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-   -   connecting two 30# lp's to a cook stove (http://www.diychatroom.com/f47/connecting-two-30-lps-cook-stove-166574/)

utilitylocator 12-15-2012 11:57 PM

connecting two 30# lp's to a cook stove
 
I have a full size Kenmore cook stove and oven. I want to put it in a cabin. I plan to run the lp line directly out the wall to a regulator and a propane bottle. The 30 and 40# bottle has caught my eye because of its size and weight. Filling two 30# tanks would be the same as three 20# bottles. Eliminating a third bottle and yet still light enough to carry. Im not sure where to start though.
**Is this ok to do in the first place? Or is there some sort of "minimum bottle size" for a full size oven and 5 burners?
**How many hours of time would I get for the amount of propane? (two 30 or 40# bottles) If the stove was used regularly to cook and bake for a family of 4, how often would the bottles need to be filled?
What size of regulator and supply line?
Does anyone know of a good source to get this information? It is MUCH cheeper to fill the bottles my self so the 30 and 40# bottle seams like the best idea.

utilitylocator 12-16-2012 11:58 PM

I found this link quite helpful in understanding lp conversion:
http://www.propane101.com/propanebtucontent.htm

Here is a link to the stove that I have:
http://www.sears.com/kenmore-30inch-freestanding-gas-range/p-02272903000P?prdNo=21&blockNo=21&blockType=G21
By my math, the total BTU draw on this appliance is 83,200 BTU's per hour at 100% use. Obviously you don’t use the stove that much so I figured I'd do some VERY CRUDE estimating..
TOP BURNERS:
Breakfast: 10 min. 1 burner 10,000 btu/hr = 1,670 btu's
10 min. 1 burner 8,000 btu/hr = 1,334 btu's
Lunch: 20 min. 1 burner 12,000 btu/hr = 4,000 btu's
10 min. 1 burner 8,000 btu/hr = 1,334 btu's
Dinner: 20 min. 1 burner 15,000 btu/hr = 5,000 bt
15 min. 1 burner 7,000 btu/hr = 1,750 btu's
10 min. 1 burner 5,000 btu/hr = 834 btu's
TOTAL: DAILY USE = 15922 btu's
This is an estimate of max daily use on average. Some days, a meal or two may be microwaved or ordered in or the meal may simply need less cooking. Other days the usage may be higher if a larger meal is being cooked. I'm not the cook so if I way over shot these number's than I guess the tanks will last even longer. The oven most likely wouldn’t be used daily so I would average 4 times a week usage at 50 minutes each at 16,000 btu's/hr making for a total weekly usage of 53,340 btu's
Using this formula, I expect to use approximately 69,262 btu's a week in propane consumption.

utilitylocator 12-17-2012 12:03 AM

Here is a link to the bottles that I am considering:
http://www.missiongas.com/lpgascylinders.htm
The 30# bottle holds 640,500 btu’s when full…
Multiply that by two and you have 1,280,000 btu’s of propane. I hope… See, It doesn’t say if that is if filled to 100% or 80%. State law say’s 80% max filled. So if we subtract 20% from that number to be on the safe side, we have 1,056,000 btu’s of usable lp gas.

Earlier, I concluded that my max average weekly use was 53,340 btu’s. I now know that two 30# bottles store a minimum of 1,056,000 btu’s.
1,056,000/53,340=19.75 weeks of usage. (4 to 6 months of usage)



utilitylocator 12-17-2012 12:14 AM

Supply line and regulator
 
*What size copper tubing do I need?
*Will the regulator I currently have for a 330# tank work?
*How do I connect the two bottles and tie it all in?
*can I put a guage inline somehow to see how much propane is left?
These are some of the questions that I am working on now… The line will be only a few feet long since the stove is on the same wall as the bottles, (almost back to back so to speak.) I assume that it would be no different than one on a travel trailer’s set up.

Lowes has the 30# bottle in stock for $62 each:
http://www.lowes.com/pd_6396-743-300...tank&facetInfo=







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