# Adding measurements is not equal to total

I have a primary wire A which is split into two circuits (B and C) through a circuit breaker. When I put a sensor on all tree wires the power B + C does not equal A. There is a difference of about 1%, is this normal ? It’s worse when I sum more powers, so for example when I put a sensor on every branche and add those together and compare it with the main supply wire.

I would need more details to put your observations into context. For instance I don’t know what CTs you are using, what power you are measuring, and for what duration. Screen shots of the the inputs setup and plots of Watts over some interval with the statistics tab selected would help.

For wire A (the total) I use an AcuCT-H063-100 whereas for wires B and C I use AcuCT-H040-50. I’m just measuring Watts. I’ll try to attach a screenshot, but I’ll paste the csv data here already. It’s B, C, A and last column is (B + C) - A. Most of the time the difference is about 7 W, but there are instances where it goes up to almost 400 W.
2023-11-13 00:00:00, 76.6, 53.6, 137.1, -6.9
2023-11-13 00:05:00, 76.3, 61.0, 143.9, -6.6
2023-11-13 00:10:00, 71.9, 91.8, 170.7, -7.0
2023-11-13 00:15:00, 56.7, 91.7, 155.2, -6.8
2023-11-13 00:20:00, 56.6, 88.7, 152.2, -6.8
2023-11-13 00:25:00, 56.6, 56.4, 119.4, -6.5
2023-11-13 00:30:00, 56.6, 46.4, 109.5, -6.6
2023-11-13 00:35:00, 185.9, 47.4, 237.5, -4.3
2023-11-13 00:40:00, 181.2, 47.5, 233.6, -4.9
2023-11-13 00:45:00, 176.9, 46.6, 228.2, -4.7
2023-11-13 00:50:00, 96.7, 46.7, 149.3, -5.8
2023-11-13 00:55:00, 56.9, 46.7, 109.9, -6.4
2023-11-13 01:00:00, 56.7, 46.8, 110.1, -6.6
2023-11-13 01:05:00, 79.3, 47.0, 133.3, -6.9
2023-11-13 01:10:00, 81.6, 47.3, 135.9, -7.0
2023-11-13 01:15:00, 82.3, 49.4, 138.7, -7.0
2023-11-13 01:20:00, 82.5, 48.3, 137.6, -6.8
2023-11-13 01:25:00, 81.8, 47.5, 136.2, -7.0
2023-11-13 01:30:00, 79.7, 48.0, 134.4, -6.8
2023-11-13 01:35:00, 78.4, 48.4, 133.5, -6.7
2023-11-13 01:40:00, 77.7, 55.6, 140.1, -6.8
2023-11-13 01:45:00, 77.6, 90.5, 175.0, -6.9
2023-11-13 01:50:00, 77.2, 88.9, 173.1, -7.0
2023-11-13 01:55:00, 76.4, 85.7, 169.1, -7.1
2023-11-13 02:00:00, 66.6, 52.4, 125.6, -6.6
2023-11-13 02:05:00, 56.3, 45.8, 108.6, -6.5
2023-11-13 02:10:00, 56.2, 45.4, 108.1, -6.4
2023-11-13 02:15:00, 56.2, 45.4, 107.9, -6.3
2023-11-13 02:20:00, 56.1, 46.2, 108.7, -6.4
2023-11-13 02:25:00, 56.5, 46.3, 109.0, -6.2
2023-11-13 02:30:00, 57.0, 45.6, 108.8, -6.2
2023-11-13 02:35:00, 56.8, 46.0, 109.0, -6.2
2023-11-13 02:40:00, 94.2, 50.0, 148.2, -4.1
2023-11-13 02:45:00, 189.9, 49.8, 244.2, -4.5
2023-11-13 02:50:00, 179.9, 49.8, 234.5, -4.7
2023-11-13 02:55:00, 187.2, 48.9, 241.2, -5.0
2023-11-13 03:00:00, 81.6, 48.7, 136.9, -6.6
2023-11-13 03:05:00, 82.6, 48.4, 137.6, -6.6
2023-11-13 03:10:00, 82.8, 47.8, 137.3, -6.7
2023-11-13 03:15:00, 82.3, 48.5, 137.4, -6.6
