solar on/off grid installation

I forgot to add that i am buying an mppt charge controller for the camper. I thought that was in my first post. Really the important question i need answered is; Can i connect the load off the mppt charge controller directly to an ac breaker in my camper fuse box?

No, because the power is still DC. You need to invert it to AC, send the power through a transfer switch, and it can then be used through the RV's load center.

It will also be more practicable to store the solar power in batteries before inverting as there is a limit to the power produced and there is also the variability of solar output. IOW, what happens when the 500W modules are expected to supply power to a 1200W coffee maker and clouds intervene?

In my previous post I had tried to explain the characteristics of typical residential grid tie and the limits but deleted it after I looked at the length of my post. I'll post some of it again for clarity and continuity of the subject.

As Gavin noted, you can't connect 120V from a non-utility source (solar, wind, or hydro) directly to your utility supplied house system without an automatic relay that interrupts the alternative source in the event of utility outage. If you plan to install the complete residential system later, you could withstand the price of the switching gear and associated wiring, albeit there maybe need for additional interruption and wiring when installing the whole-house system.

Micro inverters are the new "sliced bread" for photovoltaic systems and there are certainly benefits as well as downsides. Upsides--power inverted at the module means less expensive wiring, output continually delivered from remainder of module string if only a few modules are shaded, and scaling if installing part system or upgrading is needed. Downsides---cost, possible durability issues, and the micro inverters are controlled through network based switching. The whole adds up to be a negative when applying to RV use.

I'd suggest, if embarking on solar power usage, to keep it simple. Design your initial solar as to the usage in the RV and design the residential system to it's own characteristics. While you are installing the residential system, you can keep in mind the output of the secondary output of a couple of modules and possibly integrate that into the house system. You will have connectivity to overcome when using the secondary source (parked RV to house distribution--you wouldn't want just a live 120V wire strung across the property). I think you would also find that the ROI for this secondary power addition to rule out it's use to grid tie.

Good luck with the solar, it's one of the better mods I've done for my RV.