need UPS which brand??

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asingh

asingh

Aspiring Novelist
maverick786us said:
Great. From where you purchased it? I purchased an 800VA for 5200 last year september

Pretty strange its still costing 5400 in TheItWares

*www.theitwares.com/ups/ups.htm
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This is the one I got. I got it from a shop in Nehru Place. Can get you the exact name once I get back home.

tarey_g said:
What is the product code or full name for the APC 650VA UPS ? 650 fits in my budget. Does 800 one have anything special other than extended backup?
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This is the link for the 650VA.

This is the link for the 800VA. And this too.

When getting a UPS make sure you check the max throughput WATT support (efficiency) it gives.

1100VA:660W
800VA: 500W
650VA: 390W

The rule of thumb to calculate efficiency is ~60% of the VA rating. VA is volts into amps which equals WATTS. P = VA. So we may ask, if the UPS is rated at 1100VA why cannot the UPS support 1100W of equipment. Reason being energy conversion. There will be a loss of energy (and in our case ~ 40%). All electronic components have a resistance, which cause the loss in energy --- where does that energy go...well we 'feel' it as heat. The UPS getting hot...!

Basically when planning the UPS:

1. Max system requirement during load: MaxRequired
2. Max UPS efficiency watt output: UPSOutput
3. UpsOutput = MaxRequired + 30% of MaxRequied

This way you will be future scaled..
 
Skud

Skud

Super Moderator
Staff member
ashu888ashu888 said:
@ skud:

if ur PSU is an ACTIVE PFC type, then u shud get "SMART UPS" (pure sine wave UPS, correct for Active PFC PSUes) labelled UPS from APC and NOT "BACK UPS" (its stepped/modified sine wave UPS and a big no no for Active PFC PSU, if u are looking for a pure sine wave)
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my psu is cooler master RS-600-PCAR-E3 (or may be 650, can't remember properly). don't know if it's an active pfc type or not. plz comment.
 
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A

acewin

Point Blanc
@asigh, what is the running time for the backup UPS u got the 1100VA one,
my dad had bought this intex UPS for home and it is giving quiet a trouble now, it certainly would be quiet old too 2 years or so, not sure. if it gives me 30 mins of time it will be quiet good
config is
Bestec 300W PSU(70% performance)(not able to do anymore upgrades of HDD or gfx card due to this PSU, so just waiting for time to buy new PC)
Pentium D 820
2 SATA HDDs
DVD Burner

Beside these I run my ADSL router too attached in, in short long run time will be useful, as here in bangalore electricity is cut 2-3 times daily at fixed timings.
 
E

eureca_eureca

In the zone
Using apc my self for 6 yrs now , only battery change so far , and need no drivers to get connected to pc (win based)

Only APC please , Help line ROCKS
 
asingh

asingh

Aspiring Novelist
acewin said:
@asigh, what is the running time for the backup UPS u got the 1100VA one,
my dad had bought this intex UPS for home and it is giving quiet a trouble now, it certainly would be quiet old too 2 years or so, not sure. if it gives me 30 mins of time it will be quiet good
config is
Bestec 300W PSU(70% performance)(not able to do anymore upgrades of HDD or gfx card due to this PSU, so just waiting for time to buy new PC)
Pentium D 820
2 SATA HDDs
DVD Burner

Beside these I run my ADSL router too attached in, in short long run time will be useful, as here in bangalore electricity is cut 2-3 times daily at fixed timings.
Click to expand...

Backup:
LOAD : 5-6 mins.
IDLE : 18-20 mins.

Max Throughput: ~660W
 
ashu888ashu888

ashu888ashu888

Core i7 (nehalem) Owner
^^

for better wefficiency and back up time, the VA rating of the UPS (60%) shud corellate to the wattage of the PSU..

since u hv a 600W PSU, and a 500VA UPS, so 500VA x 60% (i.e 500 X 0.6 = 300W) and ur PSU is 600 W so therefore the reduced back up time.. :)
 
reniarahim1

reniarahim1

Youngling
My UPS is also gone and I have decided to go for a new APC One. I would be connecting 19" Dell LCD , CPU(P4+845 Motherboard+Hard Disk+DVD Writer) and Broadband Modem to the UPS. Will a 500VA Will do Or Do i need to go for 650 VA one?
Wats the current cost of APC ES 500VA and APC ES 650VA?
 
asingh

asingh

Aspiring Novelist
Guys..if you read..here it is for APC: (its mentioned a couple of posts above)

1100VA:660W
800VA: 500W
650VA: 390W


Also as desibond has mentioned...throughput is ~60% of rated VA.

As for calculating Wattage Requirement:

Approximate figures would be: (LOAD)
Monitor : 30W (irrespective of load/idle)
Intell 45nm processor: 65W. Intel details can be sought here. You can directly type your model (example E7400) in the search bar, and get the Wattage).
RAM: 10-12W per module.
HDD: 12-15W per disc.
GPU: Depends -- check the review websites. Make sure sure you get the power draw 'only' for the GPU -- and not the whole system, it would obviously be different to your own setup. This is a major factor when deciding Power Requirements. High end cards (4870, 4890 GTX 275, GTX 285, in fact even nVidia GS series, HD4850 series require a lot of power at load).

Note for SLI/X-Fire:
Be extremelly careful, when buying PSU/UPS. With a 'normal' setup you can "live on the edge", meaning--you can have a UPS which matches exactly the PSU requirements and be safe. With multi-GPU it becomes really dynamic, cause the cards cause a lot of variation in system power pull. At times one is scaling, or both will...very sensitive.

Calculate your Wattage (on the upper limit -- meaning take the upper limit if you got to approximagte add 30% to the number you get). That should be your UPS requirement.

Also this is a good tool -- to get the ballpark figure.

Or another way to calulate it --- much simpler.

UPS = PSU Rating + 30% of PSU Rating.

Backup is usually 5-6 minutes under load and 15-20 minutes idle. Both these numbers come down, depending how close you are the the UPS throughput.
 
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