feat(inverter): add LuxPower LXP family + rebrand drivers

- lxp_6k: LuxPower LXP 6K (SNA-US 6000 platform, 2-MPPT single-phase)
- lxp_12k / lxp_18k: LuxPower LXP 12K/18K (18KPV platform, 3-MPPT split-phase)
- fortress_envy_12k: Fortress Envy True 12K (rebadged LXP 12K)
- bigbattery_sna_6k: BigBattery SNA-US 6K (rebadged SNA-US 6000)

All are aliases of the two existing validated families (luxpower_sna and
eg4_18kpv) — the LuxPower/EG4 protocol is model-agnostic with runtime model
detection via hold registers 7-8 + register 16 (DTC). No new register map
needed; PV string count is handled at runtime via hold register 20.

Source: docs/reference/luxpower-ha-register-map.md

Author: jmewing

collector/drivers/bigbattery_sna_6k.py

@@ -0,0 +1,18 @@
+"""BigBattery SNA-US 6K inverter driver.
+
+The BigBattery SNA-US 6K is a rebadged LuxPower SNA-US 6000 (2-MPPT,
+single-phase off-grid), sold as-is under the BigBattery brand. It shares the
+exact same register map as the EG4 6000XP. This driver is an alias of the
+canonical `luxpower_sna` driver.
+"""
+from __future__ import annotations
+
+from . import ModelDriver
+from .luxpower_sna import create_driver as _sna
+
+
+def create_driver() -> ModelDriver:
+    drv = _sna()
+    drv.name = "bigbattery_sna_6k"
+    drv.label = "BigBattery SNA-US 6K"
+    return drv

collector/drivers/fortress_envy_12k.py

@@ -0,0 +1,18 @@
+"""Fortress Power Envy True 12K inverter driver.
+
+The Fortress Power Envy True 12K (formerly "Envy 12kW") is a rebadged
+LuxPower LXP 12K — 3-MPPT, split-phase 120/240V hybrid. It shares the exact
+same register map as the EG4 18KPV / 12kPV. This driver is an alias of the
+`eg4_18kpv` driver (document-derived, not yet capture-validated).
+"""
+from __future__ import annotations
+
+from . import ModelDriver
+from .eg4_18kpv import create_driver as _18kpv
+
+
+def create_driver() -> ModelDriver:
+    drv = _18kpv()
+    drv.name = "fortress_envy_12k"
+    drv.label = "Fortress Envy True 12K"
+    return drv

collector/drivers/lxp_12k.py

@@ -0,0 +1,18 @@
+"""LuxPower LXP 12K inverter driver.
+
+The LuxPower LXP 12K is the OEM's own branding of the 12 kW hybrid platform
+(3-MPPT, split-phase 120/240V, AFCI, generator input). It shares the exact
+same register map as the EG4 18KPV / 12kPV. This driver is an alias of the
+`eg4_18kpv` driver (document-derived, not yet capture-validated).
+"""
+from __future__ import annotations
+
+from . import ModelDriver
+from .eg4_18kpv import create_driver as _18kpv
+
+
+def create_driver() -> ModelDriver:
+    drv = _18kpv()
+    drv.name = "lxp_12k"
+    drv.label = "LuxPower LXP 12K"
+    return drv

collector/drivers/lxp_18k.py

@@ -0,0 +1,18 @@
+"""LuxPower LXP 18K inverter driver.
+
+The LuxPower LXP 18K is the OEM's own branding of the 18 kW hybrid platform
+(3-MPPT, split-phase 120/240V, AFCI, generator input). It shares the exact
+same register map as the EG4 18KPV. This driver is an alias of the
+`eg4_18kpv` driver (document-derived, not yet capture-validated).
+"""
+from __future__ import annotations
+
+from . import ModelDriver
+from .eg4_18kpv import create_driver as _18kpv
+
+
+def create_driver() -> ModelDriver:
+    drv = _18kpv()
+    drv.name = "lxp_18k"
+    drv.label = "LuxPower LXP 18K"
+    return drv

