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README.md

@@ -50,6 +50,22 @@ Register addresses were validated by probing a SE10K-RWB48BFN4 (fw 0004.0025.001
 with one battery and one meter. Blocks that fail to read (flaky gateway) are
 skipped for that cycle; the fields are simply absent from the point.
 
+### Grafana dashboard
+
+Import `grafana_dashboard.json` (Dashboards -> New -> Import). Select your
+InfluxDB datasource when prompted (e.g. `InfluxDB-HJK`); the `$serial` variable
+is filled from the `serialnumber` tag. InfluxQL only, InfluxDB 1.x.
+
+The daemon also writes derived flow fields (`house_load`, `grid_import`,
+`grid_export`, `battery_charge`, `battery_discharge`, `solar_to_house`) so the
+dashboard's consumption-source panels are plain `mean()`/`integral()` queries.
+
+**Sign calibration:** `meter1_power` positive = import and `battery1_power`
+positive = discharge are assumptions observed once; verify on the first sunny
+day (export while surplus / charge while battery fills). If inverted, flip
+`METER_IMPORT_POSITIVE` / `BATTERY_DISCHARGE_POSITIVE` in
+`solaredge_modbus_mqtt/__init__.py` and restart - all derived fields follow.
+
 
 ### Uninstall