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Old 09-09-2016, 11:08 AM
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Default Open Discussion About High Voltage Car Audio

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 just 5 seconds, as the batteries will be constantly charging the caps. )

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Old 09-09-2016, 11:38 AM
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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)
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Old 09-09-2016, 12:52 PM
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I'm super interested in your findings. My next build, I plan do do high voltage. My uncle does flooring, and has a GMC Savana 3500 van that looks like this, but a different color:



It has the 6.0 in it, along with a heavy transmission and suspension to haul the weight. I was planning to do a large ratio 4th order with 18's in it. I can get group 31's from the shop I used to work at for less than $100 (shop cost).


My uncle just bought a Ford transit van because he doesn't have as much equipment to haul anymore and it gets better gas mileage.

I just put in two job applications yesterday. If I get one of them and have a steady cash flow, I'm going to buy my uncle's old van from him.

I already have 28 AGM batteries, that I would use until they were scrap.

I'd build a temporary box for my 8 15's, and I'd basically just have to sell my 7k's and alternators.

Any advice or more information that you can share? Where would I go to get the high voltage amps? Should I talk to Shizzon or someone else?

I met a Banda dealer who can get me their 30k's for $1,200 a piece. Would Taramps or Banda be the better deal? Thanks
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