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Old 27th July 2005, 12:27 PM   #1
raszvan is offline raszvan  Russian Federation
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Join Date: Apr 2005
Location: bucharest
Default the car to power a home use amp

the ups use a 12v yor car u have 12v if u connect the ups to the car batery u have a cheep convertor...i't works...i used it to power up am 120W @ 8Ohm amplifier (home use)..
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Old 28th July 2005, 01:11 AM   #2
clem_o is offline clem_o  Philippines
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Join Date: Jun 2005
Location: Manila
Yes, it does work, but you'll have to make sure that the power transformer of your 'home amplifier' will not have problems (if continuously on for a loooong time) with the square-wave output of the UPS (most of the UPS units anyway).
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Old 28th July 2005, 08:08 AM   #3
bawang is offline bawang  Malaysia
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Join Date: Oct 2001
Location: Malaysia
Tried this method with fan motors, it hums...... Due to cost savings, most UPS manufacturers omitted the output filtering/wave shaping devices at the output. Contains lots of 3rd order harmonics.....
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Old 28th July 2005, 11:21 AM   #4
clem_o is offline clem_o  Philippines
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Join Date: Jun 2005
Location: Manila
Actually, it contains 3rd, 5th, 7th, 9th etc harmonics!

Manufacturers never removed the harmonics simply because the UPS is designed to power up computer systems which use switchmode power supplies (which generally don't care if the input is sine or step-sine or square). Trying to use a UPS to power up any inductive load for extended periods of time is probably asking for trouble (or a smoked transformer... :-) )

Don't get me wrong though - there are some UPS' that do in fact produce true sine-wave output - but these are significantly more expensive than the 'usual' stuff. I used to have a UPS manufactured by TI - it produced a really clean sine wave, but went dead some months ago.. sad...
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