Converting a Null message from a Switch Node to a message of 1 or 0

Node-RED
,
1

I am trying to work out a method for using excess solar power to power a resistive load (Hot water Heater) using solid state relay while at the same time minimising battery draw down.

I have the output of the MPPT charge status and I am using the Change Node to output a message of “0” for all conditions other than Absorption and to output a message of “1” for Absorption.

Then using the shunt battery voltage with the Switch node to output a message “1” if greater than 57V. However when the voltage is less than 57V there is no message is output and the sum Node does not work.

How can I convert “no message output” from the switch node to output a message of either “0” or “1” ?

( This may be primitive (I am an inexperienced beginner) but if I can get two messages of either “0” or “1”, I can sum the outputs of either 0s or 1s and if the answer is “2” the MPPT is in Absorption and Voltage is greater than 57V. I can switch the Cerbo relay to “Closed” or if the answer is less than 2 then I can

Screenshot 2026-05-14 at 16.39.25
Screenshot 2026-05-14 at 16.39.252756×1678 517 KB

switch the relay to Open.)

2

This can be solved using very simple JavaScript programming—for example, by using:
let output = msg.payload || 0;
This reads as follows: if the node receives a value via msg.payload, it should assign that value to the variable output; otherwise, it should assign the value 0 to the variable. By analogy, you could also assign a 1 if msg.payload contains anything other than a 0.

3

Thank you for the advice but my technical knowledge level is very low. I tried adding your script to a function node as a cut and paste but that didn’t work. I apologise if I wasted your time.

5

My technical knowledge regarding Node-RED and JavaScript was also minimal until six weeks ago.

You won’t get very far with Node-RED without at least a basic understanding of JavaScript. You should definitely seize this opportunity to get started with it; otherwise, you won’t be able to do much with Node-RED.

JavaScript is truly extremely easy to learn.

6

The syntax may not be correct but you can do something like the code below in a Function node. This sets the incoming msg.payload to the value 1 if it is null.

if (msg.payload === null){
msg.payload = 1;
}

7

You can either do this by updating your switch node and adding a change node, or you could use a function node.

[{"id":"99c87101bf217d2a","type":"switch","z":"bb4a805c51d73376","name":"","property":"payload","propertyType":"msg","rules":[{"t":"gt","v":"57","vt":"num"},{"t":"else"}],"checkall":"true","repair":false,"outputs":2,"x":570,"y":640,"wires":[["05f6a8f4de0dd2a2"],["8b7607ab1faae731"]]},{"id":"05f6a8f4de0dd2a2","type":"change","z":"bb4a805c51d73376","name":"Set 1","rules":[{"t":"set","p":"payload","pt":"msg","to":"1","tot":"num"}],"action":"","property":"","from":"","to":"","reg":false,"x":710,"y":620,"wires":[["32ef2a70959a740f"]]},{"id":"8b7607ab1faae731","type":"change","z":"bb4a805c51d73376","name":"Set 0","rules":[{"t":"set","p":"payload","pt":"msg","to":"0","tot":"num"}],"action":"","property":"","from":"","to":"","reg":false,"x":710,"y":660,"wires":[["32ef2a70959a740f"]]},{"id":"2f2869b949f24893","type":"function","z":"bb4a805c51d73376","name":"function 1","func":"if ( msg.payload > 57 ) { msg = 1; }\nelse { msg = 0; }\nreturn msg;\n","outputs":1,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":640,"y":740,"wires":[[]]},{"id":"32ef2a70959a740f","type":"junction","z":"bb4a805c51d73376","x":800,"y":640,"wires":[[]]}]
8

Your first post gave me two things. Firstly I could get data output from the node I wanted it from, even if I didn’t know how. The second was that I did indeed need to know Javascript and have already started this process.

9

After receiving a suggestion from a member, that was later deleted, to look at a condition statement, I followed a more detailed approach to diverting excess solar energy once my batteries got to either Absorption or Float state. These batteries are VRLA and their charging voltage under either of the two mentioned states varies by battery temperature. (Battery temperature adjustment is not applicable for lithium batteries).
A timer is added for evaluating the algorithm, presently set at 2 seconds. A Solid State Relay is able to handle these changes, whereas a Contactor with electromagnetic properties can suffer from contact degradation.
The purpose was to minimise draw from the batteries and as a consequence will extent battery life.
I am only part way through learning Javascript, so in essence a novice beginner, but in spite of myself I managed to get this Function node to work.

