Tied Together and the Power Inverters.
The two big black boxes are a 60 and an 80 amp solar charge Controller, the black box under the copper grounding bar is a unit that lets them communicate together. The two copper bars ties everything together, wind, solar, batteries and the inverters.
A couple of the inverters are over to the left. They change the 12 volt DC current to 110 volt AC for what needs that voltage to work.
From Yearly Photo's - 2014