tl;dr: If you’re looking for a functional UPS, avoid the Eaton 5E series. And if you want customer service, avoid Eaton.
In an attempt to make my network infrastructure more resilient, I decided to get an uninterruptible power supply, to keep the Wi-Fi on during power cuts. After some comparisons, I settled for the Eaton 5E 850i. It was a mistake.
UPDATE (2022-12-08): After a phone call, and another follow-up message, I finally got the support escalated to a product manager, who was quick to confirm that, indeed, the UPS was defective. It took another follow-up email to get a replacement actually sent to me. Fortunately, this time, it was detected.Continue reading Eaton 5E 850i UPS: belated sign of life; avoid