The join output is a key/value object (array). As I did not find a way on how the V1 chart can process this, I changed the 3 values with inverted sign inside the zoom to 3 individual msg.payload with own topic each.
The 9 value radar chart is doing the same. Device 1-8 from the array are copied into individual msg.payload with own topic L/X(Master/Slave/Y what appear as labels in the diagram.
[{"id":"066565bb2de6182b","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/0/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/0/Ac/In/P","name":"/Devices/0/Ac/In/P","type":"number","value":-2883},"name":"Dev0","onlyChanges":false,"x":90,"y":4180,"wires":[["7def4fd9e37cfdd8"]]},{"id":"d372aac64af3b599","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/1/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/1/Ac/In/P","name":"/Devices/1/Ac/In/P","type":"number","value":-3003},"name":"Dev1","onlyChanges":false,"x":90,"y":4240,"wires":[["7def4fd9e37cfdd8"]]},{"id":"7baca92790433a21","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/2/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/2/Ac/In/P","name":"/Devices/2/Ac/In/P","type":"number","value":-2951},"name":"Dev2","onlyChanges":false,"x":90,"y":4300,"wires":[["7def4fd9e37cfdd8"]]},{"id":"13ede845a536f68e","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/6/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/6/Ac/In/P","name":"/Devices/6/Ac/In/P","type":"number","value":-2256},"name":"Dev6","onlyChanges":false,"x":90,"y":4540,"wires":[["7def4fd9e37cfdd8"]]},{"id":"ddf7d4d560df2a06","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/7/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/7/Ac/In/P","name":"/Devices/7/Ac/In/P","type":"number","value":-2252},"name":"Dev7","onlyChanges":false,"x":90,"y":4600,"wires":[["7def4fd9e37cfdd8"]]},{"id":"b8af945e1718ab4c","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/8/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/8/Ac/In/P","name":"/Devices/8/Ac/In/P","type":"number","value":-2566},"name":"Dev8","onlyChanges":false,"x":90,"y":4660,"wires":[["7def4fd9e37cfdd8"]]},{"id":"3bd082dc9ac5d0ec","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/3/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/3/Ac/In/P","name":"/Devices/3/Ac/In/P","type":"number","value":-2881},"name":"Dev3","onlyChanges":false,"x":90,"y":4360,"wires":[["7def4fd9e37cfdd8"]]},{"id":"63b8ba0413bbf27b","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/4/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/4/Ac/In/P","name":"/Devices/4/Ac/In/P","type":"number","value":-2780},"name":"Dev4","onlyChanges":false,"x":90,"y":4420,"wires":[["7def4fd9e37cfdd8"]]},{"id":"b30ec91b08b9a2f1","type":"victron-input-custom","z":"dc5e4f93c45afcbe","service":"com.victronenergy.vebus/276","path":"/Devices/5/Ac/In/P","serviceObj":{"service":"com.victronenergy.vebus/276","name":"MultiPlus-II 48/5000/70-50 (276)"},"pathObj":{"path":"/Devices/5/Ac/In/P","name":"/Devices/5/Ac/In/P","type":"number","value":-2519},"name":"Dev5","onlyChanges":false,"x":90,"y":4480,"wires":[["7def4fd9e37cfdd8"]]},{"id":"7def4fd9e37cfdd8","type":"join","z":"dc5e4f93c45afcbe","name":"","mode":"custom","build":"object","property":"payload","propertyType":"msg","key":"topic","joiner":"\\n","joinerType":"str","accumulate":false,"timeout":"6","count":"9","reduceRight":false,"reduceExp":"","reduceInit":"","reduceInitType":"","reduceFixup":"","x":310,"y":4420,"wires":[["82d5ca1b62a4d766"]]},{"id":"12aa05c0c0697ff2","type":"ui_chart","z":"dc5e4f93c45afcbe","name":"","group":"5d6aa5fa2cd38a95","order":8,"width":0,"height":0,"label":"Multiplus Lastverteilung","chartType":"radar","legend":"false","xformat":"HH:mm:ss","interpolate":"linear","nodata":"","dot":false,"ymin":"","ymax":"","removeOlder":1,"removeOlderPoints":"","removeOlderUnit":"3600","cutout":0,"useOneColor":false,"useUTC":false,"colors":["#1f77b4","#aec7e8","#ff7f0e","#2ca02c","#98df8a","#d62728","#ff9896","#9467bd","#c5b0d5"],"outputs":1,"useDifferentColor":false,"className":"","x":830,"y":4420,"wires":[[]]},{"id":"82d5ca1b62a4d766","type":"function","z":"dc5e4f93c45afcbe","name":"Topics Dev1-8","func":"msg1 = {\"payload\" : msg.payload.Dev0 *-1,\n \"topic\" : \"L1Master\"};\n\nmsg2 = {\"payload\" : msg.payload.Dev1 *-1,\n \"topic\" : \"L1Slave1\"};\n\nmsg3 = {\"payload\" : msg.payload.Dev2 *-1,\n \"topic\" : \"L1Slave2\"};\n\nmsg4 = {\"payload\" : msg.payload.Dev3 *-1,\n \"topic\" : \"L2Master\"};\n\nmsg5 = {\"payload\" : msg.payload.Dev4 *-1,\n \"topic\" : \"L2Slave1\"};\n\nmsg6 = {\"payload\" : msg.payload.Dev5 *-1,\n \"topic\" : \"L2Slave2\"};\n\nmsg7 = {\"payload\" : msg.payload.Dev6 *-1,\n \"topic\" : \"L3Master\"};\n\nmsg8 = {\"payload\" : msg.payload.Dev7 *-1,\n \"topic\" : \"L3Slave1\"};\n\nmsg9 = {\"payload\" : msg.payload.Dev8 *-1,\n \"topic\" : \"L3Slave2\"};\n\nreturn [msg1,msg2,msg3,msg4,msg5,msg6,msg7,msg8,msg9];\n","outputs":9,"timeout":0,"noerr":0,"initialize":"","finalize":"","libs":[],"x":540,"y":4420,"wires":[["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"],["12aa05c0c0697ff2"]]},{"id":"b250ef14f4f0e9e5","type":"comment","z":"dc5e4f93c45afcbe","name":"Multiplus Lastverteilung","info":"","x":340,"y":4240,"wires":[]},{"id":"5d6aa5fa2cd38a95","type":"ui_group","name":"Spalte1","tab":"52c4a1be8450fe1a","order":1,"disp":false,"width":"6","collapse":false,"className":""},{"id":"52c4a1be8450fe1a","type":"ui_tab","name":"Gottlieb-Daimler-Microgrid","icon":"dashboard","disabled":false,"hidden":false}]