Hi All,
I’d ideally like to make a virtual BMS and use node red to combine the two physical fogstar bms’s info into one so the cerbo can use this info for control. I could use the battery aggregator from github but ideally I want the figures to change as they do from the fogstar bms’s. It seems the the battery aggregator is fixed values which is no good. Any pointers please?
I worked it out, just use the new virtual device and select battery. Then do the rest of the flow to add multiple bms’s together.
The virtual device has no input?
Are you using dbus?
I think so. Flow below. I just used two versions of my bank of fogstar batteries to emulate when I run two banks of 16 fogstar batteries. Done the sums to add some stats together like ccl and then averaging battery voltage etc.
If anyone sees anything wrong let me know. This has to be 100% reliable as it will be running my whole business in ess.
Edit: I can’t make the flow show properly so I give up 
```flow
[
{
"id": "94147fbcc564dd23",
"type": "tab",
"label": "BMS Combine",
"disabled": false,
"info": "",
"env": []
},
{
"id": "78dad5a002063712",
"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Info/MaxChargeCurrent",
"type": "float",
"name": "CCL - Charge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 40,
"wires": [
[
"48de2d88c06b8b89"
]
]
},
{
"id": "31df306df36400ee",
"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Info/MaxChargeCurrent",
"type": "float",
"name": "CCL - Charge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 100,
"wires": [
[
"c0272b634e992737"
]
]
},
{
"id": "3d669fc7ce18f34f",
"type": "function",
"z": "94147fbcc564dd23",
"name": "CCL",
"func": "msg.payload = msg.bat1ccl + msg.bat2ccl\nreturn msg;",
"outputs": 1,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 790,
"y": 60,
"wires": [
[
"7cf2843a3fbc6a50"
]
]
},
{
"id": "48de2d88c06b8b89",
"type": "change",
"z": "94147fbcc564dd23",
"name": "",
"rules": [
{
"t": "set",
"p": "bat1ccl",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 480,
"y": 40,
"wires": [
[]
]
},
{
"id": "c0272b634e992737",
"type": "change",
"z": "94147fbcc564dd23",
"name": "",
"rules": [
{
"t": "set",
"p": "bat2ccl",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 480,
"y": 100,
"wires": [
[]
]
},
{
"id": "a25fe40d1f0adb3e",
"type": "inject",
"z": "94147fbcc564dd23",
"name": "",
"props": [
{
"p": "bat1ccl",
"v": "bat1ccl",
"vt": "flow"
},
{
"p": "bat2ccl",
"v": "bat2ccl",
"vt": "flow"
}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "0.5",
"topic": "",
"x": 670,
"y": 60,
"wires": [
[
"3d669fc7ce18f34f"
]
]
},
{
"id": "b8b14f2d591f1fee",
"type": "victron-virtual",
"z": "94147fbcc564dd23",
"name": "Work",
"device": "battery",
"default_values": true,
"battery_capacity": "20000",
"include_battery_temperature": true,
"grid_nrofphases": 1,
"include_motor_temp": false,
"include_controller_temp": false,
"include_coolant_temp": false,
"include_motor_rpm": true,
"include_motor_direction": true,
"position": 0,
"pvinverter_nrofphases": 1,
"fluid_type": 0,
"include_tank_battery": false,
"include_tank_temperature": false,
"tank_battery_voltage": 3.3,
"tank_capacity": 0.2,
"temperature_type": 2,
"include_humidity": false,
"include_pressure": false,
"include_temp_battery": false,
"temp_battery_voltage": 3.3,
"x": 650,
"y": 160,
"wires": []
},
{
"id": "7cf2843a3fbc6a50",
"type": "victron-output-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/101",
"path": "/Info/MaxChargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/101",
"name": "Work"
},
"pathObj": {
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"type": "float",
"name": "CCL - Charge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 1050,
"y": 60,
"wires": []
},
{
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"type": "victron-input-battery",
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"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeVoltage",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
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"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeVoltage",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Info/MaxChargeVoltage",
"type": "float",
"name": "CVL - Charge Voltage Limit (V)"
},
"name": "",
"onlyChanges": false,
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"wires": [
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{
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"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxDischargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "DCL - Discharge Current Limit (A)"
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"onlyChanges": false,
"x": 180,
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"wires": [
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{
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"type": "victron-input-battery",
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"service": "com.victronenergy.battery/512",
"path": "/Info/MaxDischargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Info/MaxDischargeCurrent",
"type": "float",
"name": "DCL - Discharge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 420,
"wires": [
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{
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"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Soc",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "State of charge (%)"
},
"name": "",
"onlyChanges": false,
"x": 140,
"y": 480,
"wires": [
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},
{
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"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Soc",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Soc",
"type": "float",
"name": "State of charge (%)"
},
"name": "",
"onlyChanges": false,
"x": 140,
"y": 540,
"wires": [
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{
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"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Dc/0/Voltage",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Dc/0/Voltage",
"type": "float",
"name": "Battery voltage (V)"
},
"name": "",
"onlyChanges": false,
"x": 140,
"y": 620,
"wires": [
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},
{
"id": "1fc7e92357dc1c0b",
"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Dc/0/Voltage",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Dc/0/Voltage",
"type": "float",
"name": "Battery voltage (V)"
},
"name": "",
"onlyChanges": false,
"x": 140,
"y": 680,
"wires": [
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},
{
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"type": "change",
"z": "94147fbcc564dd23",
"name": "",
"rules": [
{
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"p": "bat1cvl",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 480,
"y": 220,
"wires": [
[]
]
},
{
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"type": "change",
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"name": "",
"rules": [
{
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"pt": "flow",
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{
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"type": "change",
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"rules": [
{
