Battery Backup Resmed S8

From what I have read, when using a Resmed S8 Autoset II, you need an inverter if you are not using the humidifier and you need a converter if you are using the humidifier. This is very confusing to me and I do not want to damage my equipment.

If someone has a battery backup system in use with the Resmed S8 Autoset with the humidifier, can you describe what products I need to purchase.

Thanks so much,
Gail

http://www.resmed.com/en-us/products/se ... ttery.html

You may need to click on the link to the more-detailed pdf file at the bottom of that page.

The problem (and I share it with you, I have a Vantage and Humid Aire 3) is that the ResMed Vantage/HumidAire 3 ABSOLUTELY, POSITIVELY REQUIRE a pure sine wave power source. Modified sine wave (and nearly all the common power converters/inverters put out a modified sine wave) will not work and will damage the machine. The humidifier won't work on DC at all. You CAN use the Vantage ALONE with a 12 V deep cycle battery, as long as you use their DC power converter/cable (the polarity on the ResMed's DC socket is reversed). The ResMed DC cable takes care of that, and holds the voltage to a tightly controlled range. It plugs into the DC socket on the Vantage and connects to the posts on the 12V battery.

So, you can use the deep cycle battery and the Resmed converter/cable plugged in to the Vantage's DC socket, but NOT with the humidifier connected;

or

you can use the deep cycle battery, a PURE SINE WAVE power inverter -- DC to AC -- with the Vantage's AC cord plugged into the inverter and the humidifier connected as usual.

Don't forget a battery charger for the battery. The battery should be either a deep cycle gelled battery or a deep cycle Absorbed Glass Mat (AGM) battery... both types are sealed, don't spill even if tipped over or cracked and do not emit hydrogen gas when charged. Normal lead acid batteries do, and should not be charged in an enclosed room.

Here is ResMed's white paper on battery power:
http://www.resmed.com/en-us/products/se ... ttery.html
At the bottom of that page is a link to a pdf file that is very complete and describes exactly what you need.

All this will cost about $450-500. The pure sine wave inverters are pricey $130, and a charger meant specifically for a gelled or AGM battery will run about $100, the battery (50 amp hours or greater) will run about $130-180, and the ResMed cable is $80.

Hope that helps!

Bookbear wrote:Here is ResMed's white paper on battery power:
http://www.resmed.com/en-us/products/se ... ttery.html
At the bottom of that page is a link to a pdf file that is very complete and describes exactly what you need.

Can you find that link again? It doesn't work the way you posted it.

All this will cost about $450-500. The pure sine wave inverters are pricey $130, and a charger meant specifically for a gelled or AGM battery will run about $100, the battery (50 amp hours or greater) will run about $130-180, and the ResMed cable is $80.

Hope that helps!

That does help. But why do you need the $80 ResMed cable? Can't you just plug the regular AC cable into the inverter?

LoQ wrote:Can you find that link again? It doesn't work the way you posted it.

It's the same one that was posted a few messages earlier in this thread...

http://www.resmed.com/en-us/products/se ... ttery.html

LoQ wrote:But why do you need the $80 ResMed cable? Can't you just plug the regular AC cable into the inverter?

If you run off the AC output of a pure sine wave inverter, you don't need a Resmed DC-12 adapter.

Cheers,

Bill

LoQ wrote: Can you find that link again? It doesn't work the way you posted it.

http://www.resmed.com/en-us/products/se ... ttery.html

That does help. But why do you need the $80 ResMed cable? Can't you just plug the regular AC cable into the inverter?

As I said, you can use the Vantage ALONE with a 12 V deep cycle battery, as long as you use their DC power converter/cable (the polarity on the ResMed's DC socket is reversed). That is, the opposite of all other cpaps. Nearly any generic cable would be the opposite polarity that the ResMed would need. The ResMed DC cable takes care of that, and holds the voltage to a tightly controlled range. It plugs into the DC socket on the Vantage and connects to the posts on the 12V battery.

Could of course cut the wires to a third party cable and reverse the polarity of the plug that fits into the Vantage's socket. The Resmed cable does keep the voltage from straying outside a pretty tightly controlled range.

Ah. Thanks for the responses.