UPS...in the car to power a home use amp

raszvan · 27th July 2005, 12:27 PM

the ups use a 12v batery..in yor car u have 12v batery...so 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)..

clem_o · 28th July 2005, 01:11 AM

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).

bawang · 28th July 2005, 08:08 AM

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.....

clem_o · 28th July 2005, 11:21 AM

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...

27th July 2005, 12:27 PM	#1
raszvan diyAudio Member Join Date: Apr 2005 Location: bucharest	UPS...in the car to power a home use amp the ups use a 12v batery..in yor car u have 12v batery...so 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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28th July 2005, 01:11 AM	#2
clem_o diyAudio Member 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).

28th July 2005, 08:08 AM	#3
bawang diyAudio Member 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.....

28th July 2005, 11:21 AM	#4
clem_o diyAudio Member 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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