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Overview
When feed-in prices are dynamic, Tariff-Timer determines whether PV surplus should be:
exported directly to the grid, or
stored in the battery for later use
The decision is based on current and forecasted feed-in prices, future consumption needs, and battery state of charge.
This typically occurs during periods of high PV generation, such as summer days, when available solar surplus exceeds either the battery’s remaining capacity or the expected short-term household demand.
Optimization Logic: Store vs. Sell
The system continuously compares the value of immediate export against the expected future value of stored energy.
High feed-in price periods: PV surplus is prioritized for direct export to the grid when current feed-in prices are more favorable than the expected future value of storing and later discharging that energy.
Low feed-in price periods: PV surplus is prioritized for charging the battery when future expected feed-in prices or self-consumption value are higher than immediate export value.
User Interface & Logic Transparency
The XENON UI provides clear insights into the current decision:
Battery charging is prevented when PV surplus is exported due to favorable feed-in prices
Battery is charged with PV surplus when storing energy is more valuable than immediate export
The insight shows the active price signal and the scheduled or implied alternative use of energy
