CONSIDERED HOME ENERGY TOOLKIT
Home Energy Quick Estimate
Four quick questions and a rough answer on whether solar or a home battery could be worth it — for when you don't have a quote or exact figures to hand yet.
✓ Just four questions, no quote needed
✓ Typical UK assumptions filled in for you
✓ Links through to the full calculator for precise figures
This is a simplified companion to the Home Energy Investment Calculator. It fills in typical UK rates, system sizes and long-term assumptions so you only have to answer four questions. It is illustrative only, not financial advice.
FOUR QUICK QUESTIONS
About your home
Answer what you know — everything else uses a typical UK assumption.
Roughly what size is your property?Used to estimate a typical solar array and battery size
See the typical assumptions used
Your estimate will appear here
Enter your annual bill (or just try the defaults) to see a rough payback estimate for your home.
Your system could pay for itself in about 12 years
What this suggests
Want a more accurate answer? Enter your real tariff, quote and assumptions in the full calculator.
Open the full calculatorIllustrative only, not financial advice. This estimate uses typical UK rates and system sizes, not your own quote or tariff. Real results depend on your actual usage, installer price, roof and tariff.
How this estimate works
This tool asks for your annual electricity bill and converts it to an estimated annual usage using a typical blended import rate (27p/kWh peak, 8p/kWh off-peak, with a fifth of use assumed off-peak). It then sizes a solar array and/or battery based on the property size you choose, and runs the same year-by-year model as the full Home Energy Investment Calculator: solar generation and degradation, direct use versus stored versus exported energy, battery charging and round-trip losses, energy price inflation, and ongoing maintenance and inverter replacement costs.
The difference is entirely in the inputs. The full calculator lets you replace every one of these assumptions with your own bills, installer quote and tariff; this tool fills them in with typical UK figures so you can get a rough answer with almost no information.
Important: because so much is assumed rather than entered by you, treat the result as a starting point for deciding whether to get a real quote — not as a substitute for one.