{
  "id": "v20-uk-solar-battery",
  "version": "20.16.0",
  "name": "Solar Battery Sizing Calculator — United Kingdom",
  "shortName": "Solar Battery Sizing",
  "description": "Size an energy reserve for an explicitly selected critical load, rather than assume that the battery can supply every household circuit. GBP planning view; stated limitations apply.",
  "category": "Home & Construction",
  "categorySlug": "home-construction",
  "keywords": [
    "solar-battery",
    "uk",
    "energy-conservation",
    "pvwatts",
    "energy-saver"
  ],
  "status": "live",
  "workStatus": "pending",
  "reviewStatus": "pending",
  "migrationStatus": "new",
  "engine": "native",
  "creator": null,
  "reviewer": null,
  "quality": {
    "availability": "live",
    "technicalReviewRecord": "/reviews/v20-uk-solar-battery.json",
    "qualifiedReview": "pending",
    "qualifiedReviewer": null,
    "qualifiedReviewDate": null,
    "formulaVersion": "20.16.0",
    "referenceCoverage": "references-listed",
    "releaseTestScope": "Catalog and regression checks are not a professional formula audit; consult release evidence.",
    "historicalMetadataDate": "",
    "historicalMetadataNotice": "The imported date is not evidence of a completed human review."
  },
  "notice": "Illustrative defaults are not local quotes or verified legal rules. Dated reference components and user-entered assumptions are explicitly distinguished. Professional review is pending.",
  "urls": {
    "page": "/uk/solar-battery/",
    "definition": "/uk/solar-battery/definition.json",
    "schema": "/uk/solar-battery/schema.json",
    "llms": "/uk/solar-battery/llms.txt",
    "legacyDefinition": "/uk/solar-battery/definition.json"
  },
  "queryExample": "https://askcalculators.com/uk/solar-battery/?criticalDailyUse=10&autonomyDays=1&usablePercent=90&dischargeEfficiency=95&moduleCapacity=5&unitRate=0&laborCost=0&deliveryCost=0&otherCost=0&costMultiplier=1&spreadPercent=15&taxRate=0",
  "queryParameters": {
    "criticalDailyUse": {
      "label": "Critical daily load, kWh",
      "type": "number",
      "required": true,
      "default": 10
    },
    "autonomyDays": {
      "label": "Target autonomy, days",
      "type": "number",
      "required": true,
      "default": 1
    },
    "usablePercent": {
      "label": "Usable depth of discharge",
      "type": "percent",
      "required": true,
      "default": 90
    },
    "dischargeEfficiency": {
      "label": "Discharge efficiency",
      "type": "percent",
      "required": true,
      "default": 95
    },
    "moduleCapacity": {
      "label": "One battery module, nameplate kWh",
      "type": "number",
      "required": true,
      "default": 5
    },
    "unitRate": {
      "label": "Material price per module",
      "type": "money",
      "required": true,
      "default": 0
    },
    "laborCost": {
      "label": "Total labor allowance",
      "type": "money",
      "required": true,
      "default": 0
    },
    "deliveryCost": {
      "label": "Delivery allowance",
      "type": "money",
      "required": true,
      "default": 0
    },
    "otherCost": {
      "label": "Other fixed costs",
      "type": "money",
      "required": true,
      "default": 0
    },
    "costMultiplier": {
      "label": "Material/labor multiplier",
      "type": "number",
      "required": true,
      "default": 1
    },
    "spreadPercent": {
      "label": "Low/high sensitivity around the entered total",
      "type": "percent",
      "required": true,
      "default": 15
    },
    "taxRate": {
      "label": "Explicit tax allowance",
      "type": "percent",
      "required": true,
      "default": 0
    }
  },
  "inputs": [
    {
      "id": "criticalDailyUse",
      "label": "Critical daily load, kWh",
      "type": "number",
      "defaultValue": 10,
      "required": true,
      "min": 0,
      "max": 1000000,
      "step": 0.01,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "autonomyDays",
      "label": "Target autonomy, days",
      "type": "number",
      "defaultValue": 1,
      "required": true,
      "min": 0,
      "max": 30,
      "step": 0.01,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "usablePercent",
      "label": "Usable depth of discharge",
      "type": "percent",
      "defaultValue": 90,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "dischargeEfficiency",
      "label": "Discharge efficiency",
      "type": "percent",
      "defaultValue": 95,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "moduleCapacity",
      "label": "One battery module, nameplate kWh",
      "type": "number",
      "defaultValue": 5,
      "required": true,
      "min": 0.01,
      "max": 100000,
