Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Log in / Join
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Help
Wiring, Electrical & Installation
alternator question...
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="CarAudioAddict" data-source="post: 109912" data-attributes="member: 545743"><p>To find out the amperage draw on an amplifier takes its output power (RMS for average draw and total for max draw) and devide by 12. This will give a reading assuming the amp was 100% efficient. Now you have to consider that class AB amps are only about 60% efficient and class Dare about 80%. Divide the number of amps you got from the last equation by the efficiency of the amp and you should end up with a fairly accurate number.</p><p></p><p>so, amperage draw equation:</p><p></p><p>( output power / 12 ) / effeciency = amperage draw</p><p></p><p>example using a 1000 wattt class AB amplifier @ 60% efficiency</p><p></p><p>( 1000 / 12 ) / 60% = ( 83.333 ) / 60% = 138.9 Amps</p></blockquote><p></p>
[QUOTE="CarAudioAddict, post: 109912, member: 545743"] To find out the amperage draw on an amplifier takes its output power (RMS for average draw and total for max draw) and devide by 12. This will give a reading assuming the amp was 100% efficient. Now you have to consider that class AB amps are only about 60% efficient and class Dare about 80%. Divide the number of amps you got from the last equation by the efficiency of the amp and you should end up with a fairly accurate number. so, amperage draw equation: ( output power / 12 ) / effeciency = amperage draw example using a 1000 wattt class AB amplifier @ 60% efficiency ( 1000 / 12 ) / 60% = ( 83.333 ) / 60% = 138.9 Amps [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
alternator question...
Top
Menu
Home
Refresh