<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>It's the lights that will get you. JB should chime in here soon, but as I recall SF in Vt maxed at around 15-20kw for sound and in the neighborhood of 50k for lights.<br></div><div><br></div><div><br>Dan Brown<br>Foxfire Energy Corp.<br>Renewable Energy Systems<br>(802)-483-2564<br><a href="http://www.Foxfire-Energy.com">www.Foxfire-Energy.com</a><br>NABCEP #092907-44</div><div><br><br></div>
<blockquote id="replyBlockquote" webmail="1" style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size:10pt; color:black; font-family:verdana;">
<div id="wmQuoteWrapper">
-------- Original Message --------<br>
Subject: Re: [RE-wrenches] PV powered music festival<br>
From: R Ray Walters <<a href="mailto:ray@solarray.com">ray@solarray.com</a>><br>
Date: Wed, April 27, 2011 9:04 pm<br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
<br>
Solarfest in Taos had a solar powered stage for years, so it definitely can be done. I've been into sound stuff lately, and I can say the loads are extremely variable.<div>I have a 600 watt rated amp, (class D design) that I peaked at 270 watts input and averaged about 150 watts while I was testing with a very low frequency signal.</div><div>I used a Kill-a-watt meter for the test, and the amp's clip light came on. </div><div>I also tested a class A amp (much less efficient) but I found the same thing: I never could get the input watts even to half the rated output of the amp.</div><div>No load draw was about 20 watts.</div><div><br></div><div>I'd start at having enough inverter surge power to meet all the amps cont. rated output. You'll also want enough battery to hit the surges on the bass notes. (pretend its a well pump)</div><div>Car audio guys know that more battery = more boom.</div><div>You should be able to get some idea of the loads from the generator size that worked before, also.</div><div>Find out how many bands will play each day, and approx how long their sets will be to get KwH/ day.</div><div><br></div><div>Sinewave is mandatory, although the Taos Solarfest used a pair of Trace SW4024s as I recall.</div><div>The rest of the system was 8 L16s, an 8000 watt generator, and about 1000 watt array (again based on my foggy memory)</div><div>This wasn't for the main stage, but a secondary stage that worked well for maybe 5000 people.(their bass was a bit wimpy though. Might want to go with more battery)</div><div>I also recall that this was a trailer mounted rental unit from Sacred Power in Albuquerque, so they may consider some kind of leasing/ rent to own arrangement.</div><div><br><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>R. Walters</div><div><a target="_blank" href="mailto:ray@solarray.com">ray@solarray.com</a></div><div>Solar Engineer</div><div><br class="khtml-block-placeholder"></div><div><br class="khtml-block-placeholder"></div><br class="Apple-interchange-newline"></span> </div> <br><div><div>On Apr 27, 2011, at 5:15 PM, boB Gudgel wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite" style="border-left: blue 2px solid; margin-left: 8px; padding-left: 8px;"> <div bgcolor="#ffffff" text="#000000"> On 4/27/2011 3:51 PM, benn kilburn wrote: <blockquote cite="mid:COL121-W470AAF6D285F9DF2ED739AAD980@phx.gbl" type="cite"> <style>
#wmQuoteWrapper .hmmessage P { margin:0px; padding:0px }
#wmQuoteWrapper body.hmmessage { font-size: 10pt; font-family:Tahoma }
</style> Wrenches, <div>I have been asked about sizing PV systems for a couple different music festivals that have been run solely off of generators in the past. The problem i'm having is determining the energy consumption of music/stage (amps, speakers, lights, etc...?) loads as well as concession. The organizers have never considered the kwh of electricity used and it has never been metered. I believe the attendance of one festival is expected to be in the range of 5000 and the other closer to 15000 over the course of a weekend.</div> <div><br> </div> <div>Do any of you have any experiences in this area? How were the loads determined?</div> <div><br> </div> <div>No doubt that generator back-up will still be needed, to what extent, will be determined. So what we're looking at would be a temporary off-grid PV system with generator back-up...</div> <div><br> </div> <div>Any suggestions on how to proceed with this one?</div> <div><br> </div> <div>benn<br> </div> </blockquote> <br> <br> You might want to check the guys out from this article from a year or two ago.<br> I think it's just the kind of thing you're looking for.<br> <br> <br> <a target="_blank" class="moz-txt-link-freetext" href="http://www.prosoundweb.com/photos/category/C17/">http://www.prosoundweb.com/photos/category/C17/</a><br> <br> <br> Four (4) pacific northwest companies made some of the products for this tour including the mixer board.<br> <br> boB<br> <br> <br> <br> <br> <br> <blockquote cite="mid:COL121-W470AAF6D285F9DF2ED739AAD980@phx.gbl" type="cite"> <div><br> <span class="ecxecxecxecxEC_Apple-style-span" style="color: rgb(0, 32, 96);"><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">DayStar Renewable Energy Inc. </font></span> <div> <div><font class="ecxApple-style-span" face="'Franklin Gothic Medium'"><a target="_blank" class="moz-txt-link-abbreviated" href="mailto:benn@daystarsolar.ca">benn@daystarsolar.ca</a></font></div> <div><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">780-906-7807 </font></div> <div><font class="ecxApple-style-span" face="'Franklin Gothic Medium'">HAVE A SUNNY DAY </font></div> <div><br> </div> </div> <br> <br> </div> <pre wrap=""><fieldset class="mimeAttachmentHeader"></fieldset>
_______________________________________________
List sponsored by Home Power magazine
List Address: <a target="_blank" class="moz-txt-link-abbreviated" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a>
Options & settings:
<a target="_blank" class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a>
List-Archive: <a target="_blank" class="moz-txt-link-freetext" href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a>
List rules & etiquette:
<a target="_blank" class="moz-txt-link-abbreviated" href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a>
Check out participant bios:
<a target="_blank" class="moz-txt-link-abbreviated" href="http://www.members.re-wrenches.org/">www.members.re-wrenches.org</a>
</pre> </blockquote> <br> </div> _______________________________________________<br>List sponsored by Home Power magazine<br><br>List Address: <a target="_blank" href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br><br>Options & settings:<br><a target="_blank" href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br><br>Check out participant bios:<br><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br><br></blockquote></div><br></div><hr>_______________________________________________<br>
List sponsored by Home Power magazine<br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br>
<br>
Options & settings:<br>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br>
<br>
List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br>
<br>
List rules & etiquette:<br>
<a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a><br>
<br>
Check out participant bios:<br>
<a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a><br>
<br>
</div>
</blockquote></span></body></html>