# FNN-Steuerbox via GPIO (§ 14a EnWG, § 9 EEG)

Source: https://docs.evcc.io/en/external-limit/fnn-steuerbox-via-gpio-ss-14a-enwg-ss-9-eeg

## Parameters

| Name | Description | Default / example | |
| --- | --- | --- | --- |
| maxconsumptionpower | Guaranteed minimum power (Pmin) Power limit applied to the root circuit while the limit is active. |  W |  |
| w4pin | W4 GPIO pin Input pin for the W4 signal (Dimmer for controllable loads) |  |  |
| w3pin | W3 GPIO pin Input pin for the W3 signal (Zero export, 0%) |  |  |
| productionnominalmax | Installed generator power Rated generator/module power of the installation (reference value according to § 9 EEG). |  Wp |  |
| s1pin | S1 GPIO pin Input pin for the S1 signal (60% export power limit) |  |  |
| s2pin | S2 GPIO pin Input pin for the S2 signal (30% export power limit) |  |  |

## Configuration example for evcc.yaml

```yaml
hems:
  type: template
  template: fnn-gpio
  maxconsumptionpower: # Guaranteed minimum power (Pmin) (W), Power limit applied to the root circuit while the limit is active.
  w4pin: # W4 GPIO pin, Input pin for the W4 signal (Dimmer for controllable loads)
  w3pin: # W3 GPIO pin, Input pin for the W3 signal (Zero export, 0%)
  productionnominalmax: # Installed generator power (Wp), Rated generator/module power of the installation (reference value according to § 9 EEG). (optional)
  s1pin: # S1 GPIO pin, Input pin for the S1 signal (60% export power limit) (optional)
  s2pin: # S2 GPIO pin, Input pin for the S2 signal (30% export power limit) (optional)
```