{
  "starting": {
    "resultSchema": "infrastructure-screen-1",
    "contentVersion": "2.0.0",
    "modelVersion": "1.0.0",
    "lessonId": "ups-battery-station-dc",
    "model": "storageScreen",
    "inputs": {
      "acKW": 2250,
      "minutes": 10,
      "efficiency": 0.95,
      "dischargeFraction": 0.8,
      "retainedAgeFraction": 0.8,
      "minDcV": 420
    },
    "outputs": {
      "acKWh": 375,
      "deliveredDcKWh": 394.7368421052632,
      "nominalKWh": 616.7763157894736,
      "dcA": 5639.097744360903
    },
    "inputUnits": {
      "acKW": "kW AC",
      "minutes": "min",
      "efficiency": "ratio",
      "dischargeFraction": "ratio",
      "retainedAgeFraction": "ratio",
      "minDcV": "V DC"
    },
    "outputUnits": {
      "acKWh": "kWh AC",
      "deliveredDcKWh": "kWh DC",
      "nominalKWh": "kWh nominal",
      "dcA": "A DC"
    },
    "assumptions": [
      "The constant-power screen applies scalar conversion, usable-discharge and retained-age fractions.",
      "Do not call output energy nominal capacity: A 2,250 kW output for ten minutes supplies 375 kWh AC. With illustrative discharge-path efficiency of 0.95, the delivered DC requirement is 394.74 kWh. With additional illustrative usable-discharge and retained-age fractions of 0.8 each, the nominal-energy screen becomes 616.78 kWh. These scalar factors explain the bookkeeping, not a universal chemistry-specific battery sizing method. Manufacturer discharge curves and voltage limits remain necessary."
    ],
    "limitations": [
      "Educational screen only; no equipment selection, facility calibration, professional review or certification.",
      "No dynamics, protection coordination, site conditions or manufacturer-specific behavior are inferred.",
      "No product selection, chemistry approval, protection coordination or fire strategy.",
      "UPS module capacity does not establish battery or distribution redundancy."
    ],
    "sourceLocators": [
      {
        "id": "DCIE-R1",
        "chapter": 5,
        "pdfPages": [
          26,
          29
        ],
        "evidenceStatus": "manuscript-derived; not independent source verification"
      }
    ],
    "inputHash": "50227baf0ef86c8d55eb222710992d7ad046cd3363c0ae7e1f7f75357d434717",
    "sourceRevision": "e4d47bd6616aa54e19c7da5ee4e2a98afe6209c1",
    "independentEngineeringVerification": false,
    "resultHash": "8571c6bc491981c2442ec64b7bf57e9c77b4924ceb46db9a8fa651d4ea56c90f"
  },
  "challenge": {
    "resultSchema": "infrastructure-screen-1",
    "contentVersion": "2.0.0",
    "modelVersion": "1.0.0",
    "lessonId": "ups-battery-station-dc",
    "model": "storageScreen",
    "inputs": {
      "acKW": 2250,
      "minutes": 15,
      "efficiency": 0.95,
      "dischargeFraction": 0.8,
      "retainedAgeFraction": 0.8,
      "minDcV": 420
    },
    "outputs": {
      "acKWh": 562.5,
      "deliveredDcKWh": 592.1052631578948,
      "nominalKWh": 925.1644736842104,
      "dcA": 5639.097744360903
    },
    "inputUnits": {
      "acKW": "kW AC",
      "minutes": "min",
      "efficiency": "ratio",
      "dischargeFraction": "ratio",
      "retainedAgeFraction": "ratio",
      "minDcV": "V DC"
    },
    "outputUnits": {
      "acKWh": "kWh AC",
      "deliveredDcKWh": "kWh DC",
      "nominalKWh": "kWh nominal",
      "dcA": "A DC"
    },
    "assumptions": [
      "The constant-power screen applies scalar conversion, usable-discharge and retained-age fractions.",
      "Do not call output energy nominal capacity: A 2,250 kW output for ten minutes supplies 375 kWh AC. With illustrative discharge-path efficiency of 0.95, the delivered DC requirement is 394.74 kWh. With additional illustrative usable-discharge and retained-age fractions of 0.8 each, the nominal-energy screen becomes 616.78 kWh. These scalar factors explain the bookkeeping, not a universal chemistry-specific battery sizing method. Manufacturer discharge curves and voltage limits remain necessary."
    ],
    "limitations": [
      "Educational screen only; no equipment selection, facility calibration, professional review or certification.",
      "No dynamics, protection coordination, site conditions or manufacturer-specific behavior are inferred.",
      "No product selection, chemistry approval, protection coordination or fire strategy.",
      "UPS module capacity does not establish battery or distribution redundancy."
    ],
    "sourceLocators": [
      {
        "id": "DCIE-R1",
        "chapter": 5,
        "pdfPages": [
          26,
          29
        ],
        "evidenceStatus": "manuscript-derived; not independent source verification"
      }
    ],
    "inputHash": "97241de1fefe6fd5b14bde92a679d0a1456ae9fadbe977e5789fb7cc1b8ec398",
    "sourceRevision": "e4d47bd6616aa54e19c7da5ee4e2a98afe6209c1",
    "independentEngineeringVerification": false,
    "resultHash": "bac8f10397b4c88eb63a5d39b7993c1220faecede80eb7249f6b10a150a78fd7"
  },
  "fuel": null,
  "engineeringDecision": "HOLD"
}