Synthetic project scenario
A transparent comparison for one invented household
This portfolio scenario connects planning questions with the estimator’s approved default example. It is not a customer story, installation, or recommendation.
Illustrative inputs
The same four values used by the default estimator
- Average monthly bill
- €120
- Usable roof area
- 35 m²
- Daytime electricity use
- 30%
- Selected comparison
- Solar + battery
Invented household context
Questions that can be considered together
The scenario imagines a household comparing usable roof space, daytime demand, evening electricity use, and future vehicle charging. Those details provide a content journey, not a technical brief.
Solar and battery are selected for comparison because the synthetic household wants to explore energy timing. No equipment, capacity, charger, price, installation, or property outcome is specified.
Illustrative model output
A comparison, not a forecast
For the approved default inputs, the deterministic model produces an illustrative annual reduction of €540–€720.
The figures exclude system cost, finance, maintenance, tariffs, export payments, and payback. They are not guaranteed savings.
- Synthetic current annual cost
- €1,440
- Illustrative cost with solar
- €900
- Illustrative cost with solar and battery
- €720
Model boundaries
What the simplified calculation leaves out
- Current annual cost is the monthly input multiplied by 12 and rounded to the nearest €10.
- Roof area and daytime-use percentage feed a synthetic reduction rule; they are not generation or engineering calculations.
- The battery toggle selects a simplified comparison and does not represent capacity, efficiency, degradation, or backup operation.
- Location, orientation, shading, equipment, tariffs, export, installation cost, and property suitability are not modelled.
Adjusting the inputs demonstrates an accessible browser interaction; it cannot determine what should be installed at a home.