Hi guys, my APC 1500 is acting real weird at night since 2 days it just trips from KESC load and all its lights start to blink at once. if i switch to battery backup it runs fine but the moment i switch to kesc connection it trips and all lights start to flash at once. yes voltage is kinda low these days and when i turn the ups on it shows on the panel the amber light. It works fine in the day and does not trip.
Is this a hardware or software problem and should i put a stabilizer to it? i have a puma pvsl 500 stabilizer..