Note that the OpenPPG now comes with two switches, and that the community has come up with an idea of how to prevent the arcing effect, when turning on the power circuit (a lot of current going from the batteries to charge the capacitors when connecting the circuit), and that is the pre-charge solution
with a 22 ohm Resistor and a special 3D printed switch with a very smart feature
Thanks @GliderPilot
(explanation and files here: Paul B & Braedin B (GliderPilot & Glydrfreak) Flights & Build Modifications - #76 by GliderPilot)
So my two sets of 8 AWG wires are on one hand to dissipate the current onto two sets of wires,
and to be able to connect both switches to the battery at the same time.