I hate to say this, but it should be known.....If you have a Dr certificate for your cpap, then it falls under the ADA and you can run a generator anytime to accommodate your disability, without fear of reprisal. Now, do I recommend this, ONLY if you have a 1kw Honda or equivalent that can not be heard in the next site and NO other means to operate your cpap. I operate mine, including the humidifier set on 2, on my battery bank and have no problems going multiple days. Mine can be operated on either 120vac or 12vdc. I did install a dedicated 12v power point beside the bed, so I would not have to use the inverter, which is a power hog in itself.