Is it a main panel or a sub panel - solar inverters

[mesquito_creek]

I am wiring a breaker panel off of a solar inverter. In terms of grounding inside the box, do I treat it as a main and tie the ground bus and neutral bus together OR do I leave them separated like a sub panel? It's off grid with no connections to a ultilty. I also think that technically maybe it's considered a distribution box/panel? It’s currently wired separately in a floating configuration with no load or battery connected.

 

[The Chicken]

It's considered a main panel.
You want to bond your neutral and ground together at the point of entry to the building-the utility source.
Your inverter is the utility source in this case.
Since there is often not enough room to bond in the actual inverter, and most panels are built to readily be used as main or sub panels, the panel is an ideal and acceptable place to bond at.
Often, there is a green screw sticking out on the neutral buss that simply needs screwed in to complete the bonding.
It's important to note that this is the only location that your grounds and neutral should ever meet.
Floating neutrals or multiple bonding points can do some weird and unpleasant things.

 

[mesquito_creek]

I should note that the inverter does have both a dedicated Neutral and a dedicated Ground on the AC output connections... So I was going to drive a grounding rod into the earth and connect it to the ground busbar in the panel. But now I will tie the N and G together at the panel also....