Bosch and Milwalkee Tool have them, I have seen them advertized and demonstrated on a mock roof, They work reliably with one layer of asphalt shingles, not with two. The cheap ones do not work. these are ultra sound I think. Darryl
--- On Mon, 8/30/10, Gary Easton <g...@arp-solar.com> wrote: > From: Gary Easton <g...@arp-solar.com> > Subject: [RE-wrenches] thermal imaging stud sensors > To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org> > Date: Monday, August 30, 2010, 8:22 AM > Anyone have experience with a thermal > imaging stud sensor or any other > sensor that will work through roofs? > Gary Easton > Appalachian Renewable Power Systems > NABCEP Certified Solar PV > NABCEP Certified Solar Thermal > 740-277-8498 > > > Drake, > > > > Chris Freitas wrote an article on this topic in SP1.1, > ³Form 12S Metering > > for Grid-Tied Systems w/ Battery Backup.² Here¹s a > link to the article and > > a > > wiring diagram: > > > > > > http://solarprofessional.com/article/?file=SP1_1_pg16_QandA_3&search= > > > > David Brearley, Senior Technical Editor > > SolarPro magazine > > > > On 8/10/10 7:57 AM, "Drake Chamberlin" > > <drake.chamber...@redwoodalliance.org> > wrote: > > > >> Hi Alex, > >> > >> The one meter hook up always seems confusing to > me. I'm still confused. > >> Do > >> we have the AC IN at both the bottom left and top > right? To me it > >> seems that > >> the AC OUT from the inverter would go to the upper > left and the > >> protected > >> loads panel would be fed from the bottom left. > >> > >> I've never used this method, but would like to use > it instead of the two > >> meter > >> method. > >> > >> Thanks, > >> > >> Drake > >> > >> > >> At 12:19 AM 8/10/2010, you wrote: > >>> When metering for production here in > Washington State, we use both > >>> sides in a > >>> 12s 120volt meterbase with fifth jaw. > top right inverter ac in, bottom > >>> right > >>> ac from grid. top left from battery back > up, bottom left from inverter > >>> ac > >>> in, fifth jaw neutral. > >>> > >>> this set up allows grid tied selling and > battery saved energy selling > >>> to be > >>> metered while subtracting energy used to > charge batteries and > >>> subtracting any > >>> power needed to run the inverter. > >>> > >>> hope this helps. > >>> > >>> contact me off list if you need the diagram > (in office) > >>> > >>> > > > > > > _______________________________________________ > > 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