Ess¶

• Inhoudsopgave
• Ess
• EasySolar II
  • Multiplus II
  • GX device
    • ESPhome grid meter
    • GX to Home Assistant
    • GX Venus OS Large
• Pylontech 5000US

Gathered info about the Victron Dynamic ESS algorithm

• The algorithm does consider tomorrow's prices, consumption and PV yield estimates (from the moment tomorrow's prices are published). This is not expressed visually on the graphs because Node-RED implementation is only a proof-of-concept :). But the documentation perhaps should reflect this fact to make it clear.
• It seems you have understood the reason behind why the discharge is always happening: because it is still profitable to do so since it is energy that is present in the battery. It is important to note that the algorithm only works with the future, so what happens in the past (the price at which it charged) is irrelevant because the algorithm only sees it as the available energy in the battery at a given moment.
• The partial charge that happens at 13 when the b_cost is below 0.04 is because it only considers the PV-yield as the profitable energy at that time. Looking at the buy/sell prices of the installation, it is hardly ever profitable to do energy trading using the grid since buy price is greatly higher than the sell price. But PV yield is 'free' in that way. And the reason why the charge/discharge (at 13 and evening) does not happen with prices above 0.05 is because the battery costs of that operation outweighs the earnings you would get from selling it to the grid.
• The reason why the controls do not reflect what you see on the graph is because the system is trying to be conservative with allowing the battery to be idle. Since the forecasts for both consumption and solar yield can be inaccurate and the battery costs are a factor to consider, we have seen that it is best to disallow the battery to be non-idle when its planned usage is below 10% of its charge/discharge capabilities.
• For the hours 1 and 2, the planned battery discharge was below 0.3 (10% of the FB_max) looking at the screenshot you have provided in the original post. In this case the battery is set to be idle in order to be conservative with its usage. But for the hour 3, the planned discharge was above 0.3 hence the battery was not idle (as you can see from the screenshot you posted the last) It is important to note that the decision-making with regards to this conservative usage is made based on the forecasts not what happens in reality in that hour: for hour 2 the usage was actually above 0.3 while for hour 3 it was the opposite.
• For instance, for the first installation screenshots you have provided, the reason why it charges at 11 is because it expects
  consumption of around 4 kWh in the hours after and the FG_max is 3.5 kWh, meaning there is a need for battery to meet that 1 kWh in those hours. Hence it plans to discharge till 14. After 14 it starts charging at a high rate because the prices are the lowest at that time. It continues charging till 17, to be ready to meet the consumption needs in the evening where the prices will be more expensive. And then it discharges.
  In doing these it never aims to charge fully, because that is not necessarily the most cost-effective way to go according to the algorithm. I hope this provides more context as to how the algorithm functions, if you have any more questions feel free to ask.

EasySolar II¶

ESS #1 means low SOC

Multiplus II¶

ConfigurationConfiguration

TAB: GeneralSystem frequency    50Hz

Shore current    19.0    A
Overruled by remote    checked
Dynamic current limiter    unchecked
External current sensor connected (see manual)    unchecked
State of charge when Bulk finished    95.0    %
Battery capacity    200    Ah
Charge efficiency    0.95    TAB: Grid
Country / grid code standard    Germany:             VDE-AR-N 4105:2018-11, internal NS protection

AC input 1    Above selected gridcode plus LOM B (compliant)
rise-in-voltage protection U>    253.0    V
start network service HF treshold    50.20    Hz
P(f>) droop    5.00    %
Use Aux1 as disable FeedIn signal    checked
Maximum AC current for charge or feed in    100.0    %
Reactive power regulation    Use a fixed Cos Phi
Filter time for reactive power    3.3    s
Cos phi at point 1    1.00    TAB: Inverter
PowerAssist    unchecked

