diff --git a/lib/Hoymiles/src/Hoymiles.cpp b/lib/Hoymiles/src/Hoymiles.cpp
new file mode 100644
index 00000000..e372222e
--- /dev/null
+++ b/lib/Hoymiles/src/Hoymiles.cpp
@@ -0,0 +1,79 @@
+#include "Hoymiles.h"
+#include "inverters/HM_4CH.h"
+#include <Arduino.h>
+#include <Every.h>
+
+HoymilesClass Hoymiles;
+
+void HoymilesClass::init()
+{
+    _pollInterval = 0;
+    _radio.reset(new HoymilesRadio());
+    _radio->init();
+}
+
+void HoymilesClass::loop()
+{
+    _radio->loop();
+}
+
+std::shared_ptr<InverterAbstract> HoymilesClass::addInverter(const char* name, uint64_t serial)
+{
+    std::shared_ptr<InverterAbstract> i;
+    if (HM_4CH::isValidSerial(serial)) {
+        i = std::make_shared<HM_4CH>();
+    }
+
+    if (i) {
+        i->setSerial(serial);
+        i->setName(name);
+        _inverters.push_back(std::move(i));
+        return _inverters.back();
+    }
+
+    return nullptr;
+}
+
+std::shared_ptr<InverterAbstract> HoymilesClass::getInverterByPos(uint8_t pos)
+{
+    if (pos > _inverters.size()) {
+        return nullptr;
+    } else {
+        return _inverters[pos];
+    }
+}
+
+std::shared_ptr<InverterAbstract> HoymilesClass::getInverterBySerial(uint64_t serial)
+{
+    for (uint8_t i = 0; i < _inverters.size(); i++) {
+        if (_inverters[i]->serial() == serial) {
+            return _inverters[i];
+        }
+    }
+    return nullptr;
+}
+
+void HoymilesClass::removeInverterByPos(uint8_t pos)
+{
+    _inverters.erase(_inverters.begin() + pos);
+}
+
+size_t HoymilesClass::getNumInverters()
+{
+    return _inverters.size();
+}
+
+HoymilesRadio* HoymilesClass::getRadio()
+{
+    return _radio.get();
+}
+
+uint32_t HoymilesClass::PollInterval()
+{
+    return _pollInterval;
+}
+
+void HoymilesClass::setPollInterval(uint32_t interval)
+{
+    _pollInterval = interval;
+}
\ No newline at end of file
diff --git a/lib/Hoymiles/src/Hoymiles.h b/lib/Hoymiles/src/Hoymiles.h
new file mode 100644
index 00000000..cba4ddd2
--- /dev/null
+++ b/lib/Hoymiles/src/Hoymiles.h
@@ -0,0 +1,34 @@
+#pragma once
+
+#include "HoymilesRadio.h"
+#include "inverters/InverterAbstract.h"
+#include "types.h"
+#include <SPI.h>
+#include <memory>
+#include <vector>
+
+class HoymilesClass {
+public:
+    void init();
+    void loop();
+
+    std::shared_ptr<InverterAbstract> addInverter(const char* name, uint64_t serial);
+    std::shared_ptr<InverterAbstract> getInverterByPos(uint8_t pos);
+    std::shared_ptr<InverterAbstract> getInverterBySerial(uint64_t serial);
+    std::shared_ptr<InverterAbstract> getInverterByTelegram(uint8_t buf[]);
+    void removeInverterByPos(uint8_t pos);
+    size_t getNumInverters();
+
+    HoymilesRadio* getRadio();
+
+    uint32_t PollInterval();
+    void setPollInterval(uint32_t interval);
+
+private:
+    std::vector<std::shared_ptr<InverterAbstract>> _inverters;
+    std::unique_ptr<HoymilesRadio> _radio;
+
+    uint32_t _pollInterval;
+};
+
+extern HoymilesClass Hoymiles;
\ No newline at end of file
diff --git a/lib/Hoymiles/src/HoymilesRadio.cpp b/lib/Hoymiles/src/HoymilesRadio.cpp
new file mode 100644
index 00000000..e1357753
--- /dev/null
+++ b/lib/Hoymiles/src/HoymilesRadio.cpp
@@ -0,0 +1,119 @@
+#include "HoymilesRadio.h"
+#include <Every.h>
+#include <FunctionalInterrupt.h>
+
+void HoymilesRadio::init()
+{
+    _dtuSerial.u64 = 0;
+
+    _radio.reset(new RF24(4, 5));
+    _radio->begin();
+    _radio->setDataRate(RF24_250KBPS);
