Maturity status
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Supported domains
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HEMS
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Overview
When Discharge to grid is active, Tariff-Timer may intentionally discharge battery energy to the grid during periods of favorable feed-in prices. The Discharge to Grid function is triggered by a significant price difference between the battery's charging interval and its discharging interval.
To maximize economic benefit, the system continuously evaluates:
forecasted feed-in tariffs,
battery efficiency losses,
battery charging origin,
battery constraints,
and forecasted PV surplus availability.
Battery energy may originate from previously stored PV surplus or from earlier low-price grid charging intervals.
Discharging to the grid is only triggered when the expected financial benefit exceeds configured profitability thresholds after accounting for battery efficiency losses and other constraints like the devaluation of the battery. During active discharge periods, available PV surplus may also be exported directly to the grid to further benefit from favorable feed-in prices.
Configuration & Restrictions
Battery discharge to the grid is disabled by default in XENON.
In some countries or installations, local regulations, utility restrictions, or hardware limitations may prohibit exporting battery energy to the grid.
This functionality must therefore be explicitly enabled and may not be available in all supported installations.
User Interface & Logic Transparency
To help users understand why the battery is currently discharging to the grid, the XENON UI provides transparent optimization insights.
The insight includes:
the planned discharge period,
the favorable feed-in tariff triggering the discharge,
and information that available PV surplus may also be exported during this period to maximize economic benefit.
This helps users understand that the discharge behavior is intentional and economically optimized.
