Our office building occasionally has complete blackouts for hours. Our UPS's work fine for short time power outages, but after a prolonged power outage and upon utility power restored, some of our UPS don't restart themselves and don't send power to the connected load. I have to go to the office and manually press the on/off button on the UPS, yikes.
I asked APC tech support and they wrote vaguely that their cheaper BackUPS series wont restart, but their SmartUPS models will. I couldn't find any product info on their websites that addresses this topic on restarting after long power outages, which I find disturbing since I dont think I'm the only person to have this question/concern.
Question: How do I tell which UPS brands/models offer ability to restart itself as expected after a long power outage? I'm open to other brands such as TrippLite, CyperPower, etc,