OK to plug machine into a UPS?

[RayBee]

CPAP equipment couldn't give a rat's patoot if you plug it into "pure sine wave" form current or stepped or jumped sine wave form current.

My ResMed power supply says its input can be 100 - 240 vac and 50 - 60 Hz. That tells me it is a switching power supply, similar to one provided with laptops, and can probably digest any sort of input I can throw at it. Of course within those specified limits. So I would be comfortable with my ResMed AirCurve 10 running on a modified sine wave UPS with no ill effects.

I don't own a PR CPAP, but the same analogy would go for it. If your PAP device had ratings similar to my ResMed machine, then go for it. Worst case, if the power supply died, which I doubt it would, they are pretty cheap to replace. And I would say it is extremely unlikely that your PR power supply (or ResMed power supply) would send anything to the PAP device of a destructive nature. I think if any of that were the case, we would see a lot of posts on this forum warning not to use a modified sine wave UPS on our devices. And I am sure there are a significant number of members here successfully using cheaper UPS's without a hitch.

Just be sure to size the UPS appropriately to cover a power hiccup or long term outage - whatever your needs require.

[OMyMyOHellYes]

These machines use straight up DC, not AC or any type. And those transformers really don't care what you feed them, within voltage design specs.

[sovkiller]

CPAP equipment couldn't give a rat's patoot if you plug it into "pure sine wave" form current or stepped or jumped sine wave form current.

Most of the times they use cheap pulse power supplies that will filter the waves to make the DC that the actual machine works with...the point is what capacity yiu need fos a whole night or two...???