2023-11-13 03:20:00, 80.2, 73.0, 160.8, -7.6
2023-11-13 03:25:00, 79.2, 90.1, 176.1, -6.8
2023-11-13 03:30:00, 78.6, 88.4, 174.0, -7.0
2023-11-13 03:35:00, 78.4, 75.1, 160.4, -6.9
2023-11-13 03:40:00, 77.4, 47.1, 131.0, -6.5
2023-11-13 03:45:00, 76.9, 47.8, 131.1, -6.5
2023-11-13 03:50:00, 73.7, 47.7, 128.0, -6.5
2023-11-13 03:55:00, 56.9, 46.8, 109.9, -6.2
2023-11-13 04:00:00, 57.0, 47.1, 110.3, -6.1
2023-11-13 04:05:00, 57.3, 47.0, 110.5, -6.3
2023-11-13 04:10:00, 59.9, 46.9, 113.2, -6.4
2023-11-13 04:15:00, 57.7, 46.7, 110.7, -6.3
2023-11-13 04:20:00, 57.3, 46.5, 110.1, -6.3
2023-11-13 04:25:00, 57.3, 46.6, 110.0, -6.1
2023-11-13 04:30:00, 57.2, 46.1, 109.3, -6.0
2023-11-13 04:35:00, 57.1, 46.2, 109.5, -6.1
2023-11-13 04:40:00, 57.1, 46.9, 110.1, -6.1
2023-11-13 04:45:00, 65.3, 46.4, 117.9, -6.2
2023-11-13 04:50:00, 81.3, 46.3, 134.0, -6.4
2023-11-13 04:55:00, 86.5, 45.9, 137.8, -5.5
2023-11-13 05:00:00, 224.4, 76.4, 305.6, -4.9
2023-11-13 05:05:00, 225.9, 85.3, 315.9, -4.7
2023-11-13 05:10:00, 221.9, 84.1, 311.0, -5.0
2023-11-13 05:15:00, 136.1, 67.0, 209.6, -6.5
2023-11-13 05:20:00, 98.5, 47.1, 152.7, -7.0
2023-11-13 05:25:00, 98.5, 52.3, 157.6, -6.9
2023-11-13 05:30:00, 98.1, 49.1, 154.2, -7.1
2023-11-13 05:35:00, 97.1, 51.9, 156.0, -7.0
2023-11-13 05:40:00, 96.4, 52.6, 155.8, -6.8
2023-11-13 05:45:00, 76.9, 50.8, 134.4, -6.7
2023-11-13 05:50:00, 105.7, 56.2, 168.8, -7.0
2023-11-13 05:55:00, 169.6, 53.8, 230.3, -6.8
2023-11-13 06:00:00, 137.2, 57.9, 199.0, -4.0
2023-11-13 06:05:00, 516.7, 50.1, 569.3, -2.6
2023-11-13 06:10:00, 164.5, 54.7, 226.8, -7.6
2023-11-13 06:15:00, 196.3, 62.1, 263.8, -5.4
2023-11-13 06:20:00, 79.0, 617.7, 689.2, 7.5
2023-11-13 06:25:00, 80.1, 130.5, 216.1, -5.5
2023-11-13 06:30:00, 78.8, 307.8, 390.1, -3.5
2023-11-13 06:35:00, 81.1, 156.0, 247.0, -10.0
2023-11-13 06:40:00, 100.7, 450.8, 559.3, -7.8
2023-11-13 06:45:00, 103.5, 165.8, 273.5, -4.2
2023-11-13 06:50:00, 104.0, 143.2, 252.5, -5.3
2023-11-13 06:55:00, 112.2, 87.4, 205.4, -5.9
2023-11-13 07:00:00, 213.2, 77.0, 297.7, -7.4
2023-11-13 07:05:00, 181.9, 83.3, 272.3, -7.1
2023-11-13 07:10:00, 152.0, 74.7, 232.8, -6.0
2023-11-13 07:15:00, 223.6, 58.9, 286.9, -4.4
2023-11-13 07:20:00, 228.0, 52.9, 285.9, -5.0
2023-11-13 07:25:00, 220.6, 52.4, 278.2, -5.2
2023-11-13 07:30:00, 104.4, 52.1, 163.9, -7.4
2023-11-13 07:35:00, 88.5, 52.6, 148.0, -6.9
2023-11-13 07:40:00, 179.9, 54.1, 240.8, -6.8
2023-11-13 07:45:00, 132.8, 58.4, 198.5, -7.3
2023-11-13 07:50:00, 119.0, 79.8, 205.9, -7.1
2023-11-13 07:55:00, 104.2, 89.3, 200.5, -7.1
2023-11-13 08:00:00, 256.4, 106.7, 367.6, -4.5
2023-11-13 08:05:00, 76.3, 125.1, 207.4, -6.1
2023-11-13 08:10:00, 75.2, 133.7, 216.1, -7.2
2023-11-13 08:15:00, 74.9, 129.2, 211.2, -7.0
2023-11-13 08:20:00, 73.9, 124.8, 205.0, -6.4
2023-11-13 08:25:00, 73.5, 88.5, 168.6, -6.7
2023-11-13 08:30:00, 93.8, 83.3, 184.1, -6.9
