http://www.trojanbattery.com/pdf/DeepCycleMaintenance.pdf

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Mike
Sent: Friday, May 16, 2008 2:14 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: 4 Batteries

Batteries in series (Batt 1 + to vehicle + / Batt 1 - to Batt 2 + / Batt 2
-
to vehicle -) will add the voltages together, not the AH capacity.
Batts wired in parallel (vehicle - to Batt 1 - to Batt 2 - / vehicle + to
Batt 1 + to Batt 2 +) will keep voltages the same but add AH capacities.

It is possible to wire four 6V batts in series/ parallel to get both 12V
AND
increased total AH capacity.

Mike B.

----- Original Message -----
From: "Dennis Haynes" <d23haynes57@HOTMAIL.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Friday, May 16, 2008 1:11 PM
Subject: Re: 4 Batteries

> Batteries can be wired together to increase the amp/hour capacity. If un
> controlled, they should be matched for type and age. Otherwise the
battery
> with the higher voltage potential will discharge to the lower state of a
> weaker battery. If you really need more A/H capactiy that you may want
to
> consider the golf cart batteries in series route. This will give both
> capacity and durability.
>
>
>>From: Monsieur <obeechi@RUNBOX.COM>
>>Reply-To: Monsieur <obeechi@RUNBOX.COM>
>>To: vanagon@GERRY.VANAGON.COM
>>Subject: 4 Batteries
>>Date: Thu, 15 May 2008 22:46:46 -0700
>>
>>How would one set up 4 batteries in the Vanagon? I have a battery
switch,
>>with a type of relay between them, so one is the engine battery and one
is
>>the house battery. There is also an inverter that is wired only to the
>>house battery. The battery switch allows for starting the engine from
>>either battery.
>>
>>The idea of adding two more batteries to this confuses me. Would I need
>>three battery switches, one two switch between the two other
switches?...
>>but I also want batteries three and four to run the inverter as well...