In the manual it says to hook up blk for Line 1 and red for Line 2. I have my inverters configured as 2P1 (Master) has the red wires, and 2P2 (Slave @ 180) has the black. Does Line 1 really have to be blk? My sub I'm connecting the inverters to have a blk and blue for 240. I was going to hook the blk to blk and red to blue. Is there a sine order I need to make sure I keep with the utility? If so, I may have to configure the inv with the blk wire as the master and the inv with the red wire as the slave 180...anyone know if it matters?