@BLUETTI_CARE I did a test today looking at the app and the sun. When the AC180 is about 8A input current at the PV, the cutoff is done just by passing a thin cloud. Normally the thin cloud is not cut off below an input current of approximately 7.8A. The input wattage cannot be 0w on a cloudy day with the sun visible. There is a bug that cutoff is applied to MPPT control.
A passing thin cloud will not cut off unless a current limit of 8A or 10A is applied. I carefully selected and re-installed the solar panels to avoid current limiting. No problems after that. Thanks @BLUETTI_CARE
I don’t understand voc?
Voltage Open Circuit. - Maximum voltage the panel should produce with not load. It might go a bit higher when it’s cold. You usually want to use the VOC to make sure you do not exceed what the device you are connecting them to can handle. If you use your panels in series, you want to add up the VOC of each panel and make sure it is below what your device can handle.