More charger questions

[Bruce Morris]

Actually when I took mine apart I found there is a thermal switch on the
old chargers that will shut it down if the charger goes above a certain
temperature. Other than that there is nothing but a bridge rectifier
and a couple big capacitors if my memory is right.

.

Bruce Morris in Raleigh, NC
Phone: (919)872-7635 Cell: (919)740-8941 (Verizon)
Wanderlodge Owners Online <http://www.wanderlodge.us> Webmaster

FMCA# 7142s VB KI4ME
Vietnam Vet - 1966-67 3rd MarDiv Navy Corpsman "DOC"



Chuck Wheeler wrote:
>
> Your close Pete! Batteries in good condition have a pretty constant
> resistance. But as they charge the terminal voltage rises and as the
> terminal voltage approaches the regulated charger voltage the current
> deceases due the lower voltage across the batteries resistance. Battery
> condition indicators usually just measure this terminal voltage. For
> example a Trojan T105 has a terminal voltage of 6.37 at full charge
> and 6.05
> at 50% charge. A properly regulated charger (or alternator) will initially
> charge at 7.4vdc. (Actually 14.8vdc for our 12 volt systems.) The
> alternator will modify this charging voltage based on battery temperature.
> That is why we have remote regulators in the wanderlodge FCs., located in
> the battery compartment, because the batteries are not in the engine
> compartment and are not at the same temperature as the alternator.
> Regulators back off the charging voltage as the temperature rises.
>
> Well designed chargers electronic chargers base their charging current
> based
> on terminal voltage. The original "battery boilers" have no such sensing.
> They just charge on no matter what the battery condition.
>
> - Chuck Wheeler -
>
> 82 FC 31 SB
>
> Fort Worth, TX
>
> _____
>
> From: WanderlodgeForum@yahoogroups.com
>
> [mailto:WanderlodgeForum@yahoogroups.com
> ] On Behalf Of Pete Masterson
> Sent: Monday, May 14, 2007 8:21 PM
> To: WanderlodgeForum@yahoogroups.com
>
> Subject: Re: [WanderlodgeForum] More charger questions
>
> Having had battery chargers (automotive) dating back to the 60's that
> exhibited this effect, I believe that the resistance of the battery
> increases as the charge level increases. However, that is not the
> same as the controlled voltage of the modern 3-stage chargers.
>
> Pete Masterson
> '95 Blue Bird Wanderlodge WBDA 42
> aeonix1@mac. com
> On the road at Lockhart Texas
>
> On May 14, 2007, at 6:37 PM, Scott Forman wrote:
>
> > Hate to split up the thread, but the other one was getting long.
> >
> > My 86 PT38 has what I assume are the original battery chargers. I
> > have
> > noticed, though, that on the 'D.C. Charge' gauge above the co-pilots
> > chair, the juice being applied to the batts trails off over time,
> > presumably as the batts get closer to full charge. Why is this if the
> > chargers put out a constant flow of juice?
> >
> > Scott Forman
> > 82 FC35RB sold today, but still in my possession
> > 86 PT38
> >
>
> [Non-text portions of this message have been removed]
>
>


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