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10-08-2016, 02:10 PM
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#1
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Trying to Retire
Decatur
, Illinois
Join Date: Jul 2013
Posts: 342
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Prepper / Hurricane Backup
Well I'm sure nowhere near coastal regions but lots of rain and power out in Pinehurst, NC.
Running Cable Modem, Laptop & TV off the Airstream Interstate EXT generator.
Never ran more than an hour or so a day. Anyone know how many hours I can expect on full tank of LP gas?
(This is when I ask why the generator isn't Diesel).
Mike
__________________
Mike
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If you work until you have everything you 'WANT' - it will probably be too late to enjoy it.
Live in the Moment and enjoy today.
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10-08-2016, 02:17 PM
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#2
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3 Rivet Member
2013 Interstate Coach
Bradenton
, Florida
Join Date: Dec 2013
Posts: 194
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Depends on the load.. If you're just running some small electronics, I would guess at least 24 hours if not more of run time..
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10-08-2016, 02:18 PM
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#3
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2 Rivet Member
Join Date: Oct 2015
Posts: 48
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We have gotten 12 hours out of ours (T1N) running the A/C continuously while driving in 115° heat. We like the propane since we often use it for light loads as you described. The light loading on propane isn't subject to "wet stacking" like diesel is. Diesel likes 60% loads or more. Propane, not an issue.
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10-08-2016, 03:33 PM
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#4
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Quote:
Originally Posted by MILATV
Well I'm sure nowhere near coastal regions but lots of rain and power out in Pinehurst, NC.
Running Cable Modem, Laptop & TV off the Airstream Interstate EXT generator.
Never ran more than an hour or so a day. Anyone know how many hours I can expect on full tank of LP gas?
(This is when I ask why the generator isn't Diesel).
Attachment 273151
Mike
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On an NCV3 Interstate that holds 14 gallons of propane in an 18-gallon ASME tank, you can theoretically get up to about 22-24 hours of generator run-time, assuming the generator is the only thing using your propane and the generator is only lightly loaded. If you add the stove and/or the water heater as propane users, that duration will go down accordingly.
__________________
I thought getting old would take longer!
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10-08-2016, 04:16 PM
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#5
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Rivet Master
2011 Interstate Coach
Overland Park
, Kansas
Join Date: Aug 2011
Posts: 2,798
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Airstream told me when I asked that question that the same capacity diesel generator was physically larger and wouldn't fit.
__________________
Glass half full or half empty to an engineer is the glass is twice as big as it needs to be.
2011 Interstate SOLD! Upfitted 2017 Transit 350. SOLD!
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10-11-2016, 11:24 AM
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#6
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1 Rivet Member
2015 Interstate Ext. Coach
Oklahoma City
, Oklahoma
Join Date: Jul 2016
Posts: 16
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Quote:
Originally Posted by 73shark
Airstream told me when I asked that question that the same capacity diesel generator was physically larger and wouldn't fit.
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Funny. They told me it was because Mercedes wouldn't let them tap into the diesel fuel line. I guess other brands don't have to obey Mercedes like Airstream does.
We could get about two to three days running the AC, TV's, charging phones on our last trip. The generator ran for about 5-8 hours each day. So, I am guessing 15-24 hours approximately. I am going to guess the days we ran 8 hours are the days we only got two days out of a fill. That would put it more in the 16 hour range. Give or take from our last big trip.
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2015 Airstream Interstate Ext Lounge
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10-11-2016, 11:45 AM
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#7
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Figment of My Imagination
2012 Interstate Coach
From All Over
, More Than Anywhere Else
Join Date: Dec 2011
Posts: 10,868
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Quote:
Originally Posted by sillyRVmom
Funny. They told me it was because Mercedes wouldn't let them tap into the diesel fuel line. I guess other brands don't have to obey Mercedes like Airstream does.
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They wouldn't tap into the diesel fuel line for a diesel generator anyway. The typical diesel engine + diesel generator setup (usually seen on big Class A motorhomes) is to run a separate fuel pump from the tank to the generator, but drawing from somewhere above the bottom of the tank (about the 1/4-full level or higher) so that when the generator runs out of fuel there's still about a quarter-tank of fuel left in the tank to run the engine, to prevent the generator from leaving you stranded with no fuel at all.
And since a Sprinter only has a 25-gallon diesel tank to begin with, that wouldn't leave you with much run-time on the generator…
__________________
I thought getting old would take longer!
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10-11-2016, 03:38 PM
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#8
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Rivet Master
2011 Interstate Coach
Overland Park
, Kansas
Join Date: Aug 2011
Posts: 2,798
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Could also put a separate diesel fuel tank where the propane tank is now and have a smaller propane tank for the stove/WH.
__________________
Glass half full or half empty to an engineer is the glass is twice as big as it needs to be.
2011 Interstate SOLD! Upfitted 2017 Transit 350. SOLD!
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10-11-2016, 05:51 PM
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#9
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Rivet Master
2024 Interstate 19
Fulton
, Maryland
Join Date: May 2010
Posts: 3,883
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Quote:
Originally Posted by sillyRVmom
Funny. They told me it was because Mercedes wouldn't let them tap into the diesel fuel line. I guess other brands don't have to obey Mercedes like Airstream does. :.......