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"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
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"x": 480,
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{
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"rules": [
{
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{
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"pt": "flow",
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{
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{
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{
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],
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"wires": [
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{
"id": "676ccdb54730c5e3",
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"z": "94147fbcc564dd23",
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"func": "msg.payload = (msg.bat1cvl + msg.bat2cvl)/2\nreturn msg;",
"outputs": 1,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
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"y": 260,
"wires": [
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{
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"name": "DCL",
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"initialize": "",
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},
{
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"name": "SOC",
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"noerr": 0,
"initialize": "",
"finalize": "",
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"wires": [
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},
{
"id": "8971dad44b02ab81",
"type": "function",
"z": "94147fbcc564dd23",
"name": "Bat Volts",
"func": "msg.payload = (msg.bat1volt + msg.bat2volt)/2\nreturn msg;",
"outputs": 1,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
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"y": 640,
"wires": [
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},
{
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"service": "com.victronenergy.battery/101",
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"serviceObj": {
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},
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"y": 260,
"wires": []
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{
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"path": "/Info/MaxDischargeCurrent",
"serviceObj": {
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"name": "Work"
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"type": "float",
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},
"name": "",
"onlyChanges": false,
"x": 1080,
"y": 380,
"wires": []
},
{
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"type": "victron-output-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/101",
"path": "/Soc",
"serviceObj": {
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"name": "Work"
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"pathObj": {
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"type": "float",
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"name": "",
"onlyChanges": false,
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"wires": []
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{
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],
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{
"id": "6348e3386cf77c83",
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"name": "Bat Current",
"func": "msg.payload = (msg.bat1current + msg.bat2current)\nreturn msg;",
"outputs": 1,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 810,
"y": 760,
"wires": [
[
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]
]
},
{
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"type": "function",
"z": "94147fbcc564dd23",
"name": "Bat Watts",
"func": "msg.payload = (msg.bat1watt + msg.bat2watt)\nreturn msg;",
"outputs": 1,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 800,
"y": 880,
"wires": [
[
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]
},
{
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"service": "com.victronenergy.battery/101",
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},
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},
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"onlyChanges": false,
"x": 1030,
"y": 760,
"wires": []
},
{
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"type": "victron-output-battery",
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"path": "/Dc/0/Power",
"serviceObj": {
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},
"pathObj": {
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},
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"onlyChanges": false,
"x": 1030,
"y": 880,
"wires": []
},
{
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"service": "com.victronenergy.battery/512",
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"serviceObj": {
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},
"pathObj": {
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},
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"wires": [
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},
{
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"service": "com.victronenergy.battery/512",
"path": "/System/MaxCellTemperature",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "Maximum cell temperature (°C)"
},
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"x": 180,
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"wires": [
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]
},
{
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"rules": [
{
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"p": "bat1temp",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
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"reg": false,
"x": 490,
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"wires": [
[]
]
},
{
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{
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}
],
"action": "",
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"reg": false,
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"wires": [
[]
]
},
{
"id": "352a937be5f4b326",
"type": "inject",
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"name": "",
"props": [
{
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"v": "bat1cvl",
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},
{
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"v": "bat2cvl",
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}
],
"repeat": "60",
"crontab": "",
"once": true,
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"wires": [
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},
{
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"type": "inject",
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{
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"v": "bat1dcl",
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},
{
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"v": "bat2dcl",
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}
],
"repeat": "2",
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"once": true,
