I find some random issues that is still unknown. I'm using mean well SMPS 12v, 3A for supply and charging 2 cell battery 7.4v with a charging current 1.2A. The supplies are parallel which is switched by LTC4412 power path controller.
The issue I'm getting in my product: When turning on the AC supply device stops working and runs only when the battery supply is present.
This issue doesn't happen in all the devices. In some similar devices it rarely occurs and in some devices it is frequent. The AC voltage observed is 230v (L & N) 30v in (G & N). What might be the issue in the input side?