ResMed Compact Bilevel Device VPAP Auto - Manual (Page 6)

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
2
O,
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.
268159 VPAP Auto battery guide.qxp 7/12/2007 6:29 PM Page 1