Return-Path: Received: from pop3.olsusa.com ([63.150.212.2] verified) by logan.com (CommuniGate Pro SMTP 3.5.4) with ESMTP id 1046697 for rob@logan.com; Fri, 15 Feb 2002 05:37:17 -0500 Received: from gull.prod.itd.earthlink.net ([207.217.120.84]) by pop3.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-71866U8000L800S0V35) with ESMTP id com for ; Fri, 15 Feb 2002 03:30:16 -0500 Received: from sdn-ar-012orportp315.dialsprint.net ([63.180.48.93] helo=f3g6s4) by gull.prod.itd.earthlink.net with smtp (Exim 3.33 #1) id 16bdnF-000096-00 for lancair.list@olsusa.com; Fri, 15 Feb 2002 00:32:34 -0800 Message-ID: <000a01c1b5fb$ac47f420$5d30b43f@f3g6s4> Reply-To: "Dan Schaefer" Reply-To: lancair.list@olsusa.com From: "Dan Schaefer" To: "Lancair list" Subject: Re: Batteries Date: Fri, 15 Feb 2002 00:35:05 -0800 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit X-Mailing-List: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> I seldom disagree with Brent, and this probably doesn't qualify as a big disagreement, however (there's always a "however"), there is a big caveat if you set your charge voltage at the battery terminals, e.g., do this only when the battery is fully charged (drawing near zero charge current) or, if both regulator sensing leads are connected directly at the battery terminals (or at least, right after the battery contactor for the positive sense). The reason logic tells one to make the measurement at the battery terminals is to account for the voltage drop in the cables from the alternator to the battery. Sounds sensible at first glance but as the battery comes up to full charge and the charging current decreases, the drop in the cables also decreases in proportion to the decreased current. Eventually, as the battery attains full charge and the current drops to near zero, so will the cable voltage drop and the battery will see whatever voltage the alternator regulator is set for. So, set your voltage when charge current is close to zero or move the regulator sense leads to the point you want an accurate and stable voltage (at the battery) and let the voltage drop in the cable take care of itself. Dan Schaefer >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://members.olsusa.com/mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please remember that purchases from the Builders' Bookstore assist with the management of the LML. Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>