2023-11-13 08:35:00, 98.4, 83.2, 188.1, -6.5
2023-11-13 08:40:00, 99.2, 83.2, 189.5, -7.1
2023-11-13 08:45:00, 100.3, 74.8, 182.0, -6.9
2023-11-13 08:50:00, 100.5, 75.8, 183.3, -7.0
2023-11-13 08:55:00, 97.2, 74.1, 178.4, -7.2
2023-11-13 09:00:00, 96.8, 88.1, 191.7, -6.8
2023-11-13 09:05:00, 114.3, 455.0, 581.3, -12.0
2023-11-13 09:10:00, 162.2, 330.5, 499.3, -6.6
2023-11-13 09:15:00, 87.9, 100.3, 195.9, -7.7
2023-11-13 09:20:00, 149.7, 110.4, 257.5, 2.6
2023-11-13 09:25:00, 207.7, 84.6, 299.5, -7.2
2023-11-13 09:30:00, 285.6, 84.7, 373.3, -3.1
2023-11-13 09:35:00, 802.8, 120.4, 933.2, -10.0
2023-11-13 09:40:00, 1951.0, 107.3, 2079.1, -20.9
2023-11-13 09:45:00, 251.1, 93.6, 349.4, -4.8
2023-11-13 09:50:00, 66.4, 57.2, 76.3, 47.3
2023-11-13 09:55:00, 69.9, 43.2, 98.2, 14.9
2023-11-13 10:00:00, 177.8, 36.6, 215.6, -1.1
2023-11-13 10:05:00, 118.3, 35.6, 159.7, -5.9
2023-11-13 10:10:00, 71.2, 60.9, 31.5, 100.6
2023-11-13 10:15:00, 235.4, 60.7, 184.5, 111.6
2023-11-13 10:20:00, 86.1, 72.1, 33.1, 125.1
2023-11-13 10:25:00, 181.4, 116.8, 106.4, 191.7
2023-11-13 10:30:00, 177.8, 85.3, 103.4, 159.7
2023-11-13 10:35:00, 92.6, 26.5, 72.8, 46.3
2023-11-13 10:40:00, 163.6, 59.4, 110.5, 112.6
2023-11-13 10:45:00, 107.3, 44.4, 68.6, 83.1
2023-11-13 10:50:00, 84.4, 76.3, 19.5, 141.2
2023-11-13 10:55:00, 84.2, 77.4, 17.7, 143.9
2023-11-13 11:00:00, 82.6, 61.1, 136.8, 6.9
2023-11-13 11:05:00, 83.7, 104.9, 195.6, -6.9
2023-11-13 11:10:00, 81.4, 94.9, 183.3, -7.0
2023-11-13 11:15:00, 74.2, 85.3, 166.3, -6.8
2023-11-13 11:20:00, 85.6, 65.1, 157.6, -7.0
2023-11-13 11:25:00, 274.2, 59.7, 337.0, -3.0
2023-11-13 11:30:00, 78.8, 65.5, 152.2, -7.8
2023-11-13 11:35:00, 622.5, 72.8, 704.5, -9.2
2023-11-13 11:40:00, 298.3, 49.8, 312.5, 35.5
2023-11-13 11:45:00, 553.1, 115.1, 452.9, 215.2
2023-11-13 11:50:00, 243.4, 102.7, 198.2, 148.0
2023-11-13 11:55:00, 238.5, 111.3, 214.6, 135.2
2023-11-13 12:00:00, 234.3, 83.7, 206.0, 112.0
2023-11-13 12:05:00, 184.2, 88.3, 133.2, 139.3
2023-11-13 12:10:00, 119.7, 92.6, 48.9, 163.4
2023-11-13 12:15:00, 425.2, 125.2, 367.0, 183.5
2023-11-13 12:20:00, 359.3, 304.2, 540.3, 123.2
2023-11-13 12:25:00, 140.1, 431.7, 429.2, 142.6
2023-11-13 12:30:00, 84.7, 284.3, 257.1, 111.9
2023-11-13 12:35:00, 83.7, 89.6, 21.3, 152.0
2023-11-13 12:40:00, 84.2, 82.2, 18.5, 147.9
2023-11-13 12:45:00, 82.9, 243.8, 206.1, 120.6
2023-11-13 12:50:00, 81.9, 189.6, 116.7, 154.9
2023-11-13 12:55:00, 147.1, 451.4, 485.7, 112.8
2023-11-13 13:00:00, 83.5, 157.4, 69.3, 171.5
2023-11-13 13:05:00, 67.7, 117.5, 44.3, 140.9
2023-11-13 13:10:00, 62.9, 87.6, 28.9, 121.7
2023-11-13 13:15:00, 63.2, 181.5, 120.3, 124.3
2023-11-13 13:20:00, 63.9, 272.3, 202.4, 133.8
2023-11-13 13:25:00, 125.3, 480.0, 416.6, 188.7
2023-11-13 13:30:00, 234.4, 215.7, 108.6, 341.6
2023-11-13 13:35:00, 187.9, 138.1, 58.2, 267.7
2023-11-13 13:40:00, 530.7, 67.0, 569.6, 28.1
