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 20 – 26, 2026.
The optimal strategy earned €14.68 over the week versus €7.49 for the basic timer — a +96% uplift, projecting to roughly €669 per year for a single 10 kWh battery cycled once per day.
Average temperature was 28.1°C, with 83 hours of strong sunshine (solar ≥ 200 W/m²), average wind 6.4 km/h, and 10.5 mm of rainfall over the week.
Solar irradiance and spot price correlated at r=-0.54 (solar lowers prices), wind at r=-0.02 (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 |
|---|---|---|---|---|
| 2026-06-19 | €0.00 | €0.00 | 0.0 ct/kWh | 25°C · ☀ 0 W/m² · 💨 7 km/h |
| 2026-06-20 | €1.42 | €0.42 | 15.8 ct/kWh | 28°C · ☀ 825 W/m² · 💨 7 km/h |
| 2026-06-21 | €1.31 | €0.27 | 14.6 ct/kWh | 29°C · ☀ 862 W/m² · 💨 7 km/h |
| 2026-06-22 | €1.63 | €0.70 | 18.1 ct/kWh | 27°C · ☀ 777 W/m² · 💨 8 km/h |
| 2026-06-23 | €3.01 | €1.95 | 33.4 ct/kWh | 27°C · ☀ 811 W/m² · 💨 8 km/h |
| 2026-06-24 | €3.98 | €2.71 | 44.3 ct/kWh | 27°C · ☀ 875 W/m² · 💨 6 km/h |
| 2026-06-25 | €1.47 | €0.48 | 16.3 ct/kWh | 29°C · ☀ 825 W/m² · 💨 5 km/h |
| 2026-06-26 | €1.86 | €0.96 | 20.6 ct/kWh | 30°C · ☀ 863 W/m² · 💨 4 km/h |
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