I will need to monitor the heat dissipation of the SRR with a temperature data logger but I do not expect an issue. Certainly the 25A SSR on my 3 group coffee boiler which cycles at 135 cycles per minute under the PID controller did not show heat dissipation issues.

[{
        "id": "09f193279e87f963",
        "type": "tab",
        "label": "Absorption Relay Trigger",
        "disabled": false,
        "info": "",
        "env": []
    },
    {
        "id": "efd24cb7f2dcf7de",
        "type": "victron-input-solarcharger",
        "z": "09f193279e87f963",
        "service": "com.victronenergy.solarcharger/288",
        "path": "/State",
        "serviceObj": {
            "service": "com.victronenergy.solarcharger/288",
            "name": "Solar Trina Panel",
            "communityTag": "solarcharger"
        },
        "pathObj": {
            "path": "/State",
            "type": "enum",
            "name": "Charge state",
            "enum": {
                "0": "Off",
                "2": "Fault",
                "3": "Bulk",
                "4": "Absorption",
                "5": "Float",
                "6": "Storage",
                "7": "Equalize",
                "245": "Off",
                "247": "Equalize",
                "252": "External Control"
            }
        },
        "name": "TR C/State",
        "onlyChanges": false,
        "roundValues": "no",
        "rateLimit": "2",
        "outputs": 1,
        "conditionalMode": false,
        "outputTrue": "true",
        "outputFalse": "false",
        "debounce": "2000",
        "x": 80,
        "y": 40,
        "wires": [
            [
                "3aa4465902983b86"
            ]
        ]
    },
    {
        "id": "54c771e5b3a741de",
        "type": "victron-output-relay",
        "z": "09f193279e87f963",
        "service": "com.victronenergy.system/0",
        "path": "/Relay/1/State",
        "serviceObj": {
            "service": "com.victronenergy.system/0",
            "name": "Venus device"
        },
        "pathObj": {
            "path": "/Relay/1/State",
            "type": "enum",
            "name": "Venus relay 2 state",
            "enum": {
                "0": "Open",
                "1": "Closed"
            },
            "mode": "both"
        },
        "initial": 0,
        "name": "GX Relay2",
        "onlyChanges": false,
        "roundValues": "no",
        "rateLimit": 0,
        "outputs": 0,
        "conditionalMode": false,
        "condition1Operator": ">",
        "condition2Enabled": false,
        "condition2Service": "",
        "condition2Path": "",
        "condition2Operator": ">",
        "logicOperator": "AND",
        "outputTrue": "true",
        "outputFalse": "false",
        "outputOnChange": false,
        "debounce": 2000,
        "x": 730,
        "y": 380,
        "wires": []
    },
    {
        "id": "4d2ad28c3b4486d4",
        "type": "debug",
        "z": "09f193279e87f963",
        "name": "AbsVoltTemp debug",
        "active": false,
        "tosidebar": true,
        "console": false,
        "tostatus": false,
        "complete": "payload",
        "targetType": "msg",
        "statusVal": "",
        "statusType": "auto",
        "x": 620,
        "y": 180,
        "wires": []
    },
    {
        "id": "3fc571a974b7f7c7",
        "type": "victron-input-battery",
        "z": "09f193279e87f963",
        "service": "com.victronenergy.battery/279",
        "path": "/Dc/0/Temperature",
        "serviceObj": {
            "service": "com.victronenergy.battery/279",
            "name": "Shunt Yuasa 533ah",
            "communityTag": "battery"
        },
        "pathObj": {
            "path": "/Dc/0/Temperature",
            "type": "float",
            "name": "Battery temperature (°C)"
        },
        "name": "Shunt Temp",
        "onlyChanges": false,
        "roundValues": "no",
        "rateLimit": "2",
        "outputs": 1,
        "conditionalMode": false,
        "outputTrue": "true",
        "outputFalse": "false",
        "debounce": "2000",
        "x": 90,
        "y": 220,
        "wires": [
            [
                "d70b09f208325fe6",
                "55e013630bfba5e2"
            ]
        ]
    },
    {
        "id": "55e013630bfba5e2",
        "type": "change",
        "z": "09f193279e87f963",
        "name": " Absorption Voltage Temp Adj.",
        "rules": [
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "35",
                "fromt": "num",
                "to": "56.952",
                "tot": "num"
            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "34",
                "fromt": "num",
                "to": "57.0168",
                "tot": "num"
            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "33",
                "fromt": "num",
                "to": "57.0816",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "32",
                "fromt": "num",
                "to": "57.1464",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "31",
                "fromt": "num",
                "to": "57.2112",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "30",
                "fromt": "num",
                "to": "57.276",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "29",
                "fromt": "num",
                "to": "57.3408",
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            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "28",
                "fromt": "num",
                "to": "57.4056",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "27",
                "fromt": "num",
                "to": "57.4704",
                "tot": "num"
            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "26",
                "fromt": "num",
                "to": "57.5352",
                "tot": "num"
