Sorry my friend, I'm gonna bitch about a complete lack of documentation of the RSD function in the box.
This is not an expertise problem. The book sez something about a radio controlled RSD device built into the box and a couple of pins you can hook a switch to. No examples, no explanation of what one might wire to the pins... A momentary switch? Here's a picture of some box by some other company that interacts in some way with this thing, you can use one of them. How do you reset it if you trip it? How does it interact with the RSD switch(?) on the side? And the big rotary switch? I'm sorry but this is not something you should be making an educated guess about because you are an expert. That is how people get killed. They added a couple of random paragraphs in the V1.3 manual. So this probably goes here. (poof).
Every single connection and switch on *ANY* device that has the potential to kill you if you screw up should be documented in the manual as to it's function, how and what you might connect it to with an example. You don't have to have a book for each, nor explain power calculations with Ohms law. Something like: "This rotary switch on the left (show pic) is the master PV disconnect. When in the off position all PV inputs are disconnected from the internal PV bus/MPPT's. When on the MPPT's will receive current. The push-button switch next to the rotary switch (picture/arrow) (does something, not sure, I haven't pressed it and got happy with a multi-meter) might activate RSD, which performs some internal voodoo that blows up your inverter, requires you to ...
On the other hand they do spend a bit of time on things like wire sizes, which would actually be generally commonly understood by someone with prior experience. The organization of the manual is pretty bad as well. It starts out pretty decent, describing the mounting, then kind of runs all over the place. Tell them what you are going to tell them. Tell Them. Tell them what you told them.
Until I watched a youtube video I had no idea how the PV connections worked. I mean pretty slick, but a couple of still pics with a flat blade screwdriver showing someone inserting the wire below would have been nice, with an actual picture of an actual wire in the clip. Fortunately there were lots of pictures of the battery and AC cables that attach with a hex nut that would be commonly understood by anyone with some electrical experience. It causes frustration when you document well things most people understand, and then fail to document the things that are quite different about the product, or that may be confusing.
