Perhaps check with an audiologist to see if they have portable equipment they could test the area with.
I know I USED to be able to hear over 20K HZ when I was 18 and lots of things drove me nuts, now I just am hearing less thanks to all the tools and forgetting to use hearing protection and oh yeah music........... Dana Orzel Great Solar Works, Inc www.solarwork.com E - d...@solarwork.com V - 970.626.5253 F - 970.626.4140 C - 970.209.4076 I will be the shift in how the world uses power! - Dana Orzel -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Ron Young Sent: Thursday, February 04, 2010 11:20 AM To: RE-wrenches Subject: Re: [RE-wrenches] Inverter causing migraine? Bob, Not a customer, an employee who works for me. She is mid 50's and has very good hearing. You may be right about sound. I also think there's a significant portion of psychosomatic in the mix but I wanted to find out if there were other instances of people experiencing distress from inverter operation just to rule out the possibility -or take it into account. I know that some people are becoming more sensitive to environmental influences but this inverter is quiet, just the usual fan sound occasionally. I used to be able to hear the sound of an ultrasonic alarm system back when I was in my 20's & 30's - now I just hear ringing in my ears. Ron On 4-Feb-10, at 1:30 AM, boB Gudgel wrote: > > Dan Fink said: > > "That's a tricky situation. There are only two possibilities for > what's causing the problem; sound or electromagnetic radiation" > > I'm betting that it's sound. Remember how you could hear > televisions singing > away at 15 kHz ?? That still gives some people headaches. > > How old is this customer ?? I'm guessing he's young because it's > most likely because he > can hear the inverter switching. We just can't normally hear > them.... The FX/VFX > inverters switch at around 20 kHz which some people can still hear. > Especially younger ones > with better hearing. > > It's probably the transformer windings and iron acting as a speaker/ > transducer. > > High frequencies are very directional so will usually respond well > to a thin wall of > padding between inverter and the rest of the inside of the house or > cabin. > That should help reduce the acoustical output. > > boB > > > > > > > Dan Fink wrote: >> Joel -- >> Good points. In a recent newspaper article in Boulder, CO about a >> really bad PV install, the direct grid tie inverter was mounted >> right on the outside of the wall from the homeowner's bed. They >> finally had to have it moved--mostly because of buzzing, but EMF >> was a concern too. It was basically less than a foot from the guy's >> pillow. >> >> Also, I forgot to mention that there are fairly inexpensive EMF >> meters available from the same places that sell DIY shielding >> materials. >> >> The biggest source of EMF at *my* house is actually the E-Meter >> measuring amp-hours. It even interferes with my handheld ham and >> fire department radio FM communications on 2 meter. >> >> DAN FINK >> Renewable Energy Consultant >> >> >> >> >> Joel Davidson wrote: >>> Ron, >>> >>> Electromagnetic fields are produced any time you have current >>> flowing through wire. They are low frequency waves that drop off >>> rapidly proportional to the distance from the source. Inverters, >>> transformers, fluorescent light ballasts, motors, clock radios, >>> power blocks, microwave ovens, kilowatt hour meters, service >>> panels all emit EMF. There is no >>> practical way to block EMF. It passes through almost everything >>> including walls and even lead. There is no U.S. safety standard >>> for EMF. Some say 8 milligauss or more is dangerous and 2.5 >>> milligauss or less is safe. >>> >>> I went through our home about 10 years ago using a borrowed >>> milligauss meter (thanks David Katz). Our utility meter service >>> had significant EMF, but that was not a problem since it is >>> mounted on an outside wall and there is a closet between the >>> living space and the meter. The EMF had fallen to below 2 >>> milligauss between the wall and the closet door. The bedroom clock >>> radio was the second largest EMF source in our home. Moving the >>> clock 1 foot away from the bed to the other side of the night >>> stand brought the EMF levels under 2 milligauss. Our SW4048 >>> inverter emitted a field that fell to a safe level 2 feet from the >>> inverter. >>> >>> I tell people not to put their bed against the wall where their >>> utility service panel or inverter is mounted. I also tell them >>> that the Japanese did a 2 year study of school children riding the >>> Tokyo subway (big EMF emitter) and found that there was no danger. >>> >>> Some sounds that most of us take for granted can cause physical >>> discomfort and even pain. SW4048 and other transformer and >>> electrical and electronic buzzing can be annoying. Also certain >>> wavelengths and intensities of light can cause pain and injury. >>> >>> Joel Davidson >> _______________________________________________ >> 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 No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.733 / Virus Database: 271.1.1/2667 - Release Date: 02/04/10 00:35:00 _______________________________________________ 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
