OK here you go. Top drawing is a Floating DC System, and the bottom is a Grounded DC System.
GEC = Ground Electrode Conductor. For your application minimum size is 10 AWG but can be as large as you like. I forgot to talk about the panel, but it needs a GEC same size as the one to the AC panel. The GEC is to reference the equipment to earth to minimize touch potential voltages, and provide a path to earth for lightning. Only question I have is does this AC panel connect to the grid, or will it be in the future. If so you will have to use a 6 AWG instead of a #10 AWG
Bonding Jumper is the one that makes the system Grounded or Floating. It shall be the same size or larger as the largest conductor used for Power. So if you wire between the battery and Inverter is #6 AWG, it must be a minimum of a 6 AWG.
DCEGC = DC Equipment Ground Conductor. Must be sized same as power conductors. If the batteries wires from the controller to battery is #12 AWG, the Controller DCEGC must be a minimum #12 AWG. If the Inverter DC power wires is a 6AWG, the Inverter DCEGC must be a minimum #6 AWG.
So if you want to make life easy, you can use #6 AWG for all ground and power wires.
EDIT NOTE: Ignore the Bonding Jumper between the AC Ground Bus and Neutral. It is already there and only shown to drive home that is what makes it a Ground System.
GEC = Ground Electrode Conductor. For your application minimum size is 10 AWG but can be as large as you like. I forgot to talk about the panel, but it needs a GEC same size as the one to the AC panel. The GEC is to reference the equipment to earth to minimize touch potential voltages, and provide a path to earth for lightning. Only question I have is does this AC panel connect to the grid, or will it be in the future. If so you will have to use a 6 AWG instead of a #10 AWG
Bonding Jumper is the one that makes the system Grounded or Floating. It shall be the same size or larger as the largest conductor used for Power. So if you wire between the battery and Inverter is #6 AWG, it must be a minimum of a 6 AWG.
DCEGC = DC Equipment Ground Conductor. Must be sized same as power conductors. If the batteries wires from the controller to battery is #12 AWG, the Controller DCEGC must be a minimum #12 AWG. If the Inverter DC power wires is a 6AWG, the Inverter DCEGC must be a minimum #6 AWG.
So if you want to make life easy, you can use #6 AWG for all ground and power wires.
EDIT NOTE: Ignore the Bonding Jumper between the AC Ground Bus and Neutral. It is already there and only shown to drive home that is what makes it a Ground System.
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