Lights are on and no one is home after power outages with battery backup.

[SephYuyX]

I'd consider the UPS an "older" model, but not ancient. I'm using a 240v "Double Conversion Online" SmartUPS RT SURTD5000VA, so in theory there is near zero fluctuation or spikes when transferring. It has an additional external battery pack, and I then use an APC SURT003 isolation and step-down transformer for 120v devices, which leads to a couple PDUs, and then feeds devices off of that. There are other PDUs off of the main unit that feed 240v devices.

Not much to configure on this device other than upper and lower bypass ranges, but those only apply when bypass mode is utilized, which I never do. Output always hovers around +-1 at 240v, same with 60hz.

Nothing else connected to the 3100, just power, wan, and lan1.