Interesting I’ll have to look into it. Just got a text from home it’s back on.I have 3 plugged into it currently. YES. But not for days. Just hours. When I hear.. BEEP BEEP BEEP at 4 in the morning, I know some drunk or a tree took a line out somewhere close. Helps me sleep better, hearing that faint beep. We lost power during Hurricane Irma for seven days. The BBU lasted about 9 hours with one little giant 9300 plugged in.