math help

Discussion in 'General Camping Discussion Forum' started by p, Feb 17, 2020.

  1. p

    p Active Member

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    The details:
    -20,000 btu propane bbq
    -connected to lp of tent trailer (ie. 20 lb propane tank)

    Question- How many pounds per hour do i use up with the bbq?
    (Yes, I know it will be a decimal)

    Does 0.433 lb make sense ?
     
  2. tombiasi

    tombiasi Well-Known Member

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    It will be what ever the unit uses. We need the specs of gas consumption. They are not all the same.
     
  3. p

    p Active Member

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    It is a coleman roadtrip. I want to have an estimate so that i ensure i will not run out and not have a furnace.
     
  4. tombiasi

    tombiasi Well-Known Member

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    Well, I don't have time to look up the specs for you. If you can provide them I will help.
     
  5. Sjm9911

    Sjm9911 Well-Known Member

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    Yea , kind of agree it depends on what the output is. So if the burners are both on high, or low. Why are you running it for hours anyway? Lol. My home propane tank lasts a while and i use it a lot. If camping i run the 20 lbs out quicker if i use the propane fire pit. Those can use up propance as tou so have them on for hours. A BBQ grill just cooking will probably last way longer then your camping time.
     
  6. Sjm9911

    Sjm9911 Well-Known Member

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    Oh , so your running what? And want to k ow how long a tank can last?
     
  7. generok

    generok Well-Known Member

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    A pound of LP contains 21,500 BTU. If your grill is operating at 20,000 BTU, you are burning just shy of 1 pound of LP per hour of run time. YMMV.
     
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  8. lksdrinker

    lksdrinker Active Member

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    Keep in mind that many "20 lb propane tanks" are only filled to about 15 lbs. Or so I've been told thats the way most places that swap tanks (as opposed to filling right there for you) do it.
     
  9. p

    p Active Member

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    Perfect...thanks for the response. I wanted to make sure I do not run out of propane for the furnace.
     
  10. Sjm9911

    Sjm9911 Well-Known Member

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    The furnace will eat up the propane, especially in cold weather.
     
  11. tombiasi

    tombiasi Well-Known Member

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    If you are on battery, the battery won't last as long as the propane.
     
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  12. RockyRoo

    RockyRoo Just because you CAN doesn't mean you SHOULD

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    My suggestion, if you can, take an extra tank with you. 1 for the trailer and 1 for the grill. Worst case scenerio if the furnace tank runs dry in the middle of the night you can swap the grill tank into service and stay warm
     
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  13. MileHigh

    MileHigh Active Member

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    The propane grill if ran on high would last just over 21 hours if it was really 20 pounds of propane. Tanks are considered full though at 80% which reduces the time to 17 hours.

    A gallon of propane gives 91,500 BTU's and weighs 4.23 pounds.
     
  14. Econ

    Econ Well-Known Member

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    There are may variables to tank fullness. There is the persistent story that exchange tanks only have 15 pounds in them. Our two oldest bottles are on the camper. We only exchange bottles when both are out while on a trip, hasn't happened yet, or the certification is expiring. One local filling station will only fill to 16 pounds. There is written info at the Uhaul filling station that they fill to 19.4 pounds. That's a 36 pound target minus the tare.

    *******************************
    Edit,,,, The above was written before 6:51AM which is before my 9 am brain fully engaged time.<GG> The correct info written on the UHual sheet is the target is 4.5 gallons times 4.2 pounds equals 18.9 total pounds plus tare of 16.6= 35.5 pounds. Since its before 6 am right now I will go back to sleep
     
    Last edited: Feb 23, 2020
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  15. scubacamper

    scubacamper Well-Known Member

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    Here's a different thought on the subject as propane is heavy to carry. If you are boondocking then this won't help but if you have power access, buy a small electric heater, we did for less than $30 at Walmart and it heated the PUP nicely within minutes saving our gas for the stove and other things. Just an alternative.
     
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  16. Melissa Freeman

    Melissa Freeman New Member

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    That's what we did and it worked out great.
     
  17. Anthony Hitchings

    Anthony Hitchings Well-Known Member

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    If you are propane hogs just plan on refilling it part way thru your trip. We did 3 weeks in Yellowstone area and only used part of our tank, then did a thanksgiving trip on the same tank. It was a 15 Lb exchange tank. We did use the heater in the mornings.
     
  18. ST Dog

    ST Dog Member

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    Blue Rhino states it in their FAQ. Starting in 2008 they dropped from 17lbs to 15lbs. (Same price, less propane instead of increasing price)
    https://bluerhino.com/propane-info/faqs/buying-blue-rhino-tanks-faqs
    (Bad enough they were only filling to 17lbs, but now only 3/4 full.)
    Supposedly it's also marked on the package and other signage.

    I never use nor even look to verify.

    I just checked Home Depot online and their exchange tanks (AmeriGas) say 15lbs net weight on the label.
     
    Last edited: Mar 16, 2020
  19. bheff

    bheff Well-Known Member

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    I'm fortunate. On Fridays the local propane place fills the 20 pounds tanks for $5.
     
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  20. ST Dog

    ST Dog Member

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    Wouldn't go back there. Only using 3/4 the capacity.

    Better but still stopping 1lb short of where it should be.

    The tanks are sized to hold 20lb and still have the required headspace for expansion.
     

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