Hello wonder if folks have seen this. I have a a WattBox 1100-8. When powered up the front panel shows the input power as 120 and then drops to 24 volts. the unit cycles onto battery and maintains an output voltage of 120. After a couple of seconds the box will show 120 input power and it goes back to AC power. This process repeats every couple of seconds. Tried several different outlets as well as running it in a completely different building - same results. Load on the watt box is a the control 4 controller, NAS drive, Apple TV, and a wifi router. Tested with a single Usb charger for a garage work light and it does the same thing. if I have no load on the box - nothing plugged in it seems to be stable.
I want to say the box is 2015 vintage. batteries have been replaced and are less than a year old.
Any thoughts would be greatly appreciated.