Just out of curiosity, I went to Battery Power Solutions website and found the 12v DC power cable for my Philips Respironic Dreamstation. Their power cord on Amazon is $67.95 vs the Philips Respironic Dreamstation brand power cord on Amazon for $44.50. (I bought the Philips Respironic Dreamstation brand last January for $34.95. It has gone up.) While Battery Power Solutions may be a source, look at your model's manufacturer for an alternative source. I agree that this is a MUCH lower power draw than using a 120v inverter.