VPAP Battery Guide Aug 2010


2 Pages

Battery capacity  Calculate your battery requirements  Use Table B to estimate the battery capacity (amp-hours) required to power your VPAP.  1. Inverter or converter? Using H4i: Yes Inverter only No Converter or inverter  Simply find the part of the table that matches your setup then read the required battery capacity for your IPAP pressure. The ‘4 hrs’ and ‘8 hrs’ columns show the requirement for 4 or 8 hours of operation respectively, including a 50% safety margin. If you will be using your VPAP for a longer or shorter period, calculate the battery capacity that you will require by using the steps in ‘Calculate your battery requirements’.  2. What is my VPAP’s current draw? Table B shows the current draw for IPAP values with a 12V battery. The current draw is halved with a 24V battery. IPAP Pressure:... cm H2O Current draw:... amps 3. VPAP used for... hours  • This is a per/hr rate of consumption. Always add a 50% safety margin when calculating battery size.  4. Battery capacity Use your values from (2) and (3) to calculate: ... amps x ... hours x 1.5 = ... amp-hours  • If you are using a 24V battery, the current draw value is halved.  This ‘amp-hours’ value is the battery capacity we recommend to run your VPAP.  Example: You use your VPAP for 8 hours without H4i and with Resmed DC-24 Converter. IPAP is 12 cm H2O. Note: Use the value for IPAP = 15. 1.2 amps x 8 hours = 9.6 amp-hours Add the 50% safety margin: 9.6 x 1.5 = 14.4 amp-hours You require a battery with a capacity of at least 14 amp-hours.  VPAP Auto 25  Table B: Minimum recommended battery capacity  1. Using the ResMed DC-24 Converter  VPAP ST  IPAP  VPAP S  (cm H2O / hPa)  Current at 12V DC (amps)  4 hrs (amp-hours)  8 hrs (amp-hours)  10  1  6  12  15  1.2  7  14  20  1.5  9  18  25  1.8  11  22  VPAP IV ST VPAP IV  2. Using an inverter (without H4i)  IPAP  The ‘current draw’ column shows the electrical current consumption at 12V DC.  The values in the tables are calculated for a respiratory rate of 20 breaths per minute.  ­VPAP™ Battery Guide  (Current x usage hours x safety margin)  (cm H2O / hPa)  Current at 12V DC (amps)  4 hrs (amp-hours)  8 hrs (amp-hours)  10  1.4  8  16  15  1.6  10  19  20  1.9  11  22  25  2.2  13  26  3. Using an inverter (with H4i) at IPAP cm H20/hPa  Need further information? If you would like more information about powering your VPAP with a battery, please contact your ResMed representative. Manufacturer: ResMed Ltd 1 Elizabeth Macarthur Drive Bella Vista NSW 2153 Australia Distributed by: ResMed Corp 14040 Danielson Street Poway CA 92064-6857 USA ResMed (UK) Ltd 96 Milton Park Abingdon Oxfordshire OX14 4RY UK See for other ResMed locations worldwide. VPAP and HumidAire are trademarks of ResMed Ltd and are registered in the US Patent and Trademark Office. Specifications may change without notice. ©2008 ResMed Ltd. 268261/1 08 10  Global leaders in sleep and respiratory medicine  H4i Setting  Current at 12V DC (amps)  4 hrs (amp-hours)  8 hrs (amp-hours)  1  1.6  10  19  2  5.2  31  62  3  10.4  62  125  4  12.9  77  155  5  14.8  88  178  6  15.4  92  185  Note: Peak current may be higher during the warm-up.
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