Hi
I don't use the holy grail principle.
I make 24h Timelapse's and some times I leave the camera for a couple of days.

So changing White balance morning and evenings is not a option.
I got a Sony a7s.
I shot in aperture mode. With auto ISO between 200 and 3200(6400)
White balance is also on auto. A majority of the nights it does a descent work.
But sometimes it's awful.
It turns brown/yellow. Daytime - no problems.
If I start with white balance fixed.
Any option on a value thats reasonable for both nights and daytime?
(I live up north,
So the nights are not so dark during 4 month.
Then auto white balans is no problems.
It's more a problem during the dark period.
A lot of auroras and they turnout ok)

Thanks

You need to keyframe the whitebalance. There is no "one setting" for WB during 24h. That's why we have the White Balance setting :-)