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Old 10-05-2016, 06:30 AM   #41
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Originally Posted by Jorgen View Post
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.
If you only plan on camping at full service sites, there is/was no need to upgrade to the T-105 batteries. A regular Marine/RV battery would have handled the task with little or no effort.

The wire between your TT's charge controller and the battery is fine as it is. There is no reason to change it. The only place where you need to increase the size is if you are planning on installing an inverter. A 600 watt inverter does not need the 1/0 AWG wire. The only time you would want to install the 1/0 is if you are planning on a large output inverter.


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Old 10-05-2016, 03:09 PM   #42
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Use the heavy wire between the two batteries and to get to where the original battery connections were if you are relocating them. You can use lighter gauge to the inverter and then just tie into the original trailer wiring. The manual for my Xantrex gave the required wire gauge to support it.

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