ResMed Compact Bilevel Device VPAP Auto User Manual

VPAP Auto

Battery Guide

™

Indoors, outdoors or in transit—your
VPAP Auto can give you effective
therapy wherever you are.

Some simple accessories, used with a
battery or an uninterruptible power
supply (UPS), can help you use your
VPAP Auto even where mains
electricity is unavailable or unreliable.

What do I need?

Precisely what setup you require depends on
where you intend using your VPAP Auto and
whether you use a heated humidifier. The diagram
below shows the various options.

AC mains

VPAP

Auto

H3i

VPAP

Auto

H3i

VPAP

Auto

Using a battery with VPAP Auto

Inverter

An inverter adapts the 12/24V direct current (DC)
supplied by the battery into 110/240V alternating
current (AC) that powers your VPAP Auto.

Uninterruptible Power Supply (UPS)

A UPS consists of an inverter, a battery and a
battery charger. It is designed to supply power
automatically in the event of power loss.

Consider a UPS in situations where the AC
power supply (standard mains electricity) is
intermittent or unreliable.

Table A:Types of Inverters

Output Power Rating:

Setup Output wave

Continuous/Peak

VPAP Auto
(without

Modified or pure
sine wave

60W/225W

humidifier)

VPAP Auto
with
HumidAire 3i

Pure sine wave:
110V

TM

Pure sine wave:

150W/500W

150W/500W

240V

Converter

The VPAP Auto has a 24V DC power socket which
allows the connection of a 12V or 24V DC power
supply (ie, battery) using the ResMed
DC-12 Converter.

Converters are more efficient than inverters and
ResMed recommends that you use the DC-12
Converter if you are using a VPAP Auto
without a humidifier. The HumidAire 3i will not be
heated unless you use an inverter or UPS.

Battery

ResMed recommends using either a 12V or 24V
deep-cycle battery. The battery capacity that you
will require depends on your system’s power
consumption (see Table B). You will need a
charger for your battery.

Can I use my humidifier with battery
power?

Yes (Note: Only the HumidAire 3i integrated
heated humidifier is compatible with the VPAP
Auto). You will require a larger capacity battery

and a more highly rated inverter.

No power will be supplied to your humidifier if
your VPAP Auto is connected to a converter.

How do I connect my VPAP Auto
to the battery?

Connect the inverter or converter to a battery using
the Battery Adapter Cable, then connect your VPAP
Auto to the inverter/converter. Be careful to match
the polarity (+ and -) symbols correctly between
the adapter cable and the battery.

Which inverter (or UPS) should I use?

The type of inverter that you need depends on
your VPAP Auto setup. Table A lists the minimum
specifications for an inverter/UPS.

When purchasing an inverter please ensure that:

• the inverter is certified by an accredited
certification body (eg, CE, UL)

• the inverter’s case temperature is specified as
less than 50ºC at an ambient temperature of 35ºC.

Can I connect my VPAP Auto

to a vehicle or boat battery?

Yes, but standard automotive batteries are
generally unsuitable for therapy requirements;
continual use of an automotive battery can
shorten its lifespan and the therapy delivered
may not be adequate.

If you are using your VPAP Auto in, or close to, a
vehicle, you should consider a dual-battery set up.
Consult an automotive or marine electrician for
details about installing a dual-battery system.

Most converters and inverters are supplied with a
plug for an automobile cigarette lighter socket.

Ordering details

The Battery Adapter Cable (product code: 22006)
and the ResMed DC-12 Converter (product code:

33942) can be purchased through your ResMed

distributor.

Battery capacity

Use Table B (VAuto mode) to estimate the battery
capacity (amp-hours) required to power your VPAP
Auto.

VAuto mode: Select the pressure value that is
closest to your 95th percentile AutoSet Pressure,
then read the required battery capacity for your
Pressure Support setting. (Your managing
physician can help you find your 95th percentile
AutoSet Pressure.)

The ‘8 hr’ column shows the requirement for 8
hours of operation, including a 50% safety
margin. If you will be using your VPAP Auto for a
longer or shorter period, calculate the battery
capacity that you will require by using the steps in
‘Calculate your battery requirements’.

The ‘current draw’ column shows the electrical
current consumption at 12V DC.

• This is a per/hr value. Always add a 50%
safety margin when calculating battery size.

• If you are using a 24V battery, the current
draw value is halved.

The values in the tables are calculated for a
respiratory rate of 15 breaths per minute.

Example:

You use your VPAP Auto in VAuto mode, for 6
hours without a humidifier, using an inverter.
95th centile AutoSet Pressure is 9 cm H
and Pressure Support is 3.
Note: Use values for AutoSetP=10, and PS=4.

1.07 amps x 6 hours = 6.42 amp-hours
Add the 50% safety margin:

6.92 x 1.5 = 9.63 amp-hours
You require a battery with a capacity of at
least 10 amp-hours.

O,

2

Table B: Minimum Recommended Battery Capacity
(VAuto mode)

AUTOSET PRESSURE<=10 AUTOSET PRESSURE>10

PS

(cm H2O)

1. Using an inverter

current draw

at 12V DC

(amps)

8 hr

(amp-hours)

current draw

at 12V DC

(amps)

8 hr

(amp-hours)

2 0.89 11 1.40 17

4 0.87 10 1.32 16

6 0.86 10 1.23 15

8 0.89 11 1.17 14

10 0.85 10 1.07 13

2. Using an inverter with a HumidAire 3i

2 8.59 103 8.85 106

4 8.59 103 8.85 106

6 8.59 103 8.85 106

8 8.59 103 8.85 106

10 8.59 103 8.85 106

3. Using the ResMed DC-12 Converter

2 0.67 8 1.15 14

4 0.69 8 1.10 13

6 0.69 8 1.03 12

8 0.67 8 0.95 11

10 0.63 8 0.90 11

Calculate your battery requirements

1. Inverter or converter?
Using a HumidAire 3i with VPAP Auto:

Yes Inverter only

No Converter or inverter

2. What is my VPAP Auto’s current draw?

Table B shows the current draw with a 12V battery.

The current draw is halved with a 24V battery.

(VAuto) AutoSet Pressure: ...... cm H2O

(VAuto) Pressure Support: ...... cm H2O

Current draw: ...... amps

3. VPAP Auto used for.... ...... hours

4. Battery capacity

Use your values from (2) and (3) to calculate:

...... amps x ........ hours x 1.5 = ...... amp-hours

(Current x usage hours x safety margin)

This ‘amp-hours’ value is the battery capacity we

recommend to run your VPAP Auto.

Need further information?

If you would like more information about
powering your VPAP Auto with a battery,
please contact your ResMed representative.

ResMed Corp Poway, CA, USA [phone] or 1 800 424 0737 (toll free), ResMed Ltd Bella
Vista, NSW, Australia, [phone] or 1 800 658 189 (toll free). Offices in Austria, Brazil,
China, Finland, France, Germany, Hong Kong, India, Japan, Malaysia, Netherlands, New Zealand,
Norway, Singapore, Spain, Sweden, Switzerland, United Kingdom (see website for details).
AutoSet, HumidAire and VPAP Auto are trademarks of ResMed Ltd and AutoSet, HumidAire and
VPAP are registered in the US Patent and Trademark Office. Specifications may change without
notice. ©2008 ResMed Ltd. 268159/1 08 01

Global leaders in sleep and respiratory medicine www.resmed.com