How to: Inverters, CPAP machines and camping — OH MY!

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*Editor’s note: this is a guest post from AIMS power, which is The Inverter Store‘s sole supplier of inverter technology, solar panels and accessories. 

AIMS Power inverters keep CPAP users happy campers

How to use an inverter to power a CPAP machine while camping can be tricky and stressful no doubt. Creating a power system already requires very precise math but when someone’s life may be at stake, those calculations call for even more attention to detail.

The best advice AIMS Power can provide when creating a power system for a CPAP machine is: always overcompensate.

CPAP machines save lives, and AIMS Power inverters make it easy to use in places without standard power.


S9 VPAP™ Auto BiLevel Machine

This CPAP machine’s max consumption is 110 watts, and it needs to run continuously for seven hours every night for one week.

AIMS Power recommends our 300 watt 12 volt pure sine inverter for this CPAP machine.

In order to figure out how much battery power is needed to keep the CPAP running for that amount of time, finding the required amps per hour is necessary. To do this you divide the CPAP machine’s max consumption (110 watts) by the voltage of your batteries (12 volts).  Buy a battery bank from AIMS Power here.

110/12 = 9.2

So in this case, the CPAP machine requires 9.2 amps per hours.

This is where the overcompensating begins.

It would seemingly make sense to multiply the total number of hours sleeping per day (seven) by the amps used per hour in order to figure out the total amp hours needed to use the CPAP machine through the night. However, you actually want to multiply the required amps per hour by twice the amount of time sleeping, just to be safe.

9.2 x 14 = 128.2 total amp hours

The battery bank needs to be at least 128.2 amps to prevent overdischarge.

The overcompensation continues because batteries need to run at 30-50 percent of their actual capacity in order to maintain optimum efficiency and stability.

For that reason, using one 200 amp hour battery bank would be sufficient for this inverter application.

The batteries will also need to be recharged after the first night of use, and there are a number of ways that can be accomplished.

AIMS Power recommends two 120 volt solar panels and a solar charge controller to charge the batteries, but you can also use a generator or jumper cables from your car.

The biggest downfalls to the latter two options are that they’re both noisy and use a lot of gas. Another downfall to using a car’s standard charging system (12 volts) with jumper cables is that it can take a very long time to fully charge the batteries from dead.

CPAP users should be able to go camping, too, without having to worry about anything, let alone if they can trust their power system and inverter to keep them breathing properly at night.

Camping is a time for complete relaxation, and AIMS Power inverters truthfully help make that a reality for CPAP users.

There are several different types of CPAP machines which require different specifications and/or a pure sine inverter as opposed to a modified sine inverter. AIMS Power has tested many CPAP machines with our inverters, you can read them below.

CPAP machine tests: How to Choose a Power Inverter for a REMstar CPAP or ResMED CPAP

How to Choose a Power inverter for your DeVilbiss CPAP System

Power Inverter for Fisher & Paykel CPAP system

Choosing a Power Inverter for ResMed S9 CPAP

400 watt AIMS inverter to power your ResMed S9 CPAP Machine.

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