Running fridge/freezer on inverter

Discussion in 'Home Power and Microgeneration' started by AC/DCdude17, Jan 18, 2004.

  1. AC/DCdude17

    AC/DCdude17 Guest

    We got our share of snow in my area and many people had an outage
    lasting quite a while. I'd like to be able to power a freezer on
    inverter powered from car battery for extended outages. My freezer takes
    115W, 145VA to sustain operation, but the compressor is rated at
    7.5LRA(locked rotor amps, which you can use to estimate your
    fridge/freezer's peak power requirement) and I guess that comes to 900
    peak watt.


    The 140W inverter I mainly use for charging digital camera
    batteries in my car definitely won't start this freezer, but my
    700W(1000W peak) inverter can start it(barely.. it beeps when the freezer
    starts). Is there anyway I can run a freezer/refrigerator on an inverter
    short of getting an inverter with a peak wattage that can accomodate 120V
    * compressor's LRA? It's really foolish having to dedicate a 700W(1000W
    peak) inverter for a 115W freezer.


    Searching the internet showed there's an "easy start kit" that lower's
    peak current by starting compressor slowly, but I haven't been able to
    find any.

    I suppose I could use a series reactor to restrict the starting current
    but could the comrpessor start up with restricted starting current?
    AC/DCdude17, Jan 18, 2004
    #1
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  2. AC/DCdude17

    Chris Hill Guest

    On Sun, 18 Jan 2004 09:12:36 GMT, AC/DCdude17
    <> wrote:

    > We got our share of snow in my area and many people had an outage
    >lasting quite a while. I'd like to be able to power a freezer on
    >inverter powered from car battery for extended outages. My freezer takes
    >115W, 145VA to sustain operation, but the compressor is rated at
    >7.5LRA(locked rotor amps, which you can use to estimate your
    >fridge/freezer's peak power requirement) and I guess that comes to 900
    >peak watt.
    >
    >
    > The 140W inverter I mainly use for charging digital camera
    >batteries in my car definitely won't start this freezer, but my
    >700W(1000W peak) inverter can start it(barely.. it beeps when the freezer
    >starts). Is there anyway I can run a freezer/refrigerator on an inverter
    >short of getting an inverter with a peak wattage that can accomodate 120V
    >* compressor's LRA? It's really foolish having to dedicate a 700W(1000W
    >peak) inverter for a 115W freezer.
    >
    >
    >Searching the internet showed there's an "easy start kit" that lower's
    >peak current by starting compressor slowly, but I haven't been able to
    >find any.


    You aren't losing much by using the inverter that is properly sized
    for the job. Remember too that the wiring to the inverter must be
    properly sized for the job, I suspect that is what your problem really
    is.>
    Chris Hill, Jan 18, 2004
    #2
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  3. AC/DCdude17

    SQLit Guest

    "AC/DCdude17" <> wrote in message
    news:...
    > We got our share of snow in my area and many people had an outage
    > lasting quite a while. I'd like to be able to power a freezer on
    > inverter powered from car battery for extended outages. My freezer takes
    > 115W, 145VA to sustain operation, but the compressor is rated at
    > 7.5LRA(locked rotor amps, which you can use to estimate your
    > fridge/freezer's peak power requirement) and I guess that comes to 900
    > peak watt.
    >
    >
    > The 140W inverter I mainly use for charging digital camera
    > batteries in my car definitely won't start this freezer, but my
    > 700W(1000W peak) inverter can start it(barely.. it beeps when the freezer
    > starts). Is there anyway I can run a freezer/refrigerator on an inverter
    > short of getting an inverter with a peak wattage that can accomodate 120V
    > * compressor's LRA? It's really foolish having to dedicate a 700W(1000W
    > peak) inverter for a 115W freezer.


    You can buy lots of extra stuff and try to lower the amps or watt
    requirement for starting. I will bet that when you discover the cost of the
    soft start equipment it would have been cheaper buy a 1000w inverter. They
    are not that expensive. Besides it will give you something else to run when
    the freezer is not. I personally would not be to worried about a freezer
    when the temps are low. I had a power outage in Arizona ambient was about
    100 F. I did not open it up until the power came back, 2 days. I kept a min
    max thermometer in it and it never rose high enough to be in danger.
    SQLit, Jan 18, 2004
    #3
  4. AC/DCdude17

    ptaylor Guest

    Chris Hill wrote:

