Problems powering notepad with UPS in cabin

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Originally Posted by wagoo

Is there a significant difference in power consumption between the invertor and the DC adaptor ?
I ended up having to buy a Power Tech inverter to power my daughters high school leased Apple Mac laptop because no one including Apple themselves seems to make or sell a DC adaptor with a 4 pin flat plug to suit.
Bill.

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I think my question has just been answered.The inverter has just shut power off to the daughters laptop after only 4 hrs. And that is with 2 13 volt car batteries in parralell.
My previous arrangement of battery bank/1000watt inverter 240 volt supply to everything was less power hungry than what I have now.:mad:
Bill.