My system:
Huawei 3KTL-M1 3 phase inverter with WIFI dongle
Victron Multiplus II on phase A
EM24 Smart Meter
My system works fine, battery is charging from production surplus (rare, because these days I have only 150-200W production), but I was missing solar data in vrm.
I now is only a cosmetic thing.
I was looking for this and I found 2 resources to inspire from:
HOUSEDOMOTICZ Youtube channel which shared his JSON files. I took a big chunk from here. Thank You Sir!
Schatten PV Youtube channel which gave me a basic notion about how things work. Thank You
Since I did not find an easy to use resource I will let this here, maybe will help.
Had to enable TCP modbus on Huawei.
Do not let your devices on DHCP. I had Huawei on DHCP and never bothered me until now 
Had to load node-red-contrib-modbus and node-red-contrib-modbus-tcp-ip palletes (I think only one is actually used, but if it works, why bother)
After import you have to modify ip address under the server setting on ModBus-Flex-Sequencer node.
I know there a lot of unused data, if that bothers you, delete the nodes.
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"id": "d692c66251e2f6d7",
"type": "tab",
"label": "fotovoltaico",
"disabled": false,
"info": "",
"env": []
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{
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"type": "inject",
"z": "d692c66251e2f6d7",
"name": "",
"props": [
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{
"p": "topic",
"vt": "str"
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"repeat": "10",
"crontab": "",
"once": true,
"onceDelay": 0.1,
"topic": "",
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"payloadType": "date",
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"func": "let rawData = new ArrayBuffer(4);\nlet intView = new Int16Array(rawData);\nlet fltView = new Int32Array(rawData);\n\nintView[0] = msg.payload[65]; //low\nintView[1] = msg.payload[64]; //high\n\nmsg.payload = parseFloat(fltView[0].toFixed(0));\nmsg.topic = \"Power\";\n\nnode.status({fill:\"blue\",shape:\"ring\",text:msg.topic + \":\" + msg.payload + \" W\"}); \n\nreturn msg;",
"outputs": 1,
"timeout": "",
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"type": "function",
"z": "d692c66251e2f6d7",
"name": "String 1 Voltage",
"func": "let S1 = msg.payload[0]/10 \n\nmsg.topic = \"tensione\";\nmsg.payload = parseFloat((S1).toFixed(1));\nnode.status({fill:\"blue\",shape:\"ring\",text:msg.topic + \":\" + msg.payload + \" V\"});\nreturn msg;",
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"libs": [],
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"libs": [],
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{
"id": "a0cda5fbccbb0a4e",
"type": "function",
"z": "d692c66251e2f6d7",
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"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
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"libs": [],
"x": 680,
"y": 460,
"wires": [
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{
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"type": "function",
"z": "d692c66251e2f6d7",
"name": "Inverter cosfi",
"func": "let S1 = msg.payload[68]/1000 \n\nmsg.topic = \"cosfi\";\nmsg.payload = parseFloat((S1).toFixed(2));\nnode.status({fill:\"blue\",shape:\"ring\",text:msg.topic + \":\" + msg.payload});\nreturn msg;",
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"timeout": "",
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"libs": [],
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"y": 520,
"wires": [
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{
"id": "c5661fb640eeb543",
"type": "function",
"z": "d692c66251e2f6d7",
"name": "Inverter frequency",
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"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 650,
"y": 580,
"wires": [
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},
{
"id": "c0bf0aa71990e706",
"type": "function",
"z": "d692c66251e2f6d7",
"name": "Inverter temperature",
"func": "let S1 = msg.payload[71]/10\n\nmsg.topic = \"temperatura\";\nmsg.payload = parseFloat((S1).toFixed(1));\nnode.status({fill:\"blue\",shape:\"ring\",text:msg.topic + \":\" + msg.payload + \" °C\"});\nreturn msg;",
"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
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"libs": [],
