{
  "schemaVersion": 1,
  "slug": "generator-wattage-calculator",
  "category": "household",
  "kind": "implementation",
  "independentValidation": false,
  "implementationHash": "a0e41df59f8187a5fdc169b88d08841f1c82f206eea084017615a41c5da090d0",
  "provenance": "Generated from the calculation contract used by the published page. Publication is not external validation.",
  "sourceFiles": [
    "data/calculators/generator-wattage-calculator.json",
    "src/engine.js"
  ],
  "runtimeSource": "/sources/engine.txt",
  "runtimeHash": "5c888d8898afbdee36267bb9977829e1e2ac568f6677c8ee87469c139864645c",
  "scope": "The compute function records implemented equations, constants, lookup tables and custom rules. Inputs record defaults and allowed values; outputs record precision and units. Defaults are examples, not recommendations. General background references are not evidence for this specific algorithm.",
  "publishedFormula": {
    "formula": "W_surge = W_run + W_start; W_rec = W_surge x (1 + r/100); kW = W_rec/1000",
    "vars": [
      [
        "W_run",
        "total running watts"
      ],
      [
        "W_start",
        "largest motor starting surge"
      ],
      [
        "r",
        "reserve headroom %"
      ],
      [
        "W_surge",
        "surge wattage"
      ],
      [
        "W_rec",
        "recommended generator watts"
      ],
      [
        "kW",
        "recommended kilowatts"
      ]
    ],
    "note": "Only the single largest motor-starting surge is added; r is extra headroom as a percent of surge watts to cover overload and future loads."
  },
  "externalEvidence": null,
  "contract": {
    "compute": "const surgeWatts = runningWatts+largestSurge; const recommended = surgeWatts*(1+reserve/100); return { surgeWatts, recommended, recommendedKw: recommended/1000 };",
    "inputs": [
      {
        "name": "runningWatts",
        "type": "number",
        "default": 3000,
        "min": 0,
        "max": 200000,
        "step": 50,
        "slider": true
      },
      {
        "name": "largestSurge",
        "type": "number",
        "default": 2200,
        "min": 0,
        "max": 100000,
        "step": 50,
        "slider": true
      },
      {
        "name": "reserve",
        "type": "number",
        "default": 20,
        "min": 0,
        "max": 100,
        "step": 1,
        "slider": true
      }
    ],
    "outputs": [
      {
        "name": "recommendedKw",
        "precision": 2,
        "unit": "kW"
      },
      {
        "name": "surgeWatts",
        "precision": 0,
        "unit": "W"
      },
      {
        "name": "recommended",
        "precision": 0,
        "unit": "W"
      }
    ],
    "interpret": null
  }
}