Finished
Good:
All wiring ok.
Can switch each charger to be powered from laptop PSU (mains) power or via internal battery.
Can switch each all three charging outputs from XT60 or XT30 output.
Charger one can switched to charger internal battery. (30Ah at 12V)
Can discharge to storage voltage using usb fan and AOK will stop discharging at correct voltage (by lower batch of switches)
Have USB power out.
All self contained no other wiring or adapters needed for any functionality.
Bad:
Can not discharge from an external battery to internal as USB C negotiation on charger 1 has a suspected firmware bug. I deciding the extra wiring and extra switches to go from charger 2 to internal battery too tight to fit in.
Ugly:
I can not get every grey printed panel to sit 100% flat. As the wiring underneath is very tight to fit in and I used 1.5 mm cable below (I had some spare mains cable from another project)
Parts above the panels are held in by velcro pads.