+    _radio->enableDynamicPayloads();
+    _radio->setCRCLength(RF24_CRC_16);
+    _radio->setAddressWidth(5);
+    _radio->setAutoAck(false);
+    _radio->setRetries(0, 0);
+    _radio->setPALevel(RF_PWR_LOW);
+    _radio->maskIRQ(true, true, false); // enable only receiving interrupts
+    if (_radio->isChipConnected()) {
+        Serial.println(F("Connection successfull"));
+    } else {
+        Serial.println(F("Connection error!!"));
+    }
+
+    setDtuSerial(_dtuSerial.u64);
+
+    attachInterrupt(digitalPinToInterrupt(16), std::bind(&HoymilesRadio::handleIntr, this), FALLING);
+    _radio->startListening();
+}
+
+void HoymilesRadio::loop()
+{
+    EVERY_N_MILLIS(4)
+    {
+        switchRxCh(1);
+    }
+
+    // Irgendwie muss man hier die paket crc prüfen und ggf. einen retransmit anfordern
+    // ggf aber immer nur ein paket analysieren damit die loop schnell bleibt
+
+    if (_packetReceived) {
+        Serial.println(F("Interrupt received"));
+        while (_radio->available()) {
+            if (!_rxBuffer.full()) {
+                packet_t* p;
+                uint8_t len;
+                p = _rxBuffer.getFront();
+                memset(p->packet, 0xcc, MAX_RF_PAYLOAD_SIZE);
+                p->rxCh = _rxChLst[_rxChIdx];
+                len = _radio->getPayloadSize();
+                if (len > MAX_RF_PAYLOAD_SIZE)
+                    len = MAX_RF_PAYLOAD_SIZE;
+
+                _radio->read(p->packet, len);
+                _rxBuffer.pushFront(p);
+            } else {
+                Serial.println(F("Buffer full"));
+                _radio->flush_rx();
+            }
+        }
+
+        _packetReceived = false;
+    }
+}
+
+void HoymilesRadio::setPALevel(rf24_pa_dbm_e paLevel)
+{
+    _radio->setPALevel(paLevel);
+}
+
+serial_u HoymilesRadio::DtuSerial()
+{
+    return _dtuSerial;
+}
+
+void HoymilesRadio::setDtuSerial(uint64_t serial)
+{
+    serial_u s;
+    _dtuSerial.u64 = serial;
+    s = convertSerialToRadioId(_dtuSerial);
+    _radio->openReadingPipe(1, s.u64);
+}
+
+void ARDUINO_ISR_ATTR HoymilesRadio::handleIntr()
+{
+    _packetReceived = true;
+}
+
+uint8_t HoymilesRadio::getRxNxtChannel()
+{
+    if (++_rxChIdx >= 4)
+        _rxChIdx = 0;
+    return _rxChLst[_rxChIdx];
+}
+
+bool HoymilesRadio::switchRxCh(uint8_t addLoop)
+{
+    _rxLoopCnt += addLoop;
+    if (_rxLoopCnt != 0) {
+        _rxLoopCnt--;
+        // portDISABLE_INTERRUPTS();
+        _radio->stopListening();
+        _radio->setChannel(getRxNxtChannel());
+        _radio->startListening();
+        // portENABLE_INTERRUPTS();
+    }
+    return (0 == _rxLoopCnt); // receive finished
+}
+
+serial_u HoymilesRadio::convertSerialToRadioId(serial_u serial)
+{
+    serial_u radioId;
+    radioId.b[4] = serial.b[0];
+    radioId.b[3] = serial.b[1];
+    radioId.b[2] = serial.b[2];
+    radioId.b[1] = serial.b[3];
+    radioId.b[0] = 0x01;
+    return radioId;
+}
\ No newline at end of file
diff --git a/lib/Hoymiles/src/HoymilesRadio.h b/lib/Hoymiles/src/HoymilesRadio.h
new file mode 100644
index 00000000..9c646945
--- /dev/null
+++ b/lib/Hoymiles/src/HoymilesRadio.h
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "CircularBuffer.h"
+#include "types.h"
+#include <RF24.h>
+#include <memory>
+#include <nRF24L01.h>
+
+// maximum buffer length of packet received / sent to RF24 module
+#define MAX_RF_PAYLOAD_SIZE 32
+
+// number of packets hold in buffer
