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Has anyone tried the new anker or ecoflow lithium portable power stations as a UPS?

It's very likely their switching time between wall power and battery isn't quick enough to keep a computer on. With ATX you need to switch power in no longer than 16ms else the computer will shut off.

Ecoflow switching time is listed at “<30ms” and the new Anker power stations are listed at “<20ms” so not the speed you’re looking for. APC’s tend to be listed at less than 12ms.

EcoFlow has non continuous output. Shouldnt be a problem for PC, but some loads ae sensitive to it:

EcoFlow Delta Pro - RTFM Dummy! EEVblog2 https://www.youtube.com/watch?v=5JT8M8v_zNg

Bluetti dos much better:

Bluetti AC500 / B300S Power Bank - Review & Teardown mikeselectricstuff https://www.youtube.com/watch?v=RuEO17uvI8M

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