can you please identify what these wires are for

[Yancy&Tamy]

I was dressing up all the cables in the front box of our new 390MP and found these two cables just cut off and in the mix of the rest. one is red and the other is black. Can you please tell me what these are for? I have attached two photos for your reference.
Thank,
Yancy

 

[Famtraveler24]

Those, I believe, are the + and - coming from the solar pre-wire box on the roof.

 

[Famtraveler24]

I'm more curious what all the other wires are that go into that hole. I'm a 390 owner as well. I intend to take off the panel on the basement side to explore that, as I need to reroute the DC connections.