great video. Thanks for sharing.
Quick nerdy question. at 3:48 in the video, he switches on the two batteries, selects "power from battery", but then switches on Tank 1 & 2 fuel pumps before checking the battery and bus voltages.
He then switches the tanks off again, before hooking up the external power.
Any idea why he powered up the tanks? Is it to create some current draw on the battery for the tests?
As I said... nerdy question, but I am genuinely interested.