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Ohmman's Airstream Adventures

Discussion in 'Model X' started by ohmman, Dec 29, 2016.

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  1. ecarfan

    ecarfan Well-Known Member

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    Yes, using the trailer outdoor shower hose is a good way to reduce the amount of waste water going into the trailer grey water tank. My wife and I prefer taking outdoor showers — including at our house where we had one added as part of a remodel — but in a campground there are of course privacy issues. We solved that with one of these
    https://www.amazon.com/gp/product/B01AT3SZ36/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

    However, as @ohmman notes, there are other reasons not to take outdoor showers in campgrounds: scented bath products such as shampoo and soap may attract bears.

    Thanks for the very informative trailer towing trip report!
     
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  2. idoco

    idoco Member

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    Umm...that's 240 lbs full. Do you have a pump?

    Agreed. We have 21 gallons. I have no qualms with outdoor shower.

    One of these days I'm going to plug in the trailer to the car overnight at home to get some more numbers on vampire drain with and without the trailer. It would be nice to use the car as a power source for the trailer if the range hit isn't too much. Save having to deal with lithium upgrades, solar, etc.
     
  3. ohmman

    ohmman Maximum Plaid Member

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    The problem is really that the wiring is vastly undersized for a reasonable charge from the X. To do it right, you have to run thick copper from the inverter to the 12V on the camper. I’ve explored this idea and have vacillated on following through on it. Mostly, my hang up is the idea of accidentally draining the fuel supply of my tow vehicle, especially when out of cell range.

    Another important camping note for some: a Taylor GS mini fits perfectly on top of my charging implements in the frunk.

    00BD8B38-D710-47BD-BEF0-53481650780B.jpeg
     
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  4. cpa

    cpa Active Member

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    Practicing those songs around the campfire, Ohmman?

    "There was a Tesla owner who towed a trailer, and Ohmman was his name-O/
    O-H-M-M-A-N, O-H-M-M-A-N, O-H-M-M-A-N, and Ohmman was his name-O."

    Maybe mix in a little Woody Guthrie and Phil Ochs?
     
    • Funny x 6
  5. Rossy

    Rossy Supporting Member

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    1C64BB16-DF4D-443D-A75A-9815CE9B6CEF.png We are looking to upgrade to an Airstream so it’s grest to see these posts! 24k miles on our X so far but so far most towing trips under 150 mile segments.
     
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  6. Rossy

    Rossy Supporting Member

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    View attachment 317284 We are looking to upgrade to an Airstream so it’s grest to see these posts! 24k miles on our X so far but so far most towing trips under 150 mile segments.
     
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  7. mengwong

    mengwong Member

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    #307 mengwong, Jul 19, 2018
    Last edited: Jul 19, 2018
    Data point: After running the fridge for ~48h my 12V house battery was down to 4.5V. I connected the 7 way cable overnight and by morning the battery was back up to 12V. The Tesla was not connected to shore power.
     
  8. mengwong

    mengwong Member

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    Recharging the trailer 12V did take the Tesla battery down a few kWh – TeslaFi shows it lost about 9kWh over a 20h period. I wish I had better measurements but from first principles even a 100Ah 12V shouldn't cost more than 4 to 8 kWh to recharge.
     
  9. idoco

    idoco Member

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    If you took your 12V house battery down to 4.5V you've either killed it or significantly damaged it. The only time I've ever seen a voltage that low is on permanently damaged batteries with one or more cells irreversibly damaged.

    The 12v you are sering now is probably from charger. I bet as soon as you stop charging and put any load on the voltage will plummet.
     
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  10. mengwong

    mengwong Member

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    So I just boondocked for a couple of weeks at Skyline Park's horse camping section, which has water but no power. I plugged the trailer in to the Model X using the 7 way adapter several hours a day. User load was about 70W worth of monitor and laptop, plus house LED lights off the USB ports. The Tesla maintained the house battery between about 11.5 and 13 volts. Running the fridge on DC dropped the voltage by about 0.5V, so I switched that over to propane. Power loss was negligible, maybe 2–3kW a day, which includes the baseline native loss due to the car.
     
  11. mengwong

    mengwong Member

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    Has anyone done the SF to LA run while towing? I'm looking at the coastal route on the way down and inland back. Looks like I'll want to overnight at an RV park somewhere south of Big Sur; anyone have any recommendations for overnighting?
     
