X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [208.97.132.145] (HELO randymail-a5.g.dreamhost.com) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4017567 for flyrotary@lancaironline.net; Sat, 12 Dec 2009 16:09:11 -0500 Received-SPF: none receiver=logan.com; client-ip=208.97.132.145; envelope-from=ryan@deadfrog.net Received: from [192.168.1.191] (c-24-15-31-37.hsd1.il.comcast.net [24.15.31.37]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by randymail-a5.g.dreamhost.com (Postfix) with ESMTP id 8E8EF8EFC3 for ; Sat, 12 Dec 2009 13:08:34 -0800 (PST) From: Ryan Wilkins Mime-Version: 1.0 (Apple Message framework v1077) Content-Type: multipart/alternative; boundary=Apple-Mail-3-1024530679 Subject: Re: [FlyRotary] battery desulfator Date: Sat, 12 Dec 2009 15:08:08 -0600 In-Reply-To: To: "Rotary motors in aircraft" References: Message-Id: <5D500342-72B4-4CDB-8465-A09A8ADDDDE0@deadfrog.net> X-Mailer: Apple Mail (2.1077) --Apple-Mail-3-1024530679 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Haven't seen the article you mention but there seems to be some merit to = the idea. These devices are more popular in the alternative power = industry (Solar, Wind, Hydro) where large banks of batteries are used to = store generated power. After investing thousands of dollars in battery = banks, the last thing one wants is to replace the batteries every 4-5 = years because the plates are sulfated. Apparently, pulsing a battery = with a pulse width modulated (PWM) charge in the range of 300 Hz or so = causes the sulfates to break down and become reabsorbed into the battery = acid. I've been interested in trying a battery desulfator but haven't = had the opportunity yet, though what I've read is that while desulfators = work, they take a couple weeks or a month to actually do their magic on = a badly sulfated battery. If you can put a desulfator on the battery = while it's still in a reasonably useful state and keep it connected for = the long-term, I'd bet this would work as advertised. Cheers, Ryan Wilkins On Dec 12, 2009, at 2:11 PM, John wrote: > In the Dec 06 Sport Aviation Magazine, there is an article by a Dave = Baker, about a circuit board to pulse desulfate lead acid battery's. My = aircraft battery is dying, along with other batteries on the farm. Does = anyone have any knowledge if this do it yourself item works. JohnD=20 --Apple-Mail-3-1024530679 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Haven't seen the article you mention but there = seems to be some merit to the idea. These devices are more popular = in the alternative power industry (Solar, Wind, Hydro) where large banks = of batteries are used to store generated power. After investing = thousands of dollars in battery banks, the last thing one wants is to = replace the batteries every 4-5 years because the plates are sulfated. = Apparently, pulsing a battery with a pulse width modulated (PWM) = charge in the range of 300 Hz or so causes the sulfates to break down = and become reabsorbed into the battery acid. I've been interested = in trying a battery desulfator but haven't had the opportunity yet, = though what I've read is that while desulfators work, they take a couple = weeks or a month to actually do their magic on a badly sulfated battery. = If you can put a desulfator on the battery while it's still in a = reasonably useful state and keep it connected for the long-term, I'd bet = this would work as advertised.

Cheers,

Ryan = Wilkins

On Dec 12, = 2009, at 2:11 PM, John wrote:

In the Dec 06 = Sport Aviation Magazine, there is an article by a Dave Baker, about a = circuit board to pulse desulfate lead acid battery's. My aircraft = battery is dying, along with other batteries on the farm. Does = anyone have any knowledge if this do it yourself item works. = JohnD

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