Odd Discharging Forecast

[daniel309]

See the occasional battery "discharge and pause" behavior in the first half of this picture until the sun comes out and pv energy flows.

The battery discharges continuously until empty, not in this erratic behavior. Not sure whats causing this forecast.

Note: This is with PR evcc-io/evcc#28232 applied over evcc v0.303

request

{
  "batteries": [
    {
      "c_max": 4000,
      "c_min": 0,
      "charge_from_grid": true,
      "d_max": 4000,
      "p_a": 0.000263736,
      "s_capacity": 10000,
      "s_initial": 3800,
      "s_max": 10000,
      "s_min": 500
    }
  ],
  "eta_c": 0.9,
  "eta_d": 0.9,
  "grid": {},
  "strategy": {
    "charging_strategy": "charge_before_export",
    "discharging_strategy": "discharge_before_import"
  },
  "time_series": {
    "dt": [777, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900, 900],
    "ft": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2.7625, 8.2875, 13.8125, 19.3375, 39.275, 73.625, 107.975, 142.325, 185.13594, 236.4078, 287.6797, 338.95157, 386.79688, 431.21564, 475.63437, 520.0531, 556.7344, 585.6781, 614.6219, 643.5656, 668.7953, 690.3109, 711.82654, 733.34216, 752.4203, 769.0609, 785.70154, 802.34216, 810.6766, 810.7047, 810.7328, 810.7609, 799.5031, 776.95935, 754.41565, 731.8719, 698.6766, 654.8297, 610.9828, 567.1359, 511.09375, 442.85626, 374.61874, 306.38126, 244.09843, 187.77031, 131.44218, 75.11406, 41.08125, 29.34375, 17.60625, 5.86875, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
    "gt": [194.66876, 267.04294, 324.52704, 342.78836, 289.85065, 216.35797, 237.52328, 288.01907, 351.75827, 342.37262, 241.46385, 191.95416, 200.04648, 243.51773, 300.05737, 339.71603, 337.5244, 262.31705, 203.78531, 205.69736, 259.09467, 387.13297, 484.85406, 718.26416, 442.898, 193.47525, 185.9737, 182.69067, 184.18051, 192.07237, 227.90776, 273.05637, 371.91202, 210.28932, 178.37683, 174.99068, 250.93228, 236.7413, 262.4161, 225.76202, 203.48376, 191.11847, 222.2031, 250.03563, 299.79453, 333.14102, 245.80728, 206.1322, 258.93408, 181.95251, 206.52028, 208.35909, 188.42015, 242.00114, 528.65295, 738.62805, 380.84933, 250.93982, 292.9332, 333.60794, 278.241, 244.70517, 284.0893, 231.52377, 203.02548, 180.73141, 178.27985, 172.83762, 215.09435, 216.86256, 337.90204, 204.75424, 168.39444, 170.00612, 177.14575, 186.92181, 215.71999, 213.83536, 212.04207, 264.59894, 262.8205, 255.93968, 241.54196, 223.1098, 225.69745, 411.40103, 334.02512, 265.26453, 256.76175, 291.4222, 286.82288, 258.57898, 294.21338, 376.03888, 256.61383, 217.48152, 230.28511, 276.2305, 337.40213, 357.8673, 303.40076, 226.00783],
    "p_E": [0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084, 0.000084],
    "p_N": [0.0003373, 0.00032, 0.0003228, 0.0003129, 0.000303, 0.000296, 0.0003479, 0.0003249, 0.0003156, 0.0003124, 0.0003165, 0.000316, 0.0003161, 0.0003138, 0.0003178, 0.0003178, 0.0003162, 0.0003146, 0.0003161, 0.0003164, 0.0003176, 0.0003168, 0.0003218, 0.0003201, 0.0003197, 0.000322, 0.0003183, 0.0003208, 0.000337, 0.0003544, 0.0003468, 0.0003613, 0.0003726, 0.0003834, 0.000397, 0.0003969, 0.0003972, 0.0003683, 0.0004192, 0.0003806, 0.0003568, 0.0003292, 0.0003684, 0.0003412, 0.0003233, 0.0003175, 0.0003458, 0.0003144, 0.0003071, 0.0003097, 0.0003128, 0.0003078, 0.0003062, 0.0003123, 0.0003034, 0.0003034, 0.0003034, 0.0003029, 0.0003054, 0.0003055, 0.0003042, 0.0003053, 0.0003049, 0.0003093, 0.0003073, 0.0003111, 0.0003086, 0.0003156, 0.0003278, 0.0003415, 0.0003229, 0.000338, 0.0003523, 0.0003739, 0.0003423, 0.0003645, 0.0003841, 0.0004409, 0.0004176, 0.0004421, 0.0004458, 0.000441, 0.0004442, 0.0004031, 0.0003636, 0.0003599, 0.0003844, 0.0003626, 0.0003544, 0.000345, 0.0003628, 0.0003509, 0.0003405, 0.0003233, 0.0003491, 0.0003319, 0.0003157, 0.0003069, 0.0003187, 0.0003109, 0.0003067, 0.0003016]
  }
}

