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I have used a power inverter connected to the battery in our Subaru Forester to run a fan in the house when losing power during hurricane related power loss. Can I do this with our ID.4 and will the large battery charge the smaller one for this? If not, perhaps I'll just sleep in the air conditioned car.
 

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ID.4 1st Edition
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I have used a power inverter connected to the battery in our Subaru Forester to run a fan in the house when losing power during hurricane related power loss. Can I do this with our ID.4 and will the large battery charge the smaller one for this? If not, perhaps I'll just sleep in the air conditioned car.
 

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iD4 Pro Performance Max - Ordered July 2021 - Delivery December 2021 (hopefully)
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This is a bit of an unanswered question right now! Lots of people are asking for different reasons (eg to power a 12V fridge when camping). But I haven't seen an answer. Test is easy to do!

1) Move the fuse so the 12V socket in the back is powered all the time.
2) Measure Voltage across the 12V battery (and continue to measure throughout the test). Voltage should read 12.8V (or thereabouts).
3) Attach a load, ensure it is continuous, a few hundred Watts is perfect.
4) Monitor Voltage.

The voltage could slump a little as soon as the load is applied (depending how big the load is) eg to 12.6V. As power is drawn from the 12V battery and it becomes discharged the DCtoDC converter will hopefully kick in and Voltage would suddenly rise to 13.8 or 14.4V (or something similar). If this happens you know you're good to go and can use your inverter as you describe without exhausting the 12V battery.

An alternative is to force the DCtoDC charger to stay on by keeping the seatbelt connected and putting a weight on the seat.
 

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ID.4 Pro S AWD
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Short answer, yes. I have a 1000W I connect to the 12V battery. Leave the ignition on and you're good.
Where did you connect the negative cable from your inverter? Battery neg terminal or a vehicle ground?
 

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iD4 Pro Performance Max - Ordered July 2021 - Delivery December 2021 (hopefully)
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Short answer, yes. I have a 1000W I connect to the 12V battery. Leave the ignition on and you're good.
Have you experimented and confirmed that the DCtoDC converter is only activated when the “ignition“ is on? Even if the 12V battery is depleted? Bit annoying if the car would sit there and allow itself to be crippled by a dead 12V battery when it has the means to prevent that sitting there doing nothing…
 
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