Pictures of my dual GV2 battery setup.

Don't understand why Century insists on manufacturing these battery boxes in white plastic instead of conventional black as does NOCO. :h

Looks very good to me. You'll find that it's a good improvement over what you had before, no doubt.

The 2 gauge wire is probably heavier than you need, but there's certainly no harm in that. Replacing the leads to the RV with heavier ones would have greater benefit (but also greater cost and greater difficulty in installation).

Sorry to be "that guy", but where's the fuse?

Altee,

The job is real clean and in coming years you will realize the effort was well spent.

There are some minor things
Not only is Gordon right about "Where's the fuse?", but you have a black wire going to a positive post. At least get some read tape to mark it. That is the kind of thing that will get screwed up when you least can afford it.
In the pictures, it looks like the cables to the bank are different sizes. While this may never matter, If you have charging difficulties, this could be a factor.

I have been changing owners boats that had paralleled 12V over to 6V in series until the money ran out a few years back. To a man, they saw an improvement in the available house power.

Matt

SoundGuy wrote:
Don't understand why Century insists on manufacturing these battery boxes in white plastic instead of conventional black as does NOCO. :h

A cooler battery is a longer lasting battery.

Matt_Colie wrote:
you have a black wire going to a positive post. At least get some read tape to mark it. That is the kind of thing that will get screwed up when you least can afford it.

It's an RV. The convention is black=12V, white=ground. Red is the non-standard color (well, left turn/stop, anyway). But, yeah, + and - labels are good to have.

Matt_Colie wrote:
Not only is Gordon right about "Where's the fuse?"...

Why would the OP need a "fuse" when no doubt that positive battery cable running back to the trailer first goes directly to a resettable circuit breaker, most likely mounted on the trailer's A-frame. That's the "fuse". I'd agree though, regardless of the colour of wire used I'd mark each as POS and NEG for ease of identification. :)

SoundGuy wrote:
Don't understand why Century insists on manufacturing these battery boxes in white plastic instead of conventional black as does NOCO. :h

mike-s wrote:
A cooler battery is a longer lasting battery.

You seriously believe that's why these Century boxes are white and not black like every other battery box on the planet? :@ Seriously? :R

SoundGuy wrote:
Don't understand why Century insists on manufacturing these battery boxes in white plastic instead of conventional black as does NOCO. :h

Same here. They are going to look like c rap in a few years when the algae and black mildew discolors them, like the white propane tank covers they used to foist on us.

SoundGuy wrote:
Don't understand why Century insists on manufacturing these battery boxes in white plastic instead of conventional black as does NOCO. :h

drsteve wrote:
Same here. They are going to look like c rap in a few years when the algae and black mildew discolors them, like the white propane tank covers they used to foist on us.

It's just a matter of esthetics and I guess some like white but to me it looks dorky, no different than white propane tank covers. :( However, black plastic tank covers, tongue jack head covers, battery boxes, etc, can still fade over time from constant exposure to the sun. After repainting my tank cover I solved this issue by covering the entire tongue jack anytime the trailer is parked and we're not using it. This cover has faded badly but all the black plastic parts underneath haven't at all. :B

SoundGuy wrote:

Matt_Colie wrote:
Not only is Gordon right about "Where's the fuse?"...

Why would the OP need a "fuse" when no doubt that positive battery cable running back to the trailer first goes directly to a resettable circuit breaker, most likely mounted on the trailer's A-frame. That's the "fuse". I'd agree though, regardless of the colour of wire used I'd mark each as POS and NEG for ease of identification. :)

I'm glad your psychic powers confirmed the presence of a current interrupting device.