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"wires": [
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},
{
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"name": "",
"props": [
{
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"v": "bat1soc",
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},
{
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"v": "bat2soc",
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}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "0.5",
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"x": 670,
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"wires": [
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]
},
{
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"type": "inject",
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"name": "",
"props": [
{
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"v": "bat1volt",
"vt": "flow"
},
{
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"v": "bat2volt",
"vt": "flow"
}
],
"repeat": "1",
"crontab": "",
"once": true,
"onceDelay": "0.5",
"topic": "",
"x": 670,
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"wires": [
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},
{
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"name": "",
"props": [
{
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"v": "bat1current",
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},
{
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}
],
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"once": true,
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},
{
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"type": "inject",
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"name": "",
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{
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"v": "bat1watt",
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},
{
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}
],
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"once": true,
"onceDelay": "0.5",
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"wires": [
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},
{
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"type": "victron-output-battery",
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"service": "com.victronenergy.battery/101",
"path": "/Dc/0/Temperature",
"serviceObj": {
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"name": "Work"
},
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"onlyChanges": false,
"x": 1090,
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"wires": []
},
{
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"type": "inject",
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}
],
"repeat": "5",
"crontab": "",
"once": true,
"onceDelay": "0.5",
"topic": "",
"payload": "bat1temp",
"payloadType": "flow",
"x": 700,
"y": 980,
"wires": [
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]
},
{
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"service": "com.victronenergy.battery/512",
"path": "/Info/BatteryLowVoltage",
"serviceObj": {
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"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "Min discharge voltage (V DC)"
},
"name": "",
"onlyChanges": false,
"x": 170,
"y": 1100,
"wires": [
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},
{
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"service": "com.victronenergy.battery/512",
"path": "/Info/BatteryLowVoltage",
"serviceObj": {
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},
"pathObj": {
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},
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"wires": [
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]
},
{
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"name": "",
"rules": [
{
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"p": "bat1disvolt",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
"from": "",
"to": "",
"reg": false,
"x": 490,
"y": 1100,
"wires": [
[]
]
},
{
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"type": "change",
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"name": "",
"rules": [
{
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"p": "bat2disvolt",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
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"reg": false,
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"wires": [
[]
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},
{
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"type": "function",
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"name": "Bat DisChar Volt",
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"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
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"wires": [
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},
{
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"name": "",
"props": [
{
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"v": "bat1disvolt",
"vt": "flow"
},
{
"p": "bat2disvolt",
"v": "bat2disvolt",
"vt": "flow"
}
],
"repeat": "30",
"crontab": "",
"once": true,
"onceDelay": "0.5",
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"wires": [
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]
},
{
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"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/101",
"path": "/Info/BatteryLowVoltage",
"serviceObj": {
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"name": "Work"
},
"pathObj": {
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"name": "",
"onlyChanges": false,
"x": 1070,
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"wires": []
},
{
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"type": "debug",
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"name": "debug 22",
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"tosidebar": true,
"console": false,
"tostatus": false,
"complete": "true",
"targetType": "full",
"statusVal": "",
"statusType": "auto",
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"y": 180,
"wires": []
},
{
"id": "1011d1458799efa5",
"type": "switch",
"z": "94147fbcc564dd23",
"name": "",
"property": "payload",
"propertyType": "msg",
"rules": [
{
"t": "gte",
"v": "bat2temp",
"vt": "flow"
}
],
"checkall": "true",
"repair": false,
"outputs": 1,
"x": 850,
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"wires": [
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"13ffd87dad00082d"
]
]
},
{
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"props": [
{
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}
],
"repeat": "5",
"crontab": "",
"once": true,
"onceDelay": "0.5",
"topic": "",
"payload": "bat2temp",
"payloadType": "flow",
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]
},
{
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"property": "payload",
"propertyType": "msg",
"rules": [
{
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}
],
"checkall": "true",
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},
{
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},
{
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}
]
I think there is an error in this flow.
