REFLECTOR: Odyssey Battery

[Douglas Holub]

I'm using two PC680s in series for a 28 volt system.

Doug Holub
----- Original Message ----- 
From: <jewen at comporium.net>
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Sent: Wednesday, May 09, 2007 10:01 PM
Subject: Re: REFLECTOR: Odyssey Battery


> The PC680s seem to be rather popular.  Depending on your load
> requirements, you may also want to consider the PC925 it is 28 Ah.  It is
> a tight fit, but it does fit in my 173 RG.  In fact I wil be using 2, one
> stacked on top of the other.  My loads may be a bit higher than normal
> (ECU on an auto conversion, Glass Cockpit computer, and IFR) so I want all
> the Ah I can fit.  The 925 only costs $25 to $30 more than the 680, so in
> my case I will be a bit  more comfortable with the extra reserve.  And I
> may not need ballast when flying solo.  Your mileage may vary.
>
> Joe
>
>
> On Wed, May 9, 2007 6:09 pm, John Tvedte wrote:
>> Chuck,
>>
>>
>> A B&C is a wound field starter - just like the inline high-torque
>> Skytecs....
>>
>>
>> The internal resistance of the AGM PC680 is very low - so it can provide
>> high currents.
>>
>> I think you will find the combination of the B&C and PC680 (assuming #2
>> wire) will start your engine just fine.  That said - I think one needs to
>> take into account what Pat said about OAT being zero, etc.
>>
>> Load analysis is what I suggest you think about - how much current are
>> you drawing  - during your mission - assuming IFR - and you have
>> alternator failure... is 17Ah at that point enough.... capacity testing
>> that battery?  Notice that the Ah rating depends upon how fast of current
>> draw - 20hr rate vs 100hr rate)
>>
>> In my case, I'm using a dual battery setup - and can cross feed - so 2
>> PC680's.... 30.8lbs of battery....
>>
>>
>> I'm not flying -
>>
>>
>> John
>> XL-FG
>>
>>
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>
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