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Worked decision examples

Home-energy decisions with the assumptions exposed

These pages give a useful result before you touch a calculator. They use clearly labelled illustrative assumptions, sensitivity tables and direct links back to editable tools.

Home battery payback3–20 kWh worked payback sensitivityBattery size optimiser5 kWh vs 10 kWh using daily shiftable-energy scenariosSolar + battery vs solar only5–30 kWh battery examplesSolar self-consumption2,000–8,000 kWh annual generation examplesSolar system size2–12 kWp illustrative output referencesHeat pump vs gas6,000–20,000 kWh useful heat demandEV tariffs1,000–5,000 kWh annual EV charging, whole-home viewAppliance running costs15 distinct household appliancesAir fryer vs oven1–10 uses/weekCheap-rate appliance shiftingEight household-use profilesHeat-pump dryer payback1–10 cycles/week
Important: tariff rates, installation prices, grants, product performance and household use change. These are planning examples, not current-price claims, guaranteed savings, financial advice or engineering approval.