You can make the flow render correctly by editing the topic in the simple text editor instead of rich text, but the json seems to be missing something to work.
Tried doing it again but it won’t have it!
[
{
"id": "94147fbcc564dd23",
"type": "tab",
"label": "BMS Combine",
"disabled": false,
"info": "",
"env": []
},
{
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"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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},
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"x": 180,
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"wires": [
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{
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"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Info/MaxChargeCurrent",
"type": "float",
"name": "CCL - Charge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 100,
"wires": [
[
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]
]
},
{
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"type": "function",
"z": "94147fbcc564dd23",
"name": "CCL",
"func": "msg.payload = msg.bat1ccl + msg.bat2ccl\nreturn msg;",
"outputs": 1,
"timeout": 0,
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 790,
"y": 60,
"wires": [
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]
]
},
{
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"name": "",
"rules": [
{
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"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
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"reg": false,
"x": 480,
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"wires": [
[]
]
},
{
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"type": "change",
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{
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"p": "bat2ccl",
"pt": "flow",
"to": "payload",
"tot": "msg"
}
],
"action": "",
"property": "",
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"reg": false,
"x": 480,
"y": 100,
"wires": [
[]
]
},
{
"id": "a25fe40d1f0adb3e",
"type": "inject",
"z": "94147fbcc564dd23",
"name": "",
"props": [
{
"p": "bat1ccl",
"v": "bat1ccl",
"vt": "flow"
},
{
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"v": "bat2ccl",
"vt": "flow"
}
],
"repeat": "2",
"crontab": "",
"once": true,
"onceDelay": "0.5",
"topic": "",
"x": 670,
"y": 60,
"wires": [
[
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]
]
},
{
"id": "b8b14f2d591f1fee",
"type": "victron-virtual",
"z": "94147fbcc564dd23",
"name": "Work",
"device": "battery",
"default_values": true,
"battery_capacity": "20000",
"include_battery_temperature": true,
"grid_nrofphases": 1,
"include_motor_temp": false,
"include_controller_temp": false,
"include_coolant_temp": false,
"include_motor_rpm": true,
"include_motor_direction": true,
"position": 0,
"pvinverter_nrofphases": 1,
"fluid_type": 0,
"include_tank_battery": false,
"include_tank_temperature": false,
"tank_battery_voltage": 3.3,
"tank_capacity": 0.2,
"temperature_type": 2,
"include_humidity": false,
"include_pressure": false,
"include_temp_battery": false,
"temp_battery_voltage": 3.3,
"x": 650,
"y": 160,
"wires": []
},
{
"id": "7cf2843a3fbc6a50",
"type": "victron-output-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/101",
"path": "/Info/MaxChargeCurrent",
"serviceObj": {
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"name": "Work"
},
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},
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"onlyChanges": false,
"x": 1050,
"y": 60,
"wires": []
},
{
"id": "625f86af576a86e7",
"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeVoltage",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "CVL - Charge Voltage Limit (V)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 220,
"wires": [
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]
]
},
{
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"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxChargeVoltage",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "CVL - Charge Voltage Limit (V)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 280,
"wires": [
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]
]
},
{
"id": "251157f93bb19d2e",
"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxDischargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
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"type": "float",
"name": "DCL - Discharge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 360,
"wires": [
[
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]
]
},
{
"id": "a21b2d5268216691",
"type": "victron-input-battery",
"z": "94147fbcc564dd23",
"service": "com.victronenergy.battery/512",
"path": "/Info/MaxDischargeCurrent",
"serviceObj": {
"service": "com.victronenergy.battery/512",
"name": "Fogstar"
},
"pathObj": {
"path": "/Info/MaxDischargeCurrent",
"type": "float",
"name": "DCL - Discharge Current Limit (A)"
},
"name": "",
"onlyChanges": false,
"x": 180,
"y": 420,
"wires": [
[
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]What did I do wrong?
I suspect you just needed to start from scratch and not edit the original post. I just copied the json into a new post.
That makes sense. Least everyone can see what can be done without using the battery aggregator software and this will use the live data from both banks, I suspect the battery aggregator used fixed data from what I could see for things like the CCL and DCL. Just a waiting game now till the 20kva Quattros are released to be able to get everything on order.