    > On Sun, 18 Jan 2004 09:12:36 GMT, AC/DCdude17
    > <> wrote:
    >
    >
    >> We got our share of snow in my area and many people had an outage
    >>lasting quite a while. I'd like to be able to power a freezer on
    >>inverter powered from car battery for extended outages. My freezer takes
    >>115W, 145VA to sustain operation, but the compressor is rated at
    >>7.5LRA(locked rotor amps, which you can use to estimate your
    >>fridge/freezer's peak power requirement) and I guess that comes to 900
    >>peak watt.
    >>
    >>
    >> The 140W inverter I mainly use for charging digital camera
    >>batteries in my car definitely won't start this freezer, but my
    >>700W(1000W peak) inverter can start it(barely.. it beeps when the freezer
    >>starts). Is there anyway I can run a freezer/refrigerator on an inverter
    >>short of getting an inverter with a peak wattage that can accomodate 120V
    >>* compressor's LRA? It's really foolish having to dedicate a 700W(1000W
    >>peak) inverter for a 115W freezer.
    >>
    >>
    >>Searching the internet showed there's an "easy start kit" that lower's
    >>peak current by starting compressor slowly, but I haven't been able to
    >>find any.

    >
    >
    > You aren't losing much by using the inverter that is properly sized
    > for the job. Remember too that the wiring to the inverter must be
    > properly sized for the job, I suspect that is what your problem really
    > is.>
    >


    Hmm,I'm slightly suspicious of the wire size too,it sounds like it might
    be too small.
    I tried to run my PC from my 300W inverter,and it would start
    booting,then mysteriously turn off after 2-3 seconds.
    After using larger 10AWG wire,and a much shorter run (8-10
    inches,instead of 2-3 feet!) I can now run the PC *and* monitor just
    fine! I strapped the inverter to the side of a 12V 17Ah SLA battery I
    got for $10 surplus,so it's one nice unit,and I could keep the wires
    short.I also made a set of "jumper cables" for it from some heavy wire
    and alligator clips,for recharging,tying into the other
    batteries,jupstarting the car,etc.Kinda like a homebrew version of one
    of those Coleman/Prestone jumpstart power pack things,with a 300W
    inverter to boot.It works great!!
    ptaylor, Jan 18, 2004
    #4
  5. 20 hours on 3.4 gallons!!!Even a tank at full speed doesn't consume so
    much.Better buy nothing, save the money because power outages happen every
    now and then.Do you have a lot of goodies in the freezer?

    --
    Dimitris Tzortzakakis,Greece
    Visit our website-now with air condition!
    http://www.patriko-kreta.com
    Ï "Larry W4CSC" <> Ýãñáøå óôï ìÞíõìá
    news:...
    > By the time you buy enough battery power to sustain the freezer for
    > even just 8 hours and the charger to recharge it and the maintenance
    > of having to replace the dead batteries every 3 years.....you're much
    > better off buying a nice genset that can power lots more stuff and has
    > nearly zero maintenance just sitting there....
    >
    > I recommend tossing caution to the wind and buying the Honda EU3000is
    > super quiet, electric start at around $1800 on the net. It's a honey!
    > http://www.hayesequipment.com/eu3000is.htm
    >
    > It won't even come off economy speed crankin' that freezer.....
    > With a 750W load, it will run 20 hours on 3.4 gallons of gas! Mine
    > does, easy.
    >
    >
    >
    > On Sun, 18 Jan 2004 09:12:36 GMT, AC/DCdude17
    > <> wrote:
    >
    > > We got our share of snow in my area and many people had an outage
    > >lasting quite a while. I'd like to be able to power a freezer on
    > >inverter powered from car battery for extended outages. My freezer takes
    > >115W, 145VA to sustain operation, but the compressor is rated at
    > >7.5LRA(locked rotor amps, which you can use to estimate your
    > >fridge/freezer's peak power requirement) and I guess that comes to 900
    > >peak watt.
    > >
    > >
    > > The 140W inverter I mainly use for charging digital camera
    > >batteries in my car definitely won't start this freezer, but my
    > >700W(1000W peak) inverter can start it(barely.. it beeps when the freezer
    > >starts). Is there anyway I can run a freezer/refrigerator on an inverter
    > >short of getting an inverter with a peak wattage that can accomodate 120V
    > >* compressor's LRA? It's really foolish having to dedicate a 700W(1000W
    > >peak) inverter for a 115W freezer.
    > >
    > >
    > >Searching the internet showed there's an "easy start kit" that lower's
    > >peak current by starting compressor slowly, but I haven't been able to
    > >find any.
    > >
    > >I suppose I could use a series reactor to restrict the starting current
    > >but could the comrpessor start up with restricted starting current?
    > >

    >
    >
    > Larry W4CSC
    Dimitris Tzortzakakis, Jan 19, 2004
    #5
  6. On Mon, 19 Jan 2004 14:45:26 +0200, the renowned "Dimitris
    Tzortzakakis" <> wrote:

    >20 hours on 3.4 gallons!!!Even a tank at full speed doesn't consume so
    >much.


