---- START NEW MESSAGE --- Received: from cherry.ease.lsoft.com [209.119.0.109] by dpmail10.doteasy.com with ESMTP (SMTPD32-8.05) id A26127A0068; Thu, 29 Jan 2004 20:49:37 -0800 Received: from PEAR.EASE.LSOFT.COM (209.119.0.19) by cherry.ease.lsoft.com (LSMTP for Digital Unix v1.1b) with SMTP id <20.00CC3F7C@cherry.ease.lsoft.com>; Thu, 29 Jan 2004 23:49:26 -0500 Received: from MITVMA.MIT.EDU by MITVMA.MIT.EDU (LISTSERV-TCP/IP release 1.8e) with spool id 9751 for PICLIST@MITVMA.MIT.EDU; Thu, 29 Jan 2004 23:49:17 -0500 Received: from MITVMA (NJE origin SMTP@MITVMA) by MITVMA.MIT.EDU (LMail V1.2d/1.8d) with BSMTP id 5425; Thu, 29 Jan 2004 23:49:07 -0500 Received: from mailhub-4.iastate.edu [129.186.140.14] by mitvma.mit.edu (IBM VM SMTP Level 430) via TCP with ESMTP ; Thu, 29 Jan 2004 23:49:06 EST X-Comment: mitvma.mit.edu: Mail was sent by mailhub-4.iastate.edu Received: from mailout-2.iastate.edu (mailout-2.iastate.edu [129.186.140.2]) by mailhub-4.iastate.edu (8.12.10/8.12.10) with SMTP id i0U4n74t020852 for ; Thu, 29 Jan 2004 22:49:07 -0600 Received: from hike.student.iastate.edu(65.110.233.166) by mailout-2.iastate.edu via csmap id c339c72a_52df_11d8_889b_00304811d932_30788; Thu, 29 Jan 2004 22:50:01 -0600 (CST) References: <20040129215352.735cee92.sunkist@iastate.edu> <40196E1A.19721.8828D6@localhost> X-Mailer: Sylpheed version 0.9.0claws (GTK+ 1.2.10; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Message-ID: <20040129224750.191b1981.sunkist@iastate.edu> Date: Thu, 29 Jan 2004 22:47:50 -0600 Reply-To: pic microcontroller discussion list Sender: pic microcontroller discussion list From: Eric Christensen Subject: Re: [EE]: High current PCB To: PICLIST@MITVMA.MIT.EDU In-Reply-To: <40196E1A.19721.8828D6@localhost> Precedence: list X-RCPT-TO: Status: U X-UIDL: 371856436 Yeah, He's looked at several commercially available dual-battery systems and a variety of relays/contactors. Many of the commercially available systems he saw were only rated for a 100 to 200 amps, and he wants to stay away from an electro-mechanical setup that could be prone to arcing damage. Also, this is a project vehicle, so even if building a custom dual-battery system may not be the most practical choice, this is a one off project that is kind of neat. It also gives him the flexibility to build it to his own specifications, if he can find a way to easily and reliably connect the MOSFETs :) Eric On Thu, 29 Jan 2004 20:33:30 -0800 Bob Blick wrote: > On 29 Jan 2004 at 21:53, Eric Christensen wrote: > > A friend of mine is building a dual battery system for his custom off-road > > truck. His truck has a somewhat hard-starting chevy 350 engine and a > > failure-prone electrical system. He wants to have a second battery that is > > not normally connected to the system so that it won't be run dead in an > > electrical failure. He then wants to be able to connect either battery to > > the engine individually or both in parallel. > > He has worked out the circuit using several high power MOSFETs in parallel, > > but does not know how to connect them. > > Normally this is done with a couple of continuous-duty solenoids, > available at most auto-or-truck parts stores. > > I don't mean to discourage the MOSFET approach, but it may prove to > be a fussy design, and prone to exciting failure especially if the gate > drive gets to oscillatin' > > Cheerful regards, > > Bob > > -- > http://www.piclist.com hint: The PICList is archived three different > ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. .