SOULMUSIC

iTrader: (8)

I have been trying to design our new electrical system. I have some questions about voltage loss etc.

The voltage drop calculator shows that as we are right now, when we try to draw 200 amps from the front battery, we are losing 10.5% of the voltage by the time it hits the rear of the van and the amps.

- What is that equal to when it comes to SPL output? 10.5%??

The calculator does not have an option for adding a second run, I have been just halving the wire run distance to effectively add another run. Will that work properly?

So it says if I have 4 runs of 0/1 awg copper wire the voltage loss is less than 2%

So I guess the real question is....

What will we gain SPL wise ? Losing only < 2% instead of 10.5?

Father Yuli

iTrader: (17)

stop using a program to figure this out, that's step #1.

less voltage loss = more spl, but not as much as you think tho.

SPL output is dependant on many more factors than voltage loss.

LOOSEWHEEL

Your voltage will affect the power output of your amp. An amp will put out more watts at 14V than it will at 12V. So instead, think about the different SPL at different wattage put out by your amp. I highly doubt the correlation will be proportional however.

SOULMUSIC

iTrader: (8)

I tried using my fingers and toes Yuli, all I came up with was half a bottle of jam..
I hear what your saying though, the math only works if you KNOW the numbers for ALL the variables. Thats pretty much impossible mathematically when I know f all about electricity I'll get it eventually

LW - That make good sense...
Lets say the numbers are only approx anyhow..
If the Alt/battery can put out 14v under load at the battery, and I lose 1.5 volts through resistance going to the back of the van.
It would be approx. 12.5 at the amp.

So the lose would be whatever the approx. difference in output is between 14 and 12.5 v for each individual amp? Kinda anyhow

Thanks guys..If thats kinda it, I'm good.



So depending on what each specific amp puts out at any given voltage you may gain

RomanticMoments

You're not gaining as much as you are lifting restriction

SOULMUSIC

iTrader: (8)

ahhh yesss.. Important to make the distiction.

Menace

iTrader: (-1)

for instance for me at 14.4v with a drop of 10.2v in the lanes gave me 153.4
fully charged up and batts sitting around 16.9 did a 156.4 with a drop down to 13.7.

SOULMUSIC

iTrader: (8)

3 db, wow!!! Thats explains why at the Barrie show I noticed that a few DB drag guys not wanting to run until the batts. got FULLY charged.

Father Yuli

iTrader: (17)

you also gotta remember, he's talking about 14v vs. 17v and that some amps work much better with higher voltage, and some amps work better with more current.

i am going to guess you dont have an amp that needs that high of voltage.

actually the reason behind multiple wire runs is to allow the current to flow

can you go out to your car with a multimeter and while the car is off can you measure the voltage at the battery and then measure voltage at the end of the cables in the back. let us know what you get.

SOULMUSIC

iTrader: (8)

12.92v at the front battery posts
12.9v at the single rear kinetik 600 posts( the other amp and batt are not in right now)
12.89 at the amp terminals

We didn't test the front/back run ends unhooked before the second battery. wasn't sure if we should have or not.

So, what am I looking at here ?

What the Alt charges the batt. to?
The batteries abilities?
The fact that there's no loss really? Due tho the 2nd battery?

Things change alot under load though don't they?

According the the manual the amps are 12-18v capable.
I searched for a while and couldn't find any mention of anyone who has actually ran them above 14.4