Seriously high output lithium battery packs.

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   I think it's finally happened - after years of scanning through the various Chinese wholesale retailers and eBay listings I found a type lithium pack that looks really worth the while for high output 12v systems where low weight is a primary concern: 
http://www.aliexpress.com/item/Xin-Sheng-Li-12V30AH-high-power-batteries-60A-current-xenon-lamp-lithium-battery-12V-large-capacity/32313379903.html

Not sure if these are particularly a good price or reliable retailer - It's hard to be sure, but it's the basic variety of battery pack that's on offer here that's exciting.

Although it's quite small - certainly for the cost - it also has a very high burst and continuous current rating, at 45 and 60 amps respectively

That means at it's rated voltage (12.6v when fully charged) this thing can pump out a massive 756 Watts, enough to power almost all mainstream mid-high power monoblock 12v sub amplifiers (I just picked up an Infinity Kappa One (Harman Kardon subsidiary) which can put out  800 Watts RMS in one 2ohm channel (in this case RMS meaning 1%THD+N) with a 12.6v input (not sure on exact voltage but in that ballpark) - stable down to 1ohm so you could hang 4x 4ohm or 8x 8ohm subs off one of them so long as you kept it under control and the amp would probably need a fan srapped to it! And with a crest factor of 8-9dB on the music signal that one piddly looking 2.5 kilo helmet torch battery would play for 4-5 hours on near enough full volume, and 16 hours plus at what most people would still consider to be an unacceptably loud volume, especially if it's used outdoors which is the most likely case scenario for 12v sound.

Throw into the mix a pair of 100 watt 12v flexi solar panels 2.5 kilos and about £100 each, a 200 Watt solar charge controller about .5 kilos £20 and you're looking at a system which never ever falls below acceptable levels of sound output even on a cloudy day, saving further battery life on a a backup system which delivers 50 Watts per channel at 4ohms through ultra-high efficiency class D chip amps into as many seperate channelled drivers as your system contains. So about £370 for a fully solar-charging battery system capable of outputting 756 Watts or £520 for one that can provide peaks of up to 1512 watts. (with 2 amps, the other channel could be running on midtops), and weighing just 12 and 19 kilos respectively including amps. + whatever you spend on the amps, I paid £72 used. That's new Playstation or New Xbox pricing levels, practically in toy territory for many people. Providing you don't basically rag the battery all day, which isn't good for any battery anyway, you will get the same functionality from this set up as you would get from a much larger, much heavier and not much cheaper leisure battery weighing upwards of 30kg for the battery alone.

Plus, flashy bling solar on your rig: excellent!

Edited by Hemisphere - 31 March 2015 at 3:29pm