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Old 06-03-2016, 02:14 PM   #15
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Any suggestions on any type/style/brand of battery disconnect switch?
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Old 06-03-2016, 02:15 PM   #16
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Old 06-03-2016, 02:34 PM   #17
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Thanks much!
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Old 06-04-2016, 08:36 AM   #18
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Thanks Lew! Do you make house calls? LOL I imagine you are already back in Oregon. Until I can get a pro to rewire the batteries per your suggestion, can I just disconnect one of the negative cables or do I need to disconnect both?

Dave
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Old 06-04-2016, 10:10 AM   #19
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Originally Posted by davidrrand View Post
Thanks Lew! Do you make house calls? LOL I imagine you are already back in Oregon. Until I can get a pro to rewire the batteries per your suggestion, can I just disconnect one of the negative cables or do I need to disconnect both?

Dave

If you have the stock battery arrangement of 2 group 24s in parallel, simply remove the both small cables that connect the two batteries. That will effectively break the circuit without having to also remove the automotive type connectors.


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Old 06-05-2016, 11:58 AM   #20
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If you have the stock battery arrangement of 2 group 24s in parallel, simply remove the both small cables that connect the two batteries. That will effectively break the circuit without having to also remove the automotive type connectors.


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Thanks! Yes sir, the two stock 24s. So I disconnect the small black negative parallel cable, then the small red parallel cable and all is disconnected?

Dave
Sorry to be so dim.
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Old 06-05-2016, 03:12 PM   #21
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Should do it.


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Old 09-01-2016, 04:41 PM   #22
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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.
Any suggestions on any type/style/brand of solid copper eyelets to replace the automotive type battery clamps?


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Old 09-01-2016, 06:49 PM   #23
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[QUOTE=lewster;1801038]
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Originally Posted by Papa smurf View Post

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.
The Interstate SRM-24 batteries only have a single electrical connection, although they do have 2 ways to attach loads to that connection one threaded and one standard terminal post.

I don't think there is anyway you can wire up a 12V lead acid battery so that the load doesn't travel through all of the cells equally.

Am I missing something?
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Old 09-01-2016, 07:16 PM   #24
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[QUOTE=Mgieselman;1844612]
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Originally Posted by lewster View Post

The Interstate SRM-24 batteries only have a single electrical connection, although they do have 2 ways to attach loads to that connection one threaded and one standard terminal post.

I don't think there is anyway you can wire up a 12V lead acid battery so that the load doesn't travel through all of the cells equally.

Am I missing something?
Absolutely!

In any 2 battery system, the loads should be split across both batteries in the following fashion: Positive to battery #1 and negative to battery #2.

Regardless of the size of the parallel connection cables, you should not connect both load cables to a single battery.

This is not the case in a series connection between 2 batteries, as the only terminals remaining would be the positive on battery 1 and negative on battery 2.
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Old 09-02-2016, 12:27 PM   #25
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[QUOTE=lewster;1844620]
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Absolutely!

In any 2 battery system, the loads should be split across both batteries in the following fashion: Positive to battery #1 and negative to battery #2.
That applies to 2 batteries connected in series but not to parallel, if you connect them in parallel it doesn't matter were you connect the load or even if you do it in multiple places as Airstream does.

When a load is applied to batteries connected in parallel it draws equally from all the batteries in the bank. This can be proven out using a DC current clamp around the connection to each battery.



Here's how my batteries were connected from the factory.

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Old 09-02-2016, 01:31 PM   #26
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Not quite. Recommended practice is to wire like fig.1. The reason for this is that the wire connecting the batteries together has a small resistance that will create an imbalance between the batteries charge / drain in a parallel configuration. If you have more than two batteries in parallel as I do it is even more important to wire as in fig. 1 .

There's only one way to wire in series configuration...
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Old 09-02-2016, 02:01 PM   #27
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[QUOTE=Mgieselman;1844935]
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That applies to 2 batteries connected in series but not to parallel, if you connect them in parallel it doesn't matter were you connect the load or even if you do it in multiple places as Airstream does.



When a load is applied to batteries connected in parallel it draws equally from all the batteries in the bank. This can be proven out using a DC current clamp around the connection to each battery.







Here's how my batteries were connected from the factory.




Your batteries are wired EXACTLY as I recommended! The inverter cables are split between both batteries as are the house DC cables.

Neither are connected to a single battery but are spread across both.

In addition, those 6 AWG parallel cables should be significantly larger, as they should be fully compatible with the much larger internal connectivity bus found INSIDE the batteries that physically join the cells.

Connecting both load cables to a single battery in a parallel system will almost guarantee uneven battery draw and charging.


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Old 12-22-2016, 11:42 AM   #28
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Hi Lew,

In the upgrade to my electrical system to a ~400 Ah battery bank, would I be better off with two GPL-4DL (lifting weight aside), three GPL-30HT or four GPL-27T. The weight and cost (per Ah) is approximately the same and they would all fit under my front sofa. I am thinking lower internal resistance in the bigger batteries is good (versus external wiring on smaller Ah batteries). I am also thinking the redundancy of the smaller batteries is good. What would be your guidance?

Thanks, Dave
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