2400 wrms how much amperage?

Hi guys/girls I'm new to the forum and wondering if you can help me with my dilemma. Well I will be hooking up 2 rockford p400.2 2channel amps @ 100wrms/x2, amd 2 rockford bd1000.1 mono block @ 1000wrms/x1. So technically 2400wrms total system power. How do you think should I power this, upgrade alternator with 2 batteries and the big 3 upgrade. Or if you any suggestions please let me know, and if you know any diagrams were I can take a look for info that would be great. Thanks

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DRIVE SLOW WITH BIG SOUND

Yes, sure why not, and absolutely.

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Please excuse KarTuneMan... It was late, and he had been off the coffee for several hours

Additional batteries are just additional load for an alternator. Unless you are planning on doing a bunch of "parking-lot-listening" forget the additional battery idea.

If you DO install a second or even third battery, do not use any isolators, and make sure you buy all new (and identical) batteries at once, install them in parallel.

You will want at least a 300A alternator for a system that big, especially if you like to run it WFO.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

thanks for the comments. guys

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DRIVE SLOW WITH BIG SOUND

Hi guys,

Just wondering how amperage do I need to power that kind wattage, I have calculated all the fuse's from my amps and it is 440 amps, if I upgrade my alternator to HO 170AMPS, and use 1/0 guage wire and use a 500amp ANL CERAMIC FUSE from the battery will that be sufficent given that I use 2 1.5 farad caps for my 2 mono block amps that push 1000wrms each. And leave my 2-2channel stereo amps that push 200wrms each with out caps. I am worried that according to the awg 0 guage wire can only handle like 300amps. What do you think any suggestion will be well appreciated, I know this ties into my old post but hopefully this is more accurate.

My system

2- rockford bd1000.1, 2-rockford p400.2, 2-rockford p3 12", and 1-Jbl 15" GTI series, jbl 953 components 6 1/2" 1 pair, jbl 6x9 1 pair 

  

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DRIVE SLOW WITH BIG SOUND

The mods will likely tie this thread in with your previous thread of yesterday.  There's a forum rule in the stickies above that talks about this...

In the first thread you used the phrase "technically 2400 watts total" when you referred to total system wattage.  In this one you didn't say it quite that way.  But it IS technical, insofar as how you have the amplifiers loaded and how accurately you have the gains set.  Counting up fuse values is the common practice but you can also temper that ideal with HOW you actually have the amps loaded.  For example:  are the sub amps loaded at 1 ohm each, or 2 ohms?  And your component amp, is it running at 2 ohms per channel or 4 ohms?  You know that the ratings for these amplifiers is somewhat generous and wattage is referring to lowest impedance load.  Wattage boasting nowadays tends a bit to the "max".  So...

...if your front speakers are 4 ohms (as most are) you can cut that amperage in half.  And if your subs are 2 ohms you can cut that in half as well.  This is referring to the loads on the amplifiers themselves.

Any gains that are set inaccurately (e.g. too high) can cause a great increase in amperage pull by producing those flat top sine waves.  If the system sounds unbearable at your "loud" volume then this is likely happening.  Make sure you take the time to set gains correctly.

Caps:  parallel both caps before the distro block and keep everything close together with short wire runs.  I read that in one of haemphyst's posts the other day and it makes a lot of sense (rather that just capping the mono blocks).

1/0 gauge wire has handled a lot more than what you have, I think.  If it gets warm to the touch at WFO, its not enough.  I doubt that happens.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

I answered that question already... 300A

Geez, do I do it just to hear myself think? (Sorry, haven't had my coffee yet...)

It doesn't matter what the fuses add up to, you are only concerned with the output power. For that, confer with the manufacturer, and gather that information based on the load you plan on having on the amplifiers.

This example only uses the number that you have provided me:

2400 watts out / .8 (for 80% efficiency) = 3000 watts in
(Pretty close efficiency number, considering 83% of your power is in the Class D subwoofer amplifiers - your actual mileage may vary)

3000 watts / 14.4v = 208A

208A for JUST THE AMPLIFIERS. You still have to provide power for all of the accessories in the car like windows, seats, A/C, headlights, fans, the fuel pump, ECU, and IGNITION COIL (Oh yes, the engine IS an accessory, kiddies)... You know, little things like that...

One last thing... 500A is about 150% of the rated capacity of 1/0 cable. Don't fuse 1/0 over 350A, it's not safe.

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

thank you far all the info guys. I needed too clarify these things because I never went this far with my previous systems. Thanks a mill.

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DRIVE SLOW WITH BIG SOUND