Feature: DPL: make standby configurable for smart-buffer-powered inverters

Due to issues with some smart-buffers that will randomly reboot when the conencted inverter is not consuming any power we need to allow users to set smart-buffer-powered inverters to stay active at the lower limit instead of going into standby.

Author: AndreasBoehm

include/Configuration.h

@@ -148,6 +148,7 @@ struct POWERLIMITER_INVERTER_CONFIG_T {
     bool IsGoverned;
     bool IsBehindPowerMeter;
     bool UseOverscaling;
+    bool AllowStandby;
     uint16_t LowerPowerLimit;
     uint16_t UpperPowerLimit;
 

include/defaults.h

@@ -131,6 +131,7 @@
 #define POWERLIMITER_BATTERY_ALWAYS_USE_AT_NIGHT false
 #define POWERLIMITER_IS_INVERTER_BEHIND_POWER_METER true
 #define POWERLIMITER_USE_OVERSCALING false
+#define POWERLIMITER_ALLOW_STANDBY true
 #define POWERLIMITER_INVERTER_CHANNEL_ID 0
 #define POWERLIMITER_TARGET_POWER_CONSUMPTION 0
 #define POWERLIMITER_TARGET_POWER_CONSUMPTION_HYSTERESIS 0
@@ -190,4 +191,4 @@
 #define GRIDCHARGER_HUAWEI_OFFLINE_CURRENT 0.0
 #define GRIDCHARGER_HUAWEI_INPUT_CURRENT_LIMIT 0.0
 #define GRIDCHARGER_HUAWEI_FAN_ONLINE_FULL_SPEED false
-#define GRIDCHARGER_HUAWEI_FAN_OFFLINE_FULL_SPEED false
+#define GRIDCHARGER_HUAWEI_FAN_OFFLINE_FULL_SPEED false

src/Configuration.cpp

@@ -222,6 +222,7 @@ void ConfigurationClass::serializePowerLimiterConfig(PowerLimiterConfig const& s
         t["is_behind_power_meter"] = s.IsBehindPowerMeter;
         t["power_source"] = s.PowerSource;
         t["use_overscaling_to_compensate_shading"] = s.UseOverscaling;
+        t["allow_standby"] = s.AllowStandby;
         t["lower_power_limit"] = s.LowerPowerLimit;
         t["upper_power_limit"] = s.UpperPowerLimit;
     }
@@ -639,6 +640,7 @@ void ConfigurationClass::deserializePowerLimiterConfig(JsonObject const& source,
         inv.IsBehindPowerMeter = s["is_behind_power_meter"] | POWERLIMITER_IS_INVERTER_BEHIND_POWER_METER;
         inv.PowerSource = s["power_source"] | PowerLimiterInverterConfig::InverterPowerSource::Battery;
         inv.UseOverscaling = s["use_overscaling_to_compensate_shading"] | POWERLIMITER_USE_OVERSCALING;
+        inv.AllowStandby = s["allow_standby"] | POWERLIMITER_ALLOW_STANDBY;
         inv.LowerPowerLimit = s["lower_power_limit"] | POWERLIMITER_LOWER_POWER_LIMIT;
         inv.UpperPowerLimit = s["upper_power_limit"] | POWERLIMITER_UPPER_POWER_LIMIT;
     }

src/PowerLimiterSmartBufferInverter.cpp

@@ -9,7 +9,7 @@ uint16_t PowerLimiterSmartBufferInverter::getMaxReductionWatts(bool allowStandby
 
     if (!isProducing()) { return 0; }
 
-    if (allowStandby) { return getCurrentOutputAcWatts(); }
+    if (allowStandby && _config.AllowStandby) { return getCurrentOutputAcWatts(); }
 
     if (getCurrentOutputAcWatts() <= _config.LowerPowerLimit) { return 0; }
 
@@ -61,7 +61,7 @@ uint16_t PowerLimiterSmartBufferInverter::applyReduction(uint16_t reduction, boo
 
     auto low = std::min(getCurrentLimitWatts(), getCurrentOutputAcWatts());
     if (low <= _config.LowerPowerLimit) {
-        if (allowStandby) {
+        if (allowStandby && _config.AllowStandby) {
             standby();
             return std::min(reduction, getCurrentOutputAcWatts());
         }
@@ -81,7 +81,7 @@ uint16_t PowerLimiterSmartBufferInverter::applyReduction(uint16_t reduction, boo
         return reduction;
     }
 
