New feature that allows to limit the max power from the Grid

TWCManager.py

@@ -97,6 +97,16 @@
     debugLog(1, "Unable to find a configuration file.")
     sys.exit()
 
+
+
+
+########################################################################
+# Write the PID in order to let a supervisor restart it in case of crash
+PIDfile=config["config"]["settingsPath"] + "/TWCManager.pid"
+PIDTWCManager=open(PIDfile,"w")
+PIDTWCManager.write(str(os.getpid()))
+PIDTWCManager.close()
+
 # All TWCs ship with a random two-byte TWCID. We default to using 0x7777 as our
 # fake TWC ID. There is a 1 in 64535 chance that this ID will match each real
 # TWC on the network, in which case you should pick a different random id below.
@@ -237,6 +247,9 @@ def background_tasks_thread(master):
                     requests.post(task["url"], json=body)
             elif task["cmd"] == "saveSettings":
                 master.saveSettings()
+            elif task["cmd"] == "checkMaxPowerFromGrid":
+                check_max_power_from_grid()
+
 
         except:
             master.debugLog(
@@ -285,6 +298,24 @@ def check_green_energy():
     master.setMaxAmpsToDivideAmongSlaves(master.getMaxAmpsToDivideGreenEnergy())
 
 
+def check_max_power_from_grid():
+    global config, hass, master
+
+    # Check solar panel generation using an API exposed by
+    # the HomeAssistant API.
+    #
+    # You may need to customize the sensor entity_id values
+    # to match those used in your environment. This is configured
+    # in the config section at the top of this file.
+    #
+    # Poll all loaded EMS modules for consumption and generation values
+    for module in master.getModulesByType("EMS"):
+        master.setConsumption(module["name"], module["ref"].getConsumption())
+        master.setGeneration(module["name"], module["ref"].getGeneration())
+    master.setMaxAmpsToDivideFromGrid(master.getMaxAmpsToDivideFromGrid())
+
+
+
 def update_statuses():
 
     # Print a status update if we are on track green energy showing the

etc/twcmanager/config.json

@@ -32,6 +32,32 @@
         # wiringMaxAmpsPerTWC = 50 * 0.8 = 40 and wiringMaxAmpsAllTWCs = 40 + 40 = 80.
         "wiringMaxAmpsPerTWC": 6,
 
+
+        # If you what to limit the power drawn from the Grid you need to set this
+        # maxAmpsAllowedFromGrid and extend the policy you what it to apply, i.e.:
+        # { "name": "Charge Now with Grid power limit",
+        #   "match": [
+        #       "settings.chargeNowAmps",
+        #       "settings.chargeNowTimeEnd",
+        #       "settings.chargeNowTimeEnd",
+        #   ],
+        #   "condition": ["gt", "gt", "gt"],
+        #   "value": [0, 0, "now"],
+        #   "background_task": "checkMaxPowerFromGrid",
+        #   "charge_amps": "settings.chargeNowAmps",
+        #   "charge_limit": "config.chargeNowLimit"},
+
+        # { "name": "Scheduled Charging with Grid power limit",
+        #   "match": [ "checkScheduledCharging()" ],
+        #   "condition": [ "eq" ],
+        #   "value": [ 1 ],
+        #   "background_task": "checkMaxPowerFromGrid",
+        #   "charge_amps": "settings.scheduledAmpsMax",
+        #   "charge_limit": "config.scheduledLimit"},
+
+        "maxAmpsAllowedFromGrid": 15,
+
+
         # https://teslamotorsclub.com/tmc/threads/model-s-gen2-charger-efficiency-testing.78740/#post-1844789
         # says you're using 10.85% more power (91.75/82.77=1.1085) charging at 5A vs 40A,
         # 2.48% more power at 10A vs 40A, and 1.9% more power at 20A vs 40A.  This is
@@ -258,6 +284,25 @@
         #
         # They should primarily be used to abort charging when necessary.
         "emergency":[
+         { "name": "Charge Now with Grid power limit",
+           "match": [
+               "settings.chargeNowAmps",
+               "settings.chargeNowTimeEnd",
+               "settings.chargeNowTimeEnd",
+           ],
+           "condition": ["gt", "gt", "gt"],
+           "value": [0, 0, "now"],
+           "background_task": "checkMaxPowerFromGrid",
+           "charge_amps": "settings.chargeNowAmps",
+           "charge_limit": "config.chargeNowLimit"},
+
+         { "name": "Scheduled Charging with Grid power limit",
+           "match": [ "checkScheduledCharging()" ],
+           "condition": [ "eq" ],
+           "value": [ 1 ],
+           "background_task": "checkMaxPowerFromGrid",
+           "charge_amps": "settings.scheduledAmpsMax",
+           "charge_limit": "config.scheduledLimit"},
         ],
         # Rules in the before section here are evaluated after the Charge Now rule
         "before":[

