---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 07/11/10: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:38 PM - Deceptive Voltage? () 2. 04:44 PM - Another battery maintainer/charger question (edleg) 3. 05:19 PM - Re: Another battery maintainer/charger question (Neal George) ________________________________ Message 1 _____________________________________ Time: 03:38:17 PM PST US From: Subject: AeroElectric-List: Deceptive Voltage? 7/11/2010 Hello Bob Nuckolls and other Electrical Gurus, Suppose you ran your battery down by spinning your first time to be started O-540 Lycoming engine with the starter in order to preoil the engine in your nearly finished RV-10. And maybe you did some other things that ran the battery down. Then you connected your small amperage output battery charger to the battery and you attempted to start the Shower of Sparks equipped engine without success. The engine was cranked OK, but the starting vibrator just was not putting out. A check of the system voltage in appropriate points with a separate volt meter while cranking the engine showed 13 plus volts. Is it possible that the voltage being seen was in fact the voltage being put out by the battery charger as it attempted to recharge the run down battery, but the amperage being put out by the run down battery and battery charger together just was not enough current flow to run the starting vibrator as well as crank the engine? 'OC' Baker Says: "The best investment we can make is the time and effort to gather and understand knowledge." ________________________________ Message 2 _____________________________________ Time: 04:44:41 PM PST US Subject: AeroElectric-List: Another battery maintainer/charger question From: "edleg" This subject is off topic of building/running airplanes, but it is still an interesting (to me, anyways) question/subject. One of my hobbies that gets in the way of aircraft building is my long time ham radio interests. I recently obtained a new RV/Marine deep cycle battery to provide emergency 12vdc power for my vhf/uhf station and hf station on low power. I bought a nice battery box to put the thing in (a rather heavy battery -- "105 Ahr"). Mounted a small dc-to-ac inverter on the lid along with some 12vdc outlets and also a new Schumacher SE-1-12s (1.5 amp) maintainer/charger. Everything works fairly well except for two troubling things: 1. the maintainer/charger is very loud, even in the maintainer mode -- actually louder than my other two regular 6/2 amp and 10/2 amp battery chargers. 2. the "float" voltage that is maintained is at 12.96 vdc as measured by two different digital (fluke brand) volt meters. Seems a little bit low when reading the other posts here. So... Bob and the other electron experts: is there a relatively (physically) small maintainer/charger that doesn't always sound like a loud battery charger (oxymoron???) when in the maintainer mode, and is the float voltage high enough? Thanks, -Ed- NX6ED Read this topic online here: http://forums.matronics.com/viewtopic.php?p=304520#304520 ________________________________ Message 3 _____________________________________ Time: 05:19:36 PM PST US From: "Neal George" Subject: RE: AeroElectric-List: Another battery maintainer/charger question Ed - My little Schumacher 1562 1.5-amp charger/maintainer is silent - at least, if it makes any noise, I've never noticed it, even in the wee hours with the house & shop quiet. Neal N8ZG -----Original Message----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of edleg Everything works fairly well except for two troubling things: 1. the maintainer/charger is very loud, even in the maintainer mode -- actually louder than my other two regular 6/2 amp and 10/2 amp battery chargers. 2. the "float" voltage that is maintained is at 12.96 vdc as measured by two different digital (fluke brand) volt meters. Seems a little bit low when reading the other posts here. So... Bob and the other electron experts: is there a relatively (physically) small maintainer/charger that doesn't always sound like a loud battery charger (oxymoron???) when in the maintainer mode, and is the float voltage high enough? Thanks, -Ed- NX6ED ------------------------------------------------------------------------------------- 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.