2023-11-13 13:45:00, 313.6, 69.2, 388.8, -6.0
2023-11-13 13:50:00, 64.6, 164.7, 237.2, -8.0
2023-11-13 13:55:00, 72.8, 216.8, 297.4, -7.8
2023-11-13 14:00:00, 88.0, 90.1, 183.0, -4.9
2023-11-13 14:05:00, 89.0, 70.2, 96.8, 62.4
2023-11-13 14:10:00, 89.7, 44.6, 135.5, -1.2
2023-11-13 14:15:00, 90.1, 68.1, 44.4, 113.8
2023-11-13 14:20:00, 89.2, 97.3, 101.7, 84.8
2023-11-13 14:25:00, 86.9, 67.9, 143.7, 11.0
2023-11-13 14:30:00, 85.7, 143.6, 237.1, -7.8
2023-11-13 14:35:00, 85.2, 222.1, 315.5, -8.3
2023-11-13 14:40:00, 84.9, 201.4, 294.5, -8.2
2023-11-13 14:45:00, 84.7, 122.4, 214.8, -7.7
2023-11-13 14:50:00, 85.0, 103.1, 35.5, 152.7
2023-11-13 14:55:00, 133.5, 779.9, 694.9, 218.5
2023-11-13 15:00:00, 65.1, 771.5, 702.8, 133.9
2023-11-13 15:05:00, 65.0, 730.3, 661.8, 133.4
2023-11-13 15:10:00, 65.0, 665.6, 596.5, 134.1
2023-11-13 15:15:00, 65.0, 555.4, 486.2, 134.2
2023-11-13 15:20:00, 65.0, 504.5, 434.2, 135.3
2023-11-13 15:25:00, 147.0, 477.5, 330.3, 294.2
2023-11-13 15:30:00, 191.1, 456.6, 263.0, 384.8
2023-11-13 15:35:00, 187.9, 311.8, 119.9, 379.9
2023-11-13 15:40:00, 162.5, 307.1, 140.1, 329.6
2023-11-13 15:45:00, 338.6, 256.9, 404.2, 191.3
2023-11-13 15:50:00, 255.6, 177.1, 236.8, 195.9
2023-11-13 15:55:00, 234.0, 102.5, 163.5, 173.0
2023-11-13 16:00:00, 299.5, 73.2, 231.7, 141.0
2023-11-13 16:05:00, 294.0, 54.2, 238.2, 110.0
2023-11-13 16:10:00, 350.5, 23.5, 334.0, 40.0
2023-11-13 16:15:00, 278.5, 29.1, 298.6, 9.0
2023-11-13 16:20:00, 310.4, 35.3, 384.0, -38.3
2023-11-13 16:25:00, 322.6, 48.5, 400.3, -29.2
2023-11-13 16:30:00, 1323.8, 75.8, 1418.1, -18.4
2023-11-13 16:35:00, 2136.1, 632.5, 2794.6, -26.0
2023-11-13 16:40:00, 678.7, 444.5, 1136.4, -13.2
2023-11-13 16:45:00, 245.7, 166.1, 424.7, -12.9
2023-11-13 16:50:00, 1462.1, 184.7, 1682.8, -36.0
2023-11-13 16:55:00, 881.0, 201.8, 1102.4, -19.6
2023-11-13 17:00:00, 799.1, 190.6, 999.8, -10.1
2023-11-13 17:05:00, 924.6, 188.6, 1127.6, -14.4
2023-11-13 17:10:00, 1167.6, 183.1, 1367.4, -16.6
2023-11-13 17:15:00, 625.6, 188.8, 831.0, -16.6
2023-11-13 17:20:00, 1737.6, 193.8, 1956.9, -25.5
2023-11-13 17:25:00, 1759.3, 211.4, 1998.6, -27.9
2023-11-13 17:30:00, 1101.9, 207.5, 1316.4, -7.1
2023-11-13 17:35:00, 2062.2, 191.2, 2278.1, -24.7
2023-11-13 17:40:00, 1844.3, 192.2, 2044.2, -7.7
2023-11-13 17:45:00, 1574.2, 191.7, 1785.0, -19.1
2023-11-13 17:50:00, 1403.7, 195.0, 1634.9, -36.2
2023-11-13 17:55:00, 1422.6, 229.9, 1663.2, -10.7
2023-11-13 18:00:00, 385.8, 249.1, 631.8, 3.1
2023-11-13 18:05:00, 210.8, 236.6, 451.2, -3.8
2023-11-13 18:10:00, 112.3, 210.6, 330.8, -8.0
2023-11-13 18:15:00, 98.9, 172.6, 279.9, -8.4
2023-11-13 18:20:00, 225.6, 172.2, 406.7, -9.0
2023-11-13 18:25:00, 287.4, 174.8, 472.0, -9.7
2023-11-13 18:30:00, 154.1, 160.6, 323.0, -8.4
2023-11-13 18:35:00, 109.0, 154.6, 270.9, -7.4
2023-11-13 18:40:00, 105.0, 153.2, 265.4, -7.3
