# Power Flow Card Plus Fix - Energy Flow Display Correction ✓ SOLVED

## Problem Summary

The Power Flow Card Plus was incorrectly showing that all solar production was consumed by home, with no grid feed-in displayed. In reality, the system was feeding excess solar back to the grid.

**Root Cause**: Wrong entity used for grid "Production" - was using cumulative energy sensor (kWh) instead of instantaneous power sensor (W).

## What Changed

### OLD Configuration (Working)
```yaml
grid:
  entity:
    consumption: "sensor.tagstromverbrauch_momentan"  # Grid consumption
    production: "sensor.tagstromverbrauch"             # Grid feed-in
home:
  use_metadata: true  # Card auto-calculates: Solar + Grid = Home
```

### NEW Configuration (Broken)
```yaml
grid:
  entity: "sensor.grid_verbrauch_gesamt"  # Combined, consumption-only
home:
  use_metadata: true  # Can't calculate properly without grid feed-in data
```

## ✅ SOLUTION (User Found & Verified Working)

**Use separated grid entities with correct sensors:**
- **Consumption**: `sensor.grid_verbrauch_gesamt` (Tag + Nacht combined in W)
- **Production**: `sensor.tagstromverbrauch` (instantaneous power in W)

**Key**: Must use `tagstromverbrauch` (power), NOT `tagstromverbrauch_ausgehend` (cumulative energy)!

### Why This Works

1. **Includes both circuits**: `grid_verbrauch_gesamt` combines Tagstrom + Nachtstrom (LOGAREX)
2. **Correct unit**: `tagstromverbrauch` is instantaneous power (W), not cumulative energy (kWh)
3. **Proper energy flow calculation**: Card can now calculate: Home = Solar - Grid_Feed_in
4. **Verified working**: Display shows Solar 3.1 kW → Home 317W, Grid -2.8 kW feed-in ✓

## ✅ Implementation (Already Done by User)

### Configuration via Home Assistant UI

**Power Flow Card Plus → Grid Section:**

1. Expand "Separated Entities" section
2. **Consumption**: Select `Grid Verbrauch Gesamt`
3. **Production**: Select `Tagstromverbrauch` (NOT `Tagstromverbrauch_ausgehend`!)

**Result in `/config/.storage/lovelace`:**
```json
"grid": {
  "display_state": "one_way",
  "entity": {
    "consumption": "sensor.grid_verbrauch_gesamt",
    "production": "sensor.tagstromverbrauch"
  },
  "invert_state": false,
  "use_metadata": false,
  "secondary_info": {}
}
```

### No Additional Steps Required

The card calculates home consumption automatically with `use_metadata: true`:
```
Home = Solar - Grid_Production + Grid_Consumption
     = 3.1 kW - 2.8 kW + 0 kW
     = 0.3 kW (300W) ≈ 317W shown ✓
```

## Critical Files

- **Power Flow Card Config**: `/config/.storage/lovelace` (SSH: icke@172.20.70.10)
- **Template Sensors**: `/config/configuration.yaml`
- **Git Repository**: `/config/.git/` (use `sudo git` for commands)

## ✅ Verified Behavior (Working)

**Current Display (from user screenshot):**
- **Solar**: 3.1 kW production
- **Grid**: -2.8 kW (negative = feeding to grid)
- **Home**: 317 W consumption
- **Energy flows**: Solar→Home (small line), Solar→Grid (large line)

**Calculation verification:**
```
Solar production: 3.1 kW
Home consumption: 0.317 kW
Excess to grid: 3.1 - 0.317 = 2.783 kW ≈ 2.8 kW ✓
```

## ✅ Verification Complete

User confirmed working configuration:
- ✅ Solar production displays correctly (3.1 kW)
- ✅ Grid shows negative value when feeding in (-2.8 kW)
- ✅ Home consumption realistic (317 W, not 3.1 kW)
- ✅ Energy flow arrows display correctly

## Recommended Git Commit

Document this fix in git:

```bash
ssh icke@172.20.70.10
cd /config
sudo git add .storage/lovelace
sudo git commit -m "Fix: Power Flow Card Plus - Use correct sensors for grid consumption/production

Grid configuration:
- Consumption: sensor.grid_verbrauch_gesamt (Tag + Nacht combined, W)
- Production: sensor.tagstromverbrauch (instantaneous power, W)

Previous issue: Used tagstromverbrauch_ausgehend (cumulative kWh) which showed
as 38,550 kW instead of actual feed-in power.

Verified working: Solar 3.1kW → Home 317W, Grid feed-in -2.8kW

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>"
```

## Key Lesson Learned

**The Problem Was NOT Missing Home Entity**

The user initially thought: "we need to add some entity in the home section"

**Actual problem**: Grid "Production" was using wrong sensor type:
- ❌ `tagstromverbrauch_ausgehend` - cumulative energy (kWh) - totals 38,550!
- ✅ `tagstromverbrauch` - instantaneous power (W) - shows ~2.8 kW

The card needs **instantaneous power (W)** for both consumption and production to calculate energy flows correctly.

## Summary for Documentation

**Problem**: Power Flow Card showing all solar going to home (incorrect)

**Root Cause**: Grid production entity was cumulative energy (kWh) instead of instantaneous power (W)

**Solution**:
```
Grid → Separated Entities:
  Consumption: sensor.grid_verbrauch_gesamt
  Production: sensor.tagstromverbrauch (NOT tagstromverbrauch_ausgehend)
```

**Result**: Correct display showing solar → home (small) + solar → grid feed-in (large) ✓

## Sources

- [Power Flow Card Plus GitHub](https://github.com/flixlix/power-flow-card-plus)
- [Home Assistant Community - How does Power Flow Card Plus calculate home consumption](https://community.home-assistant.io/t/how-does-the-power-flow-card-plus-calculate-home-energy-consumption/721252)