Thanks for all the comments and suggestions guys, great info.
I have just checked the adaptor that I have for my laptop and in fact I think that it draws 13.8V at 10 amps and converts this for the laptop to 15 volts 5 amps.
In any case it sounds like 3 hrs is not too bad.
My JMI NGT scope has a Losmandy drive which I think draws 5 amps, so will now try both together.
Would say that if I get into full blown astrophotography that I will need a 34 amp unit or better, or an additional 17 hr amp unit.
Any other suppliers that you know of in Melbourne? or is there a way to put together a 60+ amp rechargable battery unit?
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