2023-11-13 18:45:00, 94.1, 152.7, 254.0, -7.2
2023-11-13 18:50:00, 544.6, 145.9, 706.7, -16.2
2023-11-13 18:55:00, 448.3, 132.3, 579.5, 1.1
2023-11-13 19:00:00, 450.1, 151.2, 603.1, -1.8
2023-11-13 19:05:00, 314.6, 188.3, 514.0, -11.1
2023-11-13 19:10:00, 315.7, 175.5, 501.8, -10.6
2023-11-13 19:15:00, 292.6, 178.6, 482.0, -10.7
2023-11-13 19:20:00, 312.6, 189.2, 511.3, -9.5
2023-11-13 19:25:00, 317.6, 193.0, 520.7, -10.1
2023-11-13 19:30:00, 437.5, 159.6, 604.8, -7.7
2023-11-13 19:35:00, 456.1, 144.2, 609.7, -9.5
2023-11-13 19:40:00, 986.5, 144.5, 1131.5, -0.5
2023-11-13 19:45:00, 1171.4, 147.5, 1306.7, 12.2
2023-11-13 19:50:00, 944.8, 131.1, 1068.9, 7.0
2023-11-13 19:55:00, 770.3, 1055.2, 1822.5, 3.1
2023-11-13 20:00:00, 1968.8, 911.9, 2904.9, -24.2
2023-11-13 20:05:00, 822.3, 126.4, 963.8, -15.1
2023-11-13 20:10:00, 660.9, 121.3, 793.8, -11.6
2023-11-13 20:15:00, 313.7, 142.1, 464.0, -8.2
2023-11-13 20:20:00, 355.8, 165.3, 524.2, -3.0
2023-11-13 20:25:00, 165.5, 164.6, 338.1, -8.1
2023-11-13 20:30:00, 249.5, 180.1, 442.2, -12.6
2023-11-13 20:35:00, 229.4, 178.4, 417.9, -10.1
2023-11-13 20:40:00, 188.9, 141.1, 338.2, -8.3
2023-11-13 20:45:00, 139.6, 143.1, 290.0, -7.3
2023-11-13 20:50:00, 262.0, 136.4, 404.5, -6.1
2023-11-13 20:55:00, 170.3, 149.3, 325.6, -6.0
2023-11-13 21:00:00, 111.6, 151.2, 269.4, -6.6
2023-11-13 21:05:00, 110.6, 145.0, 263.2, -7.6
2023-11-13 21:10:00, 107.7, 91.8, 206.1, -6.6
2023-11-13 21:15:00, 102.3, 96.8, 206.4, -7.2
2023-11-13 21:20:00, 103.3, 94.9, 204.6, -6.4
2023-11-13 21:25:00, 98.7, 83.9, 190.1, -7.5
2023-11-13 21:30:00, 113.1, 111.1, 233.1, -8.8
2023-11-13 21:35:00, 220.9, 121.8, 352.0, -9.3
2023-11-13 21:40:00, 245.3, 122.4, 373.7, -6.0
2023-11-13 21:45:00, 235.2, 117.4, 358.4, -5.8
2023-11-13 21:50:00, 195.7, 79.3, 280.4, -5.4
2023-11-13 21:55:00, 1961.4, 1412.6, 3395.1, -21.1
2023-11-13 22:00:00, 2916.5, 219.7, 3166.6, -30.5
2023-11-13 22:05:00, 2811.2, 86.5, 2926.9, -29.2
2023-11-13 22:10:00, 3862.6, 88.9, 3988.8, -37.3
2023-11-13 22:15:00, 4666.4, 213.3, 4923.2, -43.5
2023-11-13 22:20:00, 3145.4, 262.1, 3438.0, -30.4
2023-11-13 22:25:00, 2182.8, 259.1, 2466.6, -24.7
2023-11-13 22:30:00, 2158.3, 260.0, 2443.1, -24.8
2023-11-13 22:35:00, 2135.7, 259.0, 2419.7, -25.0
2023-11-13 22:40:00, 2184.2, 259.2, 2468.3, -24.8
2023-11-13 22:45:00, 2215.7, 268.7, 2509.2, -24.7
2023-11-13 22:50:00, 2090.7, 293.5, 2408.2, -24.0
2023-11-13 22:55:00, 2015.4, 203.7, 2242.3, -23.2
2023-11-13 23:00:00, 1886.0, 179.9, 2085.0, -19.1
2023-11-13 23:05:00, 1889.8, 154.4, 2062.4, -18.3
2023-11-13 23:10:00, 1851.9, 127.1, 2001.5, -22.5
2023-11-13 23:15:00, 855.5, 116.3, 986.1, -14.3
2023-11-13 23:20:00, 255.8, 99.8, 364.5, -8.8
2023-11-13 23:25:00, 138.1, 95.4, 242.5, -9.0
2023-11-13 23:30:00, 142.6, 91.4, 243.0, -9.0
2023-11-13 23:35:00, 120.8, 84.7, 212.9, -7.4
2023-11-13 23:40:00, 176.4, 79.9, 261.2, -4.9
