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> (I'm also trying to fit a Li-Ion battery/UPS between the PSU and components)

This should totally be a thing. I wish it was a thing. It doesn't even have to provide hours of runtime, just needs to be enough to handle the occasional stupid California brownout.

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Out of curiosity, wouldn't a conventional consumer UPS take care of that?

yeah. but it's more efficient to have the battery be on the output side of a PSU, since that's gonna be DC.

You might want to reconsider. I've found a separate UPS to be invaluable because, as you'll find, just getting power to the box is not sufficient. Other devices need power as well, especially network switches and displays.

Yeah, it is the most efficient way to power everything (no conversion losses). 30 minutes is enough tbh.

The battery will fit in an empty PSU case, I just need some custom cables and connectors for the passthrough, my biggest problem is charging and switchover. Looks like I will need a custom board for that. I thought it'd be easier heh

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