+#define PACKET_BUFFER_SIZE 30
+
+typedef struct {
+    uint8_t rxCh;
+    uint8_t packet[MAX_RF_PAYLOAD_SIZE];
+} packet_t;
+
+class HoymilesRadio {
+public:
+    void init();
+    void loop();
+    void setPALevel(rf24_pa_dbm_e paLevel);
+
+    serial_u DtuSerial();
+    void setDtuSerial(uint64_t serial);
+
+private:
+    void ARDUINO_ISR_ATTR handleIntr();
+    static serial_u convertSerialToRadioId(serial_u serial);
+    uint8_t getRxNxtChannel();
+    bool switchRxCh(uint8_t addLoop = 0);
+
+    std::unique_ptr<RF24> _radio;
+    uint8_t _rxChLst[4] = { 3, 23, 61, 75 };
+    uint8_t _rxChIdx;
+    uint16_t _rxLoopCnt;
+
+    volatile bool _packetReceived;
+
+    CircularBuffer<packet_t, PACKET_BUFFER_SIZE> _rxBuffer;
+
+    serial_u _dtuSerial;
+};
\ No newline at end of file
diff --git a/lib/Hoymiles/src/inverters/HM_4CH.cpp b/lib/Hoymiles/src/inverters/HM_4CH.cpp
new file mode 100644
index 00000000..4dd395d8
--- /dev/null
+++ b/lib/Hoymiles/src/inverters/HM_4CH.cpp
@@ -0,0 +1,16 @@
+#include "HM_4CH.h"
+
+bool HM_4CH::isValidSerial(uint64_t serial)
+{
+    return serial >= 116100000000 && serial <= 116199999999;
+}
+
+String HM_4CH::typeName()
+{
+    return String(F("HM-1500"));
+}
+
+const byteAssign_t* HM_4CH::getByteAssignment()
+{
+    return byteAssignment;
+}
\ No newline at end of file
diff --git a/lib/Hoymiles/src/inverters/HM_4CH.h b/lib/Hoymiles/src/inverters/HM_4CH.h
new file mode 100644
index 00000000..89de7116
--- /dev/null
+++ b/lib/Hoymiles/src/inverters/HM_4CH.h
@@ -0,0 +1,52 @@
+#pragma once
+
+#include "InverterAbstract.h"
+
+class HM_4CH : public InverterAbstract {
+public:
+    static bool isValidSerial(uint64_t serial);
+    String typeName();
+    const byteAssign_t* getByteAssignment();
+
+private:
+    const byteAssign_t byteAssignment[34] = {
+        { FLD_UDC, UNIT_V, CH1, 2, 2, 10 },
+        { FLD_IDC, UNIT_A, CH1, 4, 2, 100 },
+        { FLD_PDC, UNIT_W, CH1, 8, 2, 10 },
+        { FLD_YD, UNIT_WH, CH1, 20, 2, 1 },
+        { FLD_YT, UNIT_KWH, CH1, 12, 4, 1000 },
+        { FLD_IRR, UNIT_PCT, CH1, CALC_IRR_CH, CH1, CMD_CALC },
+
+        { FLD_UDC, UNIT_V, CH2, CALC_UDC_CH, CH1, CMD_CALC },
+        { FLD_IDC, UNIT_A, CH2, 6, 2, 100 },
+        { FLD_PDC, UNIT_W, CH2, 10, 2, 10 },
+        { FLD_YD, UNIT_WH, CH2, 22, 2, 1 },
+        { FLD_YT, UNIT_KWH, CH2, 16, 4, 1000 },
+        { FLD_IRR, UNIT_PCT, CH2, CALC_IRR_CH, CH2, CMD_CALC },
+
+        { FLD_UDC, UNIT_V, CH3, 24, 2, 10 },
+        { FLD_IDC, UNIT_A, CH3, 26, 2, 100 },
+        { FLD_PDC, UNIT_W, CH3, 30, 2, 10 },
+        { FLD_YD, UNIT_WH, CH3, 42, 2, 1 },
+        { FLD_YT, UNIT_KWH, CH3, 34, 4, 1000 },
+        { FLD_IRR, UNIT_PCT, CH3, CALC_IRR_CH, CH3, CMD_CALC },
+
+        { FLD_UDC, UNIT_V, CH4, CALC_UDC_CH, CH3, CMD_CALC },
+        { FLD_IDC, UNIT_A, CH4, 28, 2, 100 },
+        { FLD_PDC, UNIT_W, CH4, 32, 2, 10 },
+        { FLD_YD, UNIT_WH, CH4, 44, 2, 1 },
+        { FLD_YT, UNIT_KWH, CH4, 38, 4, 1000 },
+        { FLD_IRR, UNIT_PCT, CH4, CALC_IRR_CH, CH4, CMD_CALC },
+
+        { FLD_UAC, UNIT_V, CH0, 46, 2, 10 },
+        { FLD_IAC, UNIT_A, CH0, 54, 2, 100 },
+        { FLD_PAC, UNIT_W, CH0, 50, 2, 10 },
+        { FLD_F, UNIT_HZ, CH0, 48, 2, 100 },
+        { FLD_PCT, UNIT_PCT, CH0, 56, 2, 10 },
+        { FLD_T, UNIT_C, CH0, 58, 2, 10 },
+        { FLD_YD, UNIT_WH, CH0, CALC_YD_CH0, 0, CMD_CALC },
+        { FLD_YT, UNIT_KWH, CH0, CALC_YT_CH0, 0, CMD_CALC },
