---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 07/06/07: 7 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:03 AM - Re: Re: Automatic Headlight Hi/Lo Fallover Circuit (Robert L. Nuckolls, III) 2. 08:37 AM - Re: Battery Won't Take a Charge (dannylsmith) 3. 09:38 AM - Re: Re: Battery Won't Take a Charge (Matt Prather) 4. 09:40 AM - Re: Battery Won't Take a Charge (Ron Quillin) 5. 09:41 AM - Re: Re: Dynon Compass mounting () 6. 12:28 PM - Re: Re: Battery Won't Take a Charge (Robert L. Nuckolls, III) 7. 09:45 PM - Re: Re: Battery Won't Take a Charge (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 06:03:03 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Automatic Headlight Hi/Lo Fallover Circuit At 07:41 PM 7/5/2007 -0400, you wrote: > >Bob, > Sorry I wasn't clear. The magnetic current sense element as described > could be applied to the circuit described by Eric and thus eliminating > the gain block and the series resistor required to develop the I/R drop > that is the input to the gain block. Just after sending my previous post > I saw your sensor circuit post. Hmmm . . . guess I missed Eric's suggestion and got out of the loop. > So my concept was to utilize the reed switch to turn on the FET just as > you suggest turning on the LED indicator. The Volvo/Bosch module is > interesting in that it uses a bifilar winding with current from one bulb > going one way and current from the other in a pair (say front and rear > right turn signal). If both bulbs are burning the fields cancel and no > warning. This eliminates the problem of triggering a warning if the > lights are turned off or flashing. The only state that will switch the > module is unbalanced current in the 2 coils as in only one bulb lighted. Hadn't thought of that. I'll have to add it to the bag of tricks. Thanks! Bob . . . ________________________________ Message 2 _____________________________________ Time: 08:37:52 AM PST US Subject: AeroElectric-List: Re: Battery Won't Take a Charge From: "dannylsmith" Can someone take a guess at this question? Thanks, Danny -------- Danny Read this topic online here: http://forums.matronics.com/viewtopic.php?p=122511#122511 ________________________________ Message 3 _____________________________________ Time: 09:38:20 AM PST US Subject: Re: AeroElectric-List: Re: Battery Won't Take a Charge From: "Matt Prather" What's the question? We have a short attention span (at least I do, anyway), so it's probably a good idea to completely re-ask questions that don't get answered.. In the interest of being helpful, and because I was curious, I looked in the archive. A requote: "I have a couple of 12V Panasonic batteries that came out of a computer UPS that are much like the Odyssey PC680. They've been setting on the bench for months and only shows about 11.4V. (They were ok when I last used them.) When I hook the battery charger up they measure 12.9V but the charger shows 0 amps. If I leave it hooked up the 12.9V measurement remains but still 0 amps. If after several hours of being hooked to the charger I unhook it they still read 11.4 V again. Is this a charger problem or battery problem? Danny" Both batteries are at 11.4V? The charger behaves the same way when attached to each separately? Sounds like a charger problem though 11.4V no-load says the battery is quite dead, or might have a damaged cell. I think 12.9V isn't enough to really charge a battery - maybe _very_ slowly. You'll need something more like 13.5V-14V to make anything happen. You don't mention what kind of charger you are using.. You could take that charger and attach it to a battery that appears to be healthy (maybe on your car) and see what it puts out. If it reaches a normal charging voltage and current then your Panasonic(s) is(are) probably damaged in some way. Regards, Matt- > > > Can someone take a guess at this question? > Thanks, Danny > > -------- > Danny > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=122511#122511 > > ________________________________ Message 4 _____________________________________ Time: 09:40:53 AM PST US Subject: Re: AeroElectric-List: Battery Won't Take a Charge From: Ron Quillin At 12:10 7/4/2007, you wrote: > > >I have a couple of 12V Panasonic batteries that came out of a computer UPS >that are much like the Odyssey PC680. >They've been setting on the bench for months and only shows about 11.4V. >(They were ok when I last used them.) >When I hook the battery charger up they measure 12.9V but the charger shows >0 amps. If I leave it hooked >up the 12.9V measurement remains but still 0 amps. If after several hours of >being hooked to the charger I >unhook it they still read 11.4 V again. > >Is this a charger problem or battery problem? > >Danny Battery problem. I won't hazard a guess as to the exact failure mechanism, but as I understand it, one or more cells or internal connections go high resistance and the battery is unable to supply or accept any current. Ron Q. ________________________________ Message 5 _____________________________________ Time: 09:41:16 AM PST US From: Subject: RE: AeroElectric-List: RE: Dynon Compass mounting Hi Marty, I mounted mine on a bracket on the flat deck under the horizontal stabilizer. It fits well there and is very easily accessible by removing the fairing. I am not at home right now otherwise I could send you some pictures. It seems to work well in that