Those switches look like what I used as my new master switch, except mine is
DPDT. I could use one to power two separate busses from two separate
batteries.


"JS" wrote in message
...
How about this, diagram below.
Each battery should have its own fuse.
Switches are drawn as -o\-
Vertical line is the Master bus.
Optional PV charge controller charges the active battery, whether avionics
are on or off.
I'd suggest locking switches like Alcoswitch MTL106D available from Mouser
for $12.60.
Jim

Bat 1 -----o\-----|
Bat 2 -----o\-----|
Bat 3 -----o\-----|
|-----o\----- Avionics
PV Charger -------|