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80 Amp Alt enough?
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<blockquote data-quote="n2audio" data-source="post: 2370206" data-attributes="member: 540940"><p>I would think you might have figured out by now that it's not a yes or no answer.</p><p></p><p>It will run? Sure - and most likely run for a while. It may run fine for a long time, but it's possible your alt could be over-stressed and wear out in a matter of months, weeks...who knows.</p><p></p><p>Some people have run less and had problems, run more and had no problems at all. There are many variables.</p><p></p><p>Here's a guesstimation on the power demands...</p><p></p><p>80A alt -- general rule of thumb, 40% headroom. 80x.4 = 32A</p><p></p><p>Your amps -</p><p></p><p>1000w class D</p><p></p><p>300w class a/b</p><p></p><p>class d about 75% efficient -- 1000/.75 = 1333w demand at maximum test tone power.</p><p></p><p>1333/13.6 = 98A req'd -- 98/3 = 32A (music full volume)</p><p></p><p>class a/b = about 60% efficient -- 300/.6 = 500w demand at maximum test tone power.</p><p></p><p>500/13.6 = 37A req'd -- 37/3 = 12A</p><p></p><p>As a rough estimate you're looking at 45A at full power.</p><p></p><p>Do you listen at full power or more (clipping) all the time? Do you play a lot of bass-heavy music?</p><p></p><p>If those are both true there could be trouble.</p><p></p><p>What it comes down to is -- install it right. See how it works. It might be fine. If it's not, make improvements.</p></blockquote><p></p>
[QUOTE="n2audio, post: 2370206, member: 540940"] I would think you might have figured out by now that it's not a yes or no answer. It will run? Sure - and most likely run for a while. It may run fine for a long time, but it's possible your alt could be over-stressed and wear out in a matter of months, weeks...who knows. Some people have run less and had problems, run more and had no problems at all. There are many variables. Here's a guesstimation on the power demands... 80A alt -- general rule of thumb, 40% headroom. 80x.4 = 32A Your amps - 1000w class D 300w class a/b class d about 75% efficient -- 1000/.75 = 1333w demand at maximum test tone power. 1333/13.6 = 98A req'd -- 98/3 = 32A (music full volume) class a/b = about 60% efficient -- 300/.6 = 500w demand at maximum test tone power. 500/13.6 = 37A req'd -- 37/3 = 12A As a rough estimate you're looking at 45A at full power. Do you listen at full power or more (clipping) all the time? Do you play a lot of bass-heavy music? If those are both true there could be trouble. What it comes down to is -- install it right. See how it works. It might be fine. If it's not, make improvements. [/QUOTE]
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