A 30-second interpretation of what your numbers say and why.
Decision Packs
Turn a quote into a decision you understand.
Already have a solar or battery quote? Bring the costs, generation, tariffs and battery assumptions together in one free comparison, with installer questions and a downloadable record.
Free. Independent. No account or sales call required.
Solar & Battery Decision Pack
A closer look at your proposed investment.
Free to build, read and download. There is no account, no payment and no sales contact — the pack is a record for you and, if you want, for your installer.
What your free pack gives you
Side-by-side modelled options using one consistent hourly model.
The assumptions that matter and the sensitivities that could change the answer.
Questions to take to an installer and practical next steps before deciding.
Calculators or a Decision Pack?
Free calculators
- Explore costs and savings
- Enter your own figures
- Change individual assumptions
- Inspect calculation assumptions
- Keep calculation figures on your device
Decision Pack
- Explore costs and savings
- Enter your own figures
- Change individual assumptions
- Inspect calculation assumptions
- Keep calculation figures on your device
- No-solar, solar and solar-plus-battery compared in one consistent report
- Selected sensitivity cases collected together
- Installer questions matched to your figures
- Downloadable PDF decision record
Individual calculators have their own scenarios, but they are not gathered into one place.
Who it helps and what to have ready
Best when…
A pack is most useful once you have a real quotation to judge.
Have these numbers ready
- Installed cost of the solar system, plus the battery cost if one is included in the quote or you want to test adding one.
- Solar generation estimate for your roof (kWh per year, or kWp and orientation).
- Battery size (kWh), if one is included in the quote or you want to test adding one.
- Your annual household electricity consumption, including any solar you already use.
- Your import and export unit rates (pence per kWh).
What a pack is and is not
- It is an automated planning estimate built from figures you confirm, using one common hourly model.
- It is not an installer accreditation or workmanship check, and it does not replace a technical survey.
- Home by Numbers does not change the calculation to favour a provider or product.