this post was submitted on 09 Dec 2024
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56
Budget Homelab UPS Recommendations? (Used or New) (leminal.space)
submitted 1 week ago by [email protected] to c/selfhosted
48 comments fedilink hide all child comments
 

I'm running a rather small homelab and am hunting for a good UPS to help keep everything running smoothly. My top priorities are:

  • Just enough battery life to keep things running until they can be shut down
  • Compatible with open source software for monitoring and automated shutdown

Would I have better luck getting a used one and a new battery, or a brand new unit altogether? Anyone have one they don't need anymore, on that note? πŸ‘€

Thanks for the advice!

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[–] [email protected] 3 points 1 week ago (1 children)

That's better, but you still need to have single wire to loop it around, which is not normally accessible. And at least in here the term 'multimeter' spesifically means one without a clamp, so you'd need to wire the multimeter in series with the load and that can be very dangerous if you don't know what you're doing.

Also, cheap ones often are not properly insulated nor rated for wall power (regardless of your voltage), so, again, if you don't know what you are doing DO NOT measure current from a wall outlet with a multimeter.

[–] [email protected] 0 points 1 week ago (2 children)

You mean parallel right

[–] [email protected] 3 points 1 week ago* (last edited 1 week ago) (1 children)

Parallel won't show current load of a device. Even a clamp type can be thought of as serial, it's just picking up the EM field instead of actually carrying the current load across the device.

Something in parallel will be powered by the same source, with it's current load independent of the other device.

(And yes, I had to think about it for a second, it's not always immediately intuitive for me either.)

[–] [email protected] 2 points 1 week ago

Pfff current I was brain-dead, yes.

There's smart plugs that measure current, I have some Emporia plugs at home.

[–] [email protected] 2 points 1 week ago (1 children)

Series is more accurate.

[–] [email protected] 1 points 1 week ago

Voltage is measured in parallel and current in series. You need both to calculate the power.