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#3
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![]() "sw" wrote in message . .. Do you think it's OK for a square wave inverter to feed a UPS that feeds a PC? I would really like to do that but was told by some one at APC it's a no no. My feeling was he had no idea and was just covering himself. Thanks Di second whats already been said here - you'd be fine. I have a small inverter that runs my notelbook, as well as a DC-DC converter for the same purpose. I cant remember which one is more efficient, but the DC-DC one i mainly use for flights and such because it can plug in on the plane. In the car, the inverter wins because it doesnt cause any interference with my stereo ;-) Shaun |
#4
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Shaun Van Poecke wrote:
"sw" wrote in message . .. Do you think it's OK for a square wave inverter to feed a UPS that feeds a PC? I would really like to do that but was told by some one at APC it's a no no. My feeling was he had no idea and was just covering himself. Thanks Di second whats already been said here - you'd be fine. I have a small inverter that runs my notelbook, as well as a DC-DC converter for the same purpose. I cant remember which one is more efficient, but the DC-DC one i mainly use for flights and such because it can plug in on the plane. In the car, the inverter wins because it doesnt cause any interference with my stereo ;-) Shaun I think some UPS's use a step-down transformer to get down to the battery voltage. A square wave inverter can wreak havoc with a transformer expecting 60 Hz AC. With a UPS, the PC is powered by 120 VAC that is generated from the battery voltage by an inverter. There is no problem powering a PC from an inverter, as Larry has made abundantly clear. There is very likely a problem powering a UPS from a square wave inverter. A sine wave inverter, OTOH, should cause no problems at all. Make sense? Good luck. Chuck ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#5
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#6
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![]() "Chuck Tribolet" wrote in message ... There's no excuse for using a square wave inverter these days. Modified sine wave inverters are cheap. sigh~ not everywhere in the world is as lucky as the USA ;-) here in australia we're still a bit backwards. small square wave inverters at 150watts start at $AU50, while something as exoting as a 1000watt square wave costs about AU$400. a sine wave 1000watt inverter costs about AU$800. Shaun |
#7
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"Shaun Van Poecke" wrote in news:TNtGh.6816
: a sine wave 1000watt inverter costs about AU$800 http://www.walmart.com/catalog/produ...uct_id=5301540 $118 for 1200 watts....sine wave output. Walmart ships worldwide. 1200 watts - 2400 watts surge if you have heavy enough wires to a big battery. Does Walmart charge that much in Australia? Hmm....$US118 = $AU151. They're still probably going to hit you up for some hefty import fees and VAT to pay for the socialized meds, etc. Should still be much cheaper than $AU800! Larry -- If the damned government isn't going to enforce immigration laws, can they at LEAST park an ICE paddy wagon in front of WalMart so I can find a parking place and make the checkout line SHORTER?! |
#8
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I didn't say true sine wave, I said modified sine wave.
I can't remember the last time I saw a square wave inverter for sale. With digital control, modified sine wave is ASMOP (A Simple Matter Of Programming). A square wave inverter goes to +120V (or whatever) for 1/120 second, then to -120V (or ...) for 1/120 second. A modified sine wave inverter goes to +120V for a bit less than 1/120 second, then to zero for a bit, then to -120V for a bit less than 1/120 second, then to zero for a bit. The net is that the area under the curve is the same as a sine wave. (Note: the above assume 60Hz. at 50Hz it would be 1/100 second). West Marine (they ship international) has a 700W continuous, 1800W surge modified sine wave inverter for US$69.99 As I said, no excuse for a square wave inverter these days. "Shaun Van Poecke" wrote in message ... "Chuck Tribolet" wrote in message ... There's no excuse for using a square wave inverter these days. Modified sine wave inverters are cheap. sigh~ not everywhere in the world is as lucky as the USA ;-) here in australia we're still a bit backwards. small square wave inverters at 150watts start at $AU50, while something as exoting as a 1000watt square wave costs about AU$400. a sine wave 1000watt inverter costs about AU$800. Shaun |
#9
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"sw" wrote in
