Re: [RE-wrenches] Megger Testers
Kingsley, The concern I have about this unit, and many other inexpensive ones like it, is that it does not have enough resolution in the low impedance area. PV arrays can have an impedance to ground of as low as 2kOhms. A resolution of 0.1MOhms will likely not cut it. I just bought a $175 meter for fun and I will take it out into the field to try it next to the Fluke 1520. If we can get decent information, great. But the better resolution may require spending closer to the $700 or more. The key is that you don’t want to be chasing a ground fault that really does not exist. The resistance to ground can be so low that a simple meter will call it ground-faulted. I’ll let you know what I find out. I’m betting that megger testing PV arrays is about to get required much more regularly. Bill. From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Kingsley Sent: Saturday, April 11, 2009 9:24 PM To: RE-wrenches Subject: Re: [RE-wrenches] Megger Testers ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Megger Testers
Hi I have one, it waas less than three hundred I have used ot look for wiring porblems particularly if the problem only occurs when the system is wet. Caution mine will generate about 3000 volts, which I believe can damage several pieces of equipment. Darryl --- On Sat, 4/11/09, Howie Michaelson ho...@suncatchervt.com wrote: From: Howie Michaelson ho...@suncatchervt.com Subject: [RE-wrenches] Megger Testers To: RE-wrenches re-wrenches@lists.re-wrenches.org Date: Saturday, April 11, 2009, 1:43 PM Hi All, I'm in the market for a Megger tester, although I've never used one before, and am not sure of what options or price range I should be considering. I will primarily being using it for testing PV wiring (DC and potentially AC single phase), although I'm not sure if there are other opportunities I would be interested in using it for. I've seen prices ranging from less than $100 to several thousand. Does anyone have specific models they would suggest or features that I should be specifically interested? As always, thanks in advance for any info, Howie -- Howie Michaelson NABCEP Certified Solar PV Installer™ Sun Catcher, LLC Renewable Energy Systems Sales and Service VT Solar Wind Incentive Program Partner http://www.SunCatcherVT.com (cell) 802-272-0004 (home) 802-439-6096 ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Megger Testers
This is the one I use. http://www.emsco-usa.com/fluke/fl1520.htm Aram -Original Message- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Darryl Thayer Sent: Saturday, April 11, 2009 3:51 PM To: RE-wrenches Subject: Re: [RE-wrenches] Megger Testers Hi I have one, it waas less than three hundred I have used ot look for wiring porblems particularly if the problem only occurs when the system is wet. Caution mine will generate about 3000 volts, which I believe can damage several pieces of equipment. Darryl --- On Sat, 4/11/09, Howie Michaelson ho...@suncatchervt.com wrote: From: Howie Michaelson ho...@suncatchervt.com Subject: [RE-wrenches] Megger Testers To: RE-wrenches re-wrenches@lists.re-wrenches.org Date: Saturday, April 11, 2009, 1:43 PM Hi All, I'm in the market for a Megger tester, although I've never used one before, and am not sure of what options or price range I should be considering. I will primarily being using it for testing PV wiring (DC and potentially AC single phase), although I'm not sure if there are other opportunities I would be interested in using it for. I've seen prices ranging from less than $100 to several thousand. Does anyone have specific models they would suggest or features that I should be specifically interested? As always, thanks in advance for any info, Howie -- Howie Michaelson NABCEP Certified Solar PV InstallerT Sun Catcher, LLC Renewable Energy Systems Sales and Service VT Solar Wind Incentive Program Partner http://www.SunCatcherVT.com (cell) 802-272-0004 (home) 802-439-6096 ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
Re: [RE-wrenches] Megger Testers
Hi Howie, I use this one: http://www.tequipment.net/BK307A.html from BK Precision. Normally I like digital readouts and normally buy from Fluke but in this case a $200 meter gets the job done. Cheers, Kingsley Chen. SunPower Corp. --- On Sat, 4/11/09, Howie Michaelson ho...@suncatchervt.com wrote: From: Howie Michaelson ho...@suncatchervt.com Subject: [RE-wrenches] Megger Testers To: RE-wrenches re-wrenches@lists.re-wrenches.org Date: Saturday, April 11, 2009, 11:43 AM Hi All, I'm in the market for a Megger tester, although I've never used one before, and am not sure of what options or price range I should be considering. I will primarily being using it for testing PV wiring (DC and potentially AC single phase), although I'm not sure if there are other opportunities I would be interested in using it for. I've seen prices ranging from less than $100 to several thousand. Does anyone have specific models they would suggest or features that I should be specifically interested? As always, thanks in advance for any info, Howie -- Howie Michaelson NABCEP Certified Solar PV Installer™ Sun Catcher, LLC Renewable Energy Systems Sales and Service VT Solar Wind Incentive Program Partner http://www.SunCatcherVT.com (cell) 802-272-0004 (home) 802-439-6096 ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
