Feature Idea: Allow Peak Shaving to Override Excluded Devices (Capacity Tariff Support)

[Prestodus]

📝 Describe the feature

I would like to suggest a new setting that bridges the gap between Excluded Devices and Peak Shaving, specifically to support capacity-based grid pricing models (like the "capaciteitstarief" in Belgium).

Currently, these two features operate in silos. When high-consumption devices (like EV chargers, heat pumps, or electric heaters) are added to Excluded Devices so they don't needlessly drain the home battery, they become completely invisible to the Peak Shaving logic. This results in massive grid spikes, ruining the monthly peak capacity limit that the Peak Shaving feature is supposed to protect. Please correct me if I'm wrong.

Example Scenario:

• Solar import: 0W
• Peak limit: 3000W
• Home consumption (standard): 1000W
• Sum of excluded devices: 4000W
• Cover Home setting: ON

Current Behavior:
Because Cover Home is ON, the battery supplies the 1000W for the standard home load. However, the grid is directly powering the excluded devices at 4000W. Because the peak shaving logic ignores excluded devices, the grid draw sits at 4000w, breaching the 3000W peak limit by 1000W.

Desired Behavior:
The system recognizes that the total grid draw (4000W) exceeds the peak limit (3000W) by 1000W. The battery steps in to cover the difference.
The battery now outputs a total of 2000W:

• 1000W to cover the standard home usage (Cover Home).
• 1000W as an additional peak shaving measure to suppress the excluded devices' grid draw.
• Result: The grid power draw remains perfectly capped at the 3000W level.

💡 Proposed Solution

Introduce a new toggle setting, perhaps named "Peak Shaving Overrides Exclusion", located under the Peak Shaving or Excluded Devices configuration.

• Behavior when OFF (Default): The current system behavior remains intact. Excluded devices are completely ignored by the peak shaving threshold.
• Behavior when ON: The system monitors the raw total grid import. If the total grid import (including the load from excluded devices) exceeds the configured Peak limit, the battery steps in to discharge the difference. The battery effectively acts as a strict emergency ceiling for the entire home, regardless of exclusions.

⚙️ Technical Considerations & Edge Cases

If implemented, there are a couple of edge cases to keep in mind:

• Inverter Output Limits: A cluster of excluded devices can easily pull 11 kW or more, while a typical home battery inverter might max out at 5 kW. If the required peak shaving draw exceeds the inverter's maximum output, the logic needs to gracefully handle maxing out the inverter's discharge rate without throwing errors or looping.
• [Nice to Have] Minimum SOC Offset for Override: Since the standard Peak Shaving feature already has a minimum SOC limit, shaving a massive peak for excluded devices could race the battery down to that limit very rapidly. As a "nice to have," this override could include an Offset to Minimum SOC parameter (e.g., +0% to 25%). For example, if the standard Peak Shaving Min SOC is 20%, an offset of +15% would stop the battery from covering excluded devices once it drops to 35%, preserving the remaining capacity for standard home peak shaving.

🎯 Use Case Context

For users in regions with capacity tariffs, preventing sudden, high grid imports is financially critical. This feature would allow us to prioritize heavy consumers directly from the grid (by excluding them), while still maintaining a hard "safety net" limit on our total grid draw to avoid heavy utility penalties.

[github-actions[bot]]

Thanks for the suggestion! 🙌

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[ffunes]

Thanks for the detailed suggestion.
Peak shaving already overrides excluded devices while it is active—that is, when the average battery SOC is below the configured peak-shaving SOC threshold. In your example, the controller should see the full 5,000 W load and command 2,000 W from the battery, keeping grid import at 3,000 W.
However, I found a real gap in the current behaviour: when SOC is at or above that threshold, peak shaving is inactive. An excluded 4,000 W load can therefore exceed the grid limit even though the battery has sufficient capacity.
Could you confirm the battery SOC and your configured peak-shaving SOC threshold when you observed this?
If the SOC was above the threshold, I would treat this as a distinct feature: an optional hard grid-import ceiling that remains active independently of the normal peak-shaving conservation mode. The existing inverter power limits would still be respected. A separate SOC reserve for this override could also be considered, although that would require additional control logic.

[Prestodus]

Thank you for your reply. Yes, what you mention as the gap is exactly what I mean, an option to respect the peak limit even when the system is not in active peak shaving mode (below the SOC threshold) WITH active excluded devices. This minimizes the risk of e.g. an excluded granny charger raising the monthly peak, and thus raising the capacity tariff.

[ffunes]

Hi,

This will be available in 1.2.0.

Best regards

[Prestodus]

Perfect, looking forward to try it out. Thank you.

[ffunes]

Hi,

1.2.0b1 is out. Please test it and provide feedback on the new functionality.

Best regards

[Prestodus]

I'm afraid I can't find a new setting in the peak shaving category.

[ffunes]

Did you have the app open? Close it and open it again so the dashboard refreshes.

[Prestodus]

I did a frontend refresh but that didn't seem to work. An app cache clearing did the trick. It might be a while until I get a chance to test the feature though.