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Old 07-14-2007, 08:56 PM   #1
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Question Thinking about purchasing a diesel generator

Since I drive a 2006 F250 Powerstroke, and I am thinking about an auxiliary tank for the pickup truck bed to carry additional diesel, I have been thinking it would be nice to have a generator that used the same fuel as my truck. I could refuel both the truck and the generator from the aux tank in the bed when necessary. Problem is most PORTABLE diesel generators I have come across have continuous wattage maximums of about 6100 watts. This would provide about 25.4 Amps which sounds good, but it ain't the 30 amps needed to power the Airstream. The next size up diesel generator is either a "tow" job or a "stationary" monster. I could easily just go with the two little Honda EU2000s, but was trying to stick with ONE fuel for both tow vehicle and generator. Thoughts anyone?
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Old 07-14-2007, 09:57 PM   #2
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Hi,
Most SOB motorhomes come with a 5000k Genset. The 6100K would be more than enough to run your Airstream, unless you have 2 AC's you want to run both at once, or all your lights, the microwave oven, fridge, furnace and your AC at the same time.



I'd go with the 6100K


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Old 07-14-2007, 10:15 PM   #3
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Quote:
Originally Posted by Streamer1
Since I drive a 2006 F250 Powerstroke, and I am thinking about an auxiliary tank for the pickup truck bed to carry additional diesel, I have been thinking it would be nice to have a generator that used the same fuel as my truck. I could refuel both the truck and the generator from the aux tank in the bed when necessary. Problem is most PORTABLE diesel generators I have come across have continuous wattage maximums of about 6100 watts. This would provide about 25.4 Amps which sounds good, but it ain't the 30 amps needed to power the Airstream. The next size up diesel generator is either a "tow" job or a "stationary" monster. I could easily just go with the two little Honda EU2000s, but was trying to stick with ONE fuel for both tow vehicle and generator. Thoughts anyone?
My Dometic Penguin 13.5k unit compressor draws 12.4 amps and the fan motor 3.1 amps. I don't know if this is startup or continuous so I would find out what it draws and go from there. My Yamaha EF3000iSEB handles the Penguin just fine but occasionally will kick off the breaker to the Intellipower on initial startup. If I reset it then it does not do it again.
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Old 07-14-2007, 10:22 PM   #4
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25 amps at 120v? Wouldn't that = 3000 watts?
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Old 07-14-2007, 10:31 PM   #5
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What's the noise level on that "portable" diesel generator?
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Old 07-14-2007, 11:18 PM   #6
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The Yamaha EF3000iSEB has rated current of 23.5 amps and max of 25 amps. If the diesel generator puts out at least that then you should be good to go for your A/C and lighting.
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Old 07-15-2007, 06:06 AM   #7
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Originally Posted by cosmotini
25 amps at 120v? Wouldn't that = 3000 watts?
I believe the calculation is: 6100 watts divided by 240 Volts = 25.4 Amps
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Old 07-15-2007, 06:14 AM   #8
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Originally Posted by peegreen
What's the noise level on that "portable" diesel generator?
75 dba at 7 meters. I am not that concerned with noise level cause it would be used on private property, not a campground situation.
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Old 07-15-2007, 06:18 AM   #9
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The Yamaha EF3000iSEB has rated current of 23.5 amps and max of 25 amps. If the diesel generator puts out at least that then you should be good to go for your A/C and lighting.
Sounds good Craig. So, for Airstreams that use a 30 amp circuit, does this mean you can use a power source that provides LESS than 30 amp power (may not be able to power all requirements) but you cannot use a power source that provides MORE than 30 amps?
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Old 07-15-2007, 08:13 AM   #10
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Streamer-----You used 240v in your calc to determine max amps while the other folks are talking 110v since that is what the AS uses as input from shore power. Maybe that's the difference?
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Old 07-15-2007, 08:20 AM   #11
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6100 watts/125 volts =48.8 amps. I think your Airstream can operate on that amperage. We have a 6,000 watt generator that doens't even hiccup when you turn on the air conditioner, microwave, and television at the same time. I suppose we could try turning on a hair dryer, too, but that would probably trip the 30 amp breaker int he coach.
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Old 07-15-2007, 11:32 AM   #12
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Streamer-----You used 240v in your calc to determine max amps while the other folks are talking 110v since that is what the AS uses as input from shore power. Maybe that's the difference?
Hi Bob. I used 240 Volts cause that's what an engineer at Kubota was using in her calculations. So far I've seen or been informed about 240V, 120V, 110V, and now 125V. My head is spinning!
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Old 07-15-2007, 11:36 AM   #13
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Originally Posted by overlander63
6100 watts/125 volts =48.8 amps. I think your Airstream can operate on that amperage. We have a 6,000 watt generator that doens't even hiccup when you turn on the air conditioner, microwave, and television at the same time. I suppose we could try turning on a hair dryer, too, but that would probably trip the 30 amp breaker int he coach.
Sounds like the coach (AS) electrical ckt is the "weak" link, not the generator's ability to pump out amperage?
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Old 07-15-2007, 12:46 PM   #14
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I have been thinking it would be nice to have a generator that used the same fuel as my truck.
The same fuel idea is worth considering but since I assume you will be using the generator while using the trailer I would suggest you consider a propane generator, less expensive per KW, propane engines will last longer than gas, and a wider varity to select from.

If you look at my site Page 3
you can see how I take propane from the trailer to fuel my truck when I want real power. The same idea could be used to fuel a generator.

Honda and Yamaha both make propane generators in the 3000 watt size that will meet the needs. yes the Airstream has a 30amp service but that does not mean it has to be supplied with 30 amps just to work. I assume your hause has at least a 200 amp 3 phase service but I doubt you ever draw 1/3 of that.
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