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JKBMS
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For LFP it is notoriously hard to judge the SOC by the voltage. As you can see in this (randomly picked) chart:
If you want to know the SOC you need to measure exactly how much is going in and how much is going out, this is normally done with a shunt (or coulomb counter). This may or may not be built into a BMS. I don't have a JK BMS so I'm not sure if it has one or not.
But definitely don't just judge the capacity by voltage if you want an accurate SOC.
Edit: Since the BMS has a maximum Amperage maybe it does have a shunt built in. I guess the maximum amperage is there because the current is routed through the BMS itself and therefore it should be able to calculate it?
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Not sure if we can pin this post or something similar but it might help folk getting the live data from the JKBMSes and connecting it to Home Assistant (using the new inverter type myself, but works with older models also)
There are two integrations that can be used (probably more) https://github.com/syssi/esphome-jk-bms and https://github.com/fl4p/batmon-ha and they both connect via bluetooth (creating a BT proxy using a cheap esp32 board works best)
I prefer the former as this one also lets you change things like cell voltage limits and then charge/discharge/balance and float mode (coming soon)
You can also connect directly to the BMS via uart/esphome and skip the bluetooth part.
Basically just drop this into your eshome device yaml, change it with your wifi details and the MAC address of the bms and the esp board you're using:
substitutions: name: jk-bms device_description: "Monitor and control a JK-BMS via bluetooth" external_components_source: github://syssi/esphome-jk-bms@main mac_address: C8:47:80:07:A9:8A # Defaults to "JK02" (hardware version >= 6.0 and < 11.0) # Please use "JK02_32S" if you own a new JK-BMS >= hardware version 11.0 (f.e. JK-B2A8S20P hw 11.XW, sw 11.26) # Please use "JK04" if you have some old JK-BMS <= hardware version 3.0 (f.e. JK-B2A16S hw 3.0, sw. 3.3.0) protocol_version: JK02_32S esphome: name: ${name} comment: ${device_description} project: name: "syssi.esphome-jk-bms" version: 1.5.0 esp32: board: az-delivery-devkit-v4 framework: type: esp-idf external_components: - source: ${external_components_source} refresh: 0s wifi: ssid: !secret attic_ssid password: !secret attic_pw # Enable Home Assistant API api: encryption: key: "something-super-secure" ota: logger: level: DEBUG esp32_ble_tracker: on_ble_advertise: then: - lambda: |- if (x.get_name().rfind("JK-", 0) == 0) { ESP_LOGI("ble_adv", "New JK-BMS found"); ESP_LOGI("ble_adv", " Name: %s", x.get_name().c_str()); ESP_LOGI("ble_adv", " MAC address: %s", x.address_str().c_str()); ESP_LOGD("ble_adv", " Advertised service UUIDs:"); for (auto uuid : x.get_service_uuids()) { ESP_LOGD("ble_adv", " - %s", uuid.to_string().c_str()); } } ble_client: - mac_address: ${mac_address} id: client0 jk_bms_ble: - ble_client_id: client0 protocol_version: ${protocol_version} throttle: 5s id: bms0 binary_sensor: - platform: jk_bms_ble balancing: name: "${name} balancing" charging: name: "${name} charging" discharging: name: "${name} discharging" online_status: name: "${name} online status" button: - platform: jk_bms_ble retrieve_settings: name: "${name} retrieve settings" retrieve_device_info: name: "${name} retrieve device info" number: - platform: jk_bms_ble jk_bms_ble_id: bms0 balance_trigger_voltage: name: "${name} balance trigger voltage" cell_count: name: "${name} cell count" total_battery_capacity: name: "${name} total battery capacity" cell_voltage_overvoltage_protection: name: "${name} cell voltage overvoltage protection" cell_voltage_overvoltage_recovery: name: "${name} cell voltage overvoltage recovery" cell_voltage_undervoltage_protection: name: "${name} cell voltage undervoltage protection" cell_voltage_undervoltage_recovery: name: "${name} cell voltage undervoltage recovery" balance_starting_voltage: name: "${name} balance starting voltage" voltage_calibration: name: "${name} voltage calibration" current_calibration: name: "${name} current calibration" power_off_voltage: name: "${name} power off