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Old 06-12-2015, 02:58 PM   #31
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We just did the same thing. We purchased a battery box from Interstate that was designed for 2 6v batteries and couldn't be happier with it.
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Old 12-16-2015, 05:46 PM   #32
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Nice job, Bob.

We just purchased 2 Trojan T-145 batteries and I am wondering what gauge cable I should use for the short run between one battery's positive and the other battery's negative. Is a 2 AWG cable large enough or should I go larger? Do you know the gauge of the original Jayco cables?

I notice you did your mod back in 2011. Are you still using the original batteries?

Ken
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Old 12-16-2015, 07:13 PM   #33
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snip....... Is a 2 AWG cable large enough or should I go larger? Do you know the gauge of the original Jayco cables? I notice you did your mod back in 2011. Are you still using the original batteries?....snip
Ken,

As far as the short jumper cable between your two batteries, it should match or exceed the size of your existing TT battery cables. The 2 AWG should be fine for your jumper set-up....., I believe Jayco uses 4 AWG (what my 2005 Eagle came with).

Yes, I'm still using the same two Interstate Deep Cycle batteries purchased in 2011, and all cells check out great.

Bob
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Old 12-16-2015, 10:53 PM   #34
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Thanks, Bob

Ken
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Old 12-17-2015, 09:48 AM   #35
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The rule of thumb for connecting 2 batteries in series is that the the connecting cable (between the batteries) should be no thinner than the thickest part of the battery circuit, but using the next thicker cable size is highly recommended.

If you have a 4 AWG between your Batteries negative terminal and frame ground, and a 4 AWG from the positive terminal to the TT supply, the connecting cable between the batteries should be at least 4 AWG.

If you have an inverter and the cables are 1/0 AWG connecting it to the batteries, you need to have at least a 1/0 AWG cable between the batteries.

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Old 12-17-2015, 10:00 AM   #36
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Good to know, Don. Thanks.

I do plan to install an inverter at some point so I'm thinking I will go with a 1/0 AWG cable. Do you know where I can buy a ready-made 12" or 18" cable for Trojan T-145 posts?

Ken
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Old 12-17-2015, 11:55 AM   #37
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I do plan to install an inverter at some point so I'm thinking I will go with a 1/0 AWG cable. Do you know where I can buy a ready-made 12" or 18" cable for Trojan T-145 posts?
Ken,

I do not know of any QUALITY sites that sell those sizes of 1/0AWG cables. I would recommend that if you are going to be doing wiring upgrades and or adding electrical things (inverter, SOLAR...) in the future, you may want to look into getting a heavy duty cable crimping tool (see below - Harbor Freight). I purchased one of these about 2 years ago and I am constantly using it. It crimps up to 1/0 AWG cables... Price is GREAT!!
In the long run, it will be less expensive than trying to order specific sizes on line.

I get my cable/connectors/heat shrink from Sonic Electronix, they usually ship on the same day I ordered.

Harbor Freight - Hydraulic Cable Crimping tool
Hydraulic Wire Crimping Tool
Sonic Electronix - Cable
1/0 Gauge Power & Ground Wires at Sonic Electronix
Sonic Electronix - Connectors
Ring Terminals | Car Batteries & Power | Power & Ground Wire | Amplifier Installation & Accessories | Car Amplifiers | Car Audio, Video & GPS at Sonic Electronix

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Old 12-17-2015, 02:15 PM   #38
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Thanks, Don.

I'll take your advice and make my own cables. You've made it must easier for me (and others) by including the websites.

Ken
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Old 12-17-2015, 07:43 PM   #39
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I've just done a number of custom cables and used the Hobart 770122 crimper. It worked well all the way from 4/0 awg welding wire down to 6 awg.
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Old 10-04-2016, 09:22 PM   #40
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I've purchased my T-105 batteries and a variety of parts but I'm having a hard time understanding the need for such burly wiring. Especially so because the wiring my TT came with is only 8 AWG so I believe I'd need to go all the way back to my panel if I've done my research. What I don't understand is the need to go from 8 AWG to 1/0. I found a white paper here Trojan battery put out that shows the ampacity going from 55 with 8 AWG to 170 with 1/0. Do dual T-105's really increase the need that much? I've tried understanding this with Watt's law W=V*I or watts=volts*amps and can start to understand it if one wishes to connect a 2000W inverter but, if not, why does one still need such a thick gauge wire? I'm very new to all this but would like to understand.
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