"x": 660,
"y": 700,
"wires": [
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},
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"z": "d692c66251e2f6d7",
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"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 650,
"y": 340,
"wires": [
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},
{
"id": "2971dd2678ef3bcf",
"type": "comment",
"z": "d692c66251e2f6d7",
"name": "INVERTER",
"info": "",
"x": 250,
"y": 560,
"wires": []
},
{
"id": "f26e2ee653e94b5f",
"type": "function",
"z": "d692c66251e2f6d7",
"name": "Inverter efficiency",
"func": "let S1 = msg.payload[70]/100\n\nmsg.topic = \"efficienza\";\nmsg.payload = parseFloat((S1).toFixed(1));\nnode.status({fill:\"blue\",shape:\"ring\",text:msg.topic + \":\" + msg.payload + \" %\"});\nreturn msg;",
"outputs": 1,
"timeout": "",
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"initialize": "",
"finalize": "",
"libs": [],
"x": 650,
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"wires": [
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},
{
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"type": "modbus-flex-sequencer",
"z": "d692c66251e2f6d7",
"name": "",
"sequences": [
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"name": "",
"unitid": "1",
"fc": "FC3",
"address": "32016",
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],
"server": "cabd9520437b6e88",
"showStatusActivities": false,
"showErrors": false,
"showWarnings": true,
"logIOActivities": false,
"useIOFile": false,
"ioFile": "",
"useIOForPayload": false,
"emptyMsgOnFail": false,
"keepMsgProperties": false,
"delayOnStart": false,
"startDelayTime": "",
"x": 240,
"y": 620,
"wires": [
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"type": "victron-virtual",
"z": "d692c66251e2f6d7",
"name": "SUN2000-3KTL-M1",
"device": "pvinverter",
"default_values": false,
"battery_capacity": 25,
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"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": "3",
"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": 310,
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"wires": []
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{
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"z": "d692c66251e2f6d7",
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"path": "/Ac/Power",
"serviceObj": {
"service": "com.victronenergy.pvinverter/100",
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"pathObj": {
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"name": "/Ac/Power",
"type": "object",
"value": null
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"name": "",
"onlyChanges": false,
"x": 950,
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"wires": []
},
{
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"type": "function",
"z": "d692c66251e2f6d7",
"name": "L1 Voltage",
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"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 630,
"y": 760,
"wires": [
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{
"id": "v_l2_extraction",
"type": "function",
"z": "d692c66251e2f6d7",
"name": "L2 Voltage",
"func": "let S1 = msg.payload[54] / 10; \nmsg.topic = \"L2_Voltage\";\nmsg.payload = parseFloat((S1).toFixed(1));\nnode.status({fill:\"blue\",shape:\"ring\",text:msg.topic + \":\" + msg.payload + \" V\"}); \nreturn msg;",
"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 630,
"y": 820,
"wires": [
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{
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"type": "function",
"z": "d692c66251e2f6d7",
"name": "L3 Voltage",
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"outputs": 1,
"timeout": "",
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"initialize": "",
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"libs": [],
"x": 630,
"y": 880,
"wires": [
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{
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"z": "d692c66251e2f6d7",
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"serviceObj": {
"service": "com.victronenergy.pvinverter/100",
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},
"pathObj": {
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"name": "/Ac/L1/Voltage",
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},
"name": "",
