Marc, that was quite a report. Why did you choose this method rather than hooking up directly to the main battery? With your knowledge you have probably worked with power systems and connecting to the main battery directly should not be a daunting task. That is not for beginners but you are definitaly not a beginner. I would be afraid to work with the DC to DC charger because I wouldn't want to take any chances like the large current draw due to the capacitance, a total surprise! The computer system in a Tesla is so complex that probably only Tesla should mess with it unless you want to make it your life's vocation. I have already screwed up my port module so that I can't charge my main battery by removing the rear tailight ground which also unhooks the ground to the port module, under power. It still has power after the 12 volt battery is disconnected, surprise! A 400 VDC to 120 VAC inverter is inexpensive. However, my Tesla is so expensive and I think a litttle fickle so, a gas powered generator is my choice. A Honda is so quiet and easy to start, that is my choice.