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how to keep 16 volts inside without using camp or sentry mode

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How can I keep 16 Volts available for equipment available even when the vehicle is asleep? I do not want to use camper or sentry mode because of the disproportional waist of energy.
Can I connect somewhere (in the cabin/penthouse) to the low voltage battery? I saw this one:
, but it is not clear whether is connection stays live if the car is asleep.
Target is a model Y 2023, build in Germany