X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 03 Aug 2011 16:56:54 -0400 Message-ID: X-Original-Return-Path: Received: from raven.ravenwebhosting.com ([72.9.254.67] verified) by logan.com (CommuniGate Pro SMTP 5.4.1) with ESMTPS id 5080757 for lml@lancaironline.net; Wed, 03 Aug 2011 11:39:17 -0400 Received-SPF: none receiver=logan.com; client-ip=72.9.254.67; envelope-from=paul@tbm700.com Received: from 47-61.202-68.tampabay.res.rr.com ([68.202.61.47]:53709 helo=[192.168.1.106]) by raven.ravenwebhosting.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.69) (envelope-from ) id 1QodWs-0000CJ-0G for lml@lancaironline.net; Wed, 03 Aug 2011 11:38:42 -0400 From: paul miller Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-1--928730218 Subject: Re: [LML] This is puzzling ..and not only me... X-Original-Date: Wed, 3 Aug 2011 11:38:38 -0400 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <877B2D11-0CB3-4890-909E-FE109ED0A5E5@tbm700.com> X-Mailer: Apple Mail (2.1084) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - raven.ravenwebhosting.com X-AntiAbuse: Original Domain - lancaironline.net X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tbm700.com X-Source: X-Source-Args: X-Source-Dir: --Apple-Mail-1--928730218 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Ronald: That's probably because you're not generating 100a during taxi = and you are draining the battery during taxi with the AC running. Your = battery is supplying the AC amps during idle. When you runup it will = boost the amps and voltage again which is recharging the battery and = supplying the AC so you'll get the higher amps (85). I think I would = look at whether there is a net drain on the battery and how much you = wish to exercise the Alternator this way relative to the rated capacity. = Typically, I've seen manuals suggesting that 70-80% of the rated = current for the alternator is a good maximum output in steady state and = I just don't know how hot that thing will get on the ground producing 85 = amps. You could try to reduce the load on the battery to a minimum by = turning off secondary loads until you are on your way and the battery is = back up and the alternator has come off the highest loads. Breaker limits can move over time and open after extended periods at or = near the rated current. It may be close to its rated capacity or it may = be failing on the safe side. I would test it or replace it with the = proper rating and see if that changes anything. I would not continue to = reset it without establishing the cause because many headlines have come = from resetting circuit breakers. They are cheap and easy to work with. = Come by the hangar if you want to talk about it. Paul Spruce Creek >=20 > In flight when the AC is running (cruise) my amps are around 44amps. = Sometimes it goes to 60amps, this is when the AC kicks in again. >=20 > The puzzling part is, why it goes all the way to 85amps and than goes = back again on the run up? I hope to trigger some Ideas here. > I am having problems that my breaker from the AC pops after about = 15-20min after start. >=20 > Many thanks =3D=3D Ronald --Apple-Mail-1--928730218 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii