diff --git a/lib/Hoymiles/src/HoymilesRadio_CMT.cpp b/lib/Hoymiles/src/HoymilesRadio_CMT.cpp
index 6c889205..4fd88357 100644
--- a/lib/Hoymiles/src/HoymilesRadio_CMT.cpp
+++ b/lib/Hoymiles/src/HoymilesRadio_CMT.cpp
@@ -199,7 +199,7 @@ enumCMTresult HoymilesRadio_CMT::cmtProcess(void)
             cmtRxTimeoutCnt++;
         } else {
             uint32_t invSerial = cmtTxBuffer[1] << 24 | cmtTxBuffer[2] << 16 | cmtTxBuffer[3] << 8 | cmtTxBuffer[4]; // read inverter serial from last Tx buffer
-            cmtSwitchInvAndDtuFreq(invSerial, HOY_BOOT_FREQ / 1000, HOYMILES_CMT_WORK_FREQ);
+            cmtSwitchInvAndDtuFreq(invSerial, HOY_BOOT_FREQ / 1000, _inverterTargetFrequency);
         }
 
         nRes = CMT_RX_TIMEOUT;
@@ -306,7 +306,7 @@ void HoymilesRadio_CMT::init(int8_t pin_sdio, int8_t pin_clk, int8_t pin_cs, int
 
     _radio->begin();
 
-    cmtSwitchDtuFreq(HOYMILES_CMT_WORK_FREQ); // start dtu at work freqency, for fast Rx if inverter is already on and frequency switched
+    cmtSwitchDtuFreq(_inverterTargetFrequency); // start dtu at work freqency, for fast Rx if inverter is already on and frequency switched
 
     if (_radio->isChipConnected()) {
         Hoymiles.getMessageOutput()->println("Connection successful");
@@ -436,6 +436,15 @@ void HoymilesRadio_CMT::setPALevel(int8_t paLevel)
     }
 }
 
+void HoymilesRadio_CMT::setInverterTargetFrequency(uint32_t frequency)
+{
+    _inverterTargetFrequency = frequency;
+    if (!_isInitialized) {
+        return;
+    }
+    cmtSwitchDtuFreq(_inverterTargetFrequency);
+}
+
 bool HoymilesRadio_CMT::isConnected()
 {
     if (!_isInitialized) {
diff --git a/lib/Hoymiles/src/HoymilesRadio_CMT.h b/lib/Hoymiles/src/HoymilesRadio_CMT.h
index 9c2ddb3f..f4218c14 100644
--- a/lib/Hoymiles/src/HoymilesRadio_CMT.h
+++ b/lib/Hoymiles/src/HoymilesRadio_CMT.h
@@ -13,6 +13,10 @@
 // number of fragments hold in buffer
 #define FRAGMENT_BUFFER_SIZE 30
 
+#ifndef HOYMILES_CMT_WORK_FREQ
+#define HOYMILES_CMT_WORK_FREQ 865000
+#endif
+
 /* CMT states */
 typedef enum {
     CMT_STATE_IDLE = 0,
@@ -43,6 +47,7 @@ public:
     void init(int8_t pin_sdio, int8_t pin_clk, int8_t pin_cs, int8_t pin_fcs, int8_t pin_gpio2, int8_t pin_gpio3);
     void loop();
     void setPALevel(int8_t paLevel);
+    void setInverterTargetFrequency(uint32_t frequency);
 
     bool isConnected();
 
@@ -64,6 +69,8 @@ private:
     TimeoutHelper _rxTimeout;
     TimeoutHelper _txTimeout;
 
+    uint32_t _inverterTargetFrequency = HOYMILES_CMT_WORK_FREQ;
+
     String cmtChToFreq(const uint8_t channel);
     void cmtSwitchChannel(const uint8_t channel);
     uint8_t cmtFreqToChan(const String& func_name, const String& var_name, const uint32_t freq_kHz);
diff --git a/platformio.ini b/platformio.ini
index 87fe8151..ecf1632d 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -56,7 +56,6 @@ build_flags = ${env.build_flags}
     -DHOYMILES_PIN_IRQ=16
     -DHOYMILES_PIN_CE=4
     -DHOYMILES_PIN_CS=5
-    -DHOYMILES_CMT_WORK_FREQ=865000
 
 
 [env:olimex_esp32_poe]