How To Power High Powered System From Battery

slaz wrote: I agree that something good could be done with 3-4-5 well chosen car amps and 100Kg or so of lead - but it would still be nowhere near driving that speaker stack to its full potential (as specified by the OP). Even the above would involve some pretty damn heavy cabling etc., some knowledge/research to make it safe and reliable .... and probably involve an inverter (+ a bit more lead) to run outboard stuff (unless you're gonna go modding LMS, mixer, EQ etc.).

If he wants to drive the system to the limit then he must forget about batteries, but if he wants to go for batteries, he must know wich options he can do, instead of just say, no can do, try to give a example of what he can do.

A genny will be the option if you go for the amps you have.
Car amps will be the solution if you want to go for batteries, the mixer, eq etc. could go over a inverter, they dont use a much power as a amp, or you can do the eq on a minidsp, and see if theres a other solutions for mixer, like a Traktor and a ipad or some other small usb driven mixer.
The amps you have is as you say oversized for the system, because you dont want to push it to the limit, with car amps, you have to push it to the limit to save power.

One of my friends are building a system for the Roskilde festival, witch 8 BFM Titan48 and 8 BFM Omnitop12, and using two Pioneer GM-D8604 and Two Bassface 1.2, and expecting about 140 db. on full power. That would be enough for a big crowd.

I think it's possible.

Please note that where BassFace db1.2, db1.3 and db4.1 are class D the rest of BassFace's line up is not. To pull this off to even some degree, all amps must be class D as it generally cuts the needed battery capacity (and thereby size, weight and price) to 1/4th or 1/5th.

Edited by Saturnus - 08 October 2015 at 10:47am

Peter Jan wrote: swoo wrote: Peter Jan how would you suggest being able to drive a vehicle while connected to a generator? I cannot have it inside the vehicle due to the emissions as the vehicle will also be my home. I cannot have it on a toe-bar at the back as the sound system is playing out the rear doors and that is where the audience will be standing. The only way I can think is if I attached it to the roof? But that calls for some health and safety and makes it rather difficult to access. I would be interested in hearing other ways to do it. I didn't get that info earlier, but how about some pictures of this vehicle ? I'm thinking... do you have the motor running all the time/most of the time while sound is playing ? Can't be that hard to put an extra alternator on the engine to help the batteries. While you would still need some charging system when the motor is not running, inverters and stuff, having this extra alternator can account for less needed battery capacity (=cost & weight saving). But even so, I still would not dig in all this without at least someone that knows his/her way around all this. As someone said, it doesn't take much battery to injure or kill someone.

shagnasty wrote: When the battery bank weighs 5x the genset, use the genset!!!!!!!!!

I'd use forklift batteries for your application. They can handle deep discharges without instant death (although I'd still avoid going under 50% DOD), and they can be charged extremely quickly without plates buckling if you have the juice available. Just make sure you feed them lots of water as they'll gas hard off abig charger.