ResMed
VPAP Battery Guide Aug 2010
Guide
2 Pages
Preview
Page 1
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 www.resmed.com 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
www.resmed.com
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.
Indoors, outdoors or in transit-your VPAP device can give you effective therapy wherever you are.
Converters are more efficient than inverters and ResMed recommends that you use the DC-24 Converter if you are using a VPAP without H4i.
to match the polarity (+ and -) symbols correctly between the adapter cable and the battery.
Some simple accessories, used with a battery or an uninterruptible power supply (UPS), can help you use your VPAP machine even where mains electricity is unavailable or unreliable.
Inverter
When lead-acid batteries discharge, they generate hydrogen gas. If this gas concentrates around the battery area, and sparks are created when connecting to battery terminals, then the potential for an explosion exists. To avoid this danger, always make the second connection to ground (battery negative) physically away from the battery to a metallic vehicle component.
An inverter adapts the 12/24V direct current (DC) supplied by the battery into the 110/240V alternating current (AC) that powers your VPAP. See Table A for the types of inverters available. Battery
What do I need? Precisely what setup you require depends on where you intend using it and whether you use HumidAire 4i™. The diagram below shows how to set up your VPAP with the various options. AC mains
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. This is mainly affected by the IPAP pressure and usage hours (see Table B). You will need a charger for your battery.
AC mains
4
AC mains
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.
Can I use my H4i with battery power? Yes. You will require a larger capacity battery and a more highly rated inverter.
4
Using a battery with VPAP Converter
The VPAP device has a 24V DC power socket which allows the connection of a 12V or 24V DC power supply (ie, battery) using the ResMed DC-24 Converter.
No power will be supplied to your H4i if it remains connected to your VPAP while using a converter.
How do I connect my VPAP to the battery? Connect the inverter or converter to a battery using the Battery Adapter Cable, then connect your VPAP to the inverter/converter. Be careful
Setup
WARNING
Which inverter (or UPS) should I use? The type of inverter that you need depends on your VPAP setup. Table A lists the minimum specifications for an inverter/UPS. When purchasing an inverter please ensure that:
Uninterruptible Power Supply (UPS)
Table A: Types of Inverters
• 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 to a vehicle or boat battery? Yes, but standard automotive batteries are generally unsuitable for therapy requirements; continual discharge of an automotive battery can shorten its lifespan and the therapy delivered may not be adequate. If you are using your VPAP in, or close to, a vehicle, you should consider a dual-battery set up using a deep-cycle battery. 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.
Output wave
Output Power Rating: Continuous/ Peak Setting
VPAP (without H4i)
Modified or pure 60W/180W sine wave
VPAP with H4i at 110V mains
Pure sine wave1 140W/260W
VPAP with Pure sine wave1 140W/500W2 H4i at 220/240V mains 1 The H4i requires a true sine wave inverter in order to
operate correctly. 2 For 220/240V inverter operation, the H4i can draw peak
battery currents of up to 76A at a 25% duty cycle (cycles at mains frequency - 6 cycles ON, followed by 18 cycles OFF). The inverter output needs to be capable of supplying such current peaks without sustaining component damage or protectively shutting down from either current or thermal overload protection.
Ordering details The Battery Adapter Cable (product code: 22006) and the ResMed DC-24 Converter (product code: 26932) can be purchased through your ResMed distributor.