Maturity status |  |
Supported domains | HEMS |
Overview
PV Curtailment prevents financial loss when electricity market prices for grid feed-in turn negative. When this occurs, the Energy Management System (EMS) automatically limits solar production and may shift controllable consumption to these periods. This ensures you do not "pay" to export your excess solar power.
Important
Inverter Compatibility: This feature is only available for specific inverters. Please refer to the Supported Inverter List (Table 4) below before attempting configuration.
Configuration within XENON
To enable curtailment, ensure your Energy Management settings are enabled, then follow these steps in the XENON Admin-Dashboard:
Navigate to the Overview tab of the system.
Locate the Time of Use tile.
Price-based PV Curtailment: Switch this to Active by clicking on the small gear icon and switching the toggle to On. (Note: This is only possible if your inverter is officially supported).
Inverters supporting PV curtailment
The following table highlights the supported inverters and describes the configuration per inverter OEM/mode.
Explanation of columns:
OEM: manufacturer of the inverter
Model: inverter model, model series, or multiple series (if settings are identical for mentioned series)
Configuration in OEM app/portal: description of the specific configuration to be set for the inverter
Update: last date when the information of this row is updated
Table 4. PV Curtailment inverter list
OEM | Model | Configuration via OEM app/portal | Update |
Enphase | Envoy-S + IQ7, Envoy-S + IQ8 | Not needed gridBox can directly control the inverter settings. | 04.09.2025 |
Sungrow | SHxxRT, SHxxT, SHxxRS | Not needed gridBox can directly control the inverter settings. | 28.04.2025 |
FoxESS | H3-Smart, H3-Pro | Not needed gridBox can directly control the inverter settings. | 28.04.2025 |
Kostal | Plenticore | Not needed gridBox can directly control the inverter settings. | 30.04.2025 |
Viessmann | Vitocharge VX3 | Not needed gridBox can directly control the inverter settings. | 13.06.2025 |
Known Limitations & Behavior
Users and support staff should be aware of the following technical behaviors during curtailment:
Multi-Inverter Setups: Currently not supported. Only single-inverter systems are compatible.
Reactive Control: The algorithm is reactive; occasional short feed-in spikes may occur during rapid weather changes.
SSO Interactions: When combined with Self-Sufficiency Optimization (SSO), the system may import a small amount of grid power to compensate for the curtailed PV output.
EV Charging: Phase switching (1-phase to 3-phase) may cause temporary feed-in spikes.
Forecast Uncertainty: Because PV forecasts are not 100% certain, the system may occasionally charge from the grid when solar is low or miss a surplus opportunity if the forecast was too conservative.
Zero-Export Compatibility: EV PV surplus charging may not function as expected when the system is curtailing to zero.