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Thread: Invertor Generator

  1. #1
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    Invertor Generator

    Has anyone here had any experience at using an inverter generator, one of those small compact models around 800 - 1000 watt mark, to run a CPAP machine?
    I ma thinking of getting one to take on a trip to Stewart Island to either run the machine at night while I am sleeping or charge the battery for it daily. As extra batteries are ridiculous prices.

  2. #2
    Caretaker
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    4 stroke for sure

    The Honda or Yamaha will be the quietest and the most frugal with fuel

    I have used all sorts on hunting trips over the years and those are the two I would trust
    BRADS and mimms2 like this.
    A big fast bullet beats a little fast bullet every time

  3. #3
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    I dread to think of the fuel costs on Stewart Is and transporting a quantity of it and what does one do if it breaks down?

  4. #4
    Laminar
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    Hands-down: Honda.

    Not sure what's involved in the machines, but if it's compressors and such, with a high start up load then you'll need to size for that (can be 3-5x the running wattage). Ideally the full load you'll be putting on a genset is 75-90% of it's rated running capacity.
    - Probably taking the piss
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  5. #5
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    @DavidGunn just gone to $3.04 / l for 91..... I think the ferry can only take 60l total on the deck due to h&s with passengers.

  6. #6
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    ^This. Check ya rated wattage and the 'inrush' or startup current and make sure both are within rating for your CPAP unit. No point getting you to suck eggs on it, you'll know what you need to run the CPAP side of it but take a quick check on how long you need to run the genny to complete a full charge on the battery. Then work out what you need in terms of fuel burn for that run time, times number of days times 1.25 for reserve in case you tip the container or the like...

    Then consider if you can do the same thing another way!

  7. #7
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    Quote Originally Posted by Mauser308 View Post
    ^This. Check ya rated wattage and the 'inrush' or startup current and make sure both are within rating for your CPAP unit. No point getting you to suck eggs on it, you'll know what you need to run the CPAP side of it but take a quick check on how long you need to run the genny to complete a full charge on the battery. Then work out what you need in terms of fuel burn for that run time, times number of days times 1.25 for reserve in case you tip the container or the like...

    Then consider if you can do the same thing another way!
    Yep, I can borrow a yamaha one to try. Plant to run it for a few nights to see if it will drive the machine and then try to drive machine and charge battery . As I get 1.25 nights off the battery that may mean only running every 2nd night. The CPAP machine I use can run off 230V as well as having an adaptor to run off 12V so am guessing , rather hoping, if I run it off 12V it may not draw as much power. .Currently if I stay away off the grid I recharge the battery off a vehicle or bike daily but have been limited to only camping where I can get a vehicle to. So if worse comes to worse will just recharge the battery daily which should draw minimal power.
    Had 2 batteries which was good for 2.5 - 3 nights sleep but one of the batteries burnt the mother board out, and at $595 for another the generator may be a better long term option. Just putting it out there to see if anyone else has had similar problems.

  8. #8
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    The good thing is you will be able to take a leckie blanket to tuck into your sleeping bag and a TV....no point wasting that power.
    Maca49 and planenutz like this.

  9. #9
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    Only problem with them is the fuel cell usaly only holds enough for about a 4 hour run time. The older type aren't recommended for running electronics

  10. #10
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    Quote Originally Posted by Barrel View Post
    Has anyone here had any experience at using an inverter generator, one of those small compact models around 800 - 1000 watt mark, to run a CPAP machine?
    I ma thinking of getting one to take on a trip to Stewart Island to either run the machine at night while I am sleeping or charge the battery for it daily. As extra batteries are ridiculous prices.
    I know a guy with a CPAP machine and he just runs it off a 12v battery while staying away in his camper. Has a solar panel he puts out during the day to charge the battery. Would be a better way of doing it than a generator.
    Maca49, Cordite and mimms2 like this.

  11. #11
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    As NZ32 says: somewhere on the CPAP will be the wattage draw (Google says between 30 and 60 watts). Thats a silly small draw on any generator. You may be better off with a decent deep cycle battery (or lithium, as it will last you forever, and can power a multitude bits of kit around base camp) and a solar panel (decent size)

  12. #12
    Laminar
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    Have to disagree on lithium "lasting forever"... I think jury is still out on them. And they can explode fantastically.
    Their big benefit is lightweight and high current output.

    60watts* 12hours bed/sleep = 720 Watt-hours you need to charge +50% overprovisined/spare =1080 which you need to catch in ~5 hours of good sun.
    220 odd watts of panels. If space allows I'd go 2x 150 on a bracket which has them at correct tilt for lattitude and one each angled NNE and NNW.
    On a 12V battery that's only 90 Amp-hours which is a pretty small battery. Car size batteries are avail up to about 225Ah.
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  13. #13
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    Buy a Tesla and run it off the cigar lighter, go Honda, but there are a few good, cheaper ones around, Trade Tested isnít one.
    Boom, cough,cough,cough

  14. #14
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    the hyundai genie i had was great but it was 6500w version so too big to lug around. could you not just get a gell cell battery to hook up as a secondary so you could take a small solar panel to charge each battery over a couple days?
    Maca49 likes this.

  15. #15
    Laminar
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    I got stung by a savebarn 5kva? diesel. Told them it was shit, they went and tested it and sent back a scope reading showing 400+ volt spikes saying it was "within spec"!!!

    AVR (and the rest of the electrics) has since gone so had to dial in the voltage using mechanical governor on the motor.

    Gets what ya pays for but certainly wouldn't hook any sensitive elextronics to it!
    - Probably taking the piss
    Diligentia Vis Celeritas
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