Known Amp Ratings to Calculate Power needs

Discussion in 'Power - Site Power/Batteries/Generators/Solar' started by Agfadoc, Mar 20, 2012.

  1. BigBaron

    BigBaron Dreaming of Tommy's chili cheeseburgers...

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    Jun 21, 2012
    A fridge uses no electricity while running on propane unless you have fans.
     
  2. Phranc

    Phranc New Member

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    Apr 9, 2014
    The control boards in the fridge pull a small amount of power. Less than an amp, probably about .5 amps. Even on propane.
     
  3. BigBaron

    BigBaron Dreaming of Tommy's chili cheeseburgers...

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    Jun 21, 2012
    Not ours. I have never seen a Dometic fridge that needed juice to work on propane. Isn't that the point?
     
  4. swordfish

    swordfish Active Member

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    Sep 27, 2010
    From Dometic:
    [​IMG]

    It draws current even without AES.
    Easy to verify. Run your fridge on propane without battery connection to see if the flame stays lit.
     
  5. Phranc

    Phranc New Member

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    Apr 9, 2014
    Thank you, Swordfish. I searched and searched and couldn't find that.
     
  6. speckhunter80

    speckhunter80 Active Member

    Some of the newer campers do have refrigerators that have a control board that uses a miniscule amount of electricity even when on propane to ensure the propane stays lit among other reasons
     
  7. BigBaron

    BigBaron Dreaming of Tommy's chili cheeseburgers...

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    Jun 21, 2012
    I didn't know mine had a reignitor!
    What'll they think of next? Putting a man on the moon? LOL
     
  8. ChocoChock01

    ChocoChock01 On the road aagaain See Rallies below;

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    You have to stay in the market to out about these innovations[emoji15]
     
  9. rajphoto

    rajphoto New Member

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    Jun 5, 2014
    I'm almost positive after reading the fridge manual etc. that mine is not one that needs power. No automatic re-ignition, though it does shut off gas is flame goes out. I'll have to try running without the battery tonight. I don't have that notice taped to mine.
     
  10. WeRJuliIan

    WeRJuliIan If it's "Aluminum", why not "Sodum" and "Uranum"?

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    Sarasota, FL
    Just a note of caution (I know, everyone yells at me when I do this..)

    The calculations, and the excellent little diagram, reference further up this thread, only work for DC applications. (in this context, the 12v system)

    Don't rely on tham for any AC (110v) wiring or appliances, that's a whole other can of worms :)
     
    Strikeouthhh likes this.
  11. davido

    davido Member

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    I noticed that the ratings for the Suburban furnace, may be off.

    I have the 19000BTU Suburban furnace, model NT20ST consumes 2.8A of current to run the blower(s). The post higher up in this thread suggests over 4A, which may be correct for some other furnace, but not for this one.

    http://www.adventurerv.net/suburban-nt20se-nt20se-series-direct-discharge-furnace-19000-btu-p-3838.html


    When I'm figuring the draw just in my head on a cold night I start with 3A/hr, multiply by number of hours running (all night), and divide by two (runs about half the time). So if we run it half the time for ten hours we're drawing 15AH from our batteries. In practice we run less than half the time, and 2.8A rather than 3A... but then I never end up coming up short on battery power.

    We just returned from two nights out. So with those calculations we figure we consumed about 30AH. With dual group-24's I have 170AH (85 usable). So the furnace drew a little less than half of usable capacity assuming we never dip below 50% discharge. Other consumers are pretty insignificant in comparison; LED lights, infrequent use of the water pump, etc.
     
  12. PoppedPaul

    PoppedPaul What's this button do?

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    Jul 25, 2014
    Aliner Classic Electric Load (measured at the AC outlet)

    CD player - 8 W
    Refrigerator fan - 9 W
    Interior LED lights - 10 W each
    Water heater - 12 W
    Porch lights - 16.5 W
    Battery Charger - 18 W (when active)
    Fan #1 - 22 W
    Fan #2 - 32 W
    Fan #3 - 50 W
    Furnace Fan - 60W
    Water pump - 134 W
    Refrigerator - 180 W
    Air Conditioner - 1150-1550 W AC Only with 2200 W starting surge
    Microwave - 1205 W AC Only


    Battery: ~75aHr
    60W = 17 hours
    180W = 5.2 hours
    300W = 2.6 hours
     
  13. woodworkerfella

    woodworkerfella Member

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    Feb 15, 2015
    Fayetteville, NC
    Saving this for when I begin working on my solar setup.
     
  14. open68

    open68 New Member

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    This is such an interesting thread and full of information that I am not sure were I even want to start my upgrades at.
     
  15. distracto

    distracto Member

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    Jun 23, 2015
    Here is the amps chart for the maxxair k series fans
    Code:
    Speed 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% OFF amps 0.20 0.29 0.43 0.62 0.88 1.19 1.57 2.02 2.56 3.66 0.01
    
    I'll reformat it later, but you get the point...
     
  16. ChocoChock01

    ChocoChock01 On the road aagaain See Rallies below;

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    Mar 7, 2012
    NICE[emoji1] COMPILATION

    Sent from my SAMSUNG-SM-N920A using Tapatalk
     
  17. Strikeouthhh

    Strikeouthhh Member

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    Jun 11, 2015
    St. Paul
    Here's a little spreadsheet I put together - I Bogarted the idea from someone else (sorry, can't remember who) then added the solar calculator.

    https://www.dropbox.com/s/vexstia94tacznp/PU%20Audit.xlsx?dl=0


    PU - 1991 Viking SP175
    TV - 2010 VW TDi Sportswagon STICK
    "I drank What!?!" - Socrates.
     
  18. distracto

    distracto Member

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    Jun 23, 2015
    Here is the table formatted version.

    Amp draw at the 10 speeds for the MaxxAir 10 speed K series fan.

    Gotta say I absolutely love this fan. Much quieter than I had anticipated and moves a heck of a lot of air in my PUP!

    Code:
    SPEED    AMPS
    10%    0.20
    20%    0.29
    30%    0.43
    40%    0.62
    50%    0.88
    60%    1.19
    70%    1.57
    80%    2.02
    90%    2.56
    100%    3.66
    OFF    0.01
    
     
    Last edited: Apr 20, 2017

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