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That's interesting as the Sprinter has a separate fuel tap on its tank to supply other diesel powered accessories, like heaters. It is designed to not fully drain the tank and leave at least 1/4 tank of fuel.
Also all the Airstream Interstate 12V Main Schematics I've seen show both an LP and diesel generator.
- - Mike
2013 Lounge EXT on 2012 Sprinter
__________________
- - Mike
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2024 Airstream Interstate 19e AWD
Previous: 2013 Airstream Interstate 3500 Ext Lounge
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10-11-2016, 06:28 PM
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#10
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3 Rivet Member
2017 Interstate Lounge Ext
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, VT, AZ, CA
Join Date: Jul 2016
Posts: 106
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When I sketched out a custom build it was my intention to use the PowerTech diesel generator specifically made for the Sprinter: https://cdn.shopify.com/s/files/1/00...34311221573876.
Running at full load, if 3/4 of a full tank of diesel was available, the run time would be over 85 hours. At half load, it would be 188 hours.
Given the disadvantages of diesel, presence of other LPG appliances, cost, etc. I don't think a retrofit makes sense. Having just taken delivery of my 2017 I've explored underneath, and intend to discuss with a specialist the possibility of adding a second ASME propane tank. It must be located within the wheelbase.
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10-12-2016, 07:49 AM
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#11
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Rivet Master
2024 Interstate 19
Fulton
, Maryland
Join Date: May 2010
Posts: 3,883
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Quote:
Originally Posted by don000
When I sketched out a custom build it was my intention to use the PowerTech diesel generator specifically made for the Sprinter: https://cdn.shopify.com/s/files/1/00...34311221573876.
Running at full load, if 3/4 of a full tank of diesel was available, the run time would be over 85 hours. At half load, it would be 188 hours.
Given the disadvantages of diesel, presence of other LPG appliances, cost, etc. I don't think a retrofit makes sense. Having just taken delivery of my 2017 I've explored underneath, and intend to discuss with a specialist the possibility of adding a second ASME propane tank. It must be located within the wheelbase.
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The PowerTech diesel generator is also larger than the Onan LP unit and reduces the rear ground clearance even further.
- - Mike
2013 Lounge EXT on 2012 Sprinter
__________________
- - Mike
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2024 Airstream Interstate 19e AWD
Previous: 2013 Airstream Interstate 3500 Ext Lounge
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10-15-2016, 12:49 PM
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#12
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Rivet Master
2007 Interstate
League City
, Texas
Join Date: Oct 2014
Posts: 6,139
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Quote:
Originally Posted by Boxster1971
That's interesting as the Sprinter has a separate fuel tap on its tank to supply other diesel powered accessories, like heaters. It is designed to not fully drain the tank and leave at least 1/4 tank of fuel.
Also all the Airstream Interstate 12V Main Schematics I've seen show both an LP and diesel generator.
- - Mike
2013 Lounge EXT on 2012 Sprinter
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Model years? NCV3 only, or also T1N? I haven't had time to look into it yet.
Coincidentally, I came across this Instagram post while eating lunch today, which caused me to pound my anguished head on my desk (literally).
Here I am trying to persevere with a miserable 6-gallon propane tank that is supposed to fulfill three functions (fridge, stove, and furnace), and here's THIS guy in his low-end T1N home-made camper who has a freakin' diesel furnace and virtually unlimited heat.
What is wrong with this picture?? Somebody shoot me! Or don't bother because I'll just freeze to death instead!
Anyway, I don't care so much about running a generator on diesel, but I *have* to reduce the load on the existing propane system, by adding a second tank or by shedding one or more functions from the existing system. If I/we could get a standalone diesel furnace that could be retrofitted, that would help significantly. Future research project; lithium comes first.
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10-15-2016, 01:08 PM
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#13
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3 Rivet Member
2017 Interstate Lounge Ext
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, VT, AZ, CA
Join Date: Jul 2016
Posts: 106
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Quote:
Originally Posted by InterBlog
Model years? NCV3 only, or also T1N? I haven't had time to look into it yet.
Coincidentally, I came across this Instagram post while eating lunch today, which caused me to pound my anguished head on my desk (literally).
Here I am trying to persevere with a miserable 6-gallon propane tank that is supposed to fulfill three functions (fridge, stove, and furnace), and here's THIS guy in his low-end T1N home-made camper who has a freakin' diesel furnace and virtually unlimited heat.
What is wrong with this picture?? Somebody shoot me! Or don't bother because I'll just freeze to death instead!
Anyway, I don't care so much about running a generator on diesel, but I *have* to reduce the load on the existing propane system, by adding a second tank or by shedding one or more functions from the existing system. If I/we could get a standalone diesel furnace that could be retrofitted, that would help significantly. Future research project; lithium comes first.
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It would not be difficult to retrofit a small Espar diesel-fueled heater ( https://www.eberspaecher-na.com/prod...r-heaters.html), even if your tank does not have a specific tap.
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