We’ve tried several times to explain the difference between the different type of UPS but it just gets too technical with diagrams and really boring text.
What we need is a demonstration, where you can see the effect of each of the different types of UPS. OK simple, what you need is an oscilloscope, some decoupling device, a variac, a multimeter. Oh, and of course one of each type of UPS.
Or you can have a look at this flash file on UPS operation. It’s cool!
UPS Operation Screenshot
If you’ve been caught out with the latest price increases from APC, why not take a look at the high value systems you can get here at UPSMart? We keep our costs low so we can provide power protection products at the best possible prices to you.
Lately we’ve been supplying a number of projects with alternatives to APC due to a recent price hike that has caused project budget problems. Take the APC SUM3000RMXLI2U, a 3KVA 2U rackmount line interactive product. On APC’s site at £1425. You can probably pick this up from a dealer at around £1100 – £1200. Compare this with the Powerware 5130 3KVA 2U Rackmount UPS, you can buy this here at under £610. Almost half the price.
And this is not from some manufacturer you haven’t heard of, its one of the worlds best – Powerware.
Why not look at what else we can do?
Remember, times are tough, don’t skimp on power protection – change your provider!
I had a query this morning, somebody unsure whether or not he should use a square wave system. Well, what are the advantages and disadvantages of this type of system?
There is only one advantage – price. A square wave system is the cheapest to produce. It requires the fewest, and cheapest components available.
When I first became involved with UPS I was astonished that square wave UPS even existed. I thought a UPS provides power when the lights go out – right? My assumption was that the power it would deliver would be equivalent, if not better than the power that was originally present. After all, as an educated electrical engineer, I knew that the mains power was a 50Hz sinewave waveform, so you would assume that a device that simulated the mains power would generate exactly the same? How wrong this assumption is. A square wave is a nasty waveform, in effect bombarding your equipment with a high frequency transient (the leading edge of the squarewave) of a voltage up to 300V 50 or 100 times per second. These transients have a damaging effect on all electrical circuitry.
So why use them?
Well, as power cuts are usually infrequent, the damaging effect of the UPS is limited. In addition, a typical PC will have a Switched Mode Power Supply (SMPS) that will appear to work fine with a square wave input. So for a home PC, for protection against infrequent power cuts, and only to prevent annoyance, rather than any critical data, a square wave system provides a cost-effective power protection solution.
A square wave system has its place, but only for non critical applications, and only for protection against infrequent short term power cuts, and then again, only for systems that have a SMPS. For anything other than this, you need to look at sinewave systems.
We have a number of OPTI-UPS products currently on sale with upto 40% off. We’ve got the Enhanced Series (ES) range for your basic PC protection and a few of the highly regarded sinewave PS Series products.
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