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Date:         Fri, 13 Jun 2008 00:22:25 -0700
Reply-To:     Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Scott Daniel - Shazam <scottdaniel@TURBOVANS.COM>
Subject:      Re: Why AGM batts don't last as long as they should
Comments: To: Stuart MacMillan <macgroup@COMCAST.NET>
In-Reply-To:  <19D87882FAD34534A327F78759ED625C@StusLaptopPC>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I simply must get more effecinet at shpping parts........... I'm working on about 8 vanagons and remolding my whole shop........and I am not at the moment really into selling and shipping parts much............ but I can supply sold state, adjustable voltage regulators for Bosch alternators on Vanagons.

Any time anybody is having some problem with a non-lead-acid traditional battery...........I tell them that they have special charging requirements, and they should just get a normal high quality traditional lead-acid battery in there.

and do tell me- what is the advantage of AGM batteries ? I get the very best and strongest cold cranking amps ( 900 ) that fits and clamps down properly in a vanagon ...........and I never ever ever have one problem of any kind. Sure, I can't fly inverted with one, but for a starting battery...........what is 'not perfect' about a high quality automotive starting type battery???? I get like 7 years out of the ones I buy. scott www.turbovans.com

Stuart MacMillan wrote: > Yes, it's a problem due to higher internal resistance of the AGM and Gel > design. Marine alternators are set to the proper 14.4 volts needed for AGM > charging, and are much more robust compared to car alternators. I'll have > to do more research on car alternators to see if there is any way to get the > 14.4 needed. But maybe just another specific charger is the simplest way to > deal with this. > > Stuart > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Philip Zimmerman > Sent: Thursday, June 12, 2008 9:15 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Why AGM batts don't last as long as they should > > Good to hear your report of this confirmation Stuart! > Anytime I hear of a Vanagon with a dead AGM or two, I'm curious to know > what is the charging voltage at the battery terminals? If anything less > than the "magic" number of 14.2 or so, an AGM is going to perform > poorly or less than optimal. > > I further concur with your suggestion for utilizing a Charger > specifically designed for AGM's on a routine basis. Any battery (let > alone an AGM) will perform better following a good full three-stage > charge from a 110VAC Charger. Gotta keep those electrons stirred-up.... > > Phil Z. > Campbell River, BC > ----------------------- > > > Date: Thu, 12 Jun 2008 11:37:31 -0700 > From: Stuart MacMillan <macgroup@COMCAST.NET> > > After talking to a few marine electrical experts, it seems the problem > with > AGM's in cars is the alternator voltage is too low. You need 14.2 > volts to > fully charge a discharged AGM, and most alternators put out about 13 to > 13.7 > volts, depending on load, which is fine for flooded standard and deep > cycle > batteries, but never fully charges an AGM. So, either find someone who > can > tweak the alternator output, or buy a charger specifically designed for > AGM > & Gel and use it at least once a week. > > >


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