this post was submitted on 25 Sep 2026
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DC UPS for router? (retrofed.com)
submitted 2 days ago by voyagertest@retrofed.com to c/selfhosted@lemmy.world
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Hi y'all looking for advice here

I selfhost a nextcloud server and a NAS for backups, and one of my challenges has been data corruption after power failures.

I went and bought some consumer UPS units about 5 years ago, which helped, but now the batteries are starting to fail, and I'm not protected from power outages until I replace them.

I have the router on UPS as well so the computers can communicate with each other that the power has failed and it is time to gracefully shut down (using NUT).

However the router itself uses quite a bit of power and I am hoping to make a smarter decision this time around when getting a UPS.

The router's power supply is 12V5A with a barrel style jack, so i have been searching for "DC UPS 12V 5A" to try and find something compatible that wastes less energy converting from battery DC to AC for the power supply to then convert back to DC.

But the only thing I've been able to find are these units designed to power electric doors: https://www.amazon.com/dp/B0D8VLPRN2/

I'm not sure if this would even be safe to use with a router, and i don't know how i would wire it up to the router either.

I think i just don't have enough knowledge to know how to shop for an appropriate DC UPS, or if such a thing even exists.

Anyone been in a similar situation?

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[–] 1Fuji2Taka3Nasubi@piefed.zip 4 points 2 days ago* (last edited 2 days ago) (1 children)

How about a portable power station? Basically a huge mobile battery with AC input. Some can switch over on power failure like a UPS. Some has USB PD (get 12V DC with the right cable) or car lighter socket (12V DC) or direct 12V DC output.

I’m talking about these, just a random article from my search:

https://techwriteredc.com/best-portable-power-stations/

[–] CorrectAlias@piefed.blahaj.zone 5 points 2 days ago

If you're going this route, you may want to pay attention to the switchover time. For most consumer hardware, it can handle 10-20ms of switchover time. However, enterprise grade stuff is more sensitive to power fluctuations and sometimes needs near instantaneous switchover. It can get very expensive if you want LiFePo4 (like many of these portable stations) while also being "on line" (meaning instant switchover).

There are middle ground options which have switchover timing of 5-8ms that are also LiFePo4. LiFePo4 is great because the chemistry doesn't have a huge fire risk and it can do more cycles than a lead acid battery.

Anyway, my bad for rambling.