I did a search on AVS forum about UPS and projectors, but was unable to find a clear and definitive answer to my question. I know that Uninterruptible Power Supplies tend to produce a lesser quality current when using their batteries, outputting a stepped or simulated sine wave instead of a true sine wave. Some UPS generate a true sine wave, which obviously seem better.

I know that when running on batteries, a pure sine wave is desirable, but not mandatory. I mean, the UPS will only be running on its batteries for a few minutes once in a while, giving the PJ time to cool down the lamp in case of a power failure. Will the simulated sine wave harm the PJ in anyway? probably not.

But WILL THE UPS DETERIORATE CURRENT AND IMAGE QUALITY EVEN WHEN ON STAND BY? will it alter the output sine wave in any noticeable way when the batteries are fully charged and not in use? does the electrical current simply pass through the UPS untouched? I've read confusing and conflicting information about those questions. Anyone knows the answer?

A non true sinewave damages every sensitive electronic component. I depend on a true sinewave since most my electronics are on my solar circuit. Spend the extra money and make sure it is really rated for your projector. I pretty much max out my 300 watt inverter on the startup. If there is any sign of outage, I surely do not turn the projector on.

A step approximated sine wave is not the be all end all. If you can afford a true sine wave UPS then thats great. If not any kind of UPS is better than none at all for any kind of projection (being it front or rear). Most power supplies in todays equipment can handle most small power anomolies, which are thousands of times greater than any step approximation. Usually, the AC input is turned into DC anyway if it is a switch mode power supply which most equipment has so it's usually worked out there. Your bigger troubles are filtering out noise and any other power disturbances so conditioning that power is the biggest thing. If you go to the APC website, www.apcc.com, you can read through some of there white papers. Check out there J type (step approximated) and S type (pure sinewave) UPS systems for HT. Write them the same question and they can probably point you to the white paper. For strictly there AV stuff go to www.apcav.com

I have tried the Double Conversion Online UPS(APC SURT2000UXI) and Furman IT REF 16E(Symmetrically Balanced Isolation Transformer) connected to my HT Front Ends. The Better was Furman Setup, it gave better PQ, Brighter Image,Vivid Color and Less Noise. However the APC setup was not bad when compared to Ordinary Current. The APC did remove noise and provide protection against outages(severe in my country). Stepped Up approximated Sinewave UPS is a Total NO NO. It produced a flickering sound in my High End Computer Power Supply (Cooler Master 850W Power Supply Unit) so I never tried connecting the UPS to My Projector.

due to the load you're likely to be putting on the UPS I would likely go with a UPS being run from 3-phase with output to single phase with connection uec type connector or standard ac connector...

if your current power system doesn't support a 3-phase you may require a sparky to come in and do the wiring..

I doubt you would get an honest answer from ups vendors on domestic single phase UPS's, you will need to look at the industrial sector for answers..

due to the load you're likely to be putting on the UPS I would likely go with a UPS being run from 3-phase with output to single phase with connection uec type connector or standard ac connector...

if your current power system doesn't support a 3-phase you may require a sparky to come in and do the wiring..

I doubt you would get an honest answer from ups vendors on domestic single phase UPS's, you will need to look at the industrial sector for answers..

Three phase power in a home is very, very rare. And it's no small feat to add either. First the area must have three phase service. Many rural residential areas don't. Next the pole transformer will have to be replaced or agumented with two more for a true 3 phase service. The line from the pole or street vault will have to be replaced along with the meter and the whole house breaker panel. Most utilities will not allow a single phase panel to be tapped off a three phase service as it causes a load imbalance.

Or you can buy rotary converters that ahve a single phase motor running a three phase generator - expensive. Don't bother with the power tool solid state converters as they are not true three phase.

No, you don't need three phase service for an HT, not even one like mine. A good stepped sinewave unit will work fine for emergency use. That is to power down the equipment not run it during a power outage.

if you run a bore chances are you're using a 3-phase system for that particular device, though it's not common in the home with the amount of devices you plan to run off the UPS you may want to look at 1...

These threads are such gibberish.


Just feel free to post links to the exact products you are referring to ;)

have a chat a apc directly, they should be able to tell you whether or not the UPS is right for your application you're planning to use it for.

chances are they are likely to tell you the same thing that i've told you, due to the powerload your going to put on the unit the domestic high end/low end industry isn't going to be enough on single phase gear, you'll be looking at medium to high end gear run off a 3-phase circuit..

I know many professionals who install UPS's in their residential projection systems, and I will guarantee you that none of them use a 3-phase circuit.

CJ

have a chat a apc directly, they should be able to tell you whether or not the UPS is right for your application you're planning to use it for.

chances are they are likely to tell you the same thing that i've told you, due to the powerload your going to put on the unit the domestic high end/low end industry isn't going to be enough on single phase gear, you'll be looking at medium to high end gear run off a 3-phase circuit..


What equipment is he running? It doesn't say. My HT which contains 4 racks of equipment runs on less than 5KVA. Single phase UPS systems can be had to at least 5KVA. They may need 240v input but this is available in most homes.

Are you in the USA? I ask because three phase power to residences may be commen elsewhere but not in the USA.

The Better was Furman Setup, it gave better PQ, Brighter Image,Vivid Color and Less Noise.

Wait, wait, before you even think about getting a high quality UPS with ultra-pure sinusoidal wave form make sure you are using these (http://www.cherubini.com/en/product/5857/Nordost-odin-supreme-reference.-3-mt.asp) in your system. Other wise you're just wasting your money.

wait, wait, before you even think about getting a high quality ups with ultra-pure sinusoidal wave form make sure you are using these (http://www.cherubini.com/en/product/5857/nordost-odin-supreme-reference.-3-mt.asp) in your system. Other wise you're just wasting your money.

:d:d

^^ OMG :eek:

To think people actually buy that kinda thing

Is that computer ribbon cable? I think it is. You know, that same stuff that goes from your motherboard to your floppy drive?

What a scam!!!