Orion 24/12 amp question

DIY
1

Hi,
I have done lots of research and am going to install a 24V battery bank and inverter into my Grand Design travel trailer. I have created a wiring diagram for everything and am at the point of sizing the wires and fuses.

My first install will use the existing inverter prep wire and 12V DC connections. Later I may run new wires to connect the inverter to shore power then to the breaker box and may also update the 12V system wire size so it can draw more amps.

WRT the Orion 24/12 DC-DC converter I plan on connecting its output to my trailer’s 12V system through its existing 30A self-resetting fuse.

I have not yet done a load test on the 12V system but plan to.

I would like to install the Orion 24/12 70A just in case I need more power in the future when I run larger wires.

I assume my trailer’s load will only pull up to the existing 30A capacity, so it will pull no more than 30A from the 70A Orion.

Is this assumption correct? Or should I use a smaller 30A or 40A model and upgrade later if necessary?
thanks,
Bill

2

Why don’t you directly step up to 48v, you have a much wider range of equipment available and can use thinner wiring.

3

I was going to do that but have limited Solar when I park my Trailer in covered storage so I chose 24V as a middle ground.

4

Shouldn’t be a problem to get a 120/48 charger…

5

Hi Bud.
I’d start with a 30A unit, and just parallel in another later if you need.
Nowadays 12V led lights etc, don’t draw much. And 12V appliances are far more expensive than AC ones. With inverters now everywhere, choosing DC kit has doubtful value.

6

Starting with 30A is cheaper anyway. Thanks for the input.