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What UPS

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stafil:
I have a single outlet in my home office, to which I connect a floor lamp, a PC, a monitor and a space heater. When the heater turns on I can see the lamp going dim for a second or so. I assume because it's the heater draws too much current. I am afraid that this may affect the PC and Monitor and was thinking about getting a UPS for them. Question is, I am not sure if I need an online ups or if a line-interactive will be good enough. Thanks!

tooki:
Your PC and monitor do not care. In all likelihood, they're specified to work on 100-240V, and it's unlikely your 120V is sagging all the way to 100V. 100V is the voltage used in Japan. And that 100V is just the nominal value: it's actually 100V ±10%, so as low as 90V. (This is why some power supplies even state 90V as their minimum.) If your 120V is sagging to 90V, you'd have to have massive problems in your electrical system.

Anyhow, due to how switching power supplies work, many of them work well below their rated voltage. (And on DC, too, since the first step is to rectify.) As an example, the Rigol DS1000Z series oscilloscopes are known to work on 48V DC, far below their rated AC input voltage.

If you get a UPS, get one if your power is unreliable and you have frequent blackouts or serious brownouts. Otherwise, don't bother.

JustMeHere:
Tripp Lite.  All desktops should be hooked up to a UPS.  It helps protect data in the disk drives. With moden SSDs it might not be as big of an advantage.  If the computer knows it's on battery it will use RAM to cache disk writes.

tooki:

--- Quote from: JustMeHere on December 06, 2022, 02:04:13 am ---Tripp Lite.  All desktops should be hooked up to a UPS.  It helps protect data in the disk drives. With moden SSDs it might not be as big of an advantage.  If the computer knows it's on battery it will use RAM to cache disk writes.

--- End quote ---
Hard disks have write buffers, and if power is lost unexpectedly, they actually use the rotational energy in the platters, running the motor as a generator, to finish writing the buffer to disk.

Obviously this won’t help on long writes, but I really don’t think a UPS is essential for most purposes anymore. Journaled file systems long ago eliminated the worst issues with improperly shut down systems.

Jeroen3:
Is it on old incandescent of fluorescent lamp that it is changing brightness on voltage?
When you pull max current on a circuit you can expect several volts of drop. This is normal.
What you should worry about is thermally tripping the overload circuit breaker, ,that turns off your pc!

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