Core used components

This section is about setting up required integrations and addons that we will use in next stages.

Easy stuff first¶

Please install the following, they are not really complicated, or special to the integration, so I do no provide much guidance. You can set sell and buy templates in the Czech Energy Spot Prices Integration to have correct graphs, but the prices are manually adjusted in the pyscripts.

You do not need to setup the Solax much:

solax_charger_use_mode - set to 'Self Use Mode'
remote control setting leave alone - managed by the automations (later setup)
solax_export_control_user_limit - this will be controlled later by python script, any value is fine

Emhass¶

EMHASS

This is the only integration that we need a bit more. I will go through my setting and explain the rationale. For full explanations consult docs

EMHASS (Energy Management for Home Assistant) is an optimization tool designed for residential households. The package uses a Linear Programming approach to optimize energy usage while considering factors such as electricity prices, power generation from solar panels, and energy storage from batteries. EMHASS provides a high degree of configurability, making it easy to integrate with Home Assistant and other smart home systems. Whether you have solar panels, energy storage, or just a controllable load, EMHASS can provide an optimized daily schedule for your devices, allowing you to save money and minimize your environmental impact.

Emhass will provide us the plan for the the next day. It will use machine learning / statistics to find the energy consumption and will optimize the usage to maximize the profit.

Let's setup the values.

Local¶

This is quite straightforward.

Costfun will be profit.
sensor_power_photovoltaics is probably solaxpvpower_total
sensor_power_photovoltaics_forecast is the sensor from your weather forecast, for me sensor.energyproductiontoday_2
sensor_power_load_no_var_loads this needs to be without variable loads, i do not have them, so sensor.solaxhouseload
turn on continual_publish
logging level to DEBUG

System¶

optimization_time_step - leave this at 30. I tried 15 minutes, but did not manage to get it working due the forecaster
historic_days_to_retrieve - set to the maximum days you have available in HA or 1 year
method_ts_round - first
load_forecast_method - mlforecaster, i do not have enough data to use typical.
weather_forecast_method - csv, i do not think that this is important, we will anyway pass the data via the rest call.
maximum_power_from_grid - i have the default there
maximum_power_to_grid - depends on the size of your battery, for ideal lifespan it should be ~ 0.2 of capacity. for 11.6 kWh battery, I have it on 3000

Tariff¶

load_cost_forecast_method - csv, i do not think that this is important, we will anyway pass the data via the rest call.
production_price_forecast_method - csv, i do not think that this is important, we will anyway pass the data via the rest call.

Deferable loads¶

I am not using this

Solar System¶

Turn on this section, but no adjustments are needed

Battery¶

weight_battery_discharge - this is quite important to set, each kWh stored to battery has cost, I recommend 1.5 for the default solax batteries.
battery_discharge_power_max - again same as the maximumpowerto_grid
battery_charge_power_max - set the same value here, in practise it will anyway take the max from the solar.
battery_discharge_efficiency - 0.95
battery_nominal_energy_capacity - your battery capacity in Wh
battery_minimum_state_of_charge - 0.2 - minimum 20 %, do not set lower, the automation is not perfect and better to keep extra power
battery_maximum_state_of_charge - 0.9 - maximum 90 %, it will probably go to 100% anyway.
battery_target_state_of_charge - 0.7 - the battery capacity at end of day, we will override this from the rest api call based on the next day forecasted power.

Configuration.yaml after this stage¶

This is how your configuration.yaml should look like after this stage:

# Loads default set of integrations. Do not remove.
default_config:

# Load frontend themes from the themes folder
frontend:
  themes: !include_dir_merge_named themes

# Allow home assistant to keep more data
recorder:
  purge_keep_days: 100

http:
  use_x_forwarded_for: true
  trusted_proxies:
    # this is for both Cloudflared and EMHASS
    - 172.30.33.0/24

# let's enable this later
# automation: !include_dir_list automations
# script: !include scripts.yaml
# scene: !include scenes.yaml

# setting for the pyscript
pyscript:
  allow_all_imports: true
  hass_is_global: true

logger:
  default: info
  logs:
    custom_components.pyscript: debug

# We will use this later in the automations.
shell_command:
  publish_data: "curl -i -H \"Content-Type:application/json\" -X POST -d '{}' http://localhost:5000/action/publish-data"