2023-11-13 23:45:00, 242.2, 76.1, 322.7, -4.5
2023-11-13 23:50:00, 236.0, 73.3, 315.0, -5.6
2023-11-13 23:55:00, 212.0, 70.8, 287.9, -5.2
2023-11-14 00:00:00, 89.7, 68.4, 164.5, -6.4
2023-11-14 00:05:00, 93.5, 65.5, 165.2, -6.1
2023-11-14 00:10:00, 737.7, 88.8, 834.5, -7.9
2023-11-14 00:15:00, 2140.4, 106.8, 2270.4, -23.2
2023-11-14 00:20:00, 2126.4, 99.7, 2248.9, -22.8
2023-11-14 00:25:00, 2088.3, 95.0, 2206.2, -22.9
2023-11-14 00:30:00, 210.6, 55.4, 274.5, -8.5
2023-11-14 00:35:00, 88.5, 55.7, 151.0, -6.9
2023-11-14 00:40:00, 87.4, 53.8, 148.0, -6.8
2023-11-14 00:45:00, 86.6, 53.2, 146.7, -6.9
2023-11-14 00:50:00, 85.4, 57.2, 149.4, -6.8
2023-11-14 00:55:00, 82.7, 56.6, 145.9, -6.6
2023-11-14 01:00:00, 81.9, 57.2, 145.8, -6.7
2023-11-14 01:05:00, 81.1, 56.8, 144.8, -6.9
2023-11-14 01:10:00, 80.7, 56.7, 144.2, -6.8
2023-11-14 01:15:00, 82.7, 57.2, 146.4, -6.5
2023-11-14 01:20:00, 80.9, 53.7, 141.2, -6.6
2023-11-14 01:25:00, 72.9, 53.0, 132.6, -6.7
2023-11-14 01:30:00, 60.7, 53.0, 120.2, -6.5
2023-11-14 01:35:00, 58.9, 55.1, 120.9, -7.0
2023-11-14 01:40:00, 139.3, 93.1, 237.1, -4.7
2023-11-14 01:45:00, 186.5, 94.9, 286.0, -4.6
2023-11-14 01:50:00, 182.6, 93.1, 280.2, -4.5
2023-11-14 01:55:00, 152.4, 71.4, 228.9, -5.1
2023-11-14 02:00:00, 59.2, 53.7, 119.3, -6.5
2023-11-14 02:05:00, 58.3, 53.4, 118.2, -6.5
2023-11-14 02:10:00, 57.4, 55.2, 119.4, -6.7
2023-11-14 02:15:00, 70.9, 55.3, 133.0, -6.7
2023-11-14 02:20:00, 152.3, 54.7, 214.6, -7.6
2023-11-14 02:25:00, 100.3, 53.5, 160.7, -6.9
2023-11-14 02:30:00, 83.1, 53.8, 143.4, -6.6
2023-11-14 02:35:00, 83.0, 53.3, 143.0, -6.7
2023-11-14 02:40:00, 81.4, 53.2, 141.5, -6.9
2023-11-14 02:45:00, 79.8, 53.2, 139.6, -6.6
2023-11-14 02:50:00, 78.9, 53.7, 139.3, -6.8
2023-11-14 02:55:00, 78.1, 53.6, 138.3, -6.7
2023-11-14 03:00:00, 77.3, 54.2, 138.1, -6.6
2023-11-14 03:05:00, 76.8, 53.8, 137.3, -6.7
2023-11-14 03:10:00, 74.3, 86.4, 167.8, -7.1
2023-11-14 03:15:00, 56.7, 95.8, 158.9, -6.4
2023-11-14 03:20:00, 56.6, 94.1, 157.3, -6.6
2023-11-14 03:25:00, 56.7, 80.6, 144.1, -6.7
2023-11-14 03:30:00, 57.2, 53.4, 116.9, -6.3
2023-11-14 03:35:00, 57.3, 53.3, 117.2, -6.5
2023-11-14 03:40:00, 137.9, 53.5, 196.1, -4.8
2023-11-14 03:45:00, 187.7, 64.8, 257.4, -4.9
2023-11-14 03:50:00, 197.8, 68.9, 271.8, -5.0
2023-11-14 03:55:00, 148.9, 66.5, 220.6, -5.3
2023-11-14 04:00:00, 57.3, 66.8, 130.6, -6.5
2023-11-14 04:05:00, 72.5, 66.8, 146.0, -6.7
2023-11-14 04:10:00, 81.9, 66.1, 154.8, -6.8
2023-11-14 04:15:00, 82.8, 66.7, 156.6, -7.1
2023-11-14 04:20:00, 83.0, 66.8, 156.7, -6.9
2023-11-14 04:25:00, 82.9, 65.8, 155.4, -6.7
2023-11-14 04:30:00, 80.9, 55.8, 143.6, -6.8
2023-11-14 04:35:00, 79.4, 55.3, 141.7, -6.9
2023-11-14 04:40:00, 78.6, 54.0, 139.6, -7.0
2023-11-14 04:45:00, 77.9, 83.0, 168.2, -7.3
2023-11-14 04:50:00, 77.5, 94.6, 179.1, -7.0
2023-11-14 04:55:00, 77.0, 92.8, 176.9, -7.1
