<div dir="ltr">William,<div><br></div><div>Thanks for posting this. </div><div>Couple of questions:</div><div>1) Does the time stamp of the irregular wave form correspond to the UPS beeping? Perhaps if you are monitoring it remotely you cannot answer this. </div>
<div>2) Does this output waveform represent the input to the the UPS?</div><div>3) What equipment and software are you using for the monitoring?</div><div><br></div><div>I checked in with our site owner just before reading your post. He said the only thing he had done was shut down 3 of the 6 inverters. Left them off for a short period of time (in which no UPS irregularities occurred) and then turned them back on. They have then run for the past 4-5 days with no issue. Intermittent problems are hard to track down.</div>
<div><br></div><div>Since we have live people sitting in from of the computers (connected to the complaining UPS) with the right software/hardware for monitoring they might be able to correlate the occurrence in real time. Let me know what you are using.</div>
<div><br></div><div>With respect to the remote monitoring software, I have used RealVNC(aka Teamviewer) in years past (when it was an open source free tool) and found it to be a very good tool. I'd be interested in your thoughts of the current product.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Sat, Aug 9, 2014 at 1:36 PM, William Miller <span dir="ltr"><<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Friends:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">I am experiencing an almost identical problem. The system I am working on has an SMA mini-grid with 3 Sunny Islands and 3 Sunny Boys. The UPS in the AV room has been beeping. I installed a data acquisition system and have been monitoring the waveform. I will try to insert two screen shots below, but I am not sure if they will pass thorough the list-serve. It looks like we may be seeing some distortion, although this may be an artifact of the data acquisition system. I am interested in any comments any of you may have that might shed some light on this.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">I did search for the transition point between the two waveforms. The waveform went from one shape to the other gradually over about 5 seconds. The more irregular shape is rarely exhibited in the week or so that I have been monitoring.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">William Miller<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">PS: I have been demoing Team Viewer. I need to license some form of remote access software. Can anyone make a recommendation?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Wm<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><img width="891" height="576" src="cid:image007.jpg@01CFB3BD.BCAC19E0"></span><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><img width="891" height="576" src="cid:image008.jpg@01CFB3BD.BCAC19E0"></span><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><img width="64" height="28" src="cid:image009.jpg@01CFB3BD.BCAC19E0" alt="Gradient Cap_mini"><br>
Lic 773985<br><a href="http://www.millersolar.com/" target="_blank">millersolar.com</a><br><a href="tel:805-438-5600" value="+18054385600" target="_blank">805-438-5600</a><u></u><u></u></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<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 [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Carl Adams<br>
<b>Sent:</b> Monday, August 04, 2014 7:29 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] UPS disturbance with SMA Inverters<u></u><u></u></span></p><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p>
<div><p class="MsoNormal">Hello Wrenches,<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">I have a site which is experiencing nuisance disturbance of the computer UPS systems at the site. The site owner "suspects" this is due to the PV system which is a 50 kW system using 6 SMA SunnyBoy inverters. The nuisance disturbance is a clicking noise in the UPS units. The disturbance is not enough to cause the UPS to engage, so it seems to be a small disturbance on the AC power. The site owner "suspects" the inverters are the source of this disturbance since 1) It seems to only occur when we have a good solar day. 2) If the inverters are shut down the problem goes away, and if you start up the inverters the problem exhibits again.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">The site was commissioned in March of 2012 and has had no problems till this issue last month. In reviewing the event log on Sunny Portal there are no inverter anomalies. SMA tech support had not run into this issue and had no ideas, they too agree the inverters are not reporting any anomalies.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">The problem is not persistent but rather intermittent making this harder to troubleshoot.<u></u><u></u></p></div><div><p class="MsoNormal">
<u></u> <u></u></p></div><div><p class="MsoNormal">So my questions are<u></u><u></u></p></div><div><p class="MsoNormal">1) Has anyone else seen this sort of issue before, related to SMA SunnyBoy inverters.<u></u><u></u></p>
</div><div><p class="MsoNormal">2) Can you recommend an AC power monitoring tool which would support frequency and voltage monitoring on the AC line. Perhaps one data set on the circuit feeding the computers and another on the inverter output circuit.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">For clarity the six SunnyBoys feed into an AC Combiner panel which backfeeds into the building main distribution panel. The service is 240V single phase.<u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">With Regards<u></u><u></u></p></div><div><p class="MsoNormal">Carl Adams, SunRock Solar<u></u><u></u></p></div><div><p class="MsoNormal">NABCEP Certified PV Installer<u></u><u></u></p>
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