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Date: Mon, 02 Nov 2009 15:32:41 -0500
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From: "Bill Wade" <super_chipmunk@roadrunner.com>
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Subject: Re: [LML] Re: L-IVP Battery Cooling
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  Both of my planes have the battery located behind the rear seats, with 
long wire runs and no protection. The relays are mounted close to the 
battery boxes and both have aluminum fuselages so that the potential for 
shorting of the positive lead is much greater than on a composite fuselage.

  In the Navion for example, North American used #2 battery wires (14V 
system). The next largest wires are #10 (charging circuit) and the vast 
majority of the wiring is #18. It seems to me that everything else would 
burn out before the battery wires. Lancair wisely doesn't spec wire sizes 
but I imagine a typical system would have similar size relationships.

  In a composite fuselage there is a need to run two heavy-gauge battery 
wires, one for positive and one for ground. The Velocity had the battery 
location in the nose for W&B so both cables had to be sized to carry 14V 
starter current the full length of the fuselage. That's an extreme but it 
shows what can be done.

  The only way the battery cables could get fried in a composite fuselage 
would be for them to short together and it shouldn't be difficult to provide 
adequate separation. I've heard much mention of failure points before and I 
suspect that putting a fuse into the system would create several. Although 
I'm years away from this issue I think the only drawback to a remote 
location is the extra weight of the longer cables and perhaps W&B 
oncerns.  -Bill Wade


----- Original Message ----- 
From: "Colyn Case at earthlink" <colyncase@earthlink.net>
To: <lml@lancaironline.net>
Sent: Sunday, November 01, 2009 7:01 PM
Subject: [LML] Re: L-IVP Battery Cooling


> Bill,
> I just looked at that too.
> My conclusion was that fusing the starter was possible but difficult 
> (takes
> an expensive and very large cooper-bussman very slow-blow fuse).
> But fusing the main battery bus (the part that starter current doesn't go
> through)  is very doable with an ANL.
> I don't know if that helps your situation.  If your whole power grid is in
> the back it won't.  but if the rest of it is up front, it would help 
> protect
> those long wires against anythong other than the starter misbehaving.
> ANL data-sheet attached.
>
> Colyn
>
>
> ----- Original Message ----- 
> From: "billhogarty" <billhogarty@hughes.net>
> To: <lml@lancaironline.net>
> Sent: Saturday, October 31, 2009 4:17 PM
> Subject: [LML] L-IVP Battery Cooling
>
>
>> Ralf:
>>
>> I also have the A/C compressor option that required me to move the
>> battery.  I looked at mounting it above the turbo controller but was
>> afraid of cooking the battery so I just moved  it to the  luggage
>> compartment.
>>
>> I also moved the master relay and mounted it right on the battery box.  I
>> did considered fusing the longer battery cable but decided against it.  I
>> think that Honda tried a battery fuse years ago with poor results.
>> Anyway, no problems so far.
>>
>> Regards, Bill Hogarty
>>
>> --
>> For archives and unsub
>> http://mail.lancaironline.net:81/lists/lml/List.html
>


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