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Hi,
I have a t41, I went to Dick Smith and they have a DC/DC adaptor kit. It comes in a small case and has a set of replaceable fuses so you can match the output required for the laptop. It also has a number of plugs to suit various models.
It has a male ciggie plug. I use this with a 26 AH deep cycle battery from Jaycar. The other night i powered my laptop and SBIG cooled camera from around 10 pm until around 5 am the next morning. 7 hours continuous use guiding by running CCDSOFT, occasional forays into maxim to stack and view my data and running a cooled camera is pretty good.
This is much more efficient than running off an inverter. The unit was a bit expensive at 90 bucks but does a great job.
Paul
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