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 AC amps on DC with an inverter

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salmonella Posted - 01/31/2011 : 2:13:42 PM
I searched the archive and did not find any info. on this but sorry if this is a repeat question.
Does anyone here run an AC amp off of 12Volts (as in a car battery) using an inverter? If so, does the quality of the inverter matter to avoid hum or distortion?
I am considering a setup like this for my 60 watt acoustic amp and was wondering if there was any experience with this out there in TP land.
thanks
Dave
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slipry1 Posted - 02/01/2011 : 4:25:10 PM
quote:
Originally posted by salmonella

thanks for the input on inverter noise. I will check on that.
Is power in volt-amps different than power consumption in Watts?
The manf spec sheet says power consumption min 42 watts max 100 watts and this is way less than even the smallest inverters. At 12 Volts it doesn't draw many amps (4 to 8 approx with some inefficiency in the inverter) either so the battery, even a small one, should last a long time.
Did I do this calculation correctly or is there a spec I am missing?
Dave

One watt is one volt-amp. There are other definitions, but this will tell you what load the inverter can take. For instance, a 30 Watt Amplifier running at 110 VAC is drawing approximately 280 milliamps of current, while your 42 watter draws approximately 380 milliamps, and so on. The increase in current to 4 amps is due to ineffiency in the inverter, resulting in heat. The measurement is independent of time.
salmonella Posted - 02/01/2011 : 2:10:39 PM
thanks for the input on inverter noise. I will check on that.
Is power in volt-amps different than power consumption in Watts?
The manf spec sheet says power consumption min 42 watts max 100 watts and this is way less than even the smallest inverters. At 12 Volts it doesn't draw many amps (4 to 8 approx with some inefficiency in the inverter) either so the battery, even a small one, should last a long time.
Did I do this calculation correctly or is there a spec I am missing?
Dave
slipry1 Posted - 02/01/2011 : 08:22:30 AM
Inverters can be a major source of noise, especially the digital kind, where the 60 Hz is created by switching. Good ones have roll off filters to minimize the effect. Don't forget the amount of power (volt-amps) that the amplifier requires. You have to check the manufacturer's specs. Good luck,
-slipry1 da EE.

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