---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 09/09/19: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:43 AM - Re: Aux Battery Idea Was: Speaking of Aux Batteries (user9253) 2. 10:08 AM - Re: Aux Battery Idea Was: Speaking of Aux Batteries (Robert L. Nuckolls, III) 3. 12:00 PM - Re: Re: Aux Battery Idea Was: Speaking of Aux Batteries (David Saylor) 4. 01:03 PM - Re: Aux Battery Idea Was: Speaking of Aux Batteries (David Saylor) 5. 04:00 PM - Re: Safety For Electrical System Workers Essay (CaptainCaptain) 6. 05:10 PM - Re: Re: Aux Battery Idea Was: Speaking of Aux Batteries (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 04:43:51 AM PST US Subject: AeroElectric-List: Re: Aux Battery Idea Was: Speaking of Aux Batteries From: "user9253" The starter contactor is normally energized by switching the positive wire. It is dangerous to switch the negative wire. If that wire ever gets shorted to ground, the starter motor will spin the prop, causing damage or injury. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=491247#491247 ________________________________ Message 2 _____________________________________ Time: 10:08:20 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Aux Battery Idea Was: Speaking of Aux Batteries > >Here's a work in progress.=C2 Obviously not >complete, no alternator shown, lot's of detail >omitted, etc, but the starter contactor power is >shown.=C2 That's the key, unless I'm missing something. There are no 'timing' issues with using a second battery for brownout protection. Consider Z-35 for second battery and simply leaving the aux battery relay open until after the engine is running. Bob . . . ________________________________ Message 3 _____________________________________ Time: 12:00:55 PM PST US From: David Saylor Subject: Re: AeroElectric-List: Re: Aux Battery Idea Was: Speaking of Aux Batteries Good point, and easy enough. Thanks! On Mon, Sep 9, 2019 at 4:48 AM user9253 wrote: > > The starter contactor is normally energized by switching the positive wire. > It is dangerous to switch the negative wire. If that wire ever gets > shorted > to ground, the starter motor will spin the prop, causing damage or injury. > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=491247#491247 > > ________________________________ Message 4 _____________________________________ Time: 01:03:23 PM PST US From: David Saylor Subject: Re: AeroElectric-List: Aux Battery Idea Was: Speaking of Aux Batteries Thanks Bob, What is the cost of accidently leaving the aux battery on during start? Is it just a sag, or does starter-sized current try to run through the small relay and associated wiring? If the main is weak, will the aux battery work that much harder? I'm concerned that a relatively simple mistake like leaving the aux batt on during start will do some damage. (I've put switches in the wrong position before...) --Dave On Mon, Sep 9, 2019 at 10:13 AM Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > > Here's a work in progress.=C3=82 Obviously not complete, no alternator s hown, > lot's of detail omitted, etc, but the starter contactor power is shown. =C3=82 > That's the key, unless I'm missing something. > > > There are no 'timing' issues with using > a second battery for brownout protection. > Consider Z-35 for second battery and > simply leaving the aux battery relay > open until after the engine is running. > > > Bob . . . > ________________________________ Message 5 _____________________________________ Time: 04:00:55 PM PST US Subject: AeroElectric-List: Re: Safety For Electrical System Workers Essay From: "CaptainCaptain" When I saw the theme, I couldn't imagine what students should write about. I would probably solve this problem with ordering this essay on https://www.myassignmentwriting.com.au/ and I know that it is not very cheap but most of the students actually can afford such services I think. Most likely. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=491258#491258 ________________________________ Message 6 _____________________________________ Time: 05:10:36 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Aux Battery Idea Was: Speaking of Aux Batteries At 01:58 PM 9/9/2019, you wrote: >Good point, and easy enough.=C2 Thanks! 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