---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 10/11/19: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:29 AM - Re: fusible link downstream of circuit breaker (johnbright) 2. 08:14 AM - Re: Re: fusible link downstream of circuit breaker (Robert L. Nuckolls, III) 3. 09:50 AM - Re: Odyssey Batteries (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 07:29:20 AM PST US Subject: AeroElectric-List: Re: fusible link downstream of circuit breaker From: "johnbright" Schematic edited to delete fuses and relays between injector bus and battery buses. -------- John Bright, RV-6A 25088, at FWF O-360, 8.5:1, vert sump, dual SDSEFI EM-5-F Z-14 modified for EFI Newport News, Va Read this topic online here: http://forums.matronics.com/viewtopic.php?p=491769#491769 ________________________________ Message 2 _____________________________________ Time: 08:14:11 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: fusible link downstream of circuit breaker At 08:25 PM 10/10/2019, you wrote: > >Whenever fuses are connected in series, there is a chance that both >could blow. Consider increasing the 15 amp fuses to 20 or 30 amps. > >-------- >Joe Gores better yet . . . one protective device per feeder with that protection located as close as practical to the source. Fusible links are baby brothers to 'current limiters' . . . Emacs! These are for protection of power distribution feeders and their stated ratings are exceedingly conservative . . . they will generally continuous carry several times their "nameplate" rating as do fusible links. http://aeroelectric.com/Mfgr_Data/Fuses_and_Current_Limiters/Bussman/ANL_Specs.pdf Note spec sheet cited above says an ANL35 trip curve goes parallel to infinite trip-time at about 95 amps! A 22AWG fusible link has a "nameplate" rating on the order of 7A with a continuous carry of more than 20A. http://aeroelectric.com/Pictures/Wire/22AWG_20A.pdf They stand off hazards for hard faults against upstream batteries. You will rarely find these used on small aircraft but they can be useful . . . like extending the feeder from a fused bus to the breaker in a crowbar ov protection system. But they are NOT substitutes for fuses. They do have good and useful applications where the physics of the risk so indicates. Bob . . . ________________________________ Message 3 _____________________________________ Time: 09:50:23 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Re: Odyssey Batteries At 06:38 PM 10/10/2019, you wrote: > >Yes that is the document for reconditioning. It >does not discuss the most common cause of >decreased capacity. I didn't search for the >discussion, but recall quite a bit about folks >on Vans Air Force experiencing very short life, >say under 2 yrs, with Odyssey batteries from >using maintainers that were not optimized for AGM batteries. Color me skeptical . . . On one hand, svla batteries and 'pure lead' products are marketed as the super- robust direct replacement for flooded cell batteries. Quoting from their website: Emacs! They go to great lengths to promote maintenance-free features of the gas-recombinant chemistry. I don't know what that 'overall power' quality is. On the other hand, I observe no disclaimer stating that "3 times the life" can only be achieved by visiting this website where we read: "BatteryMINDers=AE from VDC Electronics are guaranteed to double or triple the life of most batteries while improving their performance. To suggest that a battery maintainer should be "optimized" for AGM is not supported by the numbers. A pre-mature failure of a battery stored on a maintainer calls for verification the maintainer's ability to support ANY battery. I've owned dozens of SVLA batteries of all sizes that were maintained on generic Batter Minders/Battery Tenders for YEARS with no appreciable loss of capacity much less total failure. I recall an Enersys admonition some years back suggesting that their house holy-watered maintainer should be used to optimize service life of their products. But like all medicine-show promotions, they offered no numbers or operational profiles explaining how their maintainer differed from a Battery Tender or a Schumacher product. Nor did they offer any explanation of the differential physics of AGM vs. flooded that begged for special treatment. Battery failure is an inarguable fact . . . but too often, deduction of cause- effect-and-remedy are not supported by the physics. Suspicion is warranted when conflicting philosophies are offered by factions of the same industry. Good example: There's a constellation of battery 'desulfation' devices on the market, some are even patented. Still more variants are described in popular DIY literature. Each claims to apply the 'magic' hammer that breaks up lead-sulfate molecules thus restoring teh battery's original function. To date, I've seen no laboratory study on the efficacy of any particular technique. A few months ago, I purchased a Battery Minder Plus . . . https://tinyurl.com/y2gtxl7q . . . fellow Lister Steve Stearns sent me a soggy svla battery as a test article for evaluating my new purchase. I've been doing short and long (5 mos) term testing and will publish the results when I get time . . . don't expect any fireworks or joyous bell ringing. In the mean time, if you've got a battery maintainer of ANY stripe, don't pitch it to buy some super- whizzy battery maintenance product. Measure the terminal voltage of your 'stored' battery after say, a week or more on your existing maintainer. If the voltage is 12.9 to 13.4 then it's just fine . . . no matter what kind of lead-acid battery you have. I just checked Steve's test article after 3+ months . . . it's 13.19 volts. I think the 'new and improved' Battery Minder is probably an adequate maintainer . . . but its restorative qualities, if any, are yet to be demonstrated. 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.