  12. WSKCONDOR

    WSKCONDOR Member

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    Paso Robles is nice. It may be further South than you want to go that day or whatever, but it has a large RV park with well maintained connections (can plug in trailer into 30A and Tesla into 50A simultaneously). There are several wineries and tasting rooms to visit right in the area, and that park also had a shuttle van that would take you to "downtown" paso robles during the state fair-not sure if they run it all the time. I stayed there overnight towing an Airstream with my Model X, and it worked well, all charged up and ready to go the next morning.
    Paso Robles RV Living in California - Wine Country RV Resort
     
  13. WSKCONDOR

    WSKCONDOR Member

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    Does anyone know the fuse size/max current for the 12V trailer lead OUT of the Tesla? Secondarily, I seem to find several different characterizations of how the Tesla will charge (and maybe there are several schemes as the Vin numbers have progressed - I have a June 2018 Model X) - i.e.
    a) X only charges trailer when X is "ON"
    b) X charges trailer whenever trailer is connected to 12V port, and X replenishes it's internal 12V battery as needed
    c) ??

    I ask these questions because I too recently camped with my Airstream, no hookups (and by sad chance my solar panel failed). My trailer batteries are pretty strong, but after two days and nights and using the inverter ALL night each night, the voltage started to drop a little, and got below 12V. I then plugged in the car, actually to take the trailer and run through a dump station-and the car had recharged the trailer batteries to some extent (not all the way, but significantly). Probably only a total of 60-90 minutes of towing, but of course this whole time the model X was "ON".

    Any further data about electrical behavior would be appreciated. Maybe we can compile it.
     
  14. LL-RAN

    LL-RAN New Member

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    You are an absolute GENIUS!!! I have been "stalking" the Airstream forum looking for the past year for just this solution!! My husband found this and we were both delighted!! We aren't "handy" but we did it thanks to all of the details you provided. Although our "extension" isn't as pretty as yours, it works & is very functional. We went camping & it worked like a charm - kids were thrilled. I posted in the Airstream Forum and gave you credit. Thanks again!!
     

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  15. LL-RAN

    LL-RAN New Member

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    You are a GENIUS!!! I have been "trolling" the Airstream Forum looking for just this info when my husband stumbled upon your post. Neither of us are "handy" but because you provided such detailed & specific directions, we were able to pull this off. Ours doesn't look as "pretty" as yours, but the extension is functional and a major improvement. We went camping and the kids LOVED it!! I posted some instructions on the Airstream Forum and gave you credit. Thanks again!!! extension with current cushions.jpg
     
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  16. mengwong

    mengwong Member

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    Btw your back might thank you if you move the triple-pane cushion assembly from the middle to the end where your feet are.
     
  17. mengwong

    mengwong Member

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    #317 mengwong, Sep 27, 2018
    Last edited: Sep 27, 2018
    I’m guessing B on mine – 2016 MX 75D.

    Proposed experimental design:

    With one or two voltmeters handy, one could measure the 12VDC at the trailer and at the car’s center console and trunk outlet.

    It would be particularly interesting to see what the house voltage is after the car cuts power to its 12V ports (after about a half hour in Park); when the car goes to 0, read the gauge panel for voltage, unplug the 7 way port and read it again, then plug it back in and read it again. For extra credit, directly probe the 7 way port itself to see if it’s hot when the car’s sleeping.

    Speaking of sleeping another variable is the “Displays / Power Management / Energy Saving & Always Connected” settings. That might cut power to the 12V system though I suspect it just issues a shutdown command to the computers while the actual 12V lines in the car stay powered.
     
  18. ohmman

    ohmman Maximum Plaid Member

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    I started a thread about this topic a while ago, with some observations. Probably worth discussing it there.

    Charging Travel Trailer Battery from Tesla
     
  19. KirkNason

    KirkNason Member

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    least the marked distance with a custom hitch, and potentially a bit more. I'm not sure how much impact that would have on the aerodynamic front, but dropping Cd by a few hundredths is no small matter when it comes to consumption. More to come on this.

    [/QUOTE]

    I have looked at the Sport 22 and the Flying Cloud 19. You can see quite a few differences, as you said entry-level vs. mid-level AS. Price is quite a jump, but at the same time margin is higher. So you can negotiate more on a FC vs Sport.
     
  20. ohmman

    ohmman Maximum Plaid Member

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    The FC would exceed the tongue weight limitation of the Model X. 550 lbs dry means more like 650-700 loaded. I would only try this with the draw-tite hitch modification.
     

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