Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 05-21-2016, 01:50 PM   #1
Member
 
Minnesota51's Avatar
 
Join Date: Mar 2015
Posts: 96
How much propane left?

My 18 gal propane tank meter says 1/4 left. My display panel says 1/3.

Full is 14 gals, I believe.

How much do I really have? Can I last a couple of night furnace on for 10 mins about 10 times each night.
__________________

__________________
Minnesota51 is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 05-21-2016, 02:12 PM   #2
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,264
I'd suggest looking for a gauge like this:
Accu-Level Removable Propane Tank Gauge

Often available at Walmart, Home Depot, etc. Magnet attaches it to the tank, pour hot water on it and the level of the liquid will be revealed. That way you'll have an idea how much propane is left when the mechanical and electronic gauges don't agree.
__________________

__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 05-21-2016, 02:42 PM   #3
Senior Member
 
Ron_H's Avatar
 
Newmar Owners Club
Join Date: Apr 2014
Location: White Rock, BC
Posts: 753
I would think the gauge on the tank would be the more accurate, but even that would likely not be highly accurate.

Too many variables to guess of how long that will last you.
__________________
Retired and livin' the RV dream!
2005 Newmar 43 ft. MADP, Cummins ISL 400HP, 2008 Honda CR-V toad
Ron_H is offline   Reply With Quote
Old 05-21-2016, 02:57 PM   #4
Senior Member
 
Join Date: Jul 2014
Posts: 9,917
Quote:
Originally Posted by BFlinn181 View Post
I'd suggest looking for a gauge like this:
Accu-Level Removable Propane Tank Gauge

Often available at Walmart, Home Depot, etc. Magnet attaches it to the tank, pour hot water on it and the level of the liquid will be revealed. That way you'll have an idea how much propane is left when the mechanical and electronic gauges don't agree.
That may be good for a vertical tank but horizontal tanks hold progressively less as you go below the halfway point.

Which gets me wondering, is the float gauge calibrated for that.
__________________
twinboat is online now   Reply With Quote
Old 05-21-2016, 03:04 PM   #5
Senior Member
 
Join Date: Feb 2011
Location: Snowbird - Waterford Mi and Citrus Springs Fl.
Posts: 3,609
If you have no plan B in case you do run out, I'd assume you're going to if your luck runs anything like mine. I say fill it....
__________________
1997 37' HR Endeavor, 275hp Cat, Freightliner
03 CR-V Blue Ox, Ready Brake
ahicks is offline   Reply With Quote
Old 05-21-2016, 03:10 PM   #6
Senior Member
 
HR2004's Avatar
 
Join Date: May 2014
Posts: 450
You might go ahead and fill it and make a note of how much it took.. Then you will know the next time it gets to the 1/4 mark how much you have left.. Do you have a small electic space heater you can safely use if you run out?
__________________
2004 Holiday Rambler DST
Jefferson City, Missouri
Navy vet 67/71 Tonkin Gulf Yacht Club
HR2004 is offline   Reply With Quote
Old 05-21-2016, 03:42 PM   #7
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,264
Quote:
Originally Posted by twinboat View Post
That may be good for a vertical tank but horizontal tanks hold progressively less as you go below the halfway point.

Which gets me wondering, is the float gauge calibrated for that.
The gauge I suggested was not to get a reading of # of gallons or pounds left, but it will give an accurate reading of the level of liquid in the tank. When full, the tank is only 80% liquid. If it were me and it was cold enough to need the furnace and I had a 1/4 level reading, I'd go ahead and fill it to be sure, thus knowing what a 1/4 reading represented in real gallons/pounds.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 05-21-2016, 08:23 PM   #8
Member
 
Minnesota51's Avatar
 
Join Date: Mar 2015
Posts: 96
Quote:
Originally Posted by HR2004 View Post
You might go ahead and fill it and make a note of how much it took.. Then you will know the next time it gets to the 1/4 mark how much you have left.. Do you have a small electic space heater you can safely use if you run out?
No but we were able to get some propane today at a KOA. Unfortunately their pump was not working right, so they could only give us 3 gallons so we still don't know exactly what that quarter mark means.
__________________
Minnesota51 is offline   Reply With Quote
Old 05-21-2016, 09:18 PM   #9
Member
 
Minnesota51's Avatar
 
Join Date: Mar 2015
Posts: 96
I found out that our 30000 BTU Suburban furnace use uses 42 ounces of propane every hour. A third of a gallon.

So I calculated that on these cold nights we've been burning about a half a gallon all night so we could have gone six evenings on what we had in there. Probably less though because cooking on the stove and the refrigerator using some when on house battery power
__________________
Minnesota51 is offline   Reply With Quote
Old 05-22-2016, 08:47 AM   #10
Moderator Emeritus
 
Gary RVRoamer's Avatar


 
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 18,104
Everybody is right about the accuracy, but you should be fine. Taking the most conservative figure, 25% of 14 gallons is still 3.67 gallons, about the usable amount in a 20 lb portable bottle (BBQ tank). That will run the furnace the amount you estimated. But what about water heater? Fridge on propane? That might add to the consumption.

