AeroElectric-List Digest Archive

Tue 03/28/06


Total Messages Posted: 4



Today's Message Index:
----------------------
 
     1. 06:03 AM - Re: Re: Battery charging (Robert L. Nuckolls, III)
     2. 06:03 AM - Re: Two batteries and one alternator (Robert L. Nuckolls, III)
     3. 02:13 PM - Re: Two batteries and one alternator (Sam Marlow)
     4. 05:36 PM - Re: Two batteries and one alternator (Robert L. Nuckolls, III)
 
 
 


Message 1


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    Time: 06:03:30 AM PST US
    From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
    Subject: Re: RE: Battery charging
    --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> At 11:35 AM 3/24/2006 -0800, you wrote: >--> AeroElectric-List message posted by: "James Foerster" ><jmfpublic@comcast.net> > >Bob said: > > "There's a lot of myth and misunderstanding about the performance one > can expect both in the charging and discharging of paralleled batteries. > If your alternator and voltage regulator are doing their job, ALL > batteries > of ANY size will be serviced to their individual needs. When discharging > paralleled batteries, you will have access to 100% of energy available > from the sum total of energy stored irrespective of size or condition > of the individual batteries." > >This presumes identical battery chemistry. It would be uncertain that >charge requirements would be identical for an adsorbed glass mat (AGM) and >a gel cell, for example. The flooded battery type would be yet another >voltage point. Some battery chargers have a switch to choose the battery >type. Recall that the specific gravity of the battery acid used to >activate aircraft flooded cells in higher than that used for cars, and >that the specific gravity of sufuric acid in a sealed AGM battery is >dependent on the choice of the manufacturer. I suspect that the biggest >difference in charge voltage is between those >handy-available-in-smaller-size gel cells, and the AGM and flooded cell >batteries, which are more similar. The gel cell is a nice, low current >drain type of cell, but it may not parallel well with the other types. Why would one put a gel cell in an airplane? When we certified the Gates Genesis series RG batteries into TC aircraft the cold cranking test results were profound. After cold soaking new gel, flooded, and RG batteries in the deep freeze overnight (about -10F), each battery was subjected to a 300A constant current load for 15 seconds and terminal voltage plotted. The RG battery had higher terminal voltage AFTER 15 seconds than the flooded battery STARTED with. The gel wouldn't deliver 300A at any useful voltage. All three batteries would crank an engine nicely at room temp but the cold weather performance differences made it a hands-down decision as to the superior technology for service in aircraft. Bob . . . < What is so wonderful about scientific truth...is that > < the authority which determines whether there can be > < debate or not does not reside in some fraternity of > < scientists; nor is it divine. The authority rests > < with experiment. > < --Lawrence M. Krauss >


    Message 2


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    Time: 06:03:30 AM PST US
    From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
    Subject: Re: Two batteries and one alternator
    --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> At 10:54 AM 3/24/2006 -0600, you wrote: >--> AeroElectric-List message posted by: "Clint \"Sandy\" McNabb" ><mink@cebridge.net> > > >I'm going to use two batteries and one alternator. Can anyone direct me to >where I can get a good schematic? I don't see one in AeroElectric >Connection. You can add a second battery to ANY system as shown in Figure Z-30 of http://aeroelectric.com/articles/Rev11/AppZ_R11F.pdf Bob . . . < What is so wonderful about scientific truth...is that > < the authority which determines whether there can be > < debate or not does not reside in some fraternity of > < scientists; nor is it divine. The authority rests > < with experiment. > < --Lawrence M. Krauss >


    Message 3


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    Time: 02:13:57 PM PST US
    From: Sam Marlow <sam.marlow@adelphia.net>
    Subject: Re: Two batteries and one alternator
    --> AeroElectric-List message posted by: Sam Marlow <sam.marlow@adelphia.net> How does the second battery get charged if the aux bat switch is open, or do you operate normally with it closed, (on)? Robert L. Nuckolls, III wrote: >--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> > >At 10:54 AM 3/24/2006 -0600, you wrote: > > > >>--> AeroElectric-List message posted by: "Clint \"Sandy\" McNabb" >><mink@cebridge.net> >> >> >>I'm going to use two batteries and one alternator. Can anyone direct me to >>where I can get a good schematic? I don't see one in AeroElectric >>Connection. >> >> > > You can add a second battery to ANY system as shown in Figure > Z-30 of http://aeroelectric.com/articles/Rev11/AppZ_R11F.pdf > > Bob . . . > > > < What is so wonderful about scientific truth...is that > > < the authority which determines whether there can be > > < debate or not does not reside in some fraternity of > > < scientists; nor is it divine. The authority rests > > < with experiment. > > < --Lawrence M. Krauss > > > > > > > > > >


    Message 4


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    Time: 05:36:38 PM PST US
    From: "Robert L. Nuckolls, III" <nuckollsr@cox.net>
    Subject: Re: Two batteries and one alternator
    --> AeroElectric-List message posted by: "Robert L. Nuckolls, III" <nuckollsr@cox.net> At 05:05 PM 3/28/2006 -0500, you wrote: >--> AeroElectric-List message posted by: Sam Marlow <sam.marlow@adelphia.net> > >How does the second battery get charged if the aux bat switch is open, >or do you operate normally with it closed, (on)? Yes, normal operations are with all battery contactor(s) closed. All batteries can usually help crank. All batteries can charge from the single alternator. It's only when the low voltage warning light comes on that you open battery contactors to isolate each battery to it's "plan-b" duties. Bob . . . >Robert L. Nuckolls, III wrote: > > >--> AeroElectric-List message posted by: "Robert L. Nuckolls, III" > <nuckollsr@cox.net> > > > >At 10:54 AM 3/24/2006 -0600, you wrote: > > > > > > > >>--> AeroElectric-List message posted by: "Clint \"Sandy\" McNabb" > >><mink@cebridge.net> > >> > >> > >>I'm going to use two batteries and one alternator. Can anyone direct me to > >>where I can get a good schematic? I don't see one in AeroElectric > >>Connection. > >> > >> > > > > You can add a second battery to ANY system as shown in Figure > > Z-30 of http://aeroelectric.com/articles/Rev11/AppZ_R11F.pdf > > > > Bob . . . > > > > > > > > < What is so wonderful about scientific truth...is that > > > < the authority which determines whether there can be > > > < debate or not does not reside in some fraternity of > > > < scientists; nor is it divine. The authority rests > > > < with experiment. > > > < --Lawrence M. Krauss > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > >-- > > Bob . . . < What is so wonderful about scientific truth...is that > < the authority which determines whether there can be > < debate or not does not reside in some fraternity of > < scientists; nor is it divine. The authority rests > < with experiment. > < --Lawrence M. Krauss >




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