[Pylontech 4.8kWh 5000 Battery] individual cell voltage monitoring via WiFi to MQTT broker #1391
gitisgreat2023
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I wanted to monitor my individual cells of my Pylontech 5000, before I build my DIY 48V box and sell my Pylontech. Especially the balancing I'm interested in, to gain some experience with those topics before going to the DIY box.
So I needed the individual cell voltages in a database, in my case iobroker with the history adapter on MQTT topics.
It wasn't completely trivial so I would like to share my experiences to enable other people to have a jump start and have a working system very fast.
Step 1:
Solder together the hardware according to this.
I have one change, I use the 5V instead the 3.3V to power the Max3232. That's the pin next to GND on the ESP. You put the LAN cable into the console port of the Pylontech, on the other end you need pin 3 6 and 8 (gnd).
Step 2:
Then configure (WiFi and MQTT credentials), compile and flash PylontechMonitoring.ino on your ESP86266.
Step 4:
Test your setup. Connect to your ESP and execute the command "bat".
That should give you a result like this:
Step 5:
Configure Node Red to extract the output of Step 4 automatically every 10 seconds and store those 15 voltages (and 3 other: min, max and (max-min)) to MQTT.
The Node Red code is running since 12 hours without an issue. I'm a complete newbie in Node Red so probably it can be done much more elegant.
Code
[ { "id": "210ecc232aa515d1", "type": "tab", "label": "Pylontech", "disabled": false, "info": "", "env": [] }, { "id": "1a2b3c4d5e6f7g8h", "type": "http request", "z": "210ecc232aa515d1", "name": "Get Battery Data", "method": "GET", "ret": "txt", "paytoqs": "ignore", "url": "http://pylon.fritz.box/req?code=bat", "tls": "", "persist": false, "proxy": "", "insecureHTTPParser": false, "authType": "", "senderr": false, "headers": [], "x": 890, "y": 540, "wires": [ [ "2b3c4d5e6f7g8h9i" ] ] }, { "id": "2b3c4d5e6f7g8h9i", "type": "function", "z": "210ecc232aa515d1", "name": "Process Battery Data", "func": "// Get the HTML input from the HTTP request\nlet htmlInput = msg.payload;\n\n// Use a regular expression to extract voltage values from the provided HTML\nlet voltageRegex = /\\d+\\s+(\\d+)\\s+-?\\d+\\s+\\d+\\s+\\w+\\s+\\w+\\s+\\w+\\s+\\w+\\s+\\d+%\\s+\\d+\\s+\\w+/g;\nlet voltages = [];\nlet labels = [];\nlet match;\n\n// Loop through all matches and extract the voltage (second column)\nlet index = 0;\nwhile ((match = voltageRegex.exec(htmlInput)) !== null) {\n if (match[1] !== '-') { // Check if the voltage is not absent\n voltages.push(parseInt(match[1]));\n node.warn(\"C\" + (index + 1) +' '+voltages[index]+'mV')\n labels.push('C' + (index + 1) + ' ' + voltages[index] + 'mV'); // Create labels for each cell\n //labels.push(`C${index + 1}${voltages[index]}`); // Create labels for each cell\n index++;\n }\n}\n\n\n\n// Calculate the minimum and maximum voltages\nlet minVoltage = Math.min(...voltages);\nlet maxVoltage = Math.max(...voltages);\n\n// Calculate the average voltage\nlet averageVoltage = voltages.reduce((sum, voltage) => sum + voltage, 0) / voltages.length;\n\n//node.warn(\"voltages: \" + voltages)\n\n// Prepare the title for the bar chart with dynamic values divided by 1000\nmsg.title = `Avg${(averageVoltage / 1000).toFixed(2)}V,Min:${(minVoltage / 1000).toFixed(2)}V,Max:${(maxVoltage / 1000).toFixed(2)}V,delta:${((maxVoltage - minVoltage)).toFixed(0)}mV`;\n\nmsg.payload = [{\n \"labels\": labels,\n \"data\": [voltages],\n \"series\": [msg.title] \n}];\n\n//node.warn(\"title: \" + msg.title)\n\nconst messages = {};\n// Loop through each line and extract the voltage\nfor (let i = 0; i < 15; i++) {\n messages[`cellv_${i + 1}`] = voltages[i];\n}\nmessages['cellv_min'] = minVoltage;\nmessages['cellv_max'] = maxVoltage;\nmessages['cellv_delta'] = maxVoltage - minVoltage;\nmsg.mqtt = [messages];\n\nmsg.mqtt = [...voltages,minVoltage,maxVoltage,maxVoltage - minVoltage];\n\n// Set dynamic ymin and ymax for auto-zooming\nmsg.ui_control = {\n ymin: minVoltage - 2, // Optional padding\n ymax: maxVoltage + 2, // Optional padding\n title: msg.title\n};\n\n// Return the modified message\nreturn msg;", "outputs": 1, "timeout": "", "noerr": 0, "initialize": "", "finalize": "", "libs": [], "x": 1140, "y": 540, "wires": [ [ "3c4d5e6f7g8h9i0j", "967347af5d917976", "86c188e82de695c4" ] ] }, { "id": "3c4d5e6f7g8h9i0j", "type": 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