Your LP system runs off vapor, not liquid, and the vapor pressure in the tank drops as the liquid level decreases and the rate of vapor flow goes down. On a very cold night, it drops further. If the tank gets really low, e.g. under 10%, that might cause some intermittent problems with the furnace. It gulps fuel, so needs a strong volume of flow as well as adequate pressure. An insulating blanket around the LP tank helps. Or maybe a light bulb adjacent to it to warm the tank walls a bit.
__________________
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
Gary RVRoamer is online now   Reply With Quote
Old 05-22-2016, 09:46 AM   #11
Senior Member
 
MN_Traveler's Avatar
 
Join Date: Apr 2012
Location: Minneapolis, MN
Posts: 375
Quote:
Originally Posted by Gary RVRoamer View Post
Your LP system runs off vapor, not liquid, and the vapor pressure in the tank drops as the liquid level decreases and the rate of vapor flow goes down. On a very cold night, it drops further. If the tank gets really low, e.g. under 10%, that might cause some intermittent problems with the furnace. It gulps fuel, so needs a strong volume of flow as well as adequate pressure. An insulating blanket around the LP tank helps. Or maybe a light bulb adjacent to it to warm the tank walls a bit.
Sorry to correct - but the vapor pressure is only dependent on the temperature not the amount of liquid in the tank (with the caveat that for relatively fast flows the remaining liquid in the tank supplies the energy to vaporize the molecules leaving as vapor: less liquid = cools off more and vapor pressure goes down). The energy to warm the liquid back up has to come from outside the tank, so a blanket would not help (it would just keep the tank colder). A light bulb to warm the tank would help . But would one really want to put a light bulb right next to a potential flammable gas source???
__________________
- 2012 Fleetwood Expedition 36M -
MN_Traveler is offline   Reply With Quote
Old 05-22-2016, 09:47 AM   #12
Senior Member
 
Ford Super Duty Owner
Join Date: Dec 2009
Location: Mcdonough, Ga.
Posts: 4,384
When we sold a motorhome at our dealership, It always was delivered with a full tank of LP gas. I have probably filled a thousand tanks or more. I can say for sure that inside gauges are all over the place. The gauge in the tank is mechanical. Actually it is mechanical float with a magnetic gauge on the outside of the tank. It is by far the most reliable. (I did say most, not totally) Of course the motorhome must be level.
__________________
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
32 years mechanic at Delta Air Lines 15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.
ga traveler is online now   Reply With Quote
Old 05-22-2016, 09:48 AM   #13
Senior Member
 
BFlinn181's Avatar
 
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 16,264
Quote:
Originally Posted by Gary RVRoamer View Post
Everybody is right about the accuracy, but you should be fine. Taking the most conservative figure, 25% of 14 gallons is still 3.67 gallons, about the usable amount in a 20 lb portable bottle (BBQ tank). That will run the furnace the amount you estimated. But what about water heater? Fridge on propane? That might add to the consumption.

Your LP system runs off vapor, not liquid, and the vapor pressure in the tank drops as the liquid level decreases and the rate of vapor flow goes down. On a very cold night, it drops further. If the tank gets really low, e.g. under 10%, that might cause some intermittent problems with the furnace. It gulps fuel, so needs a strong volume of flow as well as adequate pressure. An insulating blanket around the LP tank helps. Or maybe a light bulb adjacent to it to warm the tank walls a bit.
If you have shore power for a light to warm the tank, why not reduce LP gas use by plugging in a ceramic heater? I'd have no problem with a lightbulb next to the tank, it's not an open flame. Finding LP gas isn't hard, there are even apps to help locate them, and why drop to 1/4 a tank or less? I choose not to tempt fate by running down a tank in cold weather, perhaps causing pressure issues.
__________________

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
BFlinn181 is online now   Reply With Quote
Old 05-23-2016, 01:25 PM   #14
Senior Member
 
Rbhein's Avatar
 
Join Date: Feb 2012
Posts: 218
Can I last a couple of night furnace on for 10 mins about 10 times each night.

Yes.
__________________

__________________
Rbhein is offline   Reply With Quote
Reply

Tags
propane



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
How much rust on your propane tank is too much? Bloodyhell Class A Motorhome Discussions 12 04-25-2016 03:34 PM
Laser printed page, left on dash left permanent reverse words on the vinyl. WH347 Class A Motorhome Discussions 28 07-03-2013 01:36 PM
Non Left Behind - No Runner Left Behind Wayne M Military / Veteran RVing 0 10-13-2012 09:05 AM
Pictures from My Pictures to Forum wagonmaster2 Winnebago Industries Owner's Forum 8 02-12-2009 05:43 AM
How much play is too much? Mbl Cndo Monaco Owner's Forum 8 11-28-2007 01:47 PM

» Virginia Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:48 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.