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Building a home in the wilderness with this vehicle.

Discussion in 'Cybertruck' started by lafrisbee, Jan 2, 2020.

  1. outdoors

    outdoors Always roaming

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    This is the thing that has kept me from wanting to go off grid complete minus fossil fuel sources. I could never feel that the battery system was really up to what the solar was able to handle. Maybe if the truck could couple with a couple powerwalls, or have the ability to supplement in extreme use. Yet need off grid really. Plus wind?

    I see the new designs for these Cyber truck houses all over instagram. Seriously doubt a truck could reverse power those places for very long. Ancillary power sources must be present.
     
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  2. coleAK

    coleAK Member

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    That’s not how electricity works. Solar panels are regulated to around 15v DC and a Tesla battery is 400v DC So even if you could DC to DC couple a 15kw (~51 295w panels) solar system (like you mentioned) to the truck will not charge a 150kw battery in 10 hours under optimal conditions. In simple terms and So as it stands you have to use the 15v DC solar to charge a DC 12v battery bank then convert with an inverter to AC to charger the Tesla through the on board charger that charges the DC batteries. Even in the theoretical future when we can charge DC to DC it would require massive transformers (and batteries) to couple the solar (15v) to the 400v battery.

    There is a lot of good info out there about DC micro grids and building DC wired houses to take out all the inverters.
     
  3. larryboy

    larryboy Member

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    Do a search for Quasar. They seem to have it figured out now so I guess this is the theoretical future.
     
  4. SeminoleFSU

    SeminoleFSU Voluntaryist

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    You need to look at the SolArk 12k the game has changed!
     
  5. coleAK

    coleAK Member

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    Yes, Very similar to the inverter I have on my house:
    Hybrid Inverter System - Conext XW+ 120/240V | SE Solar

    And like I’ve been saying to build a complete system around the inverter you mentioned or mine, that Off grid will reliably charge a Tesla your looking at $50k+
     
  6. JBee

    JBee Member

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    @coleAK
    Most household PV panels have open circuit voltages of over 32V, not 15V, and most decent solar inverters can handle up to 1000V DC as a input from PV panels in series. You most definitely don't need to go down to 12V DC first from solar and then back up to AC. There are also heaps of transformerless solar inverters (switchmode) . There are also a few, very affordable, stackable, off grid solar inverters ($800 for 5kW) available that let you run them without any batteries connected at all.

    Ultimately, a CT will offer the off grid connectivity off the shelf, as it already has a 110V/240V inverter output and a AC charger input. You can then charge it at your local supercharger, or get one of those batteryless off grid solar inverters and charge it at 240V AC.

    The battery on the CT should last the OP many days, if not weeks of battery by itself.
     
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  7. lafrisbee

    lafrisbee Active Member

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    I agree. Especially as I am building a high-quality very tiny home.
     
  8. SeminoleFSU

    SeminoleFSU Voluntaryist

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    50k seems way high...
    I got two quotes for the Solark 8k installed with a roof mounted 11kW system fully EMP hardened and a battery system big enough to provide UPS like capability on my critical loads panel. Was like $33k gross 27k after rebates.

    And you might want to look at the SolArk closer. It's likely superior to what you have in a number of ways
     
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  9. SeminoleFSU

    SeminoleFSU Voluntaryist

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    And you can turn the amps way down and trickle charge the car at a much lower rate you don't need a megawatt system, you just need to overcome the vampire drain + whatever you use + efficiency losses
     
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  10. larryboy

    larryboy Member

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    OK, I have given this matter some thought and here is what I would do. I would buy a generator that runs on propane. I got a 6KW one for about $500 with shipping. I would see if propane can be delivered to your site. If it can I would buy a 500 gallon tank. you can rent a tank but if you own your tank you can shop for the cheapest propane (around here, cheapest in June). They only fill a tank to 80% to allow for expansion so your tank would give you around 400 hours of run time. At 6KW per hour you could fully charge your CT 8 or more times. If your electricity use is what I think it will be, a 3 or 4 hour run once a week will keep your truck charged up. You can go for a walk at charging time and avoid the noise. I think a real handy person could put a better muffler on it as well.
    Having propane on the site means that you could have a camp stove and BBQ grill.
    I would also consider getting a small shipping container. The small ones are 20x8 and are not very expensive. You could haul it to your site on a flatbed trailer and offload it with a winch. This would give you a place to lock up your stuff, genny, building materials, food and also a dry place to pitch a small tent. Much nicer than living in the CT. You could spray insulation and install a couple of windows and a door and dispense with the tent. Or just prop the big door open. If the CT provides enough power you could get a small fridge and even a window A/C You could install a cheap wood stove and be warm and dry if you don't get your house finished by winter. Once your house is built it could be a shop or wood shed or guest room. I hope you keep this thread up and let us know how you do.
     
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  11. lafrisbee

    lafrisbee Active Member

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    I appreciate your thinking this through for you. But so much of what I want would go against having fossil fuel even remotely associated with the site, and waste.
    As I sit I have a house full of *sugar* that I can live without. I am also engineering the very tiny home to be 10x15x10 (completely rough estimate. I'd like an even smaller footprint but I want it to have every creature comfort at a very high level...just tiny.) I may build another one even smaller if I like doing it. And that would be the guest house..or not. But I don't want to go the easy route if it lowers the standard.
    of course I'll sleep in the Tesla Utility Vehicle a few times before I make a decision. Everything will remain influx for as long as it can.
     

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