FoxESS Freeze Export mode predicts no battery charge, but the battery does charge

Describe the bug
Predbat expects that in Freeze Export mode all available PV generation is used either by the house load or sent to the grid. It expects that if there is more generation than is covered by load or export, it is lost/clipped.

Expected behaviour
For FoxESS (and probably other) inverters, in freeze export ("feed-in first") mode, generation above the load and export limits will be stored in the battery and will therefore increase the SoC. Predbat should plan for this.

Predbat version

v8.44.5

Environment details

Inverter and battery setup
- FoxESS KH9 inverter with 18kWh battery storage
- Connected using modbus integration
Standard HAOS installer or Docker
- HAOS install

Log file

predbat.log

Predbat debug yaml file

predbat_debug.yaml.txt

How are you controlling the Fox during an export freeze, your apps.yaml isn't attached?

Sorry, the issue template doesn't ask for apps.yaml. Here it is:

apps.yaml.txt

Inverter control is the same as the Fox template:

  # Services to control charging/discharging
  charge_start_service:
    service: select.select_option
    entity_id: select.work_mode
    option: "Force Charge"
  charge_stop_service:
    service: select.select_option
    entity_id: select.work_mode
    option: "Self Use"
  discharge_start_service:
    service: select.select_option
    entity_id: select.work_mode
    option: "Force Discharge"
  discharge_stop_service:
    service: select.select_option
    entity_id: select.work_mode
    option: "Self Use"
  discharge_freeze_service:
    service: select.select_option
    entity_id: select.work_mode
    option: "Feed-in First"
  charge_freeze_service:
    service: select.select_option
    entity_id: select.work_mode
    option: "Back-up"

Root cause found: during an export freeze, prediction.py's freeze guard unconditionally zeroed the predicted charge rate, ignoring inverter_can_charge_during_export - so on inverters that route PV surplus to the battery during a freeze (e.g. FoxESS "Feed-in First"), the plan predicted no charging while the inverter actually charged from surplus PV.

Fix (mirrored in the C++ kernel too): #4425

fix(plan): gate Freeze Export on a new inverter_can_freeze_export flag (

fix(config): FoxESS support_discharge_freeze should be False, matchin…

fix(plan): don't offer Freeze Export for inverters that always charge…

fix(plan): gate Freeze Export on a new inverter_can_freeze_export flag (

fix(config): FoxESS support_discharge_freeze should be False, matchin…

feat(prediction): model PV recapture beyond the export limit during F…

refactor(prediction): model Freeze Export as ECO with charging disabled

feat(prediction): gate Freeze Export PV recapture on a real Feed-in F…

Navigation Menu

Repository navigation

FoxESS Freeze Export mode predicts no battery charge, but the battery does charge #4207

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

FoxESS Freeze Export mode predicts no battery charge, but the battery does charge #4207

Description

Activity

springfall2008 commented on Jul 8, 2026

daviessm commented on Jul 9, 2026

chalfontchubby commented on Aug 2, 2026

Metadata

Metadata

Assignees

Labels

Projects

Milestone

Relationships

Development

Issue actions