Hi Paul and welcome to IIS and Perth. I'm happy to help out as much as I can.
I use a deep cycle battery and a sine wave inverter to power laptops, mounts and cameras. What you're describing is a great idea- but I get by fine with the usual collection of alligator clips and sockets.
With the WO I would have thought a guide scope and camera were essential? Otherwise there's not much need for the laptop if the mount is just tracking.
If you're looking for a reasonable dark sky site only 90 mins from Perth PM me, and keep next Friday free.
I suspect from your username that we may be in the same industry...
Cheers,
Andrew.
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