"onlyChanges": false,
"x": 900,
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"wires": []
},
{
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{
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"type": "function",
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{
"id": "p_l1_calc_node",
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"name": "L1 Power",
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"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 620,
"y": 1160,
"wires": [
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{
"id": "p_l2_calc_node",
"type": "function",
"z": "d692c66251e2f6d7",
"name": "L2 Power",
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"timeout": "",
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"serviceObj": {
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"pathObj": {
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{
"id": "8c52687acb1e74b6",
"type": "victron-output-custom",
"z": "d692c66251e2f6d7",
"service": "com.victronenergy.pvinverter/100",
"path": "/Ac/L1/Power",
"serviceObj": {
"service": "com.victronenergy.pvinverter/100",
"name": "SUN2000-3KTL-M1 (100)"
},
"pathObj": {
"path": "/Ac/L1/Power",
"name": "/Ac/L1/Power",
"type": "number",
"value": 0
},
"name": "",
"onlyChanges": false,
"x": 900,
"y": 1160,
"wires": []
},
{
"id": "42213deb5bd76e5c",
"type": "victron-output-custom",
"z": "d692c66251e2f6d7",
"service": "com.victronenergy.pvinverter/100",
"path": "/Ac/L2/Power",
"serviceObj": {
"service": "com.victronenergy.pvinverter/100",
"name": "SUN2000-3KTL-M1 (100)"
},
"pathObj": {
"path": "/Ac/L2/Power",
"name": "/Ac/L2/Power",
"type": "number",
"value": 0
},
"name": "",
"onlyChanges": false,
"x": 900,
"y": 1220,
"wires": []
},
{
"id": "2156f33ef7097625",
"type": "victron-output-custom",
"z": "d692c66251e2f6d7",
"service": "com.victronenergy.pvinverter/100",
"path": "/Ac/L3/Power",
"serviceObj": {
"service": "com.victronenergy.pvinverter/100",
"name": "SUN2000-3KTL-M1 (100)"
},
"pathObj": {
"path": "/Ac/L3/Power",
"name": "/Ac/L3/Power",
"type": "number",
"value": 0
},
"name": "",
"onlyChanges": false,
"x": 900,
"y": 1280,
"wires": []
},
{
"id": "accumulated_yield_final_fixed",
"type": "function",
"z": "d692c66251e2f6d7",
"name": "Accumulated Yield (kWh)",
"func": "if (!Array.isArray(msg.payload)) {\n node.status({fill:\"red\", shape:\"ring\", text: \"Input not an array\"});\n return null;\n}\n\n// Based on debug: Index 90 = 12 (High), Index 91 = 58513 (Low)\nlet high = msg.payload[90];\nlet low = msg.payload[91];\n\nif (high === undefined || low === undefined) {\n node.status({fill:\"red\", shape:\"dot\", text: \"Indices 90/91 missing\"});\n return null;\n}\n\n// Reconstruct 32-bit unsigned integer\n// Shift high word 16 bits left and combine with low word\nlet rawVal = ((high << 16) >>> 0) + (low >>> 0);\n\n// Huawei Scaling: 0.01 kWh\nmsg.payload = parseFloat((rawVal / 100).toFixed(2));\nmsg.topic = \"Accumulated_Yield\";\n\nnode.status({fill:\"blue\", shape:\"ring\", text: msg.payload + \" kWh\"});\n\nreturn msg;",
"outputs": 1,
"timeout": "",
"noerr": 0,
"initialize": "",
"finalize": "",
"libs": [],
"x": 590,
"y": 1340,
"wires": [
[
"5011fcd17c5beab6"
]
]
},
{
"id": "5011fcd17c5beab6",
"type": "victron-output-custom",
"z": "d692c66251e2f6d7",
"service": "com.victronenergy.pvinverter/100",
"path": "/Ac/Energy/Forward",
"serviceObj": {
"service": "com.victronenergy.pvinverter/100",
"name": "SUN2000-3KTL-M1 (100)"
},
"pathObj": {
"path": "/Ac/Energy/Forward",
"name": "/Ac/Energy/Forward",
"type": "number",
"value": 8449.45
},
"name": "",
"onlyChanges": false,
"x": 920,
"y": 1340,
"wires": []
},
{
"id": "cabd9520437b6e88",
"type": "modbus-client",
"name": "HUAWEI SUN2000",
"clienttype": "tcp",
"bufferCommands": true,
"stateLogEnabled": false,
"queueLogEnabled": false,
"failureLogEnabled": true,
"tcpHost": "192.168.2.16",
"tcpPort": "502",
"tcpType": "DEFAULT",
"serialPort": "/dev/ttyUSB",
"serialType": "RTU-BUFFERD",
"serialBaudrate": "9600",
"serialDatabits": "8",
"serialStopbits": "1",
"serialParity": "none",
"serialConnectionDelay": "100",
"serialAsciiResponseStartDelimiter": "0x3A",
"unit_id": 1,
"commandDelay": 1,
"clientTimeout": 3000,
"reconnectOnTimeout": true,
"reconnectTimeout": 5000,
"parallelUnitIdsAllowed": true,
"showErrors": false,
"showWarnings": true,
"showLogs": true
}
]