Phase 4: Smart grid / energy tariff support (SG-Ready)

[liudger]

Phase 4: Smart Grid / Energy Tariff Support

Priority: 🔵 Low
Scope: Library + HA integration
Depends on: Phase 2 (#1374)
Parent: #1371

Goal

Enable smart grid integration allowing the heating system to respond to energy tariffs (cheap/expensive electricity) via BSB-LAN's SG-Ready interface. This is increasingly relevant as more users combine heat pumps with solar PV and dynamic electricity tariffs.

Background

BSB-LAN supports the SG-Ready (Smart Grid Ready) interface, which is a German standard for heat pump demand response. It allows external systems to signal the heat pump to:

• Block: Stop heating (grid overload)
• Normal: Standard operation
• Boost: Increase setpoints (cheap energy / solar surplus)
• Max boost: Force maximum heating (very cheap energy)

New Parameters

Param ID	Name	Unit	Description
3264	smart_grid_mode	enum	Current SG-Ready mode (0-3)
3265	smart_grid_status	enum	Smart grid status feedback
3266	smart_grid_boost_setpoint_offset	K	Temperature boost offset
3267	smart_grid_dhw_boost_setpoint	°C	DHW boost setpoint

SG-Ready Modes

Mode	Signal	Heat Pump Behavior
0	Block	Compressor off (grid overload)
1	Normal	Standard operation
2	Boost	Increased setpoints (cheap tariff / solar)
3	Max boost	Forced maximum output

Tasks

Library (python-bsblan)

• Add smart grid params to constants.py
• Create SmartGrid model in models.py
• Add smart_grid() method to read status
• Add set_smart_grid() method to write mode
• Add enum mapping for SG-Ready modes
• Add tests and fixtures
• Run uv run prek run --all-files

HA Integration

• Expose smart_grid_mode as a select entity (Block / Normal / Boost / Max Boost)
• Expose smart_grid_status as a sensor entity
• Create automation blueprints for common scenarios:
  • Solar surplus → Boost mode
  • Cheap tariff hours → Boost mode
  • Grid overload signal → Block mode
• Add tests

Acceptance Criteria

• Users can read current smart grid mode and status
• Users can set smart grid mode from HA (select entity or service call)
• Automations can control heat pump based on energy tariff / solar production
• Gracefully handles devices without SG-Ready support (param validation skips)

Future Ideas

• Integration with HA energy dashboard tariff tracking
• Automatic switching based on Nordpool / Tibber / ENTSO-E prices
• Solar surplus detection via HA energy sensors

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