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Old 02-11-2014, 09:25 AM   #1
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"Usable" propane capacity?

Until yesterday I wasn't sure about the actual "usable" capacity of the propane tank on the MH. The specs say it is a 43 gallon tank, but I didn't know it that was "usable" capacity, which is 80% of the actual tank size.

I was showing "empty" on the gauge and took it over for a fill-up. It actually held 43.2 gallons, so I now know that's my "usable" capacity!
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Old 02-11-2014, 09:47 AM   #2
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Usable volume actually changes with ambient air temperature. In warmer weather the liquid propane vaporizer to gas much easier producing more. In cold weather you may not be able to vaporize the total liquid volume. Also, liquid gauges and % by volume gauges are more accurate then pressure gauges for the same reason.
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Old 02-11-2014, 10:03 AM   #3
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OK...you made me look. I checked out the brochure for your coach and it says you have a 55 gal LP capacity. At 80% that translates to 47 gallons total LP if filled to 80%.

http://www.monacocoach.com/StaticFil.../02Windsor.pdf

For grins and giggles I looked at the 2001 Windsor brochure and it says it has a 45 gallon tank but it doesn't seem as clear to me if that is total capacity or 80% capacity. If that was total then it would only hold about 36 gallons of LP and that doesn't make any sense from your experience.

BTW...which gauge said you were almost empty? Was it the one on the tank or do you have a LP gauge in the coach?
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Old 02-11-2014, 10:10 AM   #4
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Quote:
Originally Posted by MSHappyCampers View Post
Until yesterday I wasn't sure about the actual "usable" capacity of the propane tank on the MH. The specs say it is a 43 gallon tank, but I didn't know it that was "usable" capacity, which is 80% of the actual tank size.

I was showing "empty" on the gauge and took it over for a fill-up. It actually held 43.2 gallons, so I now know that's my "usable" capacity!
The LP tank on my coach is a 35 gal tank, but takes only 28 gal to fill it when it's empty.
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Old 02-11-2014, 10:46 AM   #5
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Quote:
Originally Posted by Sky_Boss View Post
OK...you made me look. I checked out the brochure for your coach and it says you have a 55 gal LP capacity. At 80% that translates to 47 gallons total LP if filled to 80%.

http://www.monacocoach.com/StaticFil.../02Windsor.pdf

For grins and giggles I looked at the 2001 Windsor brochure and it says it has a 45 gallon tank but it doesn't seem as clear to me if that is total capacity or 80% capacity. If that was total then it would only hold about 36 gallons of LP and that doesn't make any sense from your experience.

BTW...which gauge said you were almost empty? Was it the one on the tank or do you have a LP gauge in the coach?
Don, I went back to see where I got the 43 gallon figure. In the sales brochure it does say 55 gallon, but in the owners' manual it says 43 gallon for the 40' models, although it doesn't specifically mention the 40PBT!


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I was looking at the inside indicator where you see all the tanks. The guy that filled it said the outside gauge was showing about empty too.
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Old 02-11-2014, 11:18 AM   #6
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Mystery solved! I re-read the sales brochure that gave the capacity as 55 gallons and there is a foot note that says the usable capacity is 80% of the capacity stated in the chart. 80% of 55 gallons would be 44 gallons, which is within 1 gallon of the capacity stated in the owner's manual.
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Old 02-11-2014, 12:55 PM   #7
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Quote:
Originally Posted by MSHappyCampers View Post
Mystery solved! I re-read the sales brochure that gave the capacity as 55 gallons and there is a foot note that says the usable capacity is 80% of the capacity stated in the chart. 80% of 55 gallons would be 44 gallons, which is within 1 gallon of the capacity stated in the owner's manual.
Yep...44 is what I should have said earlier...fat fingers.
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Old 02-11-2014, 02:54 PM   #8
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Not sure if it is true or not but I've heard that the new style OPD valves on bottles limit them from being filled to capacity versus the old style where you filled them until the bleeder valve spewed.
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Old 02-12-2014, 01:10 PM   #9
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Yes, all this is to keep an air pocket on top of the propane so that when the propane gas expands on a hot day, it doesn't pop the safety valve or over-pressure the tank. If they allowed you to completely fill the tank, it would have no where to expand to and create a dangerous situation.
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