X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 09 Dec 2005 12:36:38 -0500 Message-ID: X-Original-Return-Path: Received: from mta13.adelphia.net ([68.168.78.44] verified) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 869469 for lml@lancaironline.net; Fri, 09 Dec 2005 08:21:48 -0500 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.44; envelope-from=glcasey@adelphia.net Received: from [70.34.70.106] by mta13.adelphia.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20051209132056.NVCB28251.mta13.adelphia.net@[70.34.70.106]> for ; Fri, 9 Dec 2005 08:20:56 -0500 Mime-Version: 1.0 (Apple Message framework v733) In-Reply-To: References: Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed X-Original-Message-Id: <987F58A4-B3D9-48ED-B173-FBFF0A3C6F71@adelphia.net> Content-Transfer-Encoding: 7bit From: Gary Casey Subject: Re: [LML] LNC2 Battery, LSE Backup Battery poser X-Original-Date: Fri, 9 Dec 2005 05:20:53 -0800 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.733) > Check with the installer of car audio systems. They use multiple > battery > installations on the big systems. I got an apparatus that directs > charge from > the alternator to whichever battery needs charge without > overcharging either > one. It is called an isolator. Most of these "isolators" are actually two sets of diodes. One feeds one battery and the other feeds the second. The sense wire for the voltage regulator should then be taken to the battery side. Therefore both batteries see the same voltage drop and they will be charged equally. It is not a particularly elegant solution since there is a constant voltage drop in the system, dissipating significant power - hence the large heat sink. It works, though. Gary Casey