How many batteries does the Rockwood 2104S come with?

[SlowrideHD]

If you have room for the installation, two GC2 class 6 volt batteries (such as Trojan T-105 or equivalent) will give you a lot more amps available to use than two group 27 deep cycle 12 volt batteries.

[chriscowles]

FYI, this comment from Anthony Yoder, the Rockwood sales rep, in response to a query from me about the size of the tray:

From: Anthony M. Yoder
Sent: Wednesday, September 11, 2019 12:14
Subject: Re: Mini-Lite battery rack?

"... The battery tray is intended to carry two 6 v batteries and we have not heard of any issues with two fitting, regardless of brand, type, etc."

[67L48]

Originally Posted by SlowrideHD

If you have room for the installation, two GC2 class 6 volt batteries (such as Trojan T-105 or equivalent) will give you a lot more amps available to use than two group 27 deep cycle 12 volt batteries.

That's been debunked here plenty of times. You can find 100-105 AH Group 27 12 VDC batteries. The Trojan T-105 is 220 AH. So, yeah, the 2x6 V will give you 5-10% more AH than the 2x12 V. Is that "a lot more amps"? That's sort of subjective.

• 6V at 220 AH * 2 = 12V at 220 AH
• 12V at 100 AH * 2 = 12V at 200 AH

This flips around if you go with a Group 29, which isn't that much larger of a footprint. I think I ran a 115-120 AH Group 29 with my old trailer. That (doubled) would have given me a bit more than 2x6. But, I'd still question if it were truly significant.

There are lots of reasons why 2x6 might be a better option. Footprint, maybe price, maybe maintenance/durability, etc. Capacity, though, generally isn't one of the reasons ... unless you are comparing the best 6 VDC battery (Trojan) to the crappiest 12 VDC battery (Walmart, e.g.).

Here is one example of a Group 27 battery rated to 115 AH. Doubled gives you 230 AH, which is more than 2x6V T-105. It is as good of a battery? I very much doubt it. The Trojan will probably outlast it several times over and there may be other advantages to the 2x6. But, capacity isn't necessarily one of them.

[MedicJim]

Just got a 2020 2109s and it had 2 deep cycle batteries in the box .

[frank4711]

Watching .... good info ... thanks

[Flybob]

Originally Posted by MedicJim

Just got a 2020 2109s and it had 2 deep cycle batteries in the box .

Are these true deep cycle batteries or marine dual purpose.

[MedicJim]

[QUOTE=Flybob;2217786]Are these true deep cycle batteries or marine dual purpose.[/QUOTE

Marine didn't expect 2 as it was

[bikendan]

Originally Posted by MedicJim

Just got a 2020 2109s and it had 2 deep cycle batteries in the box .

That was the dealer's decision. Some dealers do install two batteries on TTs. Most only install one. Almost all are cheaper dual-purpose marine batteries, NOT true deep cycle batteries.
I'm betting that's you have. If it has a CCA rating, it's not a true deep cycle.

[SlowrideHD]

Originally Posted by 67L48

That's been debunked here plenty of times. You can find 100-105 AH Group 27 12 VDC batteries. The Trojan T-105 is 220 AH. So, yeah, the 2x6 V will give you 5-10% more AH than the 2x12 V. Is that "a lot more amps"? That's sort of subjective.

• 6V at 220 AH * 2 = 12V at 220 AH
• 12V at 100 AH * 2 = 12V at 200 AH

.

Debunked?
I have years of real life experience with a remote solar operation in an off grid cabin. I have used well over two dozen group 27 deep cycle batteries of different brands and in different configurations over the years.
Currently running sixteen Trojan T-105 batteries in a 8S-2P configuration fed by 12 solar panels in a 3S-4P config for 3.3kw of power to my MPPT charge controller.
You can add and multiply numbers all you like and jot them down on paper....I know what works well. BTW....T-105 are 225 Amp.

[67L48]

Originally Posted by SlowrideHD

Debunked?
I have years of real life experience with a remote solar operation in an off grid cabin. I have used well over two dozen group 27 deep cycle batteries of different brands and in different configurations over the years.
Currently running sixteen Trojan T-105 batteries in a 8S-2P configuration fed by 12 solar panels in a 3S-4P config for 3.3kw of power to my MPPT charge controller.
You can add and multiply numbers all you like and jot them down on paper....I know what works well. BTW....T-105 are 225 Amp.

Correct. Debunked. Remember that I'm not talking about anything but capacity. You seem to have conflated a bunch of other battery system attributes into your response.

The concept of 2 * 6V having much greater capacity than 2 * 12V has been debunked many, many times. It's simple math and my post was 1-dimensional about that one attribute of the system.

All of the rest of your post speaks to durability, quality, and other attributes. There may be many reasons why a 6V bank is better for a person's needs. However, capacity in AH isn't one of them. The AH capacities of 2-battery systems are about the same ... unless you get small, crappy 12 VDC batteries. Good Group 29+ 12V batteries will have 100-120 AH and compare favorably to 6V batteries for capacity.