2015 Mondo Stereo Build

[trayson]

Magic Kicker Beans

Even with the best of specs, run time is an estimated guess at best. You need to calculate the wattage based on how the amp chnls are loaded, rather than using the marketing numbers. Lets say you have a "1000W" amp, but only run each chnl at 4 ohm. In reality, you are likely seeing a fraction of that advertised number. Further, you cant really apply ohms law when one part of the equation is in AC and the other is in DC. As example, dividing 2400W output by battery DC.

The most accurate, and its still an estimate, is to determine the amps' DC current draw and use that with the battery bank Ah. to determine reserve.

And how can we determine the DC current draw? Or even get some wild-ass-guestimation of it?

I was curious about this ... as using the rated wattage to speakers doesn't factor in efficiency of the amp. 'Cause let's be honest, I've always known my WS amps are better than Dusty's exile were and certainly better than the PPI's

LMAO!!! Touché!

[David Analog]

Finding the estimated current draw via any set calculation sure would be complex and inaccurate. The current draw is based on DC in but AC out. Music is very transient and so the draw is just a fraction of the of the DC to DC calculation. The amplifier efficiency comes into play, amplifier by amplifier and channel by channel. You have different amplifier classes (AB, H, D), efficiency changes at different impedance loads, efficiency changes at different power levels, and so on. Each system is different. Bad system set-up, bad system tuning, a bit of clipping, type of music, equalization, and many other factors can have a substantial impact on efficiency.
I recommend this. Upon your first typical long outing, starting the day with a fully charged battery bank, run the system at rest under normal conditions down to 12.0 volts. Now you're finished and you have your time.
Beyond that, the real experiences of others is as good of a reference as any.

[MLA]

Tray,

You can measure the current draw through the amp cables using an Amp-Clamp meter. Real easy if you have a trunk line that feeds all the amps. For a more conservative outcome, meaning the final number has you running out of battery sooner than reality, you can add up amp fusing and use that as your amp draw.

Again, the final number is an estimation at best. Too many variables to get an accurate number. Its best to use a conservative calculation and then over build the reserve, than to try and calculate down to the minute.

[viking]

I was curious about this ... as using the rated wattage to speakers doesn't factor in efficiency of the amp. 'Cause let's be honest, I've always known my WS amps are better than Dusty's exile were and certainly better than the PPI's

Hahahahahah - that is good stuff!!

[dusty2221]

With all of that said, can we agree that 6+ hours at full volume with that amount of speakers/amps all on a single battery does not sound like an accurate guess?

[BrettLee3232]

With all of that said, can we agree that 6+ hours at full volume with that amount of speakers/amps all on a single battery does not sound like an accurate guess?

Maybe I have a hidden battery somewhere....shhhhh I'm not telling lol

Or maybe it's a very conservative number?

When I was researching my install he highly recommended me getting one. He used them all the time & work great. He didn't even sell it to me, he told me where I could get it cheaper. I was amazed at the sheer size and weight of this battery. He said they have an upgraded model which is in the shape of a briefcase but he didn't think I needed something like that for my system.

7+hrs & I didn't even have to switch batteries to start.


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[beat taco]

Maybe I have a hidden battery somewhere....shhhhh I'm not telling lol

Or maybe it's a very conservative number?

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Drama Brett lmao

[Stazi]

Awesome stereo build. Crikey, that has to be seriously loud.


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[trayson]

With all of that said, can we agree that 6+ hours at full volume with that amount of speakers/amps all on a single battery does not sound like an accurate guess?

I'll agree with you. Well, as long as you play nice about my PPI amps and zip ties!

[FlatLander7]

I'll agree with you. Well, as long as you play nice about my PPI amps and zip ties!

Not the zip ties.. never...
Man has 3grand perched on the tower and wants to zip tie 'em...

Words can't even begin.. lol

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