For a number of reasons marine applications add stuff including manual and remote battery disconnects. Some of this is for intermittent use and long term storage. Some is to turn off the power when something wrong happens like a fire.

Dennis,
From my Windows phone.
________________________________
From: Mark McCulley<mailto:markmcculley@gmail.com>
Sent: �8/�10/�2017 4:32 PM
To: Dennis Haynes<mailto:d23haynes57@hotmail.com>
Cc: vanagon@GERRY.VANAGON.COM<mailto:vanagon@gerry.vanagon.com>
Subject: Re: Fuse Size: Aux battery to fuse block

The wiring diagram for the 7601 shows 2 wiring options, one for "engines with combined alternator and starter wires". Would this would be the wiring scheme to use with the Vanagon? I'm a bit confused because that wiring scheme requires a second component, a battery switch.

7601 wiring diagram: http://assets.bluesea.com/files/resources/instructions/980014350.pdf

-Mark

On Thu, Aug 10, 2017 at 7:03 AM, Dennis Haynes <d23haynes57@hotmail.com<mailto:d23haynes57@hotmail.com>> wrote:
For most applications with a single house battery and small loads I have been using the 7601. I have also been installing it if front of the left taillight. This unit is priced right small and being detachable from the base makes it easy if service is needed. The 7610 is an upgrade. For installations where surge power is needed such as for a winch or large inverter the 7611 keeps the batteries combines longer (lower voltage) so that both batteries are available for those loads along with the engine alternator.

Dennis

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

From: OlRivrRat<mailto:OlRivrRat@COMCAST.NET<mailto:OlRivrRat@COMCAST.NET>>
Sent: Thursday, August 10, 2017 1:32 AM
To: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM><mailto:vanagon@gerry.vanagon.com<mailto:vanagon@gerry.vanagon.com>>
Subject: Re: Fuse Size: Aux battery to fuse block

        So for an Aux Batt SetUp, Is this the ACR to get or is there something

Better &or More Affordable ~

http://shop.pkys.com/Blue-Sea-7610-SI-Series-Solenoid-120-Amp-1224V-ACR_p_1626.html?gclid=Cj0KCQjw5arMBRDzARIsAAqmJezwERkye99UmwdVFjCkBz8z9vOc4tw0J18_vzZCorHOBfT-Z3lYxfEaAionEALw_wcB

On 9 Aug , 2017, at 5:49 PM, Neil N wrote:

> Missed your last post somehow. Again, thanks.
>
> I will give the logic of 2 ACR for 3 batteries some thought. Another
> project is to update from solenoid type isolators (they're rated for
> continuous duty) I'm using.
>
> At this rate I'll never get around to my engine swap project! LOL.
>
> Neil.
>
> On 8/9/17, Dennis Haynes <d23haynes57@hotmail.com<mailto:d23haynes57@hotmail.com>> wrote:
>
>> During charging or in use discharge there is no problem have two different
>> size batteries connected together, especially for voltage based charging
>> systems. The ACR relay can also be used to connect those 2 house batteries
>> together so the solar can charge both and then disconnect during use or
>> storage. Yes, you can use 2 ACR for a three battery system.
>>
>> Dennis
>>
>>
>> -----Original Message-----
>> From: Neil N [mailto:musomuso@gmail.com<mailto:musomuso@gmail.com>]
>> Sent: Tuesday, August 8, 2017 7:05 PM
>> To: Dennis Haynes <d23haynes57@hotmail.com<mailto:d23haynes57@hotmail.com>>
>> Cc: vanagon@GERRY.VANAGON.COM<mailto:vanagon@GERRY.VANAGON.COM>
>> Subject: Re: Fuse Size: Aux battery to fuse block
>>
>> Thanks again Dennis.
>>
>> Though the solar panel was intended solely for charging the 2nd larger group
>> 27 house battery and running a TruckFridge, I later installed a fused switch
>> between the group 27 positive post and the group 41 battery so the panel
>> could charge both batteries. In hindsight, even though the group 27 has a
>> fused/isolated dedicated feed from alternator, when the engine is running,
>> power from alternator to group
>> 41 could feed back into the ground 27 battery; the system could be
>> imbalanced. ??
>
>
> --
> Neil n
>
> Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca>
>
> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy>
>
> 1981 Westfalia "Jaco" Images, technical <http://tubaneil.googlepages.com/>
>
> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>