So I have solar panels and a Enphase Envoy-S-Standard-EU, and a energy contract with Tibber, thus variable energy rates.
Sometimes the energy rate is negative, and that typically happens when there is a lot of wind and lot or sun.
At this time I wish to completely stop producing energy with my solar panels. I’ve contact Enphase for this, and support of Enphase recommend a up sale. I had to get a Envoy metered, a 400-500 euro upgrade. That all sounded a bit silly to me, and I started to post my question on the Enphase forums;
It took me a long time to figure out, but it’s possible to temporary stop your solar panels with this setup like so;
On the digital port of the Enphase is a resistor, if you disconnect this resistor, production will halt completely.
If you connect a relay to the resistor like so;
You can control it with the relay. I bought this relay; https://www.tindie.com/products/a_lab_technology/zigbee-4-channel-relay/ Because I didn’t want another adapter, you can connect it with 220v, and it’s zigbee and has total of 4 relay’s, which can be used for other purposes.
It will all end up looking like this;
And a simple automation to switch when the price is negative;
alias: Turn off solar production when energy price is negative
description: Turn off solar production when energy price is negative
trigger:
- platform: state
entity_id:
- sensor.electricity_price_tibber
condition: []
action:
- if:
- condition: numeric_state
entity_id: sensor.electricity_price_tibber
below: 0
then:
- type: turn_on
device_id: 823e72a517eb4aa6468ca
entity_id: b3a06ead7db486952a330
domain: light
- service: notify.notify
metadata: {}
data:
message: >-
Energy price is negative
title: Energy price is negative
else:
- type: turn_off
device_id: 823e72a517eb4aa6468ca
entity_id: b3a06ead7db486952a330
domain: light
mode: single
With an other automation I make sure my heat pump is on ‘Forced On’ heating my boiler to 60 degrees.
Hope this will help others!
