Nissan X-Trail e-POWER 2023 Owners Manual
11.17. Variable voltage control system
Do not ground accessories directly to the 12-volt battery terminal. Doing so will bypass the variable voltage control system and the vehicle 12-volt battery may not charge completely.
Use electrical accessories with the e-POWER system running to avoid discharging the vehicle 12-volt battery.
The variable voltage control system measures the amount of electrical discharge from the 12-volt battery and controls voltage generated by the generator.
Owners Manual