    M1A1 60 gallons per hour cross-country (1200 gallons in 20 hours).
    *Idling* it would use 200 gal. in 20 hours.

    >Better buy nothing, save the money because power outages happen every
    >now and then.Do you have a lot of goodies in the freezer?


    3.4 gal of gas costs just a few dollars, what are you talking about?

    Best regards,
    Spehro Pefhany
    --
    "it's the network..." "The Journey is the reward"
    Info for manufacturers: http://www.trexon.com
    Embedded software/hardware/analog Info for designers: http://www.speff.com
    Spehro Pefhany, Jan 19, 2004
    #6
  7. On Mon, 19 Jan 2004 18:26:58 GMT, the renowned (Larry
    W4CSC) wrote:

    >On Mon, 19 Jan 2004 14:10:52 GMT, Spehro Pefhany
    ><> wrote:
    >
    >>
    >>3.4 gal of gas costs just a few dollars, what are you talking about?
    >>

    >Not in Greece it doesn't....(c;


    Say EUR0.80/l * 3.8 (US gallons) * 3.4 ~= EUR10. I doubt you can get
    a bottle of Ouzo for that. ;-)

    Best regards,
    Spehro Pefhany
    --
    "it's the network..." "The Journey is the reward"
    Info for manufacturers: http://www.trexon.com
    Embedded software/hardware/analog Info for designers: http://www.speff.com
    Spehro Pefhany, Jan 19, 2004
    #7
  8. AC/DCdude17

    AC/DCdude17 Guest

    X-No-Archive: Yes

    Larry W4CSC wrote:

    > By the time you buy enough battery power to sustain the freezer for
    > even just 8 hours and the charger to recharge it and the maintenance
    > of having to replace the dead batteries every 3 years.....


    Who said I need to sustain the freezer on normal cycle? I need to sustain the
    tempreature low enough to prevent spoilage of food inside.

    A freezer can often keep it below freezing for a whole day, but being able to
    run the compressor every 12hrs or so for 30min is going to help quite a bit.
    We seldom have power outages lasting more than a few min. It will not be
    powered from a dedicated battery bank. The inverter will simply get hooked up
    to my car and fridge will run with the engine running.

    This freezer only takes 115W nominal, so input to inverter is about 140W or
    12V 12A.

    If I run it on a fully charged car battery for 30min, it will use up 6Ah from
    the battery and that amount houldn't interfere with the ability to start the
    vehicle.

    Once I do this, I can just do this again after I used the car so the battery
    is brought back to full charge.



    >


    > you're much
    > better off buying a nice genset that can power lots more stuff and has
    > nearly zero maintenance just sitting there....


    This isn't correct about a gasoline powered generator. Ever had trouble
    starting a lawn mower that was stored until the next season by simply putting
    it away normally?

    Gasoline don't keep very well and it's known to gum up the fuel system.

    >
    > I recommend tossing caution to the wind and buying the Honda EU3000is
    > super quiet, electric start at around $1800 on the net. It's a honey!
    > http://www.hayesequipment.com/eu3000is.htm
    >
    > It won't even come off economy speed crankin' that freezer.....
    > With a 750W load, it will run 20 hours on 3.4 gallons of gas! Mine
    > does, easy.


    Oh please. There is no way I'm going to justify spending nearly two grands
    for rare power outages.
    AC/DCdude17, Jan 19, 2004
    #8
  9. AC/DCdude17

    Dick Guest

    AC/DCdude17 wrote:
    > X-No-Archive: Yes
    >
    > Larry W4CSC wrote:
    >
    >
    >>By the time you buy enough battery power to sustain the freezer for
    >>even just 8 hours and the charger to recharge it and the maintenance
    >>of having to replace the dead batteries every 3 years.....

