Went down to Solar Charge today and Richard arranged to fit Anderson plugs to both the Inverter and the CTek while I waited. They cost $20 each - easily done and I'm very happy with the service.
The battery charger has the option to fit either the Anderson plug or the terminal clamps using a one-way only type of fitting so that polarity cannot be reversed.
Now we can incorporate these two items into the next journey.
Anderson plug (small)
Inverter
Charger
Terminal clamps