FYI for the APC Back-UPS "Pro" - the "Pro" model's topology is line interactive. (Or at least my Australian 1500 version is, as well as the other "Pro" models I checked.)
FYI for the APC Back-UPS "Pro" - the "Pro" model's topology is line interactive. (Or at least my Australian 1500 version is, as well as the other "Pro" models I checked.)