Sender: <marv@lancaironline.net>
To:  lml@lancaironline.net
Date: Thu, 24 Oct 2013 12:46:45 -0400
Message-ID: <redirect-6563215@logan.com>
Received-SPF: pass
 receiver=logan.com; client-ip=206.46.173.7; envelope-from=n5zq@verizon.net
From: "Bill Harrelson" <n5zq@verizon.net>
References: <list-6562744@logan.com>
In-reply-to: <list-6562744@logan.com>
Subject: Re: [LML] Re: Odyssey PC680 Batteries on Firewall -- Cool Enough?
MIME-version: 1.0
Content-type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original
Content-transfer-encoding: 7bit
Importance: Normal

Jeff,

How did you terminate the aluminum cables? They require special lugs. You 
can't put the standard copper terminals on AL cable. Could this interface be 
where your high resistance is?

Bill Harrelson
N5ZQ 320 2,150 hrs
N6ZQ  IV 400 hrs


Chris,

The back battery (behind the aft bulkhead) does have a trickle drain via the 
panel's clock.  This is why the voltage trickles down over time (days, 
weeks) relative to the isolated battery on the firewall.  My observation is 
independent of this variable.

But when both batteries are fully charged, either with dual alternator 
outputs or plug-in charger, the delta is 1.2V to 1.3V as seen at nearly the 
same point behind the panel.

I had originally planned for copper cables, and measured the drop based on 
6ft, but found the weight to high.  Aluminum is used, and the drop is 
significantly greater than copper (as we know), and the result of roughly 
6ft of 2 gauge is 1.2-1.3V demonstrated.

If this were the cranking battery, it has an impact on amps available tot he 
starter, which is another 3-4 ft further forward.  When I have experimented 
with cranking off the aft battery, it definitely is weaker, a problem if 
cold start.

Jeff