Wanna learn about power more

[woodzyspl]

well im getting these 4 big ass batts, weigh in at about 600pounds just them LOL

if not enough add MOREEE

[One Way]

how would you determine how much power you can get out of an alternator?

like is there an equation or something?

Is there an equation to tell you exactly how many calories a specific burger has? Yes, but very timely. You can always test your alternator output yourself at idle speeds and at low RPMs...OR...go with a company under a name you can trust. I know that with my Mechman 270 units I clamp AT LEAST 270 amps.

not trying to upgrade alts just yet...too pricy and im a broke college student, im just trying to see how much power i can get out of my stock alt.

[woodzyspl]

not my bike, but it about as tall a the bikes wheel lol

[One Way]

not my bike, but it about as tall a the bikes wheel lol

are those dry cells?

[miniSPLlancer]

Big enough to stick in the ground and stop cars lol

[scooter99]

Wow lots of great info. I need to sit and process it a bit and understand it better. Thanks guys, ill be back in a bit! That link did help also thanks for that.

[Wicks]

Batteries should have an output current capacity rating.

If you want to run the system full tilt without the alternator running, then make sure you have enough batteries to supply the current required.

Batteries also have an Amp-Hour rating which tells you how much "power" the battery holds.

A battery with an Amp-Hour rating of 20AH will supply a current of 10 amps for 2 hours (10a * 2hr = 20AH).

So just use that formula with your batteries to see your capacity.

[scooter99]

Ok so here's what I see. My plans in my truck include an AQ3500d.1, and 3 AQ4x90's. So let me break it down the way i'm understanding it based on what you guys have said.

AQ3500D.1 max - 7500watts @ 18v (7500 ÷ 18) 416.99a x 20% = 83.33 + 416.99 = 499.99 amps

AQ4X90 max - 360watts @ 14.4v (360 / 14.4) 25 x 20% = 5 +25 = 30 amps x 3 = 90 amps

499.99 + 90 = 598 amps total

Looking at batteries, im guessing the ah is what needs to bepaid attention to. In this case the xspower D3100 has an ah of 110. So that leads me to this formula.

598.99 (amps) / 110 = 5.45

So taking that into account I would need 6 batteries for the audio system.

For the 598.99 amps, I would need either:

2 - 300 amp alternators

Or

3 - 270 amp alternators

It depends on what are made for my truck.

Power wire, i'm a little sketchy on. I looked at a couple of places and i'm seeing a rating of 119 amps, 250 amps, and 350 amps for 1/0 ga. So I went with 250.

598.99 amps / 250 amps = 2.40

So that's 3 runs of 1/0 for positive and then match with 3 for negative.

So here's the final list as I see it:

2 - 300 amp alts or 3 - 270 amp alts

6 - xspower d3100 batteries

6 - runs of 1/0 ga cable (3 pos & 3 neg)

Am I close or where am I at? I know I need fuses also.

[AMI CUSTOMS]

^^^^You are way off lol. Part of were people get the info is from EXPERIENCE!!!! Here is a rule of thump for ya, for every 2k of power you need 1 group 31 battery just to run the amp healthy. And then 220+ amps of charging current to keep it above resting voltage(13.1) this is ideal you never want the battery to drop below resting in any situation. AQ3500D.1 pulls 380 amps at full tilt at 14.4 volts. You need 2 group 3100s and need to match the current demand with alt charging to maintain above resting voltage. So 2(270) amp alts will cover all the amps you listed.

[9515ROB]

Alot of the time with big builds like myself and steve and other people that do alot of demoing we usually try to fit as much batteries and alts as we can.

Yes the right way to do it is buy figuring out your current draw to see what all you need. But it never hurts to build your electrical system to strong.

I have been running 9 103ah C&D batts in my mustang. This year im switching them all out to alot better batteries and im going to try to run 12-15 North star Nsb-90s. They are 104ah each if i remember right. Im only going to be running some where around 20k.

So some people might say its a little over kill but Im also not able to fit dual alts on my car so that extra battery will help out with my voltage problem