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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Benn,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I have a little experience from about a decade ago. Don’t know how useful it will be though.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>AEE and DC Power used to team up to supply power for a three-day outdoor music festival in Mendocino Co, CA in the mid 90’s and early 2000’s. Music from 5-8PM on Friday, and from 11AM-10PM on Sat and Sun. I don’t know how big the crowd was - 5-6000 I would guess.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>We would bring a rack-mounted 12kW Exeltech MX inverter set-up (24V and not even N+1 redundant) and 5-6kW of PV (a lot of 120W modules). DC Power would bring two big tractor-trailer loads of industrial wet-cell batteries (I have no idea what the total amp-hours were, but a hell of a lot).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The sound crew would show up each year with a bigger set-up, even though we warned them that the power supply was limited. Stage lighting was left on generators running biodiesel.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The last year that we did it, the sound guys showed up with a sound system rated at 14kW. It drew 6kW just being on with no sound. Not even a hint of buzz or hum from the inverter power. The MX is good stuff.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I nervously watched that Exeltech all weekend as the bar graphs on each power module stayed in the red over-load range for most of each band’s set. When the drummers or bass players would go nuts it was all red lights. We were measuring up to 600A of current flowing through the four pairs of 4/0 cables coming from the batteries, and a good bit of voltage drop as the cables were at least 30’ long. The inverter was seeing less than 24VDC most of the time. The cooling fans on the MX modules would run for 20-30 seconds, and shut off for a minute or two and then come on again. This is with temps in the upper 90’s, and the inverter sitting on the ground under the stage. Even with all this torture, the Exeltech never even hiccupped, which was quite impressive. The sound engineer was hollering at us that the inverter was clipping off the high notes, but neither I, nor the audience ever noticed. All I could do was shrug and tell him that he was warned about limited power availability. The music was great. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>By the end of the weekend, those batteries were pretty drained, so it’s hard to actually say that the show was “solar powered”. Sitting around with a few beers afterwards, we all agreed that the ranch owners could install a 2kW grid-tie system on a tracker at the concert site and that system would produce all the energy needed for the show in a year’s time, likely including the energy use for the lighting and by the vendors. This would have required that utility power be brought to the site, which would have been a rather expensive deal, but would have made more sense, and would have made it a more truly solar-powered event.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Brian Teitelbaum<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>AEE Solar<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>benn kilburn<br><b>Sent:</b> Wednesday, April 27, 2011 3:51 PM<br><b>To:</b> Wrenches<br><b>Subject:</b> [RE-wrenches] PV powered music festival<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Wrenches,<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>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.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Do any of you have any experiences in this area? How were the loads determined?<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>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...<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Any suggestions on how to proceed with this one?<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>benn<br><br></span><span class=ecxecxecxecxecapple-style-span><span style='font-size:10.0pt;font-family:"'Franklin Gothic Medium'","serif";color:#002060'>DayStar Renewable Energy Inc. </span></span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"'Franklin Gothic Medium'","serif"'>benn@daystarsolar.ca</span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"'Franklin Gothic Medium'","serif"'>780-906-7807 </span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"'Franklin Gothic Medium'","serif"'>HAVE A SUNNY DAY </span><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p> </o:p></span></p></div></div></body></html>