+        { FLD_PDC, UNIT_W, CH0, CALC_PDC_CH0, 0, CMD_CALC },
+        { FLD_EFF, UNIT_PCT, CH0, CALC_EFF_CH0, 0, CMD_CALC }
+    };
+};
\ No newline at end of file
diff --git a/lib/Hoymiles/src/inverters/InverterAbstract.cpp b/lib/Hoymiles/src/inverters/InverterAbstract.cpp
new file mode 100644
index 00000000..1278afc1
--- /dev/null
+++ b/lib/Hoymiles/src/inverters/InverterAbstract.cpp
@@ -0,0 +1,23 @@
+#include "InverterAbstract.h"
+#include <cstring>
+
+void InverterAbstract::setSerial(uint64_t serial)
+{
+    _serial.u64 = serial;
+}
+
+uint64_t InverterAbstract::serial()
+{
+    return _serial.u64;
+}
+
+void InverterAbstract::setName(const char* name)
+{
+    uint8_t len = strlen(name);
+    strncpy(_name, name, (len > MAX_NAME_LENGTH) ? MAX_NAME_LENGTH : len);
+}
+
+const char* InverterAbstract::name()
+{
+    return _name;
+}
diff --git a/lib/Hoymiles/src/inverters/InverterAbstract.h b/lib/Hoymiles/src/inverters/InverterAbstract.h
new file mode 100644
index 00000000..e57f3d66
--- /dev/null
+++ b/lib/Hoymiles/src/inverters/InverterAbstract.h
@@ -0,0 +1,75 @@
+#pragma once
+
+#include "types.h"
+#include <Arduino.h>
+#include <cstdint>
+
+#define MAX_NAME_LENGTH 16
+
+// units
+enum { UNIT_V = 0,
+    UNIT_A,
+    UNIT_W,
+    UNIT_WH,
+    UNIT_KWH,
+    UNIT_HZ,
+    UNIT_C,
+    UNIT_PCT };
+const char* const units[] = { "V", "A", "W", "Wh", "kWh", "Hz", "°C", "%" };
+
+// field types
+enum { FLD_UDC = 0,
+    FLD_IDC,
+    FLD_PDC,
+    FLD_YD,
+    FLD_YW,
+    FLD_YT,
+    FLD_UAC,
+    FLD_IAC,
+    FLD_PAC,
+    FLD_F,
+    FLD_T,
+    FLD_PCT,
+    FLD_EFF,
+    FLD_IRR };
+const char* const fields[] = { "U_DC", "I_DC", "P_DC", "YieldDay", "YieldWeek", "YieldTotal",
+    "U_AC", "I_AC", "P_AC", "Freq", "Temp", "Pct", "Effiency", "Irradiation" };
+
+// indices to calculation functions, defined in hmInverter.h
+enum { CALC_YT_CH0 = 0,
+    CALC_YD_CH0,
+    CALC_UDC_CH,
+    CALC_PDC_CH0,
+    CALC_EFF_CH0,
+    CALC_IRR_CH };
+enum { CMD_CALC = 0xffff };
+
+// CH0 is default channel (freq, ac, temp)
+enum { CH0 = 0,
+    CH1,
+    CH2,
+    CH3,
+    CH4 };
+
+typedef struct {
+    uint8_t fieldId; // field id
+    uint8_t unitId; // uint id
+    uint8_t ch; // channel 0 - 4
+    uint8_t start; // pos of first byte in buffer
+    uint8_t num; // number of bytes in buffer
+    uint16_t div; // divisor / calc command
+} byteAssign_t;
+
+class InverterAbstract {
+public:
+    void setSerial(uint64_t serial);
+    uint64_t serial();
+    void setName(const char* name);
+    const char* name();
+    virtual String typeName() = 0;
+    virtual const byteAssign_t* getByteAssignment() = 0;
+
+private:
+    serial_u _serial;
+    char _name[MAX_NAME_LENGTH];
+};
\ No newline at end of file
diff --git a/lib/Hoymiles/src/types.h b/lib/Hoymiles/src/types.h
new file mode 100644
index 00000000..ee36a8c1
--- /dev/null
+++ b/lib/Hoymiles/src/types.h
@@ -0,0 +1,8 @@
+#pragma once
+
+#include <cstdint>
+
+union serial_u {
+    uint64_t u64;
+    uint8_t b[8];
+};
\ No newline at end of file
diff --git a/platformio.ini b/platformio.ini
index d0442c8b..db2d053e 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -26,6 +26,7 @@ lib_deps =
     https://github.com/me-no-dev/ESPAsyncWebServer.git
     bblanchon/ArduinoJson @ ^6.19.4
     https://github.com/marvinroger/async-mqtt-client.git
+    nrf24/RF24 @ ^1.4.2
 
 board = esp32dev
 board_build.partitions = partitions_custom.csv