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Old 05-31-2016, 09:07 PM   #1
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Battery Cable Question

2016 Flying Cloud 27FB

There are two sets of main leads. One set has standard battery clamps. The other has ring terminals.

What does each set power?

Thanks in advance.
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Old 06-01-2016, 06:18 AM   #2
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Originally Posted by Ernster View Post
2016 Flying Cloud 27FB

There are two sets of main leads. One set has standard battery clamps. The other has ring terminals.

What does each set power?

Thanks in advance.
I don't think we understand your question. Can you clarify, post a picture?
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Old 06-01-2016, 06:26 AM   #3
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Just a wild guess but if your trailer has a solar panel then the ring terminals may connect the solar charger.

Dennis
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Old 06-01-2016, 06:35 AM   #4
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Nope. No solar panels.
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Old 06-01-2016, 06:57 AM   #5
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Found my answer....

Quote:
Originally Posted by Ernster View Post
2016 Flying Cloud 27FB

There are two sets of main leads. One set has standard battery clamps. The other has ring terminals.

What does each set power?

Thanks in advance.
4 ga leads go to the inverter. 6 ga leads go to the 12 volt distribution bus.
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Old 06-01-2016, 10:49 PM   #6
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how to install battery disconnect?

Ernster, I was looking at the battery box on my new 2016 25 FC today and noticed the two pair of leads. Thanks for clarifying this. I was thinking about installing some sort of battery disconnect for storage.

Looking for advise on how to do this with the standard Interstate lead acid batteries. Any suggestions would be appreciated by this newbie.

Dave
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Old 06-02-2016, 03:52 PM   #7
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Airstream has a bad habit of using all 4 battery terminals when they add an inverter.

You would be ahead of the curve to connect all positive leads to the positive terminal of battery 1 and all negative leads to the negative terminal of battery 2.

I would also replace those mealy parallel cables and upgrade than from the ridiculous 6AWG that Airstream uses to a minimum of 2AWG.

If you wish to use a battery disconnect switch, it can be placed on the positive terminal with a 2AWG positive cable. Then run both of the trailer's positive feed cables to the downside of the disconnect switch.

This will shut ALL of the 12 VDC loads with a single turn of the switch.


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Old 06-02-2016, 06:17 PM   #8
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Quote:
Originally Posted by davidrrand View Post
Ernster, I was looking at the battery box on my new 2016 25 FC today and noticed the two pair of leads. Thanks for clarifying this. I was thinking about installing some sort of battery disconnect for storage.

Looking for advise on how to do this with the standard Interstate lead acid batteries. Any suggestions would be appreciated by this newbie.

Dave
Yeah.....What Lew said. LOL
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Old 06-02-2016, 09:59 PM   #9
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[QUOTE=lewster;1800891]Airstream has a bad habit of using all 4 battery terminals when they add an inverter.

You would be ahead of the curve to connect all positive leads to the positive terminal of battery 1 and all negative leads to the negative terminal of battery 2.

I would also replace those mealy parallel cables and upgrade than from the ridiculous 6AWG that Airstream uses to a minimum of 2AWG.

If you wish to use a battery disconnect switch, it can be placed on the positive terminal with a 2AWG positive cable. Then run both of the trailer's positive feed cables to the downside of the disconnect switch.

This will shut ALL of the 12 VDC loads with a single turn of the switch.

I have a 2016 internalional 27fb with an inverter and have the same wiring as the OP. What would be gained by connecting all the positive leads to one battery and all negative leads to the second battery?
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Old 06-02-2016, 10:18 PM   #10
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[QUOTE=Papa smurf;1801033]
Quote:
Originally Posted by lewster View Post
Airstream has a bad habit of using all 4 battery terminals when they add an inverter.

You would be ahead of the curve to connect all positive leads to the positive terminal of battery 1 and all negative leads to the negative terminal of battery 2.

I would also replace those mealy parallel cables and upgrade than from the ridiculous 6AWG that Airstream uses to a minimum of 2AWG.

If you wish to use a battery disconnect switch, it can be placed on the positive terminal with a 2AWG positive cable. Then run both of the trailer's positive feed cables to the downside of the disconnect switch.

This will shut ALL of the 12 VDC loads with a single turn of the switch.

I have a 2016 internalional 27fb with an inverter and have the same wiring as the OP. What would be gained by connecting all the positive leads to one battery and all negative leads to the second battery?
Standard practice is to only one one 'set' of output terminals on any paralleled bank of batteries. This includes any multiple numbers of the same batteries, like Airstream provides as standard equipment.