-    if (allowStandby) {
+    if (allowStandby && _config.AllowStandby) {
         standby();
         return std::min(reduction, getCurrentOutputAcWatts());
     }

webapp/src/locales/de.json

@@ -725,6 +725,8 @@
         "TotalUpperPowerLimitHint": "Die Wechselrichter werden so eingestellt, dass sie in Summe höchstens diese Leistung erbringen.",
         "UpperPowerLimit": "Maximales Leistungslimit",
         "UpperPowerLimitHint": "Der Wechselrichter wird stets so eingestellt, dass höchstens diese Ausgangsleistung erreicht wird. Dieser Wert muss so gewählt werden, dass die Strombelastbarkeit der AC-Anschlussleitungen eingehalten wird.",
+        "AllowStandby": "Standby erlauben",
+        "AllowStandbyHint": "Erlaubt dem Wechselrichter in Standby zu gehen, wenn das berechnete Leistungslimit unter dem minimalen Leistungslimit liegt.",
         "SocThresholds": "Batterie State of Charge (SoC) Schwellwerte",
         "IgnoreSoc": "Nur Spannungs-Schwellwerte nutzen",
         "IgnoreSocHint": "Falls aktiviert werden nur die Spannungs-Schwellwerte berücksichtigt. Deaktiviere diesen Schalter, um Batterie State of Charge (SoC) Schwellwerte zu konfigurieren (nicht empfohlen, da der SoC-Wert häufig ungenau ist).",

webapp/src/locales/en.json

@@ -725,6 +725,8 @@
         "TotalUpperPowerLimitHint": "The inverters are configured to output this maximum amount of power in total.",
         "UpperPowerLimit": "Maximum Power Limit",
         "UpperPowerLimitHint": "The inverter is always set such that no more than this output power is achieved. This value must be selected to comply with the current carrying capacity of the AC connection cables.",
+        "AllowStandby": "Allow Standby",
+        "AllowStandbyHint": "Allow the inverter to go into standby if the calculated power limit is below the minimum power limit.",
         "SocThresholds": "Battery State of Charge (SoC) Thresholds",
         "IgnoreSoc": "Use Voltage Thresholds Only",
         "IgnoreSocHint": "When enabled, only voltage thresholds are considered. Disable this switch to configure and use battery State of Charge (SoC) thresholds (not recommended as the SoC value is often inaccurate).",

webapp/src/types/PowerLimiterConfig.ts

@@ -28,6 +28,7 @@ export interface PowerLimiterInverterConfig {
     is_behind_power_meter: boolean;
     power_source: number;
     use_overscaling_to_compensate_shading: boolean;
+    allow_standby: boolean;
     lower_power_limit: number;
     upper_power_limit: number;
 }

webapp/src/views/PowerLimiterAdminView.vue

@@ -161,6 +161,15 @@
                             </div>
                         </div>
 
+                        <InputElement
+                            :label="$t('powerlimiteradmin.AllowStandby')"
+                            :tooltip="$t('powerlimiteradmin.AllowStandbyHint')"
+                            v-if="powerLimiterConfigList.inverters[idx].power_source == 2"
+                            v-model="powerLimiterConfigList.inverters[idx].allow_standby"
+                            type="checkbox"
+                            wide
+                        />
+
                         <InputElement
                             v-if="
                                 powerLimiterConfigList.inverters[idx].power_source != 0 &&
@@ -726,6 +735,7 @@ export default defineComponent({
                 newInv.upper_power_limit = Math.max(metaInv.max_power, 300);
                 newInv.power_source = 0; // battery
                 newInv.use_overscaling_to_compensate_shading = false;
+                newInv.allow_standby = true;
                 inverters.push(newInv);
             }