Ess » History » Revision 11
Revision 10 (Micha Kersloot, 12-07-2023 10:01) → Revision 11/16 (Micha Kersloot, 14-07-2023 08:50)
h1. Ess {{>toc}} 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. h1. EasySolar II ESS #1 means low SOC h2. Multiplus II {{collapse(Configuration) <pre> 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 </pre> }} h2. GX device seems to be an : Allwinner sun8i Family https://www.victronenergy.com/live/ccgx:root_access h3. 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]] h3. 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. {{collapse(configuration.yml) <pre> 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 %} </pre> }} h3. 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 h1. Pylontech 5000US https://www.victronenergy.com/live/battery_compatibility:pylontech_phantom