I think that the simplest solution is to buy an off the shelf uninterruptable power supply (UPS) from someplace like Best Buy in the 1000 VA range such as an APC Smart-UPS 750VA USB & Serial 120V. It will run a normal CPAP without the heated humidifier for 8 - 10 hours. If the power goes off an alar...

The shallow cushion looks almost identical to the standard one. The difference is in the size and the shape of the cut out for your nose.

I have quite a bit of experience with lead-acid batteries in enclosed spaces through my work with undersea vehicles. Lead-acid batteries do not produce sulfuric acid vapors unless they are severely overcharged at a rate that is sufficient to boil the electrolyte. Lead-Acid batteries are not a hazard...

If you can recharge the battery each day you only need to be able to put one day's worth of power into it. (Not obvious to everyone). Assuming your CPAP draws 1.5 amps for 8 hours every night you will need to pump 12 amp hours (AH) into the battery. Since battery charging is not 100% efficient (if y...

For camping I use a PB 420, no HH, connected directly to a 36 AH, 12v sealed AGM battery. The CPAP draws 0.7 amps at a setting of 12 cm H2O. The battery weighs 28 pounds. I easily get 5 nights out of this setup. Some helpful (?) notes: * Inverters are not terrably efficient so you will get the most ...

I have been using the Activa for about 8 months and here is my experience. With respect to pressure, I am on a pressure of 12 cm h20 and the mask inflates solidly against my face. A very low pressure might make it more prone to leaks. You will probably need to evaluate that yourself. I am a fairly a...