{
  "version": "2026-11-02",
  "evidenceType": "Authored scenarios, not measured homes, device defaults or battery specifications.",
  "method": "The same calculateBackupLoad engine is used by the guide and interactive worksheet. Deliverable energy = 10 kWh × 90% remaining after reserve × 90% inverter efficiency = 8.1 kWh. Continuous target energy = running kW × target hours. Round battery count up. Hours/day stays at 8 when comparing target durations, exactly as in the worksheet; daily schedule energy and continuous target energy are separate.",
  "limitations": "No solar recharge, cycling schedule, surge, inverter power/voltage check, battery degradation or circuit design. Capacity is before inverter losses; if a specification already gives delivered AC capacity, use 100% efficiency instead of deducting inverter losses twice.",
  "rows": [
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 500,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 4
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 500,
        "totalRunningKW": 0.5,
        "dailyEnergyKWh": 4,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 16.2,
        "targetEnergyKWh": 2,
        "batteriesNeededForTarget": 1
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 500,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 8
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 500,
        "totalRunningKW": 0.5,
        "dailyEnergyKWh": 4,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 16.2,
        "targetEnergyKWh": 4,
        "batteriesNeededForTarget": 1
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 500,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 12
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 500,
        "totalRunningKW": 0.5,
        "dailyEnergyKWh": 4,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 16.2,
        "targetEnergyKWh": 6,
        "batteriesNeededForTarget": 1
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 500,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 24
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 500,
        "totalRunningKW": 0.5,
        "dailyEnergyKWh": 4,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 16.2,
        "targetEnergyKWh": 12,
        "batteriesNeededForTarget": 2
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 750,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 4
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 750,
        "totalRunningKW": 0.75,
        "dailyEnergyKWh": 6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 10.799999999999999,
        "targetEnergyKWh": 3,
        "batteriesNeededForTarget": 1
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 750,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 8
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 750,
        "totalRunningKW": 0.75,
        "dailyEnergyKWh": 6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 10.799999999999999,
        "targetEnergyKWh": 6,
        "batteriesNeededForTarget": 1
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 750,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 12
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 750,
        "totalRunningKW": 0.75,
        "dailyEnergyKWh": 6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 10.799999999999999,
        "targetEnergyKWh": 9,
        "batteriesNeededForTarget": 2
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 750,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 24
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 750,
        "totalRunningKW": 0.75,
        "dailyEnergyKWh": 6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 10.799999999999999,
        "targetEnergyKWh": 18,
        "batteriesNeededForTarget": 3
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 1200,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 4
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 1200,
        "totalRunningKW": 1.2,
        "dailyEnergyKWh": 9.6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 6.75,
        "targetEnergyKWh": 4.8,
        "batteriesNeededForTarget": 1
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 1200,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 8
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 1200,
        "totalRunningKW": 1.2,
        "dailyEnergyKWh": 9.6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 6.75,
        "targetEnergyKWh": 9.6,
        "batteriesNeededForTarget": 2
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 1200,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 12
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 1200,
        "totalRunningKW": 1.2,
        "dailyEnergyKWh": 9.6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 6.75,
        "targetEnergyKWh": 14.399999999999999,
        "batteriesNeededForTarget": 2
      }
    },
    {
      "input": {
        "loads": [
          {
            "name": "Authored constant load",
            "runningWatts": 1200,
            "quantity": 1,
            "hoursPerDay": 8
          }
        ],
        "batteryUsableCapacityKWh": 10,
        "reservePercent": 10,
        "inverterEfficiencyPercent": 90,
        "targetHours": 24
      },
      "result": {
        "activeLoadCount": 1,
        "totalRunningWatts": 1200,
        "totalRunningKW": 1.2,
        "dailyEnergyKWh": 9.6,
        "deliverableBatteryKWh": 8.1,
        "staticRuntimeHours": 6.75,
        "targetEnergyKWh": 28.799999999999997,
        "batteriesNeededForTarget": 4
      }
    }
  ]
}