Maturity status |  |
Supported domains | HEMS |
Overview
To provide full transparency into the cost optimal control and financial impact of the Home Energy Management System (HEMS), the Tariff Timer service offers dedicated interfaces that track costs, savings, and real-time optimization decisions.
End-user app
1. Savings Overview
The Savings Tile shown in the end-user app provides a granular breakdown of the system’s financial performance:
Timeframes: Users can toggle between daily, weekly, monthly and even yearly intervals to track short-term and long-term trends.
Cost balance: The tile shows the actual real world cost balance of the system. The tile is shown for all systems - systems that have ToU optimizations enabled but also for systems that are controlled by the Energy Optimizer (self-consumption maximization).
Savings: Savings equal the money the end user saved by covering the consumption via PV production and battery storage, thus avoiding grid supply.
Earnings: Earning equal the money the end user earned by feeding PV surplus into the grid.
Costs: Costs equal the money the end user spent by buying energy from the grid.
Comparative Analysis: The effective electricity price is compared with a baseline scenario, where all consumption is completely covered by grid supply.
The shown information can be retrieved from the API endpoint: /systems/{systemID}/costs-kpi
Disclaimer: The costs, potential savings and effective electricity prices shown are based on the configured electricity tariff and may vary due to incomplete information and individual pricing by the electricity supplier. The values shown in the tile may differ from the actual costs on the end user's electricity bill.
2. Price Transparency
End-user app: The Price Tile in the end-user app displays the current and upcoming prices as defined by the user’s configured electricity tariff. See Electricity Tariffs for Time-of-Use Optimization for a detailed description of the available tariff options.
The prices can also be retrieved via API: /systems/{systemID}/tariff/prices
3. Decision Transparency
The Decision Tile explains the cost optimal decisions based on the Time-of-Use optimization. It differentiates actions for PV, Battery, and EV assets and shows the taken decisions of the last 6 hours.
Optimization status: A percentage indicator shows what percentage of all possible decisions (one per asset, every 15min) were taken to deviate from the default self-consumption maximisation control.
15-Minute Intervals: A visual graph indicates exactly when the system made decisions for the different controllable assets.
Contextual Explanations: If possible the shown decisions provide additional information to explain why the decision was taken. E.g. saving battery power to cover an expected load later, when the electricity price is higher than now - it is more cost optimal to use grid supply now and discharge the battery later to avoid the higher electricity prices.
Xenon Dashboard:
Shows the respective off-take and feed-in prices, as well as the taken ToU optimization decisions, in an additional time series chart below the historical power and state-of-charge measurements:
