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Any math guys out there?

Old 06-11-2006, 07:37 PM
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Any math guys out there?

I don't know but is there a way to figure out approximately how long a battery will last at a given usage?I have built a system for a friend's party boat(tug) and now I need to power it.I have a class d amp running about 400 [email protected] 6ohms and a [email protected] can I get it to last as long as possible for as cheap as possible before starting and recharging?I'm a newbie.
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Old 06-11-2006, 07:52 PM
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wait for other replies but im thinking a yellow top battery (the deep cycle one) would be most beneficial here
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Old 06-11-2006, 07:55 PM
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I was thinking maybe a couple but want to make sure.They can be charged from a charger and generator at the end of the night but still would like some good playing time
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Old 06-11-2006, 08:03 PM
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Originally Posted by pooner
I don't know but is there a way to figure out approximately how long a battery will last at a given usage?I have built a system for a friend's party boat(tug) and now I need to power it.I have a class d amp running about 400 [email protected] 6ohms and a [email protected] can I get it to last as long as possible for as cheap as possible before starting and recharging?I'm a newbie.
Yes there is.
You'd have to find the total current draw on your battery.
Once you have that you need to check the ratings of your battery, the AH is what you are looking for.
So let's say you are drawing 40 amps from your battery.
Your battery is rated at 80AH.
That means it can supply 1 amp for 80 hours, or 80 amps for 1 hour.
In this case the battery would last 2 hours.
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Old 06-11-2006, 08:04 PM
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Then what?Do i recharge?and will this last long or do they die from being drained and recharged?
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Old 06-11-2006, 08:10 PM
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sorry,and does that mean if I were to run 2 80ah batteries I'd get 4 hours?
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Old 06-11-2006, 08:24 PM
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Lightbulb

Keep in mind, the voltage will also be dropping during that time frame. A voltmeter would be a good idea, as well you may want to think about keeping a spare battery tucked away....

That way you have 2 to run the system during the main part of the evening, and the spare in case you decide to stay out a little longer.....
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Old 06-11-2006, 08:45 PM
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Which means that as voltage drops, so does the output power until it hits the point that the cd player will no longer turn on. So no, it will not last 2 hours at all.
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Old 06-11-2006, 08:49 PM
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It really depends on what battery you have.
But yeah, lots of things to be taken into consideration.
But you definitely 100% need a deep cycle battery if you plan on depleting, then charging.
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Old 06-11-2006, 09:11 PM
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Ok,thanks.I am little slow with this.I know how to get loud but not how to stay loud.I need the longest I can get.If it is 2 or 3 yellow tops I'll try that.
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