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 7 – 13, 2026.
The optimal strategy earned €7.14 over the week versus €2.07 for the basic timer — a +246% uplift, projecting to roughly €325 per year for a single 10 kWh battery cycled once per day.
Average temperature was 18.5°C, with 76 hours of strong sunshine (solar ≥ 200 W/m²), average wind 11.9 km/h, and 36.0 mm of rainfall over the week.
Solar irradiance and spot price correlated at r=-0.65 (solar lowers prices), wind at r=-0.13 (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 |
|---|---|---|---|---|
| 2026-06-06 | €0.00 | €0.00 | 0.0 ct/kWh | 18°C · ☀ 0 W/m² · 💨 3 km/h |
| 2026-06-07 | €1.50 | €0.87 | 16.7 ct/kWh | 21°C · ☀ 860 W/m² · 💨 11 km/h |
| 2026-06-08 | €1.01 | €0.26 | 11.2 ct/kWh | 23°C · ☀ 867 W/m² · 💨 7 km/h |
| 2026-06-09 | €0.91 | €0.13 | 10.2 ct/kWh | 21°C · ☀ 680 W/m² · 💨 8 km/h |
| 2026-06-10 | €0.81 | €0.28 | 9.0 ct/kWh | 15°C · ☀ 375 W/m² · 💨 12 km/h |
| 2026-06-11 | €1.24 | €0.09 | 13.8 ct/kWh | 14°C · ☀ 812 W/m² · 💨 17 km/h |
| 2026-06-12 | €0.49 | €0.01 | 5.4 ct/kWh | 15°C · ☀ 722 W/m² · 💨 15 km/h |
| 2026-06-13 | €1.17 | €0.42 | 13.0 ct/kWh | 20°C · ☀ 708 W/m² · 💨 14 km/h |
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