Date: Tue, 24 Aug 2004 18:26:15 -0400
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: [Syncro] Re: dual battery isolator
In-Reply-To: <JBEOJOBKGBDBEAIBOCBEEEECDJAA.syncrowestytd@mindspring.com>
Content-type: text/plain; charset=us-ascii
These devices do not in any way control current based on battery charge
level. It does not know or care. It is just a solid state check valve.
The current will flow to the batteries as long as the voltage from the
alternator exceeds the at rest voltage of the battery. The only
advantage of this device is that when the alternator output drops below
the accessory load, (engine idle, AC on high with radiator fan on high
with high beams on etc.) the house battery will not discharge into the
main battery or help support that load. Once the alternator produces
sufficient output to maintain an adequate charging voltage there is no
advantage at all.
Dennis
-----Original Message-----
From: Westyman [mailto:syncrowestytd@mindspring.com]
Sent: Tuesday, August 24, 2004 2:26 PM
To: VWVANFULLTIMERS@yahoogroups.com; Syncro list; Vanagon list
Subject: [Syncro] Re: dual battery isolator
Doesn't this type of isolator actually feed differing amounts of charge
to
each battery bank, based on the amount of discharge, and taper off that
charge as they reach full capacity? ?
-----Original Message-----
These devices are very good. Again, whether using this type of device or
relay, the charge effect will be the same as the alternator will
determine the charge capacity. If both banks of batteries get the 14
volts, then each will take the current it requires. A heavy duty, 150 RV
style relay (looks like a Ford solenoid) coats about $15-$20.
Dennis
-----Original Message-----
Dennis,
Thanks, good info to know. I really wasn't aware of the voltage drop
issue,
among others. How do you feel about Hellroaring's isolator-combiners?
they
claim less than .005 volt drop. http://hellroaring.com/bic75150.htm I
really
don't see a relay system keeping proper charge on tow batteries so
widely
different.
And yes, this is getting expensive just to keep food cool, but a cooler
is
out of the question for the month-long trips I take, in both the
constant
need for ice and space limitations.
Karl
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