    >
    >
    > Who said I need to sustain the freezer on normal cycle? I need to sustain the
    > tempreature low enough to prevent spoilage of food inside.
    >
    > A freezer can often keep it below freezing for a whole day, but being able to
    > run the compressor every 12hrs or so for 30min is going to help quite a bit.
    > We seldom have power outages lasting more than a few min. It will not be
    > powered from a dedicated battery bank. The inverter will simply get hooked up
    > to my car and fridge will run with the engine running.
    >
    > This freezer only takes 115W nominal, so input to inverter is about 140W or
    > 12V 12A.
    >
    > If I run it on a fully charged car battery for 30min, it will use up 6Ah from
    > the battery and that amount houldn't interfere with the ability to start the
    > vehicle.
    >
    > Once I do this, I can just do this again after I used the car so the battery
    > is brought back to full charge.



    Many RV owners run apartment size refrigerators on inverters. The duty
    cycle of a refrigerator is low enough that they can get by with just a
    few batteries. However, they use deep discharge batteries, often 4
    golf cart types. Deeply discharging car batteries drastically reduces
    their life.


    >
    > Oh please. There is no way I'm going to justify spending nearly two grands
    > for rare power outages.


    You don't need that size for a freezer. Honda makes a nice 1KW unit
    that sells for about $700. It is a DC generator that drives an inverter.

    For your use a Coleman 1.8KW unit for $500 would be adequate.
    Dick, Jan 20, 2004
    #9
  10. AC/DCdude17

    East-of-lake Guest

    Just a thought that I've had before:

    If your power outage is due to SNOW and you're trying to keep things cold
    why don't you put it in a box outside in the snow? Here in the northwest
    we've had a few outages that lasted over a day with temperatures in the
    teens and twenties. I just put the frozen stuff in a box outside.
    Refrigerated stuff had to be cycled into the garage which was cold but not
    freezing.


    "AC/DCdude17" <> wrote in message
    news:...
    > We got our share of snow in my area and many people had an outage
    > lasting quite a while. I'd like to be able to power a freezer on
    > inverter powered from car battery for extended outages. My freezer takes
    > 115W, 145VA to sustain operation, but the compressor is rated at
    > 7.5LRA(locked rotor amps, which you can use to estimate your
    > fridge/freezer's peak power requirement) and I guess that comes to 900
    > peak watt.
    >
    >
    > The 140W inverter I mainly use for charging digital camera
    > batteries in my car definitely won't start this freezer, but my
    > 700W(1000W peak) inverter can start it(barely.. it beeps when the freezer
    > starts). Is there anyway I can run a freezer/refrigerator on an inverter
    > short of getting an inverter with a peak wattage that can accomodate 120V
    > * compressor's LRA? It's really foolish having to dedicate a 700W(1000W
    > peak) inverter for a 115W freezer.
    >
    >
    > Searching the internet showed there's an "easy start kit" that lower's
    > peak current by starting compressor slowly, but I haven't been able to
    > find any.
    >
    > I suppose I could use a series reactor to restrict the starting current
    > but could the comrpessor start up with restricted starting current?
    >
    East-of-lake, Jan 20, 2004
    #10
  11. AC/DCdude17

    Q Guest

    How would Bush's oil company cronies make any money at 50 cents per gal? The
    last thing Bush wants is cheap gasoline.

    Q

    > Ouch! That hurts!
    >
    >
    > Larry W4CSC
    >
    > Is it just me or did the US and UK just capture 1/3
    > of the world's sweetest oil supply? What idiot wants to
    > GIVE IT BACK?!!
    > Let's do what Europeans have been doing for centuries.
    > DIVIDE UP THE SPOILS OF OUR CONQUEST! Gas will be
    > $US0.50/US gallon again, STUPIDS!
    Q, Jan 22, 2004
    #11
  12. "ptaylor" <> wrote in message
    news:5FDOb.56$...
    > Chris Hill wrote:
    >
    > > On Sun, 18 Jan 2004 09:12:36 GMT, AC/DCdude17
    > > <> wrote:
    > >
    > >
    > >> We got our share of snow in my area and many people had an outage
    > >>lasting quite a while. I'd like to be able to power a freezer on
    > >>inverter powered from car battery for extended outages. My freezer

    takes
    > >>115W, 145VA to sustain operation, but the compressor is rated at
    > >>7.5LRA(locked rotor amps, which you can use to estimate your
    > >>fridge/freezer's peak power requirement) and I guess that comes to

    900
    > >>peak watt.


    If you have a bunch of snow, why are you worried about your freezer?
    Just put all your frozen stuff out on the porch.


    Ray
    Ray Drouillard, Feb 13, 2004
    #12
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