location. Franz Franz Fux -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Emrath Sent: Thursday, July 05, 2007 5:38 PM Subject: AeroElectric-List: RE: Dynon Compass mounting Thanks to everyone for their comments and thoughts. I forget to check Dan's site first. While not exactly what I'd seen, that has started my o'grey matter to think of what to do. The tail cone seems like a neat idea unless you even need to service it. Then I'll need a "baggage compartment monkey" to get back there and fix it, not to be confused with a "trunk monkey". Marty -----Original Message----- From: Emrath [mailto:emrath@comcast.net] Sent: Wednesday, July 04, 2007 9:51 AM Subject: Dynon Compass mounting I have seen some pictures of the EDC-10 compass mounting in a side by side RV behind the baggage compartment near the top of the fuselage but I have lost the reference for these pictures. I would like to review how this was accompished to be able to replicate in my ship flattering the inventor of this install method. Does anyone have pictures of their installation of the compass module behind the baggage compartment bulkhead that they can share with me? Marty in Brentwood TN RV-6A panel wiring and sanding fiberglass. -- 6:36 AM ________________________________ Message 6 _____________________________________ Time: 12:28:37 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Battery Won't Take a Charge At 08:32 AM 7/6/2007 -0700, you wrote: > > >Can someone take a guess at this question? >Thanks, Danny > >-------- >Danny I agree with Matt that the voltages you've quoted raise some questions as to the condition of your charger. Consider a trip to Walmart to pick up a Schumacher WM-1562 charger. They're under $20 and very smart. An exemplar charging profile for this device is shown at: http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg Your batteries need to be charged with a constant current until voltage rises to something between 14.5 and 15.0 volts for a SHORT period of time. After the battery is topped off, the charger output relaxes to something just over 13 volts and stay there no matter how long the charger is left connected to the battery (maintenance mode). After you've cycled the batteries over a known good charger, the minimum test for battery integrity would be to load them t0 about 300 amps and see how long it takes for the voltage to drop below 9 volts. You can do this with an inexpensive but well crafted device from Harbor Freight http://www.aeroelectric.com/Pictures/Tools/Battery_Testers/HF91129_4.jpg These run about $60 normally but go on sale from time to time for less. I think I paid $40 for the one I have. If you done wish to acquire this capability, then go to a automotive service station and see if they'll test them for you. Hold 300 amps for 15 seconds . . . the voltage should be 9.0V or greater at the end of 15 seconds. If that test is good, then it's probable that the batteries are fit for service in the airplane but it would be a good thing to check for capacity either in the airplane or by conducting some sort of endurance bench test like that described in: http://www.aeroelectric.com/articles/battest.pdf or with a capacity tester like: http://westmountainradio.com/CBA_ham.htm The short answer to your question is, we believe your charger may not be working properly to top of a lead-acid battery. If push comes to shove, you can hook one of the batteries right to your cigar lighter in the car and leave it plugged in for a few days of driving around. I have several such adapter cables that travel with me to maintain instrumentation batteries in the field. Bob . . . ---------------------------------------- ( "Physics is like sex: sure, it may ) ( give some practical results, but ) ( that's not why we do it." ) ( ) ( Richard P. Feynman ) ---------------------------------------- ________________________________ Message 7 _____________________________________ Time: 09:45:30 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Battery Won't Take a Charge At 10:34 AM 7/6/2007 -0600, you wrote: > >What's the question? We have a short attention span (at least I do, >anyway), so it's probably a good idea to completely re-ask questions that >don't get answered.. In the interest of being helpful, and because I was >curious, I looked in the archive. A requote: > >"I have a couple of 12V Panasonic batteries that came out of a computer UPS >that are much like the Odyssey PC680. >They've been setting on the bench for months and only shows about 11.4V. >(They were ok when I last used them.) >When I hook the battery charger up they measure 12.9V but the charger shows >0 amps. If I leave it hooked >up the 12.9V measurement remains but still 0 amps. If after several hours of >being hooked to the charger I >unhook it they still read 11.4 V again. > >Is this a charger problem or battery problem? Just for grins, hook up the charger and watch the voltage while the charter is on. see if you can get a measurement every 15 minutes or so as long as it's changing. What we'd LIKE to see is a slow climb to 14.5 volts or more. However, you mentioned that these batteries had been in service on a UPS . . . do you know for how long? And were they removed from ACTIVE (UPS plugged into the wall) service? If allowed to set in a discharged state for very long, the batteries will self-destruct. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.