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Regarding your CPAP: it is basically a fan. Look onyour literature that came with the CPAP and find out how many watts the unit requires. Then go to Walmart, Costco or like store and buy a 12v power inverter that will handle the wattage. We bought one at Walmart that our son uses in the car when traveling to power his PSP, laptop, etc.
Now the A/C can in no way ever be powered by your batteries.
Hope this helps.
Mary
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