Entering Peak Load Shaving
This function was primarily developed for the Belgian Market and may not be useable yet in other countries.
In addition to optimizing the self-consumption portion by integrating electrical loads into the energy management system and what is known as atypical grid use (switching on loads specifically at times when your solar system is providing a lot of its own energy), you can save further electricity costs by reducing your power consumption from the utility grid through intelligent setting of your battery storage system.
An increased energy demand at certain times of day (e.g. in the morning or in the evening) leads to so-called load peaks, which can have you classified into a higher tariff category.
The battery-storage system allows you to capture, i.e. "shave" these load peaks with stored electric current. The following settings are used for this:
Setting | Explanation |
|---|---|
Peak load shaving | By activating the operating mode "Peak load shaving", you can specify the maximum power supply from the utility grid as well as a limiting value for the portion of the total storage capacity of the battery system for the peak load shaving. |
Purchased energy limit Range: 0 kW to 100000 kW | The grid-supply limit specifies the maximum power that may be drawn from the utility grid. When this power is exceeded, the energy required is drawn from the battery.
|
SOC limiting value Range: 0% to 100% | By entering a SOC (state of charge of the battery) limiting value, the total storage capacity of the battery system can be divided:
If the value 40% is entered, for example, 60% of the battery charge can be used at times when the currently generated solar power is insufficient for the required electricity supply; a base of 40% is reserved for shaving current peaks. |
Adaptive increase of the grid-supply limit | When activating, you choose to automatically adjust the purchased energy limit indicated above to the new maximum value if the grid-supply limit could not be met, e.g. due to insufficient battery charge (see above). |
Automatic reset and starting point | If the option Adaptive increase of the purchased energy limit was selected, you can specify that the grid-supply limit be reset to the value originally entered manually for the grid-supply limit after a certain (accounting) period. |
Prerequisite:
Your system must have at least 1 battery-storage system, i.e. it must have at least 1 battery inverter or 1 hybrid inverter.
The following inverters support this function:Sunny Boy Storage, all power classes
Sunny Island of the type SIxxM-12, SIxxH-12, SIxxM-13 und SIxxH-13
Sunny Tripower Smart Energy, all power classes
The listed devices support peak load shaving. This does not apply to all systems with SMA battery or hybrid inverter (see technical information "SMA SMART HOME - Compatibility list for the Sunny Home Manager 2.0").
Procedure:
- In the Configuration > System properties menu, click on the Parameter tab.
- Click on Edit.
- In the Peak load shaving area, click on Yes.
- Under Purchased energy limit enter the required power in kW that you want to draw from the utility grid at a maximum.
- As a SOC limiting value, enter a percentage up to which the battery storage capacity should only be used for peak load shaving.
- If you want to avoid an interruption in the power supply when the battery is insufficiently charged, activate the option Adaptive increase of the purchased energy limit.
- If you have the option Adaptive increase of the purchased energy limit activated, the input mask expands and offers you the possibility to limit this option.
To set a time limit, you must activate the option Automatic reset and starting point and then select an Period from the drop-down menu as well as the starting point Begin. - Click on [Save].
- In the page and menu selection Energy balance > Day, the current purchased energy limit is displayed as a dotted blue line in the diagram Generation.