In another thread, @JayEmm1asked about the automatic shutoff on the SOLIX C1000 when using the cigarette port.
TLDR: The C1000 has a smart socket function and it will auto-shut off when the power draw is less than 10W for an hour. This prevents unnecessary power drains. Firmware update V1.3.2 optimized the setting logic for energy-saving mode of the car port to accommodate long-term use of low-power devices.
This feature is also enabled for the AC outlet: If nothing is plugged in and the output power is less than 15W, the AC outlets shutoff but if something is plugged in, whether it is on or not, the AC outlet will not shut off.
I created a separate post to highlight it, and in hopes that people really do use search functions to find answers, hahaha.