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Battery Size

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rene(at)felker.com
Guest

Posted: Sat Dec 13, 2008 1:12 pm Post subject: Battery Size

Some background.  As I was building.........I was worried about the CG being

to far forward and thus I was not concerned about putting in a bigger

battery (Odyssey 925 at 24 LBS) and my O2 system behind the rear bulkhead.

In the end, that left my empty weight CG at 109.22, which is pretty far aft.

My first annual is due in Jan and thus I am considering options for moving

the CG forward.  I have a little more interior work to do, but I do not

think it will have any affect.  



One of the options I am considering in moving the battery from the normal

location behind the bulkhead and mounting it on the firewall.  My rough

calculation is the empty weight CG will move to 107.58 a little forward of

the forward edge of the envelope. (this does not include some of the wiring

changes which will also move the CG a little forward also.....).



So here is the real question, anyone flying out there with just one PC680

battery?  If so have you found it adequate?  I am a little like Tim

Taylor....why use a 680 anmp battery when you can get a 925 amp battery, but

do I need all of that power.



I have a standby alternator (8 amp) and a backup battery for my Alamo

instruments (AS, Altimeter and ADI).  So I am not to worried about the loss

of the primary altinator



Anybody have any other ideas?



Rene'

801-721-6080

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carl.froehlich(at)cox.net
Guest

Posted: Sat Dec 13, 2008 1:36 pm Post subject: Battery Size

If it works for your CG, another option is to use two identical but smaller

batteries, one aft one forward.  These would replace your one big battery

and your small backup battery.  Run them in parallel for normal ops, split

if you have an problem on one side.  PC-625s are more than adequate for

starting.  My normal maintenance is to replace one battery every other year.

The old ones end up in law tractors and such - still going strong years

later.



Carl Froehlich

RV-8A (450 hrs)

RV-10 (fuselage)



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kdbelue(at)charter.net
Guest

Posted: Sat Dec 13, 2008 3:03 pm Post subject: Battery Size

Rene,



I have 2 PC680 batteries in my RV10. One is for the main bus and the other 

is backup and for the EFIS to boot on during start. I can switch in both 

batteries for start if needed. My experience has been that 1 PC680 starts my 

RV-6A just fine, but it's not really enough for the IO540. It will start it 

but sometimes I have to use both batteries when it is cold and it still just 

barely gets it started. I'm using a skytec PM starter, so I different 

starter might help.



Kevin Belue

RV-6A Flying

RV-10 Flying

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Sat Dec 13, 2008 4:55 pm Post subject: Battery Size

Skytec PM starters have about the highest current draw out there. The NL 

series takes maybe 10-20% less, and the Kelly E-drive takes about 1/2 

the current of the Skytec PM.



Kevin Belue wrote:

[quote] 



 Rene,



 I have 2 PC680 batteries in my RV10. One is for the main bus and the 

 other is backup and for the EFIS to boot on during start. I can switch 

 in both batteries for start if needed. My experience has been that 1 

 PC680 starts my RV-6A just fine, but it's not really enough for the 

 IO540. It will start it but sometimes I have to use both batteries 

 when it is cold and it still just barely gets it started. I'm using a 

 skytec PM starter, so I different starter might help.



 Kevin Belue

 RV-6A Flying

 RV-10 Flying

 ---

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_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

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