Thanks Alan and Simon.
Simon, a solar power generator with a good deep cycle battery is an excellent alternative, but out of my current price range.
I have a couple of "jump starters" (1100 amp and 1900 amp), but with the computer, mount, camera and giuiding all running (even in eco mode) I get less than two hours of power.
Alan, I've taken your suggestion re extra power and I've done some more "research" and will probably go with this one. It's 3.4KVA, the quality seems a lot better and there are two 240v outlets, although it does have an unusual 12v outlet socket. They are a Melbourne dealer with a shop front - and FREE shipping. The only down side is the weight, at 27 kg.
http://www.toolhq.com.au/p-2098-neva...t-camping.aspx
Clear skies, merry christmas
Rod
