updates to evse

LVX6048/homeassistant/README.md

@@ -11,6 +11,7 @@ Mirrors the `eg4battery/homeassistant/` pattern.
 | File                       | Where it goes in HA                                          |
 |----------------------------|--------------------------------------------------------------|
 | `mqtt_controls.yaml`       | `configuration.yaml` → `mqtt: !include lvx6048/mqtt_controls.yaml` (or merge by hand) |
+| `template_sensors.yaml`    | `configuration.yaml` → `template: !include lvx6048/template_sensors.yaml` |
 | `lovelace_controls.yaml`   | Raw Lovelace card config — paste into a new dashboard view   |
 
 The auto-discovery sensors (battery V, fault code, mode, MPPT power, …)
@@ -20,6 +21,10 @@ This folder only adds the pieces HA can't infer:
 - **Control entities** — selects + numbers that publish to
   `solar/control/lvx6048/<action>` so users can change settings from a
   dashboard without touching the LCD.
+- **Stack-total derived sensors** — the PI18 GS command only exposes per-unit
+  numbers, so a 240 V load split across two LVX6048s shows as ~half on each.
+  `template_sensors.yaml` synthesizes household-level totals (apparent_power,
+  active_power, mppt1_input_power).
 - **A dashboard view** that wraps those controls with the existing
   telemetry into one screen.