      "step": 0.01,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "unitRate",
      "label": "Material price per module",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "help": "Zero means unpriced, not free. Enter a current, scoped supplier quote. Illustrative starting value; replace with your own evidence.",
      "prefix": "GBP"
    },
    {
      "id": "laborCost",
      "label": "Total labor allowance",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "GBP",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "deliveryCost",
      "label": "Delivery allowance",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "GBP",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "otherCost",
      "label": "Other fixed costs",
      "type": "money",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 1000000000000,
      "step": 0.01,
      "prefix": "GBP",
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "costMultiplier",
      "label": "Material/labor multiplier",
      "type": "number",
      "defaultValue": 1,
      "required": true,
      "min": 0.1,
      "max": 10,
      "step": 0.01,
      "help": "Use a verified regional index only when supplied. 1 is an unadjusted scenario, not a researched index. Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "spreadPercent",
      "label": "Low/high sensitivity around the entered total",
      "type": "percent",
      "defaultValue": 15,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    },
    {
      "id": "taxRate",
      "label": "Explicit tax allowance",
      "type": "percent",
      "defaultValue": 0,
      "required": true,
      "min": 0,
      "max": 100,
      "step": 0.1,
      "help": "Illustrative starting value; replace with your own evidence."
    }
  ],
  "outputs": [
    {
      "id": "requiredNameplate",
      "label": "Required nameplate storage, kWh",
      "format": "number",
      "digits": 2
    },
    {
      "id": "modules",
      "label": "Whole battery modules",
      "format": "number",
      "digits": 2
    },
    {
      "id": "installedCapacity",
      "label": "Installed nameplate storage, kWh",
      "format": "number",
      "digits": 2
    },
    {
      "id": "deliveredEnergy",
      "label": "Modeled usable delivered energy, kWh",
      "format": "number",
      "digits": 2
    },
    {
      "id": "materialCost",
      "label": "Material cost",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    },
    {
      "id": "laborCost",
      "label": "Labor allowance",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    },
    {
      "id": "deliveryCost",
      "label": "Delivery allowance",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    },
    {
      "id": "otherCost",
      "label": "Other specified costs",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    },
    {
      "id": "tax",
      "label": "Entered tax allowance",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    },
    {
      "id": "low",
      "label": "Low cost scenario",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    },
    {
      "id": "mid",
      "label": "Middle cost scenario",
      "format": "currency",
      "digits": 2,
      "primary": true,
      "currency": "GBP"
    },
    {
      "id": "high",
      "label": "High cost scenario",
      "format": "currency",
      "digits": 2,
      "currency": "GBP"
    }
  ],
  "formula": {
    "expression": "required nameplate kWh = critical load × days ÷ (usable fraction × discharge efficiency).",
    "note": "Inputs are converted to canonical units before evaluating this stated formula."
  },
  "examples": [
    {
      "label": "Illustrative defaults; required verification checks remain unconfirmed",
      "inputs": {
        "unitSystem": "metric",
        "criticalDailyUse": 10,
        "autonomyDays": 1,
        "usablePercent": 90,
        "dischargeEfficiency": 95,
        "moduleCapacity": 5,
        "unitRate": 0,
        "laborCost": 0,
        "deliveryCost": 0,
        "otherCost": 0,
        "costMultiplier": 1,
        "spreadPercent": 15,
        "taxRate": 0
      }
    }
  ],
  "sources": [
    {
      "label": "DOE energy-use arithmetic",
      "url": "https://www.energy.gov/energysaver/save-electricity-and-fuel/appliances-and-electronics/estimating-appliance-and-home"
    },
    {
      "label": "PVWatts: site-specific solar estimation",
      "url": "https://pvwatts.nlr.gov/"
    },
    {
      "label": "DOE insulation overview",
      "url": "https://www.energy.gov/energysaver/weatherize/insulation"
    }
  ],
  "publicSlug": "solar-battery",
  "namespace": "uk",
  "countries": [
    "us",
    "ca",
    "uk",
    "ie"
  ]
}