I use a large 12v battery to power my G11, Gemini, Laptop et. al. and feed it directly to my QSI 540wsg. I'm not sure what swg the wire to the camera is (about 16) but I've had no problems so far. For devices that use different to 12v, I use the Jaycar 12v to '5v - 19v' inverters and one of the supplied connectors fits the camera nicely.
Charles
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