collector/drivers/lxp_6k.py

@@ -0,0 +1,17 @@
+"""LuxPower LXP 6K inverter driver.
+
+The LuxPower LXP 6K is the OEM's own branding of the SNA-US 6000 platform
+(2-MPPT, single-phase off-grid). It shares the exact same register map as the
+EG4 6000XP. This driver is an alias of the canonical `luxpower_sna` driver.
+"""
+from __future__ import annotations
+
+from . import ModelDriver
+from .luxpower_sna import create_driver as _sna
+
+
+def create_driver() -> ModelDriver:
+    drv = _sna()
+    drv.name = "lxp_6k"
+    drv.label = "LuxPower LXP 6K"
+    return drv

collector/drivers/registry.py

@@ -12,6 +12,11 @@
 from .eg4_6500ex import create_driver as _eg4_6500ex
 from .eg4_3000ehv import create_driver as _eg4_3000ehv
 from .luxpower_sna import create_driver as _luxpower_sna
+from .lxp_6k import create_driver as _lxp_6k
+from .lxp_12k import create_driver as _lxp_12k
+from .lxp_18k import create_driver as _lxp_18k
+from .fortress_envy_12k import create_driver as _fortress_envy_12k
+from .bigbattery_sna_6k import create_driver as _bigbattery_sna_6k
 
 logger = logging.getLogger(__name__)
 
@@ -40,6 +45,18 @@
     "eg4_18kpv": _eg4_18kpv,
     "eg4_12kpv": _eg4_12kpv,
 
+    # ── LuxPower LXP family (OEM's own branding) ──
+    # LXP 6K = SNA-US 6000 (2-MPPT single-phase); LXP 12K/18K = 18KPV
+    # platform (3-MPPT split-phase). Same shared register map.
+    "lxp_6k": _lxp_6k,
+    "lxp_12k": _lxp_12k,
+    "lxp_18k": _lxp_18k,
+
+    # ── Other LuxPower rebrands ──
+    # Fortress Envy True 12K = LXP 12K; BigBattery SNA-US 6K = SNA-US 6000.
+    "fortress_envy_12k": _fortress_envy_12k,
+    "bigbattery_sna_6k": _bigbattery_sna_6k,
+
     # ── FlexBOSS / GridBOSS ──
     # NEW platform (not a Luxpower SNA rebadge). Register map unknown; do NOT
     # alias to either family above. Intentionally absent until a dedicated

tests/test_drivers.py

@@ -15,6 +15,47 @@ def test_registry_has_sna_family():
     assert "eg4_3000ehv" in DRIVERS
 
 
+def test_registry_has_lxp_and_rebrands():
+    assert "lxp_6k" in DRIVERS
+    assert "lxp_12k" in DRIVERS
+    assert "lxp_18k" in DRIVERS
+    assert "fortress_envy_12k" in DRIVERS
+    assert "bigbattery_sna_6k" in DRIVERS
+
+
+def test_lxp_6k_is_sna_family():
+    base = get_driver("luxpower_sna")
+    d = get_driver("lxp_6k")
+    assert d.input_registers is base.input_registers
+    assert d.batches == base.batches
+    assert d.label == "LuxPower LXP 6K"
+
+
+def test_bigbattery_is_sna_family():
+    base = get_driver("luxpower_sna")
+    d = get_driver("bigbattery_sna_6k")
+    assert d.input_registers is base.input_registers
+    assert d.batches == base.batches
+    assert d.label == "BigBattery SNA-US 6K"
+
+
+def test_lxp_12k_18k_are_18kpv_family():
+    kpv = get_driver("eg4_18kpv")
+    for model, label in (("lxp_12k", "LuxPower LXP 12K"), ("lxp_18k", "LuxPower LXP 18K")):
+        d = get_driver(model)
+        assert d.input_registers is kpv.input_registers
+        assert d.batches == kpv.batches
+        assert d.label == label
+
+
+def test_fortress_envy_is_18kpv_family():
+    kpv = get_driver("eg4_18kpv")
+    d = get_driver("fortress_envy_12k")
+    assert d.input_registers is kpv.input_registers
+    assert d.batches == kpv.batches
+    assert d.label == "Fortress Envy True 12K"
+
+
 def test_sna_aliases_share_register_family():
     # 12000XP / 6500EX / 3000EHV are SNA rebadges → same map as 6000XP
     base = get_driver("eg4_6000xp")