2023-11-14 05:00:00, 75.9, 78.6, 161.5, -7.1
2023-11-14 05:05:00, 56.9, 53.8, 117.3, -6.6
2023-11-14 05:10:00, 56.7, 53.2, 116.4, -6.5
2023-11-14 05:15:00, 56.5, 52.9, 116.0, -6.5
2023-11-14 05:20:00, 56.6, 52.8, 115.9, -6.5
2023-11-14 05:25:00, 56.6, 52.8, 115.7, -6.4
2023-11-14 05:30:00, 56.4, 52.7, 115.6, -6.6
2023-11-14 05:35:00, 56.4, 52.8, 115.7, -6.5
2023-11-14 05:40:00, 56.5, 52.8, 115.7, -6.5
2023-11-14 05:45:00, 62.4, 53.1, 123.7, -8.2
2023-11-14 05:50:00, 189.2, 53.4, 247.4, -4.8
2023-11-14 05:55:00, 195.3, 52.9, 253.2, -5.0
2023-11-14 06:00:00, 203.1, 54.1, 262.0, -4.9
2023-11-14 06:05:00, 124.3, 53.7, 184.2, -6.2
2023-11-14 06:10:00, 386.1, 53.3, 450.3, -10.9
2023-11-14 06:15:00, 183.9, 111.1, 303.8, -8.8
2023-11-14 06:20:00, 845.4, 172.2, 1008.0, 9.6
2023-11-14 06:25:00, 328.3, 208.9, 542.3, -5.0
2023-11-14 06:30:00, 171.5, 214.9, 395.4, -9.0
2023-11-14 06:35:00, 204.4, 211.7, 425.0, -8.8
2023-11-14 06:40:00, 911.4, 183.6, 1105.7, -10.7
2023-11-14 06:45:00, 184.8, 173.3, 367.6, -9.5
2023-11-14 06:50:00, 220.5, 171.7, 407.4, -15.3
2023-11-14 06:55:00, 142.9, 450.7, 601.5, -8.0
2023-11-14 07:00:00, 123.1, 749.7, 871.4, 1.5
2023-11-14 07:05:00, 146.7, 230.0, 380.2, -3.5
2023-11-14 07:10:00, 140.3, 155.5, 300.6, -4.9
2023-11-14 07:15:00, 126.0, 149.2, 278.4, -3.2
2023-11-14 07:20:00, 205.7, 106.4, 318.8, -6.7
2023-11-14 07:25:00, 109.7, 105.1, 222.2, -7.4
2023-11-14 07:30:00, 118.5, 153.0, 279.3, -7.7
2023-11-14 07:35:00, 104.5, 163.1, 275.1, -7.5
2023-11-14 07:40:00, 110.2, 158.3, 276.7, -8.2
2023-11-14 07:45:00, 160.4, 160.3, 329.9, -9.2
2023-11-14 07:50:00, 255.7, 152.1, 413.7, -5.9
2023-11-14 07:55:00, 240.1, 142.1, 387.7, -5.4
2023-11-14 08:00:00, 237.0, 124.9, 367.9, -6.1
2023-11-14 08:05:00, 152.0, 118.2, 276.6, -6.5
2023-11-14 08:10:00, 112.8, 113.8, 234.0, -7.4
2023-11-14 08:15:00, 110.4, 106.9, 224.9, -7.7
2023-11-14 08:20:00, 109.5, 102.7, 219.8, -7.6
2023-11-14 08:25:00, 108.5, 101.4, 218.8, -8.8
2023-11-14 08:30:00, 108.0, 100.2, 216.1, -7.9
2023-11-14 08:35:00, 107.8, 91.7, 207.4, -7.9
2023-11-14 08:40:00, 107.3, 91.6, 206.9, -8.1
2023-11-14 08:45:00, 66.2, 108.0, 181.0, -6.8
2023-11-14 08:50:00, 162.4, 134.1, 304.0, -7.5
2023-11-14 08:55:00, 56.6, 142.4, 206.8, -7.8
2023-11-14 09:00:00, 60.9, 143.2, 210.7, -6.7
2023-11-14 09:05:00, 57.6, 122.5, 187.6, -7.5
2023-11-14 09:10:00, 56.2, 587.6, 660.0, -16.2
2023-11-14 09:15:00, 56.6, 185.3, 246.5, -4.5
2023-11-14 09:20:00, 56.6, 73.6, 135.4, -5.1
2023-11-14 09:25:00, 56.7, 63.1, 125.1, -5.3
2023-11-14 09:30:00, 56.7, 50.6, 90.6, 16.6
2023-11-14 09:35:00, 60.4, 27.2, 38.5, 49.1
2023-11-14 09:40:00, 80.2, 25.7, 62.4, 43.5
2023-11-14 09:45:00, 81.5, 62.7, 147.6, -3.4
2023-11-14 09:50:00, 201.0, 75.2, 278.1, -1.9
2023-11-14 09:55:00, 239.7, 70.6, 314.9, -4.7
2023-11-14 10:00:00, 202.3, 90.9, 297.7, -4.6
2023-11-14 10:05:00, 198.5, 94.3, 298.8, -6.0

