Solar charge controller selection help needed

Unfortunately the charge controller needs to sit between the battery and the load to do this and has to be sized to the load amperage.

I am assuming that worst case scenario would be 55 amps because that is my panels rated amperage.

No I am not. I do not have an inverter nor do I need one. I am talking about the converter in the WFCO 9855.

If I do not use the load output I lose all the consumption metrics and more importantly, the LVD.

You are not understanding the controller's attributes correctly. You need to look through some installations and read some copy to get a handle on what the controller does and what it does not.

First, the primary role of the solar charge controller is to charge your battery. A secondary function is to operate through the "load" terminals a device/s when the battery reaches a certain charge state, at a certain time or duration (like for lights or fans, if so equipped).
The solar panel's wires are connected to the (+) (-) terminals for module input. The (+) (-) terminals for output are connected to the battery terminals. An auxiliary "load" can be connected at the controllers Load terminals, (+) (-).

The included monitor does not have to be connected in between any thing. It is connected to the controller and probably, a shunt on the 12 V (-), immediately before frame ground. You will not lose any functionality by not using the "Load" outputs.

How all of this relates to the rating of your existing converter is still baffling. Where does 55 amps and a conflict raise itself? Your solar panel is not rated to deliver 55 amps. The controller will not produce 55 amps. If you have a solar system that does deliver 55 amps, it has nothing to do with the converter. In fact, both could be operated in parallel in most cases.

Dan Meyer's Golden rules of solar Some of it may be dated but read it to get a handle on the relationship of everything.

Forum member's solar installations Thanks to Renoman, we have this excellent pictured compendium of solar installations. Find one you like and copy it.

Good luck with the installation. Fire way with any questions, I think you may have a couple.:B

Edit: I finally got it. You were thinking of connecting the controller "load" output to the 12 V distribution panel. You assumed that the current from the solar controller in combination with the existing charger would overload the distribution panel. In my neck of the woods that is called "going to Duluth by way of Mankato"-not the right direction.

Connect the solar controller's output terminals directly to the battery with a fuse or circuit breaker in place to interrupt the circuit and protect the wire. Start thinking about how you want to bring fat cables to the battery. Maybe, at the same time, upgrade your connection wiring from converter to battery. If you use a bus, both can be accomplished.

I'd suggest to also consider a switch or manual circuit breaker between the solar module and th3e solar controller. It may be necessary to work on things in the future and disconnecting the module output with the flip of a finger is very convenient.

If you've looked at any solar installations you will see that most try to locate the solar controller as close to the battery as possible. That is a wonderful idea.