Here is an example combined into one message. Not sure of telegrams formatting the newline may work.
[{"id":"8d31813f.e1cea","type":"inject","z":"2649c9fd.20f3b6","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"36","payloadType":"num","x":100,"y":160,"wires":[["c1efedfc.ede68"]]},{"id":"c1efedfc.ede68","type":"change","z":"2649c9fd.20f3b6","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"battvolt","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":110,"y":240,"wires":[["497bbc0f.902114"]]},{"id":"497bbc0f.902114","type":"join","z":"2649c9fd.20f3b6","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"","count":"2","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":330,"y":260,"wires":[["5be85aec.4b4884"]]},{"id":"d77650ce.8d502","type":"change","z":"2649c9fd.20f3b6","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"powerin","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":110,"y":280,"wires":[["497bbc0f.902114"]]},{"id":"5be85aec.4b4884","type":"function","z":"2649c9fd.20f3b6","name":"Battery Voltage","func":"msg.payload = {\n \"chatId\": \"xxxxx\", \n \"type\":\"message\", \n \"content\":\"Battery Voltage = \" + msg.payload.battvolt + \" V\\n Eskom AC in = \" + msg.payload.powerin + \" W\"};\nreturn msg;\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":540,"y":260,"wires":[["a2328cf5.d40268"]]},{"id":"756c8b3a.0b490c","type":"inject","z":"2649c9fd.20f3b6","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"1000","payloadType":"num","x":100,"y":360,"wires":[["d77650ce.8d502"]]},{"id":"a2328cf5.d40268","type":"debug","z":"2649c9fd.20f3b6","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":760,"y":260,"wires":[]}]