response

{
  "batteries": [
    {
      "charging_power": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10.64578, 84.19594, 147.8331, 164.59378, 181.18001, 175.83984, 186.91208, 310.92712, 379.5459, 355.6878, 461.6131, 462.27502, 481.9518, 523.4064, 491.34103, 223.76735, 30.43285, 404.8522, 551.40234, 517.7434, 477.09677, 532.4918, 566.0557, 515.4138, 545.4356, 551.3902, 551.1405, 520.3967, 149.98763, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
      "discharging_power": [194.66876, 0, 279.44928, 0, 0, 0, 237.52328, 288.01907, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 184.18051, 192.07237, 225.14526, 264.76886, 358.09952, 190.95181, 139.10184, 101.36568, 142.95728, 94.4163, 77.28016, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 84.27781, 138.7213, 170.96082, 235.25519, 245.21425, 250.07092, 241.54196, 223.1098, 225.69745, 411.40103, 334.02512, 265.26453, 256.76175, 291.4222, 286.82288, 258.57898, 294.21338, 376.03888, 256.61383, 217.48152, 230.28511, 276.2305, 337.40213, 357.8673, 303.40076, 226.00783],
      "state_of_charge": [3583.7014, 3583.7014, 3273.2021, 3273.2021, 3273.2021, 3273.2021, 3009.2874, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2689.266, 2484.621, 2271.2075, 2021.0461, 1726.8584, 1328.9701, 1116.8014, 962.2438, 849.6153, 690.77386, 585.8668, 500, 509.5812, 585.35754, 718.40735, 866.54175, 1029.6038, 1187.8596, 1356.0804, 1635.9149, 1977.5062, 2297.6252, 2713.077, 3129.1245, 3562.881, 4033.947, 4476.154, 4677.5444, 4704.934, 5069.301, 5565.563, 6031.532, 6460.9194, 6940.162, 7449.612, 7913.4844, 8404.377, 8900.628, 9396.654, 9865.011, 10000, 10000, 10000, 10000, 10000, 10000, 10000, 10000, 10000, 9906.358, 9752.224, 9562.267, 9300.872, 9028.412, 8750.556, 8482.176, 8234.275, 7983.5005, 7526.388, 7155.2495, 6860.5107, 6575.22, 6251.4175, 5932.7256, 5645.4155, 5318.5117, 4900.691, 4615.5645, 4373.918, 4118.046, 3811.123, 3436.2317, 3038.6016, 2701.4895, 2450.3696]
    }
  ],
  "flow_direction": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  "grid_export": [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 332.00446, 395.88846, 350.27335, 173.19171, 238.10202, 206.2243, 136.37514, 66.95268, 0.8485, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  "grid_import": [0, 267.04294, 45.07775, 342.78836, 289.85065, 216.35797, 0, 0, 351.75827, 342.37262, 241.46385, 191.95416, 200.04648, 243.51773, 300.05737, 339.71603, 337.5244, 262.31705, 203.78531, 205.69736, 259.09467, 387.13297, 484.85406, 718.26416, 442.898, 193.47525, 185.9737, 182.69067, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
  "limit_violations": {},
  "objective_value": -2.4277856,
  "status": "Optimal"
}

[daniel309]

not a bug. the battery is held discharging at cheapest grid price and discharges completely once price goes up again.

all good. closing as "not a bug"

[daniel309]

for reference, here is a similar plan.

that little "stray" discharge blib is explained by grid cost slightly going up at that time, and thats compensated by not using grid but battery instead for that one slot. price went down again right after and optimizer decided to hold battery.

so all optimal and good.