Maturity status
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Supported domains
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HEMS
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Overview
When user selects Program Charge mode, Tariff-Timer continuously evaluates electricity prices, feed-in tariffs, solar surplus availability, and future charging opportunities to determine the most economically beneficial charging strategy.
If the current feed-in tariff is sufficiently high, the optimization may prioritize exporting available PV energy to the grid instead of immediately charging the EV.
In these cases, the system can temporarily export the available surplus energy and schedule EV charging later during forecasted lower-price grid intervals. The optimization continuously balances:
solar production forecasts and feed-in opportunities,
future electricity prices,
EV charging constraints,
and user mobility requirements
while still ensuring the configured desired SOC is reached whenever technically feasible.
User Interface & Logic Transparency
To help users understand why EV charging is temporarily prevented, the XENON UI provides transparent optimization insights.
The insight includes:
the prevention period,
the current feed-in tariff used for the export decision,
and the planned lower-price charging window scheduled by the optimization.
This helps users understand that available PV surplus is intentionally exported to the grid before the EV is charged later at a more economically favorable time.
Example Tariff-Timer decision insight:
