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Need help choosing a UPS (plus general UPS tips)

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nstgc:
I was just making a suggestion. Besides if you have enough money to build a computer that regularly eats up 900W, chances are you can pay for two UPS and a dual PSU...thingy.

bork:
When you start push 1000W systems, you should look into running a dedicated 20A for it (if your running 120V.)  A normal 15A circuit should be limited to about 1300~1500 watts of continuous use.  If you are running two systems of this size, you are exceeding the limits of the power circuit.  A dedicated 20A circuit also uses a larger wire gauge that will have less of a power drop when pulling a heavy load across it which in turns puts less of a strain on the power supply.

If you are building a system with these large power draws, you are going out of whats is normal for a home PC.  You are entering into an area that requires a bit of planning to make sure you have the right power and cooling designed to support these things.  The support will cost just as much as the system itself; what ever the system cost you will need to double that price tag for the total cost.  One system you might get away with whats available but just ask anyone with two of these beast has went through to make it work.

Pentium100:
Not really, I have more than one PC and the total power consumption is 1.2 - 1.5kW. Room cooling is required (especially in summer) but it was not that expensive - I just used to use a big fan and an aluminium airduct (25cm diameter). Now I'm in a different room and want to make it better, so I bought a filter (the fan pulls a lot of dust from outside), some valves and will make a semi-permanent system, currently it is incomplete.

Still, I paid for the rack more than I paid for the cooling. Or the UPS. It is connected to one outlet (my country uses 230V). An electric kettle uses more power (2kW) than my whole system.

kitamesume:
^ replace that kettle with an induction type, imho at least theres units which uses less than 1KW, heh.

edit: wait, wouldnt more efficient PSUs be more preferred when you start pushing 1000W rigs? since even a difference of 5% is 50watts =o

Pentium100:

--- Quote from: kitamesume on June 05, 2012, 02:53:46 AM ---^ replace that kettle with an induction type, imho at least theres units which uses less than 1KW, heh.

edit: wait, wouldnt more efficient PSUs be more preferred when you start pushing 1000W rigs? since even a difference of 5% is 50watts =o

--- End quote ---
At 1kW it would take 8 minutes to boil 1.5L of water (assuming perfect heat transfer).

As for the efficiency - while 5% difference is 50W, it is still just 5%. However, more powerful PSUs are more efficient - if they weren't, they would melt since the ATX PSU form factor is too small or would require really powerful (and loud) fans. After all, a 60% efficient 1kW PSU would dissipate 670W as heat.

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