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MaroonStatic's avatar
MaroonStatic
Explorer
Apr 17, 2016

Go/no go - convert a 1994 34' Thor w/Cummins to off-grid?

Hello friends,

I've found a great opportunity but feel it may be more than I can handle. Any advice, opinions on whether to undertake the project, or hints for where to save money & time are appreciated.

The vehicle: 34' Thor XL M34Q, no slides, Cummins 6.0 w/Allison gearbox and Spartan chassis. 100gal propane tank, lavender carpet, furnishings have visible molding. 49K miles and everything starts easily and runs.

The desired end state: off-grid / passive energy living space for 1-2 people & dog year round, to be completed anywhere within the 1-5 years of planned ownership. Some resale value would be nice, but I guess scrap/move equipment into a new shell would also be possible.

The tenant/renovator: military single, never owned an RV, loves working on classic cars but has no professional experience renovating or woodworking.

The plan: start with the roof, take off the dirty a/c s and remove molded/green growth on the roof, inspect for damaged under decking. Follow guidance at http://www.greenbuildermedia.com/green-rv-living/replacing-your-rv-roof-insist-on-formaldehyde-free-luan-and-no-voc-glue for the most part, shell out xxxx for solar panels, xxx for Usb wireless, maybe some extras for any other tech/lighting, and xxx for a/c's. Follow the steps here for the rest: http://www.motorhome.com/rv-how-to/rv-tech-tips/fiddlin-on-the-roof-motorhome-rubber-roof-replacement/

Small stuff to take care of here, new tires (all 6 have some degree of dry rot so ~$2K there), propane tank needs a new gauge /resurfacing / repainting / inspect (~$700).

Then (once expenses have recovered) move to the insulation. This will be a big deal for the goal of reducing heat/energy loss. I'm thinking spray-in foam (done professionally) will be necessary on sides and overhead, more to follow on the floor in the next section. Also will need to change to double-pane windows since this model has large & many windows. That's going to also be pricey.

I havent't event gotten started on the floor or appliances yet and I'm exhausted typing...could use some encouragement because this project just seems so huge. Big question is, is it worth it?
  • I don't know if anybody can answer whether or not it's worth it besides you. From a purely financial standpoint, you will undoubtedly put more money into it than you would ever get back selling it, but that's not really your goal.

    You mentioned mold on the inside; this suggests that there may have been water leaks into the framework. Depending on the construction methods, this could mean anything from extensive remediation work to a complete rebuild. Particularly if it has a wood frame, it's likely that there is rot to the structural members. Check that very carefully before starting off. I would avoid a unit with any significant degree of water damage.

    $700 sounds high to me for the propane tank work, but I'm not really up on the going rate for such things. Once inspected, you certainly could repaint it yourself; that's just standard metal refinishing.

    You will need a lot of solar power and battery storage (and a good sized inverter) to reasonably run an air conditioner off of solar power. RV rooftop air conditioners are none too energy efficient, either; a good modern mini-split system could cut the energy use by a third for equal cooling, and even a decent household window air conditioner would also be a significant improvement.

    Frankly, if you don't need to move around, I think there are other things that would be a more useful starting point for your project. A mobile home or a largeish kit shed come to mind as possibilities. If you need to be mobile or somewhat mobile, then obviously those wouldn't work so well.
  • Time and money are the main factors in fixing up an old RV. If you have enough of each, it is worth while to pursue. If you factor in the cost of the unit as well as the cost of all planned improvements as well as your labor and it comes out to more than an equivalent new unit, then you have a decision to make. Then again, the satisfaction of fixing up an older unit the way that you want it is priceless.