            },
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                "p": "payload",
                "pt": "msg",
                "from": "25",
                "fromt": "num",
                "to": "57.6",
                "tot": "num"
            },
            {
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                "pt": "msg",
                "from": "24",
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            {
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                "pt": "msg",
                "from": "23",
                "fromt": "num",
                "to": "57.7296",
                "tot": "num"
            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "22",
                "fromt": "num",
                "to": "57.7944",
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            },
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                "p": "payload",
                "pt": "msg",
                "from": "21",
                "fromt": "num",
                "to": "57.8592",
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            },
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                "p": "payload",
                "pt": "msg",
                "from": "20",
                "fromt": "num",
                "to": "57.924",
                "tot": "num"
            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "19",
                "fromt": "num",
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                "from": "8",
                "fromt": "num",
                "to": "58.7016",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "7",
                "fromt": "num",
                "to": "58.7664",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "6",
                "fromt": "num",
                "to": "58.8312",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "5",
                "fromt": "num",
                "to": "58.896",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "4",
                "fromt": "num",
                "to": "58.9608",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "3",
                "fromt": "num",
                "to": "59.0256",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "2",
                "fromt": "num",
                "to": "59.0904",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "1",
                "fromt": "num",
                "to": "59.1552",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "0",
                "fromt": "num",
                "to": "59.22",
                "tot": "num"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 350,
        "y": 160,
        "wires": [
            [
                "4d2ad28c3b4486d4",
                "77507bf9233a26cf"
            ]
        ]
    },
    {
        "id": "c75b1c5af0d8310e",
        "type": "function",
        "z": "09f193279e87f963",
        "name": "4 input condition Function",
        "func": "'use Strict';\nlet state = flow.get('state') || 0;\nlet voltage = flow.get('voltage') || 0;\nlet abstempvolt = flow.get('abstempvolt')  || 0;\nlet floattempvolt = flow.get('floattempvolt') || 0;\nlet controla = voltage - (abstempvolt - 0.2);\nlet controlb = voltage - (floattempvolt - 0.2);    \n    \nif (state === 4 && controla > 0) {\n    msg.payload = 1;\n} \nelse\nif (state === 5 && controlb > 0) {\n    msg.payload = 1;\n}\nelse {\n    msg.payload = 0;\n}\n\nreturn msg;",
        "outputs": 1,
        "timeout": 0,
        "noerr": 0,
        "initialize": "",
        "finalize": "",
        "libs": [],
        "x": 490,
        "y": 380,
        "wires": [
            [
                "7feaad870781d4f9",
                "54c771e5b3a741de"
            ]
        ]
    },
    {
        "id": "d70b09f208325fe6",
        "type": "change",
        "z": "09f193279e87f963",
        "name": "Float Voltage Temp Adjustment",
        "rules": [
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "35",
                "fromt": "num",
                "to": "54.522",
                "tot": "num"
            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "34",
                "fromt": "num",
                "to": "54.6168",
                "tot": "num"
            },
            {
                "t": "change",
                "p": "payload",
                "pt": "msg",
                "from": "33",
                "fromt": "num",
                "to": "54.6816",
                "tot": "num"
            },
            {
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                "pt": "msg",
                "from": "32",
                "fromt": "num",
                "to": "54.7464",
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            },
            {
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                "pt": "msg",
                "from": "31",
                "fromt": "num",
                "to": "54.8112",
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            },
            {
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                "p": "payload",
                "pt": "msg",
                "from": "30",
                "fromt": "num",
                "to": "54.876",
                "tot": "num"
            },
            {
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                "pt": "msg",
                "from": "29",
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                "to": "56.0424",
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        "position": 0,
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]

Dashboard view of Relay and other data.pdf (314.6 KB)

I have attached a dashboard screenshot, the flow and the function node script.
Thank you to all who replied