12 Volt Party Pics

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   The problem with inverters isn't with low powered stuff with almost constant current draw. For that inverters are actually quite efficient. Usally about 90% but you have to add the conversion loss in the 230V appliances as well, so total you should probably just add 20% or so to the power consumption.

The problem is with amplifier and other high power variable loads like lighting is that the inverter in this case "sets" itself for a much higher constant current draw than the actual average power consumption, so efficinecy can drop as low as 65%, and with the add conversion in appliances that can account for up to 40% added power consumption.
So buy as small an inverter as possible, since efficiency is best when power consumption is about 80% of the rated capacity, for all your low power appliances if it's not possible to run them directly on 12/24V, and run your lighting and amplifiers directly on 12/24V. 

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Saturnus Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 13 July 2010 Location: Copenhagen Status: Offline Points: 2025	Post Options Post Reply Quote Saturnus Report Post Thanks(0) Quote Reply Posted: 05 May 2011 at 12:24pm
	The problem with inverters isn't with low powered stuff with almost constant current draw. For that inverters are actually quite efficient. Usally about 90% but you have to add the conversion loss in the 230V appliances as well, so total you should probably just add 20% or so to the power consumption. The problem is with amplifier and other high power variable loads like lighting is that the inverter in this case "sets" itself for a much higher constant current draw than the actual average power consumption, so efficinecy can drop as low as 65%, and with the add conversion in appliances that can account for up to 40% added power consumption. So buy as small an inverter as possible, since efficiency is best when power consumption is about 80% of the rated capacity, for all your low power appliances if it's not possible to run them directly on 12/24V, and run your lighting and amplifiers directly on 12/24V.

amlu Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 30 November 2009 Location: london Status: Offline Points: 740	Post Options Post Reply Quote amlu Report Post Thanks(0) Quote Reply Posted: 05 May 2011 at 12:40pm
	Got two batteries, one 115 Ah running pure sine wave inverter, 2x CDj200 and DJM300 mixer take around 40 watts. Had it running off battery for 10 hours and there was still some power left. "Big rig" running 4x tripath amps takes 4-5amperes. 110Ah battery lasts for good 10 hours, solar panel helps too.

alphabetikal Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 20 May 2010 Location: UK Status: Offline Points: 217	Post Options Post Reply Quote alphabetikal Report Post Thanks(0) Quote Reply Posted: 05 May 2011 at 12:54pm
	amlu - your system is SWEET!

portapartyman Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 19 April 2010 Location: Norfolk Status: Offline Points: 169	Post Options Post Reply Quote portapartyman Report Post Thanks(0) Quote Reply Posted: 18 May 2011 at 3:18pm
	Here is a picture of the Porta Party @ Bearded Theory last weekend. We've rebuilt it and made it louder which means we can command our own dance floor cutting out bleed from the other stages.....apart from if you're the DJ which is a little annoying but essential to keep power consumption to a minimum

portapartyman Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 19 April 2010 Location: Norfolk Status: Offline Points: 169	Post Options Post Reply Quote portapartyman Report Post Thanks(0) Quote Reply Posted: 18 May 2011 at 3:20pm
	And here's a close up of the Porta Party Crew. Dressed up for the Punk n Ska set (above)

toiminto Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 16 June 2009 Location: tampere,finland Status: Offline Points: 48	Post Options Post Reply Quote toiminto Report Post Thanks(0) Quote Reply Posted: 31 May 2011 at 7:57am
	http://vimeo.com/12750843 some video from our party groups 6y party last summer, preparty during the day with 12v system :) 1" celestion, 10" p.audio, and 15" kappalite lf in an ugly demo box. 12" isnt in use ;) Edited by toiminto - 31 May 2011 at 8:02am
	http://soundcloud.com/toiminto

SamV Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8711	Post Options Post Reply Quote SamV Report Post Thanks(0) Quote Reply Posted: 31 May 2011 at 10:26pm
	Some Videos May Day May Fayre in Mayfair: http://www.youtube.com/watch?v=OpmIvomCSY0 NYE Greenwich Foot Tunnel Party: http://www.youtube.com/watch?v=duX86Fhq2M8 May Day @ Bank of England: http://www.youtube.com/watch?v=E4kzikiRHbA Had loads from the Circle Line Parties and Midnight Cricket we've been doing for the last 10 years but cannae find them :( Here's some pics :) I think they count?

rich_gale Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 18 February 2008 Status: Offline Points: 2697	Post Options Post Reply Quote rich_gale Report Post Thanks(0) Quote Reply Posted: 31 May 2011 at 11:00pm
	brilliant:)
	REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :)

Plaguesguitarist Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 30 April 2009 Location: Lincoln, Earth Status: Offline Points: 2238	Post Options Post Reply Quote Plaguesguitarist Report Post Thanks(0) Quote Reply Posted: 01 June 2011 at 10:24am
	Those two scuffers look pleased to be there. edit: Scuffers = rozzers. I spend way too much time reading Rogers' Profanisaurus Edited by Plaguesguitarist - 01 June 2011 at 10:26am
	Why did the lampy cross the road? To steal MY sharpie.

alphabetikal Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 20 May 2010 Location: UK Status: Offline Points: 217	Post Options Post Reply Quote alphabetikal Report Post Thanks(0) Quote Reply Posted: 01 June 2011 at 1:06pm
	sam - that beast you got on the bicycle trailer looks absolutely MEAN!! whats the specs of it? a

SamV Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8711	Post Options Post Reply Quote SamV Report Post Thanks(0) Quote Reply Posted: 01 June 2011 at 2:47pm
	At that time it was 600w on bass, 900w on mid top. All rms. Bass was run from a switchmode Class D amp at 4r with 1.8kw on tap. Tops were run from a Class GH amp at 4r. Battery was a 120ah high end Deep Cycle SLA. Run time was 4hrs at full, 6 hours at Critical Mass Volume, Almost a full day at mates down the park level, and near a week on television duties lol. That was about 3 or 4 years ago now (ah those were the days...). It was designed purely for Critical Mass but ended getting used for a lot of things including promo work and festivals.

SamV Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8711	Post Options Post Reply Quote SamV Report Post Thanks(0) Quote Reply Posted: 01 June 2011 at 2:49pm
	We were also the only system allowed to carry on playing into the SOCPA zone as it sounded good lol. And most of the time the coppers would give requests.