Here's where I run into a problem. 1380w/12v=115a. This is far bigger than any SCC I can afford (or have found for that matter).
Output amps is a soft limit, generally speaking, you can exceed it with the only downsides being that when your solar panels are operating at 100% of STC rating (which is rare, especially on an RV) you will not be getting 100%, and you will be running at closer to 100% of the charge controllers rating much of the time so ventilation/cooling may be more of a concern. 100A controllers are available.
However there are two other options. (1) up the battery bank voltage (2) use two or more controllers (this option has other advantages in a mobile context as well).
The most important limit you need to make sure you don't exceed is the controllers input voltage limit. The Voc of your panels
after accounting for low temperature cannot exceed the controllers max input voltage. There is also a max input current for controllers, but from what I've heard this is much less critical (still should be followed).
So is my only option at this point to increase the voltage of my system to 24v and buy a 60a charge controller?
See discussion of options above.
(1380wh/24v=57.5a would 60a be cutting it too close?) If this is the case, it kind of throws a monkey wrench in my plans.
Thats actually pretty ideal (so long as the input limits of the controller are not exceeded).
I was looking to build my own battery out of loose cells. However, all of the cells that Will recommended are 3.2v and usually come in packs of 4. This means that I would need to either find some 6v cells elsewhere or buy twice as much battery as I need. I feel like there's something I'm missing here. If anyone has any helpful advice on how to achieve my goal here I'd love to hear it. Thanks for your time!!
All LFP cells are 3.2V, no such thing as 6V cells in the LFP world.
"12V" = 4 x 3.2V,
"24V" = 8 x 3.2V,
"48V" = 16 x 3.2V
As you can see from the math, the '12, 24, 48' values are nominal values, not actual values.
As to needing to buy "twice as much battery as you need" to go with 24V, I think you are misunderstanding something here, but I cant tell exactly what. If you want/need 2400Wh, 8 100Ah cells could accomplish that (8 x 3.2V x 100Ah = 2560Wh), and could be configured as either a 12V or 24V battery.
The relevant thing to pay attention to is Watt-Hours (or Kilowatt-Hours), especially when comparing between different voltages. New builders often focus in on Amp-Hours which is a useful unit in some contexts, and the most common unit in marketing materials and specs but also leads to a lot of new-builder confusion.