Queries UPS over modbus, calculates current draw in watts and logs to es

apcWatts.py

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+# https://download.schneider-electric.com/files?p_enDocType=Quick+start+guide&p_File_Name=990-9840B-EN.pdf&p_Doc_Ref=SPD_LFLG-A32G3L_EN
+
+import time
+from pyModbusTCP.client import ModbusClient
+from utils import getConfig
+from logger import logger
+
+config = getConfig()
+host = config['modbus']['host']
+port = config['modbus']['port']
+c = ModbusClient(host=host port=port, unit_id=1, auto_open=True)
+
+def getAmps():
+  amps = c.read_holding_registers(140, 1)
+  if amps:
+    return amps[0] / 32
+  else:
+    return getAmps()
+
+def getVolts():
+  volts = c.read_holding_registers(142, 1)
+  if volts:
+    return volts[0] / 64
+  else:
+    return getVolts()
+
+def watts():
+  return getVolts() * getAmps()
+
+while True:
+  currentWatts = watts()
+  print('Current power draw: {:.2f}W'.format(currentWatts))
+
+  telemetry = { 'watts': currentWatts }
+
+  logger.info("Current power draw", es=telemetry)
+  time.sleep(1)
+