UPS questions

[Imago]

I hope it's the right section for this...

I have a couple of questions and I hope someone could help me finding the answers.

The first is: the VA value of an UPS is 1 to 1 to the wattage or there is some kind of conversion to do? I'll explain better, if an UPS has 800VA it can keep up a PC with a 600 watt PSU rendering for at least one minute? Online I see some that says "VA=Watt" but my UPS is 800VA and clains to keep max 480Watt...
The second: the UPS is damaged if I unplug it every night from the city power net? I mean unplugging the power UPS' power cord from the wall socket, in order to avoid it absorb electricity for no reason. I know I can turn it off but I wonder if it can be damaed if unplugged from the wall as well.

[TrigrH]

8 minutes ago, Imago said:

The first is: the VA value of an UPS is 1 to 1 to the wattage

No, you need to see the wattage rating of the UPS you have.

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my UPS is 800VA and clains to keep max 480Watt...

Then its 480w.

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will the UPS get damaged if I unplug it every night from the city power net?

No - if you switch it off BEFORE unplugging it.

If you are draining it every night, you will wear it out.

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in order to avoid it absorb electricity for no reason

This is a dumb reason to unplug a UPS every night. They only pull a small amount of power to keep the batteries at 100%.

[Poinkachu]

3 hours ago, Imago said:

I hope it's the right section for this...

I have a couple of questions and I hope someone could help me finding the answers.

The first is: the VA value of an UPS is 1 to 1 to the wattage or there is some kind of conversion to do? I'll explain better, if an UPS has 800VA it can keep up a PC with a 600 watt PSU rendering for at least one minute? Online I see some that says "VA=Watt" but my UPS is 800VA and clains to keep max 480Watt...
The second: the UPS is damaged if I unplug it every night from the city power net? I mean unplugging the power UPS' power cord from the wall socket, in order to avoid it absorb electricity for no reason. I know I can turn it off but I wonder if it can be damaed if unplugged from the wall as well.

It probably help if you tell people your UPS name and model.
Since they usually specify their power factor on their specification page.
Example : Mine is Prolink 1201 SFCU, 1200va the brochure page says it's power factor is up to 0,7.
When I see/hear "up to" i consider it to never reach that amount, so I'm just gonna say 0,6

So in simplest form :  VA x PF = W,  1200 x 0,6 = 720

I usually reduce it again by 5%, because I'm a paranoid and skeptical bumhole.

As for your PC power usage, it's better to properly calculate the actual power usage rather than just using your PSU max power.
Although doing this gonna need a watt meter (It's cheap & useful). Plug it to wall socket, then plug your PC power to it, render using your PC, monitor how many watt your PC uses in average while rendering.

Well, unless price is not an issue and you want to get as much juice as possible.

You can unplug it, the question is how reliable you want your UPS to be, and how much trouble you're willing to undergo. 
Since IIRC, Batteries lose charge overtime even when not used. How much depends on what type of battery.
It'd be quite funny if one day you plug your UPS a blackout happens but your UPS don't have enough power.

[Imago]

Thanks for the answers.

My model is a Legrand Keor 800.

My "power grid" is this: There's a multisocket with a general switch plugged into the wall,then the UPS is connected to that and all my devices are connected to the UPS itself.

At night I thurn off all my devices and my pc, turn off the UPS and then I switch off the main switch of the multisocket disconnetcing the UPS from the power. In the morning I turn on the multisocket, then I turn on the UPS and finally my PC and devices. These procedures might damage the batteries?

As far as I know, they are sealed lead batteries.

[Imago]

thanks again for the anwers.

The ups is the only thing plugged to the multisocket, I use it only for the switch. everything else is plugged to the UPS so there should be no issues there.

There are the PC and two monitors, small devices are powered by the PC.