Batterie-SOC KNX-Automation: Lastabwurf, Nachtladung und Tarifplanung

Logik für nächtliches Laden außerhalb der Spitzenzeiten

KNX time-based trigger (IP-Symcon or HA schedule):
  Trigger time: 01:00 local time
  Condition: GA 9/1/0 (Battery SOC) < 40%
             AND KNX tariff GA 9/9/1 < 10 (price < 0.10 €/kWh)

Action: Set MultiPlus to forced battery charge mode
  Victron (via Cerbo GX Modbus write):
    Write 4 to register 37 (unit ID 227) → force bulk charge
  Fronius GEN24 (via webserver API or EVCC):
    evcc.yaml: scheduled charging at 01:00 with "now" mode

KNX tariff GA update (source: HA automation reading Tibber API):
  HA script (runs at 22:00 daily):
    GET https://api.tibber.com/v1-beta/gql (Tibber price API)
    Find minimum price in next 8 hours
    Write min_price × 100 (integer cents) to GA 9/9/1

  GA 9/9/1 = current electricity price in euro cents (DPT 9.002)
  GA 9/9/2 = off-peak start hour (DPT 5.010)

Cancel condition: 06:00 OR GA 9/1/0 > 90%
  → Stop forced charge → return to normal ESS mode

Morgendliche Vorladungsautomatisierung (IP-Symcon-Skript)

// IP-Symcon PHP script — runs at 06:00 daily
$soc = GetValueFloat(IPS_GetVariableIDByName("Battery SOC", $parentID));
$pvForecast = GetValueFloat($pvForecastVariableID); // from PV forecast API

// PV forecast integration: HA reads forecast.solar API
// GET https://api.forecast.solar/estimate/<lat>/<lon>/<dec>/<az>/<kwp>
// Forecast for today: energy in kWh — high forecast means skip pre-charge

if ($soc < 30 && $pvForecast < 15) {
  // Low SOC and low solar forecast — pre-charge to 50% before peak
  SetValueInteger($multiPlusMode, 4); // Force bulk charge
  IPS_RunScriptEx($chargeStopScript, ["targetSOC" => 50]);
}

// In HA automation:
automation:
  - alias: "Morning pre-charge if low SOC"
    trigger:
      - platform: time
        at: "06:00:00"
    condition:
      - condition: numeric_state
        entity_id: sensor.battery_soc
        below: 30
      - condition: template
        value_template: "{{ states('sensor.pv_forecast_today_kwh')|float < 15 }}"
    action:
      - service: script.force_battery_charge_to_50_percent

HA Tibber → KNX-Tarif-GA-Automatisierung

# HA configuration.yaml — Tibber integration
tibber:
  access_token: !secret tibber_access_token

# sensor: current electricity price in EUR/kWh
sensor:
  - platform: tibber
    name: tibber_current_price

# automation: write current price to KNX GA every hour
automation:
  - alias: "Tibber price → KNX tariff GA"
    trigger:
      - platform: time_pattern
        minutes: "0"    # Run at :00 of every hour
    action:
      - service: knx.send
        data:
          address: "9/9/1"
          payload: >
            {{ (states('sensor.tibber_current_price')|float * 1000)|int }}
          # Scale: multiply by 1000 to get milli-EUR (DPT 9.002 compatible)
          type: "2byte_float"

# KNX logic uses GA 9/9/1 value:
#   < 100 (0.10 EUR/kWh): trigger off-peak battery charge
#   > 300 (0.30 EUR/kWh): enable all self-consumption loads aggressively
#   > 500 (0.50 EUR/kWh): emergency: maximise battery discharge, no grid import

SOC-Automatisierungs-Inbetriebnahmetestszenarien

Prerequisite: disconnect real battery SOC input to KNX
  (remove Intesis IN701KNX poll for register 843 temporarily)
  → manually write SOC test values to GA 9/1/0 via ETS6

Test 1 — Normal operation (SOC 75%):
  Write 75 to GA 9/1/0
  Expected: no load shedding, self-consumption logic active
  Verify: EV and SG Ready loads enabled (if surplus present)

Test 2 — Enter low SOC zone (SOC 18%):
  Write 18 to GA 9/1/0
  Expected: after 60s on-delay, soc_critical flag sets
  Verify: GA 10/0/1 (EV enable) → 0 (EV disabled)
          SG Ready relays → State 2 (both contacts open)

Test 3 — Hysteresis: recovery insufficient (SOC 22%):
  Write 22 to GA 9/1/0 (above 20% threshold but below 25% recovery)
  Expected: soc_critical flag remains set (hysteresis holds)
  Verify: loads remain disabled — confirm hysteresis working

Test 4 — Hysteresis: recovery sufficient (SOC 27%):
  Write 27 to GA 9/1/0 (above 25% recovery threshold)
  Expected: soc_critical flag clears after 60s
  Verify: loads re-enable (if surplus still present)

Test 5 — Emergency zone (SOC 8%):
  Write 8 to GA 9/1/0
  Expected: HVAC setback scene activates (HVAC −2°C)
            Alarm GA 9/9/0 → 1 (alert fires in Gira X1)
  Verify in HVAC setpoint display: temperature reduced by 2°C

Test 6 — Off-peak charging trigger:
  Write 35 to GA 9/1/0 (SOC 35% — below 40% threshold)
  Set time to 01:05 (test time via IP-Symcon or HA test trigger)
  Write 8 to GA 9/9/1 (price 0.008 EUR/kWh — very cheap)
  Expected: forced battery charge mode activates
  Verify: MultiPlus/GEN24 starts charging from grid