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
In-Reply-To: <19D87882FAD34534A327F78759ED625C@StusLaptopPC>
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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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