voltage" max_balance_current: name: "${name} max balance current" max_charge_current: name: "${name} max charge current" max_discharge_current: name: "${name} max discharge current" sensor: - platform: jk_bms_ble jk_bms_ble_id: bms0 min_cell_voltage: name: "${name} min cell voltage" max_cell_voltage: name: "${name} max cell voltage" min_voltage_cell: name: "${name} min voltage cell" max_voltage_cell: name: "${name} max voltage cell" delta_cell_voltage: name: "${name} delta cell voltage" average_cell_voltage: name: "${name} average cell voltage" cell_voltage_1: name: "${name} cell voltage 1" cell_voltage_2: name: "${name} cell voltage 2" cell_voltage_3: name: "${name} cell voltage 3" cell_voltage_4: name: "${name} cell voltage 4" cell_voltage_5: name: "${name} cell voltage 5" cell_voltage_6: name: "${name} cell voltage 6" cell_voltage_7: name: "${name} cell voltage 7" cell_voltage_8: name: "${name} cell voltage 8" cell_voltage_9: name: "${name} cell voltage 9" cell_voltage_10: name: "${name} cell voltage 10" cell_voltage_11: name: "${name} cell voltage 11" cell_voltage_12: name: "${name} cell voltage 12" cell_voltage_13: name: "${name} cell voltage 13" cell_voltage_14: name: "${name} cell voltage 14" cell_voltage_15: name: "${name} cell voltage 15" cell_voltage_16: name: "${name} cell voltage 16" cell_voltage_17: name: "${name} cell voltage 17" cell_voltage_18: name: "${name} cell voltage 18" cell_voltage_19: name: "${name} cell voltage 19" cell_voltage_20: name: "${name} cell voltage 20" cell_voltage_21: name: "${name} cell voltage 21" cell_voltage_22: name: "${name} cell voltage 22" cell_voltage_23: name: "${name} cell voltage 23" cell_voltage_24: name: "${name} cell voltage 24" cell_resistance_1: name: "${name} cell resistance 1" cell_resistance_2: name: "${name} cell resistance 2" cell_resistance_3: name: "${name} cell resistance 3" cell_resistance_4: name: "${name} cell resistance 4" cell_resistance_5: name: "${name} cell resistance 5" cell_resistance_6: name: "${name} cell resistance 6" cell_resistance_7: name: "${name} cell resistance 7" cell_resistance_8: name: "${name} cell resistance 8" cell_resistance_9: name: "${name} cell resistance 9" cell_resistance_10: name: "${name} cell resistance 10" cell_resistance_11: name: "${name} cell resistance 11" cell_resistance_12: name: "${name} cell resistance 12" cell_resistance_13: name: "${name} cell resistance 13" cell_resistance_14: name: "${name} cell resistance 14" cell_resistance_15: name: "${name} cell resistance 15" cell_resistance_16: name: "${name} cell resistance 16" cell_resistance_17: name: "${name} cell resistance 17" cell_resistance_18: name: "${name} cell resistance 18" cell_resistance_19: name: "${name} cell resistance 19" cell_resistance_20: name: "${name} cell resistance 20" cell_resistance_21: name: "${name} cell resistance 21" cell_resistance_22: name: "${name} cell resistance 22" cell_resistance_23: name: "${name} cell resistance 23" cell_resistance_24: name: "${name} cell resistance 24" total_voltage: name: "${name} total voltage" current: name: "${name} current" power: name: "${name} power" charging_power: name: "${name} charging power" discharging_power: name: "${name} discharging power" temperature_sensor_1: name: "${name} temperature sensor 1" temperature_sensor_2: name: "${name} temperature sensor 2" power_tube_temperature: name: "${name} power tube temperature" state_of_charge: name: "${name} state of charge" capacity_remaining: name: "${name} capacity remaining" total_battery_capacity_setting: name: "${name} total battery capacity setting" charging_cycles: name: "${name} charging cycles" total_charging_cycle_capacity: name: "${name} total charging cycle capacity" total_runtime: name: "${name} total runtime" balancing_current: name: "${name} balancing current" errors_bitmask: name: "${name} errors bitmask" switch: - platform: jk_bms_ble charging: name: "${name} charging" discharging: name: "${name} discharging" balancer: name: "${name} balancer" - platform: ble_client ble_client_id: client0 name: "${name} enable bluetooth connection" text_sensor: - platform: jk_bms_ble errors: name: "${name} errors" total_runtime_formatted: name: "${name} total runtime formatted"Post edited by SD_DRACULA on3 -
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