Maturity status
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Supported domains
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HEMS
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Overview
When Program Charge is activated, the Time-Of-Use optimization schedules EV charging to achieve the user’s desired State of Charge (SOC) by the configured departure time at the lowest possible cost.
To optimize charging costs, the system intelligently combines:
available solar surplus,
and the cheapest available grid price intervals during the plug-in window.
The optimization always prioritizes the user’s mobility requirements, ensuring the configured departure target is met whenever technically feasible.
Comparison: Standard vs. Time-of-Use Optimization
Self-Sufficiency Optimization (Tariff-Timer): Primarily prioritizes charging the EV using solar surplus energy. Grid charging is only initiated at the latest possible time required to reach the configured SOC target before departure.
Time-of-Use Optimization: Actively optimizes charging across the entire plug-in duration by selecting the lowest-cost charging intervals based on dynamic electricity prices. The system combines:
low-price grid charging,
solar surplus usage,
and user mobility requirements
to minimize the total charging cost while ensuring the desired departure SOC is reached.
User Interface & Insights
The XENON UI provides transparency into the current charging logic through optimization insights. The insight indicates whether the charging session is currently:
optimizing charging costs by taking advantage of favorable electricity prices, or
prioritizing the configured departure target and desired state of charge regardless of current electricity prices.
The latter may occur when the remaining time until departure is too short to wait for a more favorable charging window.
This helps users understand whether the charging behavior is currently driven by economic optimization or mobility requirements.
Example Tariff-Timer decision insight:
