T&T: 24v charger

[2elnav at netbistro.com]

Post script.
Dave is  correct in  pointing out  the potential issue of some types of 
charger.
the original disuciison  dalt with  multi bank chargers which have to have 
isolation  in order to work with mor than one  battery.

Others have pointed out the fallacy of using automotive chargers  which do 
not have
internal isolation diodes.

It just goes to show, never take anything for granted; nor assume  that 
everybody is on the same page.  :-((

We have often bitched about the exorbitant price of  'marine'  products  but 
here is a case where marine grade does in fact  reflect better quality  for 
more money.

Quality  chargers intended for permanent  connection to battery banks that 
may see multiple  charging sources such as engine alternator, solar panels 
or  a combiner  will have internal  diodes to prevent a back feed.  Multi 
bank chargers intended to charge two or more batteries will also have diodes 
on each output.
But dedicated chargers intended to work as stand alone  and connected to a 
single battery  may not.
TC40+  IOTA and  Newmar  have the required characteristics.

Arild

----- Original Message ----- 
From: "Dave Legrow" <dlegrow at yahoo.com>
To: <trawlers-and-trawlering at lists.samurai.com>
Sent: Sunday, May 03, 2009 11:17 AM
Subject: T&T: 24v charger


> >A better way to combine them for charging is to
>>split the bank in parallel like this...:
>
>
> Ahh, a question of misleading verbage, for they are not actually parallel, 
> but
> rather still in series, with a floating 12v reference (unless you are 
> putting
> in a relay or swtich between the two batteries).
>
> Hopefully, Arild recommended to you a model that has isolated outputs. 
> Some
> chargers will go beserk or worse hooked up this way - but as usual - Arild 
> is
> correct, if you use the right model charger.
>
> Dave
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