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Old 05-21-2020, 04:35 PM   #1
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Join Date: Jul 2018
Location: Alberta
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Default Power source for CPAP machines

Im looking for a power source to run my CPAP machine while boondocking. Can someone recommend the best model of small rechargeable battery power that I could use? Id like to be able to use it for other things besides my machine. Id rather not have to pay a fortune either.

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Old 05-22-2020, 01:16 AM   #2
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Join Date: Aug 2019
Location: Twin Cities
Posts: 14

Overall CPAP machines are very adaptable to various power levels. 1. use a 120v with inverter on. This is kind of a power pig because of just running the inverter/converter in the RV. 2nd option, I plugged a portable 300w inverter in a 12v source, it worked great last year in a rented 2019 Roadtrek Simplicity. 3rd option; Now that we bought a Carado Banff, I bought a Shielded DC Cord for $27.

Portable Inverter was $25 (I now have this mounted in my 2016 4Runner for 110v power)

Also know that your CPAP will also work in Europe with their 240v, just bring a plug converter. Again they are adaptable.

2018 Carado Banff with EcoTrek
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Old 05-26-2020, 04:05 AM   #3
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Location: CA
Posts: 181
Default Power source for CPAP machines

Over the last few years I have run 3 different CPAP machines off of batteries. Without humidification, I have found that about 100Wh of battery capacity is good for a night.

If you have 12V batteries, this is about 100Wh / 12V = 8 Ah. On my 2 recent class B RVs, this is less than about 10% of usable battery capacity for one night.

So the question becomes how big is your battery bank, how do you recharge it, and how much energy do the other uses take?

In my case, I rarely stay in one place for more than one night and the combination of the alternator and the solar panels let my CPAP run overnight, lets my fridge stay cool and runs the bit of lighting needed. And enough to make coffee in the morning.

Tell us more about your equipment and uses and we can help more.
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