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Calling people with UPS (power supply, not shipping company) experience

So I'm going to be getting a new desktop PC soon I think, and I was thinking about using my UPS with it. This hasn't been a big concern to me before because my current PC is a laptop that has its own battery in the case of a power blip. But I have no experience with UPSs and was hoping to get a few concerns addressed by someone on here who hopefully does.

So, the UPS. It's a CyberPower 550VA that I got second-hand at a yard sale for $3. Not really concerned about it being exposed to the elements as it was in the person's garage rather than outside, and it looks brand new to the point where the red sticker over two of the surge-protected outlets is still there.

First concern: everything I plug into it buzzes when powered by the battery. Fans, lights, chargers, etc., and seems to run at slightly less of a voltage than 110 (light is slightly dimmer, fan is slightly slower). I'm not overloading it - I'm plugging in only one of these at a time. Is this normal, and is this safe for a PC, monitors, and an external hard drive? These are the devices I plan to plug into the battery-enabled slots.

Second concern: When I was testing the battery with the fan, I noticed the fan gets gradually slower, which I'm assuming means it's getting gradually less and less voltage supplied to it, rather than the UPS supplying max capable voltage to it then instantly cutting power when it can no longer handle max voltage. Same question as above: is this normal and safe for the devices?

Third concern: When I plug it in it gets noticeably warm, on or off. Not hot where it smells or will burn me, just warm. Normal?

Fourth concern: It only has a 16 AWG cord and a 10A circuit breaker. I would need to use all 8 outlets on this for the 4 devices I mentioned above, plus a Wii U, projector, DVD recorder, and cable box in the 4 surge-protected-only outlets. Can a 16 AWG cord safely handle all this? Most power strips and surge protectors I see have a 14 AWG cord capable of handling 15A; not sure why a UPS wouldn't.

The more I sit here and type all this the more I realize that this is probably not worth the trouble at all and I should just continue using the Newpoint 14 AWG surge protector I'm using now, especially considering I rarely EVER get surges or blackouts here. But these are still questions I have anyway in case I'm in the market for UPSs in the future.

Just a note that I did hook the UPS up to my PC with USB and used the software with it. The software said everything was running correctly and there were no problems.
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First concern: everything I plug into it buzzes when powered by the battery. Fans, lights, chargers, etc., and seems to run at slightly less of a voltage than 110 (light is slightly dimmer, fan is slightly slower). I'm not overloading it - I'm plugging in only one of these at a time. Is this normal, and is this safe for a PC, monitors, and an external hard drive? These are the devices I plan to plug into the battery-enabled slots.

Everything you plug into it ... buzzes? Including things that aren't capable of emitting sound, like "fans, lights, chargers", etc..? Then yeah, I'd say that there's definitely a serious problem here. Like, maybe that's a sign it's going to explode.

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Second concern: When I was testing the battery with the fan, I noticed the fan gets gradually slower, which I'm assuming means it's getting gradually less and less voltage supplied to it, rather than the UPS supplying max capable voltage to it then instantly cutting power when it can no longer handle max voltage. Same question as above: is this normal and safe for the devices?

This would only make sense if the UPS was defected, so no.

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Third concern: When I plug it in it gets noticeably warm, on or off. Not hot where it smells or will burn me, just warm. Normal?

Pretty much everything like that does, so personally I've say that's fine.

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Fourth concern: It only has a 16 AWG cord and a 10A circuit breaker. I would need to use all 8 outlets on this for the 4 devices I mentioned above, plus a Wii U, projector, DVD recorder, and cable box in the 4 surge-protected-only outlets. Can a 16 AWG cord safely handle all this? Most power strips and surge protectors I see have a 14 AWG cord capable of handling 15A; not sure why a UPS wouldn't.

Sounds like it would work to me. I mean, I would assume that it's common for UPSs to handle that much power anyway without too much issue... Does the packaging or whatever's left of it say anything about how many volts it's intended for on it?
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Well I'd assume it's intended for 110V, but I'm more concerned about the amps. 12A for a 16 AWG cord vs 15A for a 14 AWG cord. I feel like I'll be very close to making it trip if using all 8 outlets for electronic equipment. Guess I'll find out.
Come to think of it, this is probably worth mentioning:
Originally posted by Xyspade
So, the UPS. It's a CyberPower 550VA that I got second-hand at a yard sale for $3. Not really concerned about it being exposed to the elements as it was in the person's garage rather than outside, and it looks brand new to the point where the red sticker over two of the surge-protected outlets is still there.

You talk about how brand new it was, but uh... did you think about why would anyone sell a seemingly brand-new UPS at a yard sale for only three dollars? Kinda strikes me as the sort of thing someone would do if they knew it was defective/broken.

My personal suggestion (given your very worrisome concerns): Sell it again for TWO dollars this time. Or better yet; throw it away.

(sounds to me like you don't really need it anyway to be honest, why did you want to buy one in the first place if you're basically all set anyway with your laptop battery?)
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Originally posted by K.T.B.
why did you want to buy one in the first place if you're basically all set anyway with your laptop battery?
Very true. But it was worth $3 for me to take a chance and try a UPS out for myself and see how it works, rather than having to spend $80+ to do that. That's basically why I bought it.

Also, I think you missed the part about I'm getting a desktop soon, so I'll have more of a purpose for one.

Oh also, to confirm what you were saying above, yes, everything I plug into it buzzes. Pretty loudly too. But only while on the battery -- when running off wall current it's fine.