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is this UPS good enough ? - Page 2

post #11 of 35
Yes, it is very likely you will face the same problem. Both UPSes you have linked use square wave, which is even worst than stepped sine wave.

square_modified_sinewave.jpg

Green one is square wave. Blue one is stepped sine wave. Red one is pure sine wave. You want pure sine wave.
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post #12 of 35
Thread Starter 
thanks dear, I also found this one, it's more expensive, but I would like to ask about it.


http://cec.sy/products/product-13526.html

Nippotec APS PIC-1000 INVERTER CHARGER - 1000W- MODIFIED SINE WAVE

unfortunately, I couldn't find information about it on Google, or even see it's brand name at least !!
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post #13 of 35
Quote:
Originally Posted by the magical me View Post

thanks dear, I also found this one, it's more expensive, but I would like to ask about it.
http://cec.sy/products/product-13526.html
Nippotec APS PIC-1000 INVERTER CHARGER - 1000W- MODIFIED SINE WAVE
unfortunately, I couldn't find information about it on Google, or even see it's brand name at least !!

That is not a UPS I'm afraid. Inverter is for a different purpose.
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post #14 of 35
Probably the problem of shutting down is that your ups is Line Interactive.
What I think happens is that when the power cuts out the ups needs some time (millisecs) to turn from line to battery.
When your pc isn't using much power, your psu might be able to power your pc these millisecs due to discharging capacitors, until the ups switches to battery power.
With gaming and higher power usage you have less time and your pc shuts down before the ups changes to battery.
The 2nd ups is again Line Interactive and you might have the same problem.
I would recommend an online ups, which don't have any switching time.

Had the same problems like you with my older line interactive ups.
Currently I am using 2 online ups 2kva/1400w (made in China) that cost me around 250€ each.
The only bad thing about them is the constant running loud fans.
Edited by TonyGrunt - 4/21/12 at 1:52pm
post #15 of 35
Quote:
Originally Posted by TonyGrunt View Post

Probably the problem of shutting down is that your ups is Line Interactive.
What I think happens is that when the power cuts out the ups needs some time (millisecs) to turn from line to battery.
When your pc isn't using much power, your psu might be able to power your pc these millisecs due to discharging capacitors, until the ups switches to battery power.
With gaming and higher power usage you have less time and your pc shuts down before the ups changes to battery.
The 2nd ups is again Line Interactive and you might have the same problem.
I would recommend an online ups, which don't have any switching time.
Had the same problems like you with my older line interactive ups.
Currently I am using 2 online ups 2kva/1400w (made in China) that cost me around 250€ each.
The only bad thing about them is the constant running loud fans.

Topology does not matter in this case. Line interactive UPS is a good one. 8 ms transfer time is not too slow either. Only when we are talking about 16 ms or more then it is a problem.

A online UPS is more expensive, and usually only seen on server grade UPS.
Edited by trumpet-205 - 4/21/12 at 2:02pm
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post #16 of 35
Quote:
Originally Posted by trumpet-205 View Post

Topology does not matter in this case. Line interactive UPS is a good one. 8 ms transfer time is not too slow either. Only when we are talking about 16 ms or more then it is a problem.
A online UPS is more expensive, and usually only seen on server grade UPS.
I don't think any pc can run without power for 8 ms. This time must be powered by all the discharging caps of the psu and the mb.
You get what you pay and you probably see online ups on servers because they don't want to have the problems the OP has.
I am pretty sure with an online ups no shutdown will happen as you are always get power from the inverter and not switching between avr voltage or inverter voltage.
post #17 of 35
Thread Starter 
well, do you think this applies to video encoding and heavy Photoshop processing ??

I mean do you think I may face the same think in case I was doing some video encoding / Photoshop rendering, and then get instant restart if I have a power-cut ??
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my humble epic
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post #18 of 35
Quote:
Originally Posted by TonyGrunt View Post

I don't think any pc can run without power for 8 ms. This time must be powered by all the discharging caps of the psu and the mb.
You get what you pay and you probably see online ups on servers because they don't want to have the problems the OP has.
I am pretty sure with an online ups no shutdown will happen as you are always get power from the inverter and not switching between avr voltage or inverter voltage.

Actually most PSU have hold up time from 10 ms to 30 ms, so a transfer time of 8 ms is definitely enough for most PSU.

Online UPS has no transfer time because power always goes through inverter. AC to DC back to AC. Downside is much lower efficiency, typically 87 to 90%, versus up to 97% on line interactive topology.

@OP, anytime you do something intensive your PC draws more power.
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post #19 of 35
Thread Starter 
dammit !! I just feel like I have had no benefits from getting this UPS, or even any main-stream UPS !! mad.gif


or I should go for those insanely expensive ones ?? LOL... I may work as a belly-dancer to afford a one I think !!
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my humble epic
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post #20 of 35
Quote:
Originally Posted by the magical me View Post

dammit !! I just feel like I have had no benefits from getting this UPS, or even any main-stream UPS !! mad.gif
or I should go for those insanely expensive ones ?? LOL... I may work as a belly-dancer to afford a one I think !!

I don't know how the sanction works over there, but would it be possible to have a friend bring in a UPS instead?

@TonyGrunt

I took more time in digging. Turns out in ATX specification a PSU needs to be able to handle zero volt 1 full cycle of 60 Hz, meaning a hold up time of 16.6 ms. So at full load assuming the PSU does indeed conform to specification, minimum hold up time is 16.6 ms. OP is using a quality PSU, and probably pulls half of 800 W. Transfer time is non-issue here.

http://www.peakpower.org/antecea500dpg7.htm
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