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12 V Power

machineman

Oct 7, 2012
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Oct 7, 2012
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I have a digital video recorder that currently uses a 110 V AC power supply that outputs 12 volts DC @ 3 amps. I would like to power this device from a 12 V car battery. Can this be done ? If so, how, and how long can I expect it to operate under the battery power?
 

duke37

Jan 9, 2011
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If you have a battery with a capacity of 10Ahr and you draw 3A then the time is about 3 hours.
If you are drawing 2A and have a 40Ahr battery, then the time is 20 hours.
 

machineman

Oct 7, 2012
3
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Oct 7, 2012
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Thank you very much. That is very helpful. I certainly appreciate it. Do I need to regulate the incoming power ?
 

davenn

Moderator
Sep 5, 2009
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.......... Do I need to regulate the incoming power ?

that really depends on how much variation the DVR can tolerate from the 12V
A fully charged battery could be as high as 13.5 - 14V
Is the currently used plugpack supply regulated ?
it should be marked regulated or unregulated


Dave
 
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