Still not much information about the circuits you are measuring. There is clearly more to this story than you are presenting.

Although the graph that you posted has the time legend cut off, I’m ASSUMING that it is the same as the CSV that you posted. I’m also ASSUMING from the time that you posted that you are in eastern Europe, and I’m ASSUMING that you are 230V. I have no clues as to whether you are single or three phase or if you have anything like PV generation.

With a loose time scale ASSUMED, It looks to me like of the 34 hours covered, the big variations only occur between 10:00 and 16:00. If this is a commercial environment, I would suspect something that happens during the working day, but as most IoTaWatt are residential, I am suspecting PV generation as a contributor.

The variation outside of those hours are minimal. When you consider that 10 Watts is about 43mA at 230V, which is less than 1% of the range of the 50A CT, and the CTs are +/- 0.5%, I think the variation is pretty good. It’s even holding steady around 22:25 when usage soars to about 5kW.

What is most interesting is that around 15:00, Wire C begins to be greater than the total by itself.

When I stare at that for awhile, I see that the difference calculation is roughly twice the value of wire B. That’s hard to do while wire C is actually greater than the total. Again, I’m working with a lot of ASSUMPTIONS here because you have not put much effort into explaining what you are doing, but IoTaWatt will automatically make a negative input positive unless you explicitly check “allow negative values”. If in fact wire B is going negative (PV or a battery powered inverter?), wire C would show as positive Watts, while the negative current flow would drive wire A down.

1. yes, the graph was the same as the csv
2. yes, it’s eastern Europe with 230 V
3. I’m not sure what you mean with “loose time”, but the time scale was set to auto if that’s what you mean.
4. yes, I have PV’s attached in the circuit

With your comments, I started looking at the setup a bit more closely and noticed I had indeed misplaced the sensors and didn’t enable negative current. So now I got this result which looks pretty ok I guess. When looking at the Watt output, the error (difference_ABC = (B + C) - A) remains below 10 W but I still have a few “outlayers” between 20 and 50 W. Anything I can do about this or is this normal ?

(detail of the difference graph)

Can you zoom in to a one-hour graph on a section that has larger variance and post the same plots?

Here is the section from 9:30 till 10:30 as this one has the biggest variations.

anyone any solutions ?