for days, and seen that SOC tracks as expected? No alarms or codes thrown? It would be a real pain to go through all this, especially after having partially based the decision on buying the car on its success, only to find there is some unexpected glitch or failure when you really need it. I'm also rather interested in how much system overhead (consumption) the Tesla adds while in Camp or Sentry Modes.
Bottom line - has this been thoroughly tested and proven effective? Anyone tried it on a Y and found differences in installation?