: Do you think it's OK for a square wave inverter to feed a UPS that feeds a PC? I would really like to do that but was told by some one at APC it's a no no. My feeling was he had no idea and was just covering himself. Thanks If you sold UPS products to make your living, would you want them to use just any ol' cheap inverter....or your geewhiz technological wonder? There aren't any "square wave inverters" left on the market that I know of. Manufacturing inverters with sine wave synthesis is just too cheap and easy now. I just bought a 750 watt sinewave Black & Decker from WalMart for $70! It will even crank an 8000 Btu Samsung air conditioner with its 1500 watt surge rating. It has three 30A fuses in parallel. (No, you can't aircondition your boat on a boat battery....maybe a submarine battery.) It doesn't even turn its fan on until the load gets over 150 watts, it's so efficient. Driving my 1.6A fridge and a few loads on my workbench, it hardly gets warm. The fan in the inverter turns on and off as the fridge cycles...letting me know when the beer is cold. ALL of these little cheap inverters over the power input demand of the laptop will run the laptop just fine and charge its battery. Mine charges in the car from a 175W inverter that cost me $20 on sale. Your PC is no exception, either. It also uses a switching power supply that works perfectly with a very wide range of input voltages from DC to high frequency AC. It matters not as the input is a rectifier feeding a big storage capacitor the switchers use power from to create the output. Everything is converted to SMOOTH DC at about 170VDC off the AC line, whatever that line is. Many switching power supplies are rated from 90VAC to 270VAC input at any line frequency of whatever nation you happen to plug it into, so the manufacturer can send any computer to any customer, no matter where he/she lives. AS a note, I'm using a large APC UPS to power the computers in my office. It provides smooth power and automatically shuts down Windoze before the battery goes dead if the power outage is elongated. That's the reason I bought it, not for its perfectly-smooth, xtal-regulated 60 Hz at 120VAC. There was an "electrical noise" that lasted 8 seconds the last time it switched on to protect the equipment, probably caused by the beer fridge or electric heater running off the same outlet its plugged into coming on simultaneously...??? Larry -- If the damned government isn't going to enforce immigration laws, can they at LEAST park an ICE paddy wagon in front of WalMart so I can find a parking place and make the checkout line SHORTER?! |
#10
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Larry wrote:
"sw" wrote in : Do you think it's OK for a square wave inverter to feed a UPS that feeds a PC? I would really like to do that but was told by some one at APC it's a no no. My feeling was he had no idea and was just covering himself. Thanks If you sold UPS products to make your living, would you want them to use just any ol' cheap inverter....or your geewhiz technological wonder? There aren't any "square wave inverters" left on the market that I know of. Manufacturing inverters with sine wave synthesis is just too cheap and easy now. I just bought a 750 watt sinewave Black & Decker from WalMart for $70! It will even crank an 8000 Btu Samsung air conditioner with its 1500 watt surge rating. It has three 30A fuses in parallel. (No, you can't aircondition your boat on a boat battery....maybe a submarine battery.) It doesn't even turn its fan on until the load gets over 150 watts, it's so efficient. Driving my 1.6A fridge and a few loads on my workbench, it hardly gets warm. The fan in the inverter turns on and off as the fridge cycles...letting me know when the beer is cold. ALL of these little cheap inverters over the power input demand of the laptop will run the laptop just fine and charge its battery. Mine charges in the car from a 175W inverter that cost me $20 on sale. Your PC is no exception, either. It also uses a switching power supply that works perfectly with a very wide range of input voltages from DC to high frequency AC. It matters not as the input is a rectifier feeding a big storage capacitor the switchers use power from to create the output. Everything is converted to SMOOTH DC at about 170VDC off the AC line, whatever that line is. Many switching power supplies are rated from 90VAC to 270VAC input at any line frequency of whatever nation you happen to plug it into, so the manufacturer can send any computer to any customer, no matter where he/she lives. AS a note, I'm using a large APC UPS to power the computers in my office. It provides smooth power and automatically shuts down Windoze before the battery goes dead if the power outage is elongated. That's the reason I bought it, not for its perfectly-smooth, xtal-regulated 60 Hz at 120VAC. There was an "electrical noise" that lasted 8 seconds the last time it switched on to protect the equipment, probably caused by the beer fridge or electric heater running off the same outlet its plugged into coming on simultaneously...??? Larry I found that a Zantrex "modified sine wave", really a modified square wave inverter, would not run a Sears 115v input NiCad battery charger for a 19.2v drill until I built a low pass filter for the inverter. Dick, Nonsuch 26 |
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