What you noted about the previous power converter is true. It converted power from 12V DC to 30V DC (or something odd like that). Apparently it was not reliable. So, they no longer sell it. I tried. But from the Battery Guide:FeistyWifey wrote:... What you recommend, however, is exactly what a camper or RVer recommended using. He said what ResMed recommended (pure sine wave) did not work because the power fluctuates. Said to install a 120 inverter directly into the battery. (ResMed's answer to that when I put it to them was, "The power only fluctuated because he didn't use pure sine wave!") I thought, Well so now what? Good to hear from a Adapt SV user, John. ...
But I am pretty certain my answer is correct. I did a lot of research before a recent international long flight. I found that:Note: ResMed no longer distributes converters for the AutoSet CS2 or VPAP Adapt SV.
- due to possible damage, American Airlines does not allow most medical equipment off power ports
- the power from the power ports is too low (75W) for the ASV unit
- to use the equipment in flight you need to talk with their disability service
- without the power port you need a battery that will drive the unit
- the power needed from a battery for the ASV unit would fairly large
- the compact batteries for such a setup is much more expensive than I wanted to spend on it !
60VA is the same as 60 Watts. I assume they require the 150W sustained supply to handle extra load and to simplify their suggestions. They recommend an inverter that will handle almost all their units. But it is still reasonably priced. (At least in comparison to the Pure Sine Wave Inverter).AC Input range: 110–120V and 220–240V; 50–60Hz; 60VA
The ResMed Battery Guide (see the link below) on page 13 notes the EEP pressure and average pressure. For example, my EEP is set to 8. But my average pressure runs about 10. That probably means average pressure support is about 4. So the third line in that table in the middle of page 13 shows without a humidifier a 26 amp hour deep cycle battery will last 8 hours. Since we sometimes loose power for a couple days in a row, I would want 16 hours. So a 52 amp hour battery will be what I hunt for.
By the way, although the 120W inverter might work, I suggest going with at least a 150W inverter. That way if you have problems you can tell ResMed you followed their documentation. They would then need to replace / repair the unit.
Oh, and just because a front line call center person says something does not mean they know jack about it. (Sorry to be rude, but their own document says otherwise and ResMed's engineers had to sign off on it).
As to whether this will work... well, I'm about to find out. I need to purchase a new deep cycle battery tomorrow (due to possible storm and power loss). I already have a 150W inverter. I used it with my CPAP and BiPAP units in the past. It should work. But I probably should get a fairly powerful deep cycle battery. (My unit pushes my inspiration pressure upto 23cm H2O, which will take more amp hours from the battery than if it stayed in a nice 10cm H2O range).
By the way, see the bottom of page 2 of the ResMed battery guide to see how it should be hooked up:
http://www.resmed.com/us/assets/documen ... lo_eng.pdf
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