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Date: Wed, 07 Dec 2005 00:14:57 -0500
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From: John Huft <aflyer@lazy8.net>
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Subject: Re: [LML] Re: LNC2 Battery, Electronic Ign (LSE) Backup Battery and
 an Intere...
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Sky2high@aol.com wrote:
> In a message dated 12/3/2005 10:11:50 P.M. Central Standard Time, 
> marv@lancaironline.net writes:
> 
>     To answer your question, I think the back-up battery is suffiecently
>     charged
>     through the diode. 
> 
> John,
>  
> As usual, Experimental airplanes are interesting in the different 
> schemes used to meet different objectives.
>  
> What is the voltage you measure at aux V as the secondary battery 
> charging level?

My "Aux" battery settles out at 14.2 Volts (.3 Volts below the Main, 
measured with the same voltmeter). I am assuming that 14.2 will be good 
enough for a reasonable charge.

Since I can switch off the charging current, I can test this battery 
while on a cross country by running it for an hour or so and watching 
the voltage on the battery. Then I can recharge it before landing.


>  
> What I am looking for is a Battery-Tender like device to slow charge 
> and maintain a STANDBY battery at the appropriate float voltage and 
> that operates from a 12-14 VDC power supply rather than 120 VAC. This 
> would properly keep such a standby battery ready for use when needed.
>  
The two ways you can do this are

a.) Have a second alternator with second regulator

b.) Have a switching power supply that will run off a 12-14 volts input, 
that has a micro controlled battery charge function like

http://www.batterymart.com/battery.mv?c=12vbatterydefender

except that it runs off a 12V dc input. It can be done, but I don't know 
of any on the market.


> Scott Krueger AKA Grayhawk
> Lancair N92EX IO320 SB 89/96
> Aurora, IL (KARR)
> 
> Merry Christmas to all!
> 
> 
> 
Have fun! John