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08-08-2012, 10:17 PM
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#1
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Junior Member
Join Date: Aug 2012
Posts: 22
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math problem
here is a little math problem that needs gesstimation:
Running an onan 4V gen set at half load for AC on a 69 gallons tank ( safety shutoff at unknown low level) how many hours do I get?
81 winnebago brave with original equipment
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08-08-2012, 10:25 PM
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#2
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,076
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I would say you'll use between 3/4 - 1 gallon an hour. With 69 gallons, between 69 - 92 hours.
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Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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08-08-2012, 10:28 PM
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#3
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Senior Member
Newmar Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: CA
Posts: 2,201
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A quick look at the Onan website says you should use only about .5 gph at half load. If it shuts off at a quarter tank, then you should get about 100 hours....
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08-08-2012, 10:29 PM
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#4
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Jul 2006
Location: Michigan
Posts: 900
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Aren't most tanks plumbed to safety at about 1/4 tank level?
Wouldn't it more likely be about 69 gals * .75 = 51 gals, so then about 51-68 hours if .75 to 1 gal/hr, or about 100 if using the .5 gph figure?
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Ed & Joie
2004 Vectra 40KD
Freightliner Chassis and Cummins ISC
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08-08-2012, 10:45 PM
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#5
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Senior Member
Solo Rvers Club
Join Date: Oct 2007
Location: Zigzag, OR
Posts: 1,063
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73. My final answer....  Is there a prize?
__________________
'07 Itasca 35L/W22 FULL-TIMING
1000 Trails - VFW - 5 Yrs Army
"NOT ALL WHO WANDER ARE LOST" 
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08-09-2012, 10:29 AM
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#6
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Junior Member
Join Date: Aug 2012
Posts: 22
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I ll tell you who won in September!
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08-09-2012, 10:38 AM
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#7
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 5,140
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66.8 hours. I'll take my prize in the form of liquid refreshment.
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08-09-2012, 10:44 AM
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#8
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Registered User
Monaco Owners Club
Join Date: May 2009
Posts: 3,198
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did someone say liquid refreshment? I'm in!
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08-09-2012, 10:49 AM
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#9
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Senior Member
Join Date: Nov 2011
Location: Full time RV'er
Posts: 5,140
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Quote:
Originally Posted by JimM68
did someone say liquid refreshment? I'm in!
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But you have to guess to enter, Jim.
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08-09-2012, 11:05 AM
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#10
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Senior Member
Fleetwood Owners Club
Join Date: May 2012
Location: Silver Springs, Nevada
Posts: 109
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I guess Tequila!
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08-09-2012, 12:52 PM
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#11
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Senior Member
Join Date: Jul 2007
Posts: 1,173
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I was going to guess 100 hours but you didn't say if you were going to be staying at the gas station. I assume you have to drive to your campsite and it would help us guess if we new how much fuel you would have once you got set up. Not knowing your mpg or the distance from the gas station to the campground, I guess 85 hours,
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Pete - Full Timing
2000 Country Coach Magna 40' Indulgence, CAT C10, #5892
2019 Ford Ranger XLT
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08-09-2012, 02:33 PM
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#12
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Junior Member
Join Date: Aug 2012
Posts: 22
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running a 454 chevy with about 20 miles to go, me think 10 mpg plus gen set on, so about 2 to 3 gallons less. But there could be some idle time up to an hour, I am counting 4.
On another note I think it would cost about $20/h to run this rig at 50 mph.
Any 81-ish Brave users to corroborate?
Thx already every one already for playing this guessing game.
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