Whoops! I thought I had the connections to the Thumper in my mind - not so. The
geography is different so of course I can't connect the inverter or the Ctek charger with the usual terminal clamps.
Called Solar Charge about whether I'd made the wrong purchase or whether they could fit the Anderson plugs to the wiring. They can do it and I'll just wait until I return from travelling to get the new plugs fitted. They are so easy to do business with - when I buy a new house, they will certainly be the likely suppliers of my new solar energy system.