Accessing SunSpec with Modbus TCP
This flow offers a generic approach for accessing SunSpec data via Modbus TCP communication based on the node-red-contrib-modbus module (https://flows.nodered.org/node/node-red-contrib-modbus).
It provides an example of reading data (Max PV Power and PV Power Limit) and an example of writing data (PV Power Limit).
It has been tested with the Enphase gateway and should work with any inverters that support Modbus TCP access and comply with SunSpec.
To understand what the data from the various Device Information Models corresponds to, refer to the SunSpec documentation (see https://sunspec.org/specifications/#sunspec-modbus2b84-f1df).
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{\n node.status({});\n throw \"Unable to find map address\";\n}\n\nlet map_addresses = [ 0, 40000, 50000 ];\nlet map_address = map_addresses[address_index];\nnode.status({fill:'grey',shape:'dot',text:'Address:' + map_address});\n\nmsg.payload = {\n unitid: 125,\n address: map_address,\n quantity: 2,\n fc: 3\n}\n\ncontext.set('address_index', address_index + 1);\n\nreturn msg;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":370,"y":220,"wires":[["5d7eaa70fc61da85"]]},{"id":"fdbdeea371124ad0","type":"function","z":"1b6376f996c2082d","name":"Set flow variable sunspec","func":"if (typeof msg.error === 'object') {\n flow.set('sunspec', null);\n node.status({fill:'red',shape:'dot',text:msg.error.message})\n} else if (msg.payload.buffer[0] == 0x53 && msg.payload.buffer[1] == 0x75 && msg.payload.buffer[2] == 0x6e && msg.payload.buffer[3] == 0x53) {\n // buffer[] = 'SunS' ?\n if (typeof msg.modbusRequest.address === 'number') {\n flow.set('sunspec', { map_address: msg.modbusRequest.address, dims: [] });\n node.status({fill:'grey',shape:'dot',text:'Map address: ' + msg.modbusRequest.address})\n return { payload: { address: msg.modbusRequest.address, length: 0 }, topic: 'Get DIM' }\n } else {\n throw \"Invalid map address\";\n }\n} else {\n throw \"Invalid map address\";\n}\n\nreturn null;","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":830,"y":220,"wires":[["3bc5b8dac24f1950"]]},{"id":"01b0a97d6d29a1e9","type":"catch","z":"1b6376f996c2082d","name":"","scope":["5d7eaa70fc61da85","fdbdeea371124ad0"],"uncaught":false,"x":150,"y":220,"wires":[["3bb964372e3930d0"]]},{"id":"6f66075d5739c9c2","type":"catch","z":"1b6376f996c2082d","name":"","scope":["3bb964372e3930d0"],"uncaught":false,"x":630,"y":180,"wires":[["fdbdeea371124ad0"]]},{"id":"3bc5b8dac24f1950","type":"function","z":"1b6376f996c2082d","name":"Get DIM","func":"let sunspec = flow.get('sunspec');\nif (typeof sunspec !== 'object' || !Array.isArray(sunspec.dims)) 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