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Old 08-08-2012, 11:17 PM   #1
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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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Old 08-08-2012, 11:25 PM   #2
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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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Old 08-08-2012, 11:28 PM   #3
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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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Old 08-08-2012, 11:29 PM   #4
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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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Old 08-08-2012, 11:45 PM   #5
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73. My final answer.... Is there a prize?
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Old 08-09-2012, 11:29 AM   #6
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I ll tell you who won in September!
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Old 08-09-2012, 11:38 AM   #7
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66.8 hours. I'll take my prize in the form of liquid refreshment.
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Old 08-09-2012, 11:44 AM   #8
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did someone say liquid refreshment? I'm in!
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Old 08-09-2012, 11:49 AM   #9
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Quote:
Originally Posted by JimM68 View Post
did someone say liquid refreshment? I'm in!
But you have to guess to enter, Jim.

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Old 08-09-2012, 12:05 PM   #10
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I guess Tequila!
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Old 08-09-2012, 01:52 PM   #11
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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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Old 08-09-2012, 03:33 PM   #12
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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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