Register 178: write the 2-bit fields, confirmed against the inverter

A read-only probe of the settings block returned 178 = 0x2ABA, which is a
valid Deye code (10 = disable, 11 = enable) in every 2-bit field, matching the
three-phase protocol V105.1 and the ha-solarman and sunsynk maps. Reading the
same word as single bits 4/8/12/15 would have pointed the peak-shaving and DRM
switches at the neighbouring external-relay and grounding-fault fields.

The probe also confirmed 336 (parallel / master-slave / Modbus SN) and 347
(CT ratio), so the diagnostic guesses at 225 and 315 are dropped.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: rusty-bit

CHANGELOG.md

@@ -7,14 +7,20 @@
 - Confirmed correct: zero export power (104), work mode (142), max sell power (143),
   solar sell (145), time of use (146), TOU blocks (148-177), grid voltage/frequency
   protection (185-188), peak-shaving power (190/191), lithium/BMS type (223).
-- Changed: register 178 is a nibble field - generator peak-shaving is bit 4 and grid
-  peak-shaving bit 8 (was bit 2 / bit 4 from a community map).
+- Changed: register 178 holds 2-bit fields (10 = disable, 11 = enable), so each switch
+  writes the whole pair: generator peak-shaving bits 2-3, grid peak-shaving 4-5, on-grid
+  always on 6-7, DRM 12-13. Verified by reading this inverter: 178 = 0x2ABA, a valid code
+  in every pair. (An earlier draft read them as single bits 4/8/12/15, which would have
+  written the neighbouring external-relay and grounding-fault fields instead.)
 - New: Activate Battery (112, inverted logic), Generator Force On (132), Generator minimum
   solar power (139), ARC fault detection (181), generator connected to grid input (189),
-  SmartLoad open delay (192), DRM (178 bit 15), on-grid always on (178 bit 12).
+  SmartLoad open delay (192), DRM (178 bits 12-13), on-grid always on (178 bits 6-7).
 - New diagnostic sensors (read-only, disabled by default) for registers whose mapping is
-  still unproven: 140, 178, 209, 224, 225, 228, 315, 341. Enable them and compare against
-  Deye Cloud before making them writable.
+  still unproven: 140, 178, 209, 224, 228, 341.
+- Confirmed by a read-only probe of this inverter: 336 holds parallel / master-slave /
+  Modbus SN (0x0400 = parallel off, slave, SN 1) and 347 the CT ratio (2000), so the
+  guesses at 225 and 315 are dropped. 345 reads 0 while Deye Cloud shows "Eastron", so
+  Meter Select stays unconfirmed.
 
 ## 0.1.5
 - Entity ranges taken from the inverter's own "Export All Configurations" (SN 2512153227):

custom_components/deye_modbus/maps/sun_3ph_hybrid.yaml

@@ -852,6 +852,8 @@ sensors:
     icon: mdi:meter-electric
     enabled_default: false
 
+  # Reads 0 on this inverter although Deye Cloud shows "Eastron" - the meter
+  # maker may live in another register on this firmware.
   - name: Meter Select
     unique_id: adv_meter_select
     register_type: holding
@@ -887,8 +889,12 @@ sensors:
   # ----------------------------------------------------- unverified registers
   # Raw values, read-only, disabled by default. Enable them and compare with
   # "Export All Configurations" in Deye Cloud before they are made writable.
-  # Expected on this system: CT ratio 2000, Modbus SN 1, backup delay 0,
-  # meter = Eastron, and register 178 with the grid peak-shaving bit set.
+  # Checked against this inverter (192.168.178.199) on 2026-09-20:
+  #   178 = 0x2ABA - every 2-bit field a valid Deye code, grid peak-shaving on
+  #   209 = 0 (backup delay), 336 = 0x0400 (parallel off, slave, Modbus SN 1),
+  #   341 bit 2 set (MPPT scan on), 347 = 2000 (CT ratio) - all as expected.
+  #   225 and 315 were guesses and read 0xF002 / 0x06A4, so they are dropped.
+  #   345 (meter maker) reads 0 although Deye Cloud shows Eastron - unconfirmed.
   - name: Raw 178 (peak-shaving / DRM bits)
     unique_id: raw_178_flags
     register_type: holding
@@ -921,14 +927,6 @@ sensors:
     entity_category: diagnostic
     enabled_default: false
 
-  - name: Raw 225 (CT ratio?)
-    unique_id: raw_225_ct_ratio
-    register_type: holding
-    address: 225
-    count: 1
-    entity_category: diagnostic
-    enabled_default: false
-
   - name: Raw 228 (beep / AM-PM / auto dim?)
     unique_id: raw_228_display
     register_type: holding
@@ -937,14 +935,6 @@ sensors:
     entity_category: diagnostic
     enabled_default: false
 
-  - name: Raw 315 (parallel / master-slave / modbus SN?)
-    unique_id: raw_315_parallel
-    register_type: holding
-    address: 315
-    count: 1
-    entity_category: diagnostic
-    enabled_default: false
-
   - name: Raw 341 (MPPT scan?)
     unique_id: raw_341_mppt_scan
     register_type: holding
@@ -1904,7 +1894,9 @@ controls:
     group: Advanced Function
     register_type: holding
     address: 178
-    bit: 8
+    mask: 0x0030
+    on_value: 3
+    off_value: 2
     icon: mdi:transmission-tower
     entity_category: config
 
@@ -1928,7 +1920,9 @@ controls:
     group: Advanced Function
     register_type: holding
     address: 178
-    bit: 4
+    mask: 0x000C
+    on_value: 3
+    off_value: 2
     read_unique_id: rb_grid_peak_shaving_enable
     icon: mdi:engine
     entity_category: config
@@ -2087,7 +2081,9 @@ controls:
     group: Advanced Function
     register_type: holding
     address: 178
-    bit: 15
+    mask: 0x3000
+    on_value: 3
+    off_value: 2
     read_unique_id: rb_grid_peak_shaving_enable
     icon: mdi:radio-tower
     entity_category: config
@@ -2099,7 +2095,9 @@ controls:
     group: Advanced Function
     register_type: holding
     address: 178
-    bit: 12
+    mask: 0x00C0
+    on_value: 3
+    off_value: 2
     read_unique_id: rb_grid_peak_shaving_enable
     icon: mdi:transmission-tower
     entity_category: config