{
  "name": "Propane runtime JSON endpoint",
  "description": "Returns usable propane, daily BTU demand, pounds and gallons per day, estimated days, refill timing, and furnace-dominance warnings.",
  "publisher": {
    "name": "OffGridRVHub",
    "url": "https://www.offgridrvhub.com"
  },
  "source": {
    "endpoint": "https://www.offgridrvhub.com/tools/api/propane-runtime.json",
    "fullCalculator": "https://www.offgridrvhub.com/tools/propane-runtime-calculator",
    "assumptions": "https://www.offgridrvhub.com/tools/calculator-assumptions",
    "documentation": "https://www.offgridrvhub.com/tools/calculator-api"
  },
  "caveat": "This is a planning estimate for RV education and comparison. It is not electrical, plumbing, safety, or installation advice.",
  "input": {
    "propaneCapacityPounds": 40,
    "furnaceBtuPerHour": 30000,
    "furnaceHoursPerDay": 8,
    "furnaceDutyCyclePercent": 30,
    "fridgeBtuPerDay": 10000,
    "waterHeaterBtuPerDay": 8000,
    "cookingBtuPerDay": 3000,
    "otherBtuPerDay": 0,
    "reservePercent": 15
  },
  "result": {
    "usablePropanePounds": 34,
    "usablePropaneGallons": 8,
    "furnaceDailyBtu": 72000,
    "totalDailyBtu": 93000,
    "dailyPropanePounds": 4.31,
    "dailyPropaneGallons": 1.02,
    "estimatedDays": 7.9,
    "refillAtDays": 6.3,
    "furnaceSharePercent": 77,
    "winterRisk": true,
    "lowUse": false,
    "verdictTitle": "Propane is workable, but watch the weather",
    "verdictDetail": "With 34 usable pounds after reserve, this setup uses about 4.31 lb per day and lasts roughly 7.9 days on the entered assumptions.",
    "recommendedNextMove": "Build the plan around colder-than-average nights: carry more propane, reduce thermostat demand, skirt or insulate weak spots, or shorten the stay.",
    "watchOuts": [
      "Propane use changes quickly with wind, insulation, thermostat setting, altitude, appliance condition, and how often doors open.",
      "A 20 lb cylinder means about 20 lb of propane when filled, not 20 gallons. This calculator uses pounds as the capacity input.",
      "The furnace dominates this estimate. Cold snaps, wind, and slide-outs can shorten runtime faster than mild-weather averages suggest."
    ]
  }
}