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brucejolene(at)iowateleco
Guest

Posted: Sun Oct 05, 2008 4:01 am Post subject: Battery

What size of battery is recommended for the Ktfox III in cold cranking amps?



Bruce

Kitfox III

490PA

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Sun Oct 05, 2008 6:46 am Post subject: Battery

At 04:59 AM 10/5/2008, you wrote:

 	  Quote: 	
		  What size of battery is recommended for the Ktfox III in cold cranking amps?


	


Bruce,

         You don't say what engine. (That's why we put all that stuff 

in the signature.) I use an 18ah sealed lead acid battery 

(http://www.batterymart.com/p-12v-18ah-sealed-lead-acid-battery-1.html) 

in my IV with a 582. It works well. I couldn't find the CCA for it, though.

Guy Buchanan

San Diego, CA

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

paul(at)eucleides.com
Guest

Posted: Sun Oct 05, 2008 4:54 pm Post subject: Battery

On Sun, October 5, 2008 4:59 am, Bruce Jolene wrote:

 	  Quote: 	
		   



 What size of battery is recommended for the Ktfox III in cold cranking amps?




	


There's more to sizing a battery than starter loads.



Your source for this is Bob Nuckolls of the Aero-Electric Connection:



<http://www.aeroelectric.com/>



Here's a list of some of the relevant articles on that site.



<http://tinyurl.com/4urcc4>



Briefly, Bob's recommendation is to determine first the total battery reserve you need

in ampere-hours. Then use two (smaller) batteries each with about half that capacity.

Then you stagger the replacement of the batteries for half the useful life. So if the

useful life for 60% capacity is 3 years then you replace one of the batteries every 18

months. Then you always have the determined electrical reserve to operate should the

alternator fail.



The starter requirement will likely be met using this sizing scheme but once that is

determined, verify that you have enough with the two batteries.



-- 

Paul A. Franz, P.E.

PAF Consulting Engineers

Office 425.440.9505

Cell 425.241.1618

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