Inverter output voltage    230    V
Inverter DC shut-down voltage    44.00    V
Inverter DC restart voltage    48.00    V
Low DC alarm level    48.00    V
Do not restart after short-circuit (VDE 2510-2  safety)    unchecked
enable AES    uncheckedTAB: Charger
Enable charger    checked

Weak AC input    unchecked
Stop after excessive bulk    unchecked
Lithium batteries    checked
Disable VSense (for diagnostic purposes)    unchecked
Configured for VE.Bus BMS    unchecked
Charge curve    Fixed
Absorption voltage    52.00    V
Float voltage    51.00    V
Charge current    70    A
Repeated absorption time    1.00    Hr
Repeated absorption interval    7.00    Days
Absorption time    1    HrTAB: Virtual switch
TAB: Usage
Virtual switch usage    Do not use VS
TAB: Assistants
TAB: Assistant Configuration
ESS (Energy Storage System) (size:978)

*)    System uses LiFePo4 with other type BMS
    (This can be either a BMS connected via CAN bus or a BMS system in which the 
    batteries are protected from high/low cell voltages by external equipment.)
*)    The battery capacity of the system is 200 Ah.
*)    Sustain voltage 48.00 V.
*)    Cut off voltage for a discharge current of:
    0.005 C= 46.00 V
    0.25 C= 46.00 V
    0.7 C= 46.00 V
    2 C= 46.00 V
*)    Inverting is allowed again when voltage rises 1.20 V above cut-off(0).
*)    Relevant VEConfigure settings:
      -  Battery capacity 200 Ah.
      -  PowerAssist unchecked
      -  Lithium batteries checked
      -  Dynamic current limiter unchecked
      -  Storage mode unchecked

Total size of all assistants including the required
(hidden) system assistants is: 1037

GX device¶

seems to be an : Allwinner sun8i Family

Use the firmware 'large' to have access to MQTT and Node-Red.

https://www.victronenergy.com/live/ccgx:root_access

ESPhome grid meter¶

Using the the following extra software on the GX device to enable mqtt devices to connect to the victron GX and be used as a grid meter:
https://github.com/freakent/dbus-mqtt-devices

Using the following ESPHome alternate P1 meter configuration to send P1 data to the GX device AND to home assistant:

after updating the firmware you seem to need to run the setup.sh script again.

esphome p1meter victron version

GX to Home Assistant¶

To get information from the GX device into home assistant you can use the following HACS addon: https://github.com/sfstar/hass-victron

To get the battery input/output into the energy dashboard you need to split the sensor.victron_system_battery_power into two values with template sensors and add two cummulative entries with the integration platform.

configuration.ymlconfiguration.yml

sensor:
    #total battery input energy (cummulate)
  - platform: integration
    source: sensor.battery_power_input
    name: battery_input_energy
    unit_prefix: k
    method: left
    round: 3
    #total battery output energy (cummulate)
  - platform: integration
    source: sensor.battery_power_output
    name: battery_output_energy
    unit_prefix: k
    method: left
    round: 3

----

template:
  -  sensor:
      - name: "Battery power input" 
        unique_id: sensor.battery_power_input
        device_class: power
        unit_of_measurement: "W" 
        state: >
          {% if states('sensor.victron_system_battery_power')|float >= 0 %}
            {{ states('sensor.victron_system_battery_power') }}
          {% else %}
            0
          {% endif %}
      - name: "Battery power output" 
        unique_id: sensor.battery_power_output
        device_class: power
        unit_of_measurement: "W" 
        state: >
          {% if states('sensor.victron_system_battery_power')|float < 0 %}
            {{ -1 * states('sensor.victron_system_battery_power')|float }}
          {% else %}
            0
          {% endif %}

GX Venus OS Large¶

You can update the firmware with a Venus OS Large version. This version includes Node-RED. In the Remote Console, this can be enabled and you can finde node-red on https://venus:1881/

when installing Venus OS Large, you better run

/opt/victronenergy/swupdate-scripts/resize2fs.sh

Pylontech 5000US¶

https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom