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Open Discussion About High Voltage Car Audio


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Here is a discussion from Facebook, I though would be healthy to discuss.

We know that a 300 amp burst will bring a single D3400 battery down to 10.X volts, but will be ok for burst and not permanently damage it.

So we also know, 237 is the absolutely max resting volts of 18 batts wired in series.

237v / 18 batts = 13.16v (rest)
13.16v x 22 batts = 290v

The plan for October is to have 22 batts, that's why I mention 22.

Below are the maximum wattage numbers that I could theoretically achieve based on my battery bank of 22 XS Power D3400s. This number does not matter how many 60ks I throw in there.

237v x 300a = 71,000va
290v x 300a = 87,000va

(I do know that once power is requested the voltage will begin to sag.)

I enjoy theorizing and analyzing audio, and I thought I like to share a small amount of that with you guys who are curious about my particular setup. Moving forward, I could instead of add 4 more d3400s, I could try adding 4 20ah lithiums for example, or some nimrods, or even caps to create or improve a better capacity and reserve to have even more power.

---

A good friend of mine, Mike Digouardo had this to say:

Mike Dioguardo And for those who suggest supercaps...

" if you wanted to use 350F 2.7v Maxwell caps…

290v / 2.7v = 107 cells needed
350F/107 cells in series = 3.2 Farads

Each cell has an ESR of 3.2miliohms, or 0.0032 ohms, so…
0.0032 * 107 cells in series = 0.34ohms of ESR, which can give you a maximum output current of…

290v / 0.34 Ohms = 852A Max Current Output

And a total maximum power output of…

290v * 852A = 247,080 Watts Max Power Output
"

"A small supercap bank alone gives you 247,080 Watts of available power, or 5x more power then using just batteries. But of course, playing time is the limiting factor here.

So lets say you wanted to output 60,000w for 5 seconds…

Faradays Law with respect to time:
F=w*s/v^2

In other words, Farads you need = (Watts you want to output* Seconds of playing time)/ Your charge voltage, squared.
(60,000 Watts * 5 seconds of play time)/(290v * 290v) = 3.5F

Or in other words…
(60,000 Watts * 1 second)/(290v * 290v) = 0.71 Farads needed per second of play time at 60kw"

(all these calculations are done for just the caps ALONE, they do not take account into the 22x battery bank you already have. So you will have much more playing time then

IMG_20160605_202044_zpskychtwk8.jpg

165db with 237 DC Volts

6 15" SSA Evils

3 HV Taramps T60k @.33

18 XS Power D3400s

Add me on SC, FB, IG, and YT @ Sencheezy

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Just a heads up, High Voltage Car Audio is the name of James Taylors shop. haha Clickbait!!!! you got me

In other news, it would be interesting to see the difference of adding a lithium in series at the end would do. since it will put out an almost linear amperage curve til its almost completely discharged when a load is applied.

1999 GMC Yukon, 6 PSI platform 5 18's, 4th order bandpass by BHE, Taramps,

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And as for cost.

107 caps x $8.86 = $948.02

That gives you 247,080 Watts for 1 second.

or

60,000 watts for 5 seconds.

22 D3400s x 260 = $5,720

That gives you 87,000 watts burst

But a lot longer play time. (Still calculating)

165db with 237 DC Volts

6 15" SSA Evils

3 HV Taramps T60k @.33

18 XS Power D3400s

Add me on SC, FB, IG, and YT @ Sencheezy

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Good stuff senchez. Looks like your doing the same shit we are, and pushing for finals. Wish you the best of luck my friend. Keep us all informed of any and all findings, opinions and suxh please. Again, like many others, best of luck getting staged for finals.

KB

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And as for cost.

107 caps x $8.86 = $948.02

That gives you 247,080 Watts for 1 second.

or

60,000 watts for 5 seconds.

22 D3400s x 260 = $5,720

That gives you 87,000 watts burst

But a lot longer play time. (Still calculating)

You have made a few errors in your calculations

First you need to remember usable voltage

I believe your amps operate down to 150(?) volts so for sake of example lets say that

you need to then subtract your lower voltage potential from the higher voltage potential

In this case (neglecting efficiency losses)

290x290x3.2=269,120

the lower potential

150x150x3.2=72,000

subtract the latter from the former and we are left with 197,120

Its cool that you calculated loss from the resistance though. That never would have crossed my mind. However you neglected amp efficiency?

so that 197,000 watts you have are input watts. Output will depend on the efficiency of the amp. since it isnt listed lets be generous and say 85?

197000x.85=167,450

divide that by 5 seconds

and you will find that bank does not support 60k, rather, 33k

Which is still hugely impressive but not what you were expecting

-Matt

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Audio Legion 3500.1D

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And as for cost.

107 caps x $8.86 = $948.02

That gives you 247,080 Watts for 1 second.

or

60,000 watts for 5 seconds.

22 D3400s x 260 = $5,720

That gives you 87,000 watts burst

But a lot longer play time. (Still calculating)

You have made a few errors in your calculations

First you need to remember usable voltage

I believe your amps operate down to 150(?) volts so for sake of example lets say that

you need to then subtract your lower voltage potential from the higher voltage potential

In this case (neglecting efficiency losses)

290x290x3.2=269,120

the lower potential

150x150x3.2=72,000

subtract the latter from the former and we are left with 197,120

Its cool that you calculated loss from the resistance though. That never would have crossed my mind. However you neglected amp efficiency?

so that 197,000 watts you have are input watts. Output will depend on the efficiency of the amp. since it isnt listed lets be generous and say 85?

197000x.85=167,450

divide that by 5 seconds

and you will find that bank does not support 60k, rather, 33k

Which is still hugely impressive but not what you were expecting

And that's the exact kind of feedback I was looking for! Haha, again, this is all brand new to me. Something else pointed out was the calculation between the 350F model and the 3000F models.

I wonder what the performance difference would be there. The price of the 3000F is higher though, at 52 bucks each.

165db with 237 DC Volts

6 15" SSA Evils

3 HV Taramps T60k @.33

18 XS Power D3400s

Add me on SC, FB, IG, and YT @ Sencheezy

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With the 3000F caps you are looking at (given the same voltage restrictions and efficiencies) roughly 24 seconds play time at 60k watts. Much much more reserve like that

1.46Mw of power

-Matt

2005 Dodge Magnum RT
JVC KD-AVX1

2 PPI S580.2

Obsidian Audio ST1 Horn Tweeters

PRV 8MB450s

Audio Legion 3500.1D

2 RE MT 18s

360 ah LiFePO4 Battery
SHCA 2/0

155.2 @ 29 hz



Kicker CVR 15's build
DD 3512e build
Mini T-Line Build
(6) 8s Build
Nightshade 15s Wall Build
Magnum AB XFL 12s Build
Newest Magnum Build

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I've also scratched the idea of running 22 agm D3400s. I have now set my eye on Lithium HV. So for World Finals, my goal will remain 165 outlaw with 3 amps and 18 D3400s. Please keep in my mind, no matter how many 60ks I throw in there, based off my battery bank, I can only have 35-45kw.

The below picture is the mock-up.

IMG_20160911_173821_zpsozxduqjz.jpg

The below image is for my future power plant.

Screenshot_2016-09-10-18-35-52_zpsrazob1

The below image is of the proposed bank from JY Power. The specs:

27 13.3v cells in series. 396dcv fully charged, 359dcv float.

received_10209087512680929_zpsspnixbvv.j

165db with 237 DC Volts

6 15" SSA Evils

3 HV Taramps T60k @.33

18 XS Power D3400s

Add me on SC, FB, IG, and YT @ Sencheezy

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Make sure to design some cooling into the battery rack. The watt density on those cells could cause the temperature to reach dangerous levels. Remember those two wheel hover boards? I would also recommend some type of temperature monitoring system to shut the system down in the event of over temperature and over current. I would also isolate them into as many separate banks in different locations so in the event of a mishap, the disaster can be isolated. Just thinking out loud. I love what you are doing. Keep it safe.

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