The parallel connections essentially create one big battery of 12VDC (nominal) and as many amp/hours of capacity as you have batteries, as the voltage remains a constant and the amperage adds in a parallel connection.

You can be sure that the internal cell-to-cell connectors in any battery of the size in question uses far heavier bus bars than the extremely small 6AWG parallel cables that Airstream uses. Interconnecting cables should be able to easily handle the highest potential amperage while the battery is discharging.

To your question; a single connection on each battery as described above will assure you of using all of the battery cells equally during discharge. This will give your battery cells an equal 'workout' during any discharge event and also allows for a single cable connection to a disconnect switch for complete battery isolation.

And BTW, I'm no fan of the automotive type battery clamps that Airstream uses in every trailer they build. Proper deep cycle systems always use solid copper eyelets that can be attached to the battery with either a nut or bolt, tightened to the battery manufacturer's recommended torque. Battery clamps just don't cut it.....especially when they loosen and create enough heat to melt the terminals!!!
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Old 06-02-2016, 10:52 PM   #11
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Quote:
Originally Posted by lewster View Post
Airstream has a bad habit of using all 4 battery terminals when they add an inverter.

You would be ahead of the curve to connect all positive leads to the positive terminal of battery 1 and all negative leads to the negative terminal of battery 2.

I would also replace those mealy parallel cables and upgrade than from the ridiculous 6AWG that Airstream uses to a minimum of 2AWG.

If you wish to use a battery disconnect switch, it can be placed on the positive terminal with a 2AWG positive cable. Then run both of the trailer's positive feed cables to the downside of the disconnect switch.

This will shut ALL of the 12 VDC loads with a single turn of the switch.


Lew Farber
RVIA/RVDA Nationally Certified Master Tech
ABYC Certified Master Marine Electrician
Master Tech Energy Systems, Inc.
AM Solar Certified Installation Center*AMS Lithium Batteries
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*********************************


Thanks for the advice! Not sure I am confident of making the recommended changes myself, but what you are suggesting make sense.
Some of the videos I have seen on a battery disconnect say they should be used on the negative terminal so I am confused but my understanding of electrical systems is obviously very limited. Lew, until, I can get some local professional help, here in NW Georgia, what should I disconnect on the current set up that will keep my batteries from draining while in storage?

Thanks again for your expertise and the other comments. Maybe eventually I will get a clue!

Dave
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Old 06-03-2016, 12:16 AM   #12
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Quote:
Originally Posted by davidrrand View Post
*********************************


Thanks for the advice! Not sure I am confident of making the recommended changes myself, but what you are suggesting make sense.
Some of the videos I have seen on a battery disconnect say they should be used on the negative terminal so I am confused but my understanding of electrical systems is obviously very limited. Lew, until, I can get some local professional help, here in NW Georgia, what should I disconnect on the current set up that will keep my batteries from draining while in storage?

Thanks again for your expertise and the other comments. Maybe eventually I will get a clue!

Dave
Dave,

When you remove a battery terminal to isolate a battery bank that is in place, you always remove the negative terminal first. This serves a dual purpose and is safety related: if you happen to contact the battery box housing with the wrench, there is no difference in electrical potential as the frame is also the ground and there will be no spark or damage. Doing the same on the positive terminal could create a welded wrench-to frame situation. Second, if the negative battery terminal happens to contact the frame or box wall, again, nothing happens.

This situation is moot if you install a battery disconnect switch, as all of the marine grade disconnect switches that I use (Blue Sea Systems M-Series) have fully enclosed and water-proof contacts that will not produce any type of arcing.

Major disconnect switches and fusing systems are always placed in the positive cable runs according to the ABYC (American Boat and Yacht Council). The M-Series switches are also ABYC approved.
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Old 06-03-2016, 05:57 AM   #13
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Quote:
Originally Posted by lewster View Post
If you wish to use a battery disconnect switch, it can be placed on the positive terminal with a 2AWG positive cable. Then run both of the trailer's positive feed cables to the downside of the disconnect switch.

This will shut ALL of the 12 VDC loads with a single turn of the switch
What would be the best place to install the battery disconnect switch, is there enough space to locate it inside the battery box or if it needs to be outside do you drill a hole in the battery box to run the cables. Would mounting it on top of the battery box make sense providing you have cables long enough to open the battery box.
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Old 06-03-2016, 12:24 PM   #14
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I usually put them on the outside of the battery box. They are waterproof and rated for outdoor use. There should be sufficient space in the existing cable entry holes to run 2AWG and the ground cables.


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RVIA/RVDA Nationally Certified Master Tech
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