It would be awesome if there was 100-200W on 12V system available. Multiple additional features, like:
vehicle always online without draining main pack.
cabin overheat protection available without main pack (fan only mode).
glycol pump running for main pack thermal management (hot after Supercharging or heavy drive)
In some scenarios it is possible to keep main pack warmer during cold season (sunny winter day).
Prolonged ACC mode with music playing while having a Barbecue party - main pack offline.
I would definitely pay 200€ for that functionality