WattDecide
Get notified

Decision-grade models
for home tech investments.

A small set of transparent, versioned models to help you make confident calls on EVs, solar, heat pumps, tariffs, and batteries. Built like an analyst tool – clear assumptions, sensible scenarios, and outputs you can defend.

Join the list What it includes
Coming soon. Email only for updates. Unsubscribe any time.

What it includes

  • ✓ Household cashflows, break-even, and NPV with a clearly defined time horizon.
  • ✓ Sensitivity and “what must be true?” thresholds (price, usage, tariff spread, discount rate).
  • ✓ Scenario packs (baseline + stress cases) that reflect real-world uncertainty.
  • ✓ A clean output page you can save or share with assumptions attached.

How it’s built

  • ✓ Documented methods – every number is traceable to an assumption.
  • ✓ Versioned releases – you can see what changed and why.
  • ✓ Focus on decision quality – no vanity dashboards, no fluff.
  • ✓ Privacy-first – email is only used to notify you about releases.
© WattDecide
Privacy