lib/TWCManager/Control/themes/Default/jsrefresh.html.j2

@@ -20,7 +20,7 @@ $(document).ready(function() {
                 }
 
                 // Change the state of the Charge Now button based on Charge Policy
-                if (json["currentPolicy"] == "Charge Now") {
+                if (json["currentPolicy"] == "Charge Now" || json["currentPolicy"] == "Charge Now with Grid power limit") {
                   document.getElementById("start_chargenow").value = "Update Charge Now";
                   document.getElementById("cancel_chargenow").disabled = false;
                 } else {

lib/TWCManager/TWCMaster.py

@@ -32,6 +32,7 @@ class TWCMaster:
     lastTWCResponseMsg = None
     masterTWCID = ""
     maxAmpsToDivideAmongSlaves = 0
+    maxAmpsToDivideFromGrid = 0
     modules = {}
     nextHistorySnap = 0
     overrideMasterHeartbeatData = b""
@@ -532,6 +533,29 @@ def getMaxAmpsToDivideGreenEnergy(self):
         amps = amps / self.getRealPowerFactor(amps)
         return round(amps, 2)
 
+    def getMaxAmpsToDivideFromGrid(self):
+        # Calculate our current generation and consumption in watts
+        generationW = float(self.getGeneration())
+        consumptionW = float(self.getConsumption())
+
+        currentOffer = min(
+            self.getTotalAmpsInUse(),
+            self.getMaxAmpsToDivideAmongSlaves(),
+        )
+
+        # Calculate what we should max offer to align with max grid energy
+        amps = self.config["config"]["maxAmpsAllowedFromGrid"] + \
+               self.convertWattsToAmps(generationW - consumptionW) + \
+               currentOffer
+
+        amps = amps / self.getRealPowerFactor(amps)
+        self.debugLog(
+            10, "TWCMaster", "MaxAmpsToDivideFromGrid: +++++++++++++++: " + str(amps)
+        )
+
+        return round(amps, 2)
+
+
     def getNormalChargeLimit(self, ID):
         if "chargeLimits" in self.settings and str(ID) in self.settings["chargeLimits"]:
             result = self.settings["chargeLimits"][str(ID)]
@@ -1167,6 +1191,17 @@ def setMaxAmpsToDivideAmongSlaves(self, amps):
             )
             amps = self.config["config"]["wiringMaxAmpsAllTWCs"]
 
+        activePolicy=str(self.getModuleByName("Policy").active_policy)
+        if (activePolicy== "Charge Now with Grid power limit" or \
+            activePolicy== "Scheduled Charging with Grid power limit") and \
+            amps > self.maxAmpsToDivideFromGrid:
+            # Never tell the slaves to draw more amps from grid than allowed
+            amps = self.maxAmpsToDivideFromGrid
+            self.debugLog(
+                10, "TWCMaster","maxAmpsToDivideAmongSlaves limited to not draw more power from the grid than allowed: " + str(amps)
+            )
+
+
         self.maxAmpsToDivideAmongSlaves = amps
 
         self.releaseBackgroundTasksLock()
@@ -1175,6 +1210,11 @@ def setMaxAmpsToDivideAmongSlaves(self, amps):
         # to console / MQTT / etc
         self.queue_background_task({"cmd": "updateStatus"})
 
+    def setMaxAmpsToDivideFromGrid(self, amps):
+        # This is called when check_max_power_from_grid is run
+        # It stablished how much power we allow getting from the grid
+        self.maxAmpsToDivideFromGrid = amps
+
     def setNonScheduledAmpsMax(self, amps):
         self.settings["nonScheduledAmpsMax"] = amps
 

svisorTWC.sh

@@ -0,0 +1,24 @@
+PROGRAM=/usr/bin/python3.5
+PIDFILE=/etc/twcmanager/TWCManager.pid
+TWCMANAGER_PATH=/home/pi/TWCManager
+
+while true
+do
+
+if [ -f $PIDFILE ]; then
+  read PID <$PIDFILE
+  echo $PID 
+  if [ -d /proc/$PID ] && [ "$(readlink -f /proc/$PID/exe)" = "$PROGRAM" ]; then
+    echo "done."
+  else
+    echo "PID not found, Starting..."
+    screen -dm -S TWCManager $TWCMANAGER_PATH/TWCManager.py
+  fi
+else
+    echo "PID file not found "; echo $PIDFILE; echo ", Starting..."
+    screen -dm -S TWCManager $TWCMANAGER_PATH/TWCManager.py
+fi
+sleep 30
+done
+
+