Technical Support wrote:
Is anything plugged into the AC outlets when doing this test? If so, unplug those and see if the lights come on.
With the battery removed, plug the charger into the inverter, where the battery would connect. With nothing plugged into the AC outlets on the front of the inverter, turn the inverter on and see if there are any lights.
Also try plugging in the battery directly to the inverter to see if there is any change.
I tried testing with both scenarios; things plugged into the outlets and nothing. Same result.
I removed battery just now, plugged charger into inverter where the battery would normally connect. I then powered on the inverter and got an immediate orange status light which quickly turned green within 1 second. Then in the next few seconds, the battery charge indicator lights came on one at a time, with it now sitting at 3/4+. There is nothing in the outlets at this time.