Couple of questionabout alternator.How to figure amperage from wattage

[spnkysprky 10+ year member]

Ok,I have a couple of questions.Ok,Im a High voltage Electrician and In my line of work one way to find amperage (when giving at least 2 factors of the equation)is dividing the Total wattage by the volts...So I assume its the same in DC voltage....Then given these factors in my vehicle.I have a total of 1500watts im using(maybe less,Im doing worst scenario).Dividing that with 14.4Volts gives me a total of 104.2AMPS.

Is this the correct way to figure the amperage?

If so.....thenwill my factory (Dodge truck)136amp alternator be enough (I have the basic truck with no extras)to Supply my needs So long as I upgrade the big 3(wire size,Deep cycle battery maybe caps)....I think it will ,but are there other factors I should be aware of?

ADDED:I was thinking not all electrical systems would be exactly 14.4 volts...closer to 13.8 or less so maybe I should use a lower voltage for extra precautions?Another thing,that total RMS POWER

My amp is rated 63.014% Efficient...I added additional info to my question.1500 is the RMS.I was contemplating upgrading to a 160amp...do you really think I would need it?

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[kmanian 5,000+ posts]

I don't think you will have any issues at all.

 

[skrilla22 10+ year member]

136 amp alt is fine. I was running about 1450 watts with 120 stock amp alt with YT under hood and big 3 and I had 0 dimming.

Do the big 3, maybe upgrade to a YT/Deka and your good.

 

[spnkysprky 10+ year member]

read Here is what they have to say ...Read MDC's http://answers.yahoo.com/question/index;_ylt=AsINmeX5NFQ.wUhUVTUF2fzsy6IX;_ylv=3?qid=20080110211714AAdr8Cv

 

[audioarsonal 10+ year member]

You will be at the limits of a stock electrical system but yes it will work.When listening to music you won't always be outputing peak watts unless your listening to tones.But also remember your vehicle is pulling current as well.