For a 10 kWh home battery in Austria, this analysis uses real day-ahead EPEX spot prices (via aWATTar) and Vienna weather (via Open-Meteo) to compare an AI-optimised charge/discharge strategy against a basic time-of-day timer. Period covered: June 13 – 19, 2026.
The optimal strategy earned €9.60 over the week versus €4.04 for the basic timer — a +138% uplift, projecting to roughly €438 per year for a single 10 kWh battery cycled once per day.
Average temperature was 22.0°C, with 80 hours of strong sunshine (solar ≥ 200 W/m²), average wind 10.3 km/h, and 8.8 mm of rainfall over the week.
Solar irradiance and spot price correlated at r=-0.60 (solar lowers prices), wind at r=-0.41 (wind lowers prices). These match what you would expect: more renewable feed-in pushes prices down, so the optimal strategy is to charge during high-renewable, low-price hours and discharge in the evening peak.
| Date | Optimal Strategy | Basic Timer | Spread | Weather |
|---|---|---|---|---|
| 2026-06-12 | €0.00 | €0.00 | 0.0 ct/kWh | 15°C · ☀ 0 W/m² · 💨 16 km/h |
| 2026-06-13 | €1.17 | €0.42 | 13.0 ct/kWh | 20°C · ☀ 708 W/m² · 💨 14 km/h |
| 2026-06-14 | €1.18 | €0.79 | 13.1 ct/kWh | 19°C · ☀ 794 W/m² · 💨 12 km/h |
| 2026-06-15 | €1.26 | €0.49 | 14.0 ct/kWh | 19°C · ☀ 752 W/m² · 💨 10 km/h |
| 2026-06-16 | €1.26 | €0.35 | 14.0 ct/kWh | 21°C · ☀ 903 W/m² · 💨 10 km/h |
| 2026-06-17 | €0.86 | €0.21 | 9.6 ct/kWh | 23°C · ☀ 732 W/m² · 💨 11 km/h |
| 2026-06-18 | €2.50 | €1.45 | 27.8 ct/kWh | 26°C · ☀ 644 W/m² · 💨 6 km/h |
| 2026-06-19 | €1.36 | €0.33 | 15.2 ct/kWh | 27°C · ☀ 743 W/m² · 💨 8 km/h |
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