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Just for the record I went to Jaycar and bought an inverter with a capacity of 500w (constant running) and a power surge of 1000w. The inverter has alligator clips that connect straight to a neat little 12v car battery with handles. I have an extension board running from the inverter with my motor drive (under 100w) and laptop and hair dryer (one of those Chinese foldable poratble ones @ 400w) all plugged in. I had it all up and running for a few hours last night and it all went all a okay!
This set up elimates a need to purchase a 6v and 12v battery for separate devices. All up cost was under $200 (just).
thanks all for your advice I ended up going with a couple of suggestions and rolled them up into one, without your advice a way forward would have been a lot more labour intensive.
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