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Old 07-25-2014, 10:27 AM   #11
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That's a great point Herk7769. I may reconsider and rewire my batteries to avoid the downstream charging as you pointed out. Thanks for pointing that out.

Ken
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Old 07-28-2014, 12:30 AM   #12
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Originally Posted by Campster View Post
Make sure the switch is wired up in the right place. My switch is wired between the chassis ground and the battery that has the cable going to the chassis ground. With the switch in the open position there is no ground connected to both batteries thus no path for the current to flow (disconnected). With the switch in the closed position the chassis ground is connected to both batteries thus there is a path for the current to flow (connected). This setup works great for me, once hooked up never a problem. My batteries are wired like the top diagram in the above link with a switch between the negative terminal on the battery on the left and the chassis ground.

The current draw has NOTHING TO DO with the number of battery's, but rather what you are running. You only need ONE switch and it should go on the positive side of the battery bank in my view. Use Herc's drawing.

series for 6 volt bats parallel for 12 volts.

Be careful.


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Old 07-28-2014, 06:41 AM   #13
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In the big scheme of things, it matters not which side is switched (provided ONE side is!).

Switching the ground is completely acceptable.

In a DC circuit you can break either leg and there is no current path through the battery stack PROVIDED there is only one ground or hot to the camper (including an inverter if one is installed).
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Old 07-28-2014, 08:32 AM   #14
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Originally Posted by garbonz View Post
The current draw has NOTHING TO DO with the number of battery's, but rather what you are running. You only need ONE switch and it should go on the positive side of the battery bank in my view. Use Herc's drawing.

series for 6 volt bats parallel for 12 volts.

Be careful.


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My two batteries are wired in parallel...I never said current draw has anything to do with the number of batteries? When I was talking about current flow I was assuming something in the trailer was on and with the switch either opened or closed current would flow or wouldn't flow from the batteries. I have been wiring the negative side going to chassis ground through the switch for many, many years....Herk is correct, it really doesn't matter which side you switch, I chose to switch the ground and it works fine. There is either a path or there isn't.....
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Old 07-28-2014, 09:45 AM   #15
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PROVIDED there is only one ground or hot to the camper (including an inverter if one is installed).
I also do think it doesn't matter, except for the provided thing here. JUST make sure there is one and ONLY one lead from the battery to the shutoff switch. some find it useful to have a terminal post to attach all the grounds to after the switch, or the pos leads. Personal preference.
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Old 07-28-2014, 09:49 AM   #16
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Originally Posted by Bmbrady77 View Post
You would only wire the batteries in series if you have 24VDC system. Series will double the voltage...Parallel will double the available current while keeping the voltage at 12VDC.

As far as the disconnect switches....It would depend on the location of the switch in circuit, but I would be willing to bet that the disconnect switch is not rated for the potential current draw you could get from 2 batteries in parallel. I would install a second switch or get a DPST switch rated for the current on each battery individually.

As a side note..If they hooked up the batteries in series and you have a 12VDC system...you may be in trouble and might want to check out the DC side of your system. At best you could have blown a fuse...At worse you could have fried all of your 12Volt appliances...
This was the post I was referring to, not CAMPSTERS. Sorry for any confusion.

There is some interesting and confusing post on this thread and while 12 volts is not REAL dangerous, the way this was going could (or maybe already has) created problems that didn't exist before.

It seem that I am adding to the confusion myself LOL.
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Old 07-28-2014, 11:13 AM   #17
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This was the post I was referring to, not CAMPSTERS. Sorry for any confusion.

There is some interesting and confusing post on this thread and while 12 volts is not REAL dangerous, the way this was going could (or maybe already has) created problems that didn't exist before.

It seem that I am adding to the confusion myself LOL.

I re-read that and I did type that up in a rather confusing manner...That's what I get for trying to make a quick reply from a smartphone while doing other things!! LOL

What I was trying to get at, or the point of the post rather, was to point out that paralleling two batteries of the same class will keep the voltage the same but double the AVAILABLE current (in theory anyway). This is oppossed to wiring the two batteries in series and doubling the voltage.

There are two reasons for ever wanting to do this..

1. Increased load on the battery bank so that adding a second battery would make the available current enough to cover the new load...or

2. To increase the available run time on a single bank charge while keeping the same load. (ie..Increase the overall AH rating).

My comment about the switch current rating would only be applicable to reason No. 1 stated above..

Sorry for the confusion!!
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