This is another design inspired by and adapted from a KA7OEI project:
https://ka7oei.blogspot.com/2025/01/a-short-term-ups-for-mini-nuc-type-pcs.html
We’ve seen that that the small computers used in wsprsonde (and other) receive installations will reset or hang up during power outages, even when there is a UPS between the utility power and the computer’s power brick. It turns out that many UPS units have a momentary dropout when they transition to backup mode, and the brick power supplies do not have enough internal storage to ride through this transition. This is bad enough in home operation, but especially problematic in a remote installation with limited access.
There are certainly glitchless UPS products available (“on-line” UPS), but these are more expensive and sometimes “glitchless” really isn’t.
The TIS-1250 provides an alternative solution, by using a “supercapacitor” (1.25 Farads) and low-loss charging / discharging circuitry.
See more details here: