So I would run 8 wires from the arrays to the 18kpv? I've already ordered 1,000' of red and 1,000' of black which should be just enough to do that.If you are using those panels with the 18kpv inverter, then you don't need a combiner. 4 strings of 8 panels in series, can be wired directly to the 18kpv MPPT inputs. you want a disconnect where the PV circuits enter a building, like the IMO DC Solar Isolator SI32-PEL64R-8 4 String 32A