Switching to battery in under 10 milliseconds is what lets a station behave like a real uninterruptible power supply for a desktop, a server or a medical device, and the Delta 3 Classic states that figure plainly. Most computers ride through a gap of that length without rebooting, so a brownout becomes a non-event. The unit also offers 1800 watts, 3600 watts of surge with X-Boost, and a 100 watt USB-C output that can charge a laptop directly.
A home office with a desktop, two monitors and a router draws around 150 to 250 watts, which puts 1024 watt-hours at roughly three to five hours of runtime. That is enough to finish a meeting and save work, and far more than a conventional UPS offers. Fast AC charging to 80 percent in 45 minutes means it is ready again before the next storm. Compared with the 1191Wh UDPOWER it has less energy but faster switching, and against the 288Wh BLUETTI it carries more than three times the storage.
Keep it plugged into the wall so the UPS function stays armed, set a charge limit in the app to protect the cells and give it a bit of air around the case. Fans spin during fast charging, so choose a spot where a few minutes of noise will not bother a call. If you share the desk with a standing-desk motor or a printer, keep those on the wall circuit, since laser printers draw large startup surges that waste battery.
What works
- Under 10ms switchover protects desktops and servers
- 1800W output with 3600W surge in X-Boost mode
- 100W USB-C output charges laptops directly
- 0 to 80 percent charge in 45 minutes
Watch out for
- Fans run noticeably during fast charging
- Heavy for a unit that sits under a desk
- Capacity is modest for an all-day outage
Spec sheet
- Capacity
- 1024Wh
- AC output
- 1800W, 3600W surge with X-Boost
- UPS switchover
- Under 10 milliseconds
- Fast charging
- 0 to 80 percent in 45 minutes
- USB-C
- 100W output





