ESP32 DEVKITV1 30PIN + MAX485 + MPPT Xtra + MQTT

[romew137]

Hello,
Sorry for asking, but this is my first time to working with Arduino IDE.
I need your help. I installed the ESP32 Board with Arduino IDE with this in the config.h:

/**
 * Solar Tracer Blynk V3 [https://github.com/Bettapro/Solar-Tracer-Blynk-V3]
 * Copyright (c) 2021 Alberto Bettin 
 *
 * Based on the work of @jaminNZx and @tekk.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 */

/**
 *  
 * Use this file to set parameters and settings for your 
 * setup.
 *
 */

#pragma once

/**
 * DEBUG MESSAGES
 * 
 * Support for debug messages via serial
 */
// specify which Serial to use for debug messages
//#define BOARD_DEBUG_SERIAL_STREAM Serial
// set accordingly: monitor_speed in platformio.ini
//#define BOARD_DEBUG_SERIAL_STREAM_BAUDRATE 115200
// debug will print a warning line for each un-synced variable
//#define USE_DEBUG_SERIAL_VERBOSE_SYNC_ERROR_VARIABLE 

/**
 * STATUS
 * 
 * Define how/if the board should notify an error
 */
// blink a led when errors occur
//#define USE_STATUS_LED
#ifdef USE_STATUS_LED
  //specify pin number connected to the status led
  #define STATUS_LED_PIN 2
#endif

/**
 * SOLAR CHARGE CONTROLLER 
 * 
 * Define the communication parameters for the
 * solar tracer
 */
// solar tracer model
#define SOLAR_TRACER_MODEL EPEVER_SOLAR_TRACER_XTRA
// use serial as communication interfce
#define USE_SERIAL_STREAM
#ifdef USE_SERIAL_STREAM
  // use a software serial (instead of the emulated one)
  //#define USE_SOFTWARE_SERIAL
  // specify the serial port to use 
  #define BOARD_ST_SERIAL_STREAM Serial2
  // specify the baudrate to use (leave commented to use the correct based on you solar tracer)
  //#define BOARD_ST_SERIAL_STREAM_BAUDRATE 115200 

  // ms to wait for a response from controller, then a timeout error will be triggered
  //#define SERIAL_COMMUNICATION_TIMEOUT 2000

  // specify your rx pin
  //#define BOARD_ST_SERIAL_PIN_MAPPING_RX 16
  // specify your tx pin
  //#define BOARD_ST_SERIAL_PIN_MAPPING_TX 17

  // ms to wait before sending any request
  //#define BOARD_ST_SERIAL_PRETRANSMIT_WAIT 0
  
  #define USE_SERIAL_MAX485
  #ifdef USE_SERIAL_MAX485
    // specify the pin num. connected to DE
    #define MAX485_DE 13
    // specify the pin num. connected to RE_NEG
    #define MAX485_RE_NEG 13
  #endif
#endif

#define SOLAR_TRACER_COMMUNICATION_PROTOCOL COMMUNICATION_PROTOCOL_MODBUS_RTU
#if SOLAR_TRACER_COMMUNICATION_PROTOCOL == COMMUNICATION_PROTOCOL_MODBUS_RTU
  //#define MODBUS_SLAVE_ID 1
#endif

//#define USE_EXTERNAL_HEAVY_LOAD_CURRENT_METER
#ifdef USE_EXTERNAL_HEAVY_LOAD_CURRENT_METER
  // voltage reading are taken using ESP adcs
  //#define USE_EXTERNAL_HEAVY_LOAD_CURRENT_ADC
  #ifdef USE_EXTERNAL_HEAVY_LOAD_CURRENT_ADC
    #define ADC_LOAD_CURRENT_PIN 36
  #endif

  // voltage reading by I2c ADS1015 
  #define USE_EXTERNAL_HEAVY_LOAD_CURRENT_METER_ADS1015_ADC
  #ifdef USE_EXTERNAL_HEAVY_LOAD_CURRENT_METER_ADS1015_ADC
    #define ADS1015_LOAD_CURRENT_CHANNEL 0
  #endif

  // number of samples to get each run
  #define EXTERNAL_HEAVY_LOAD_CURRENT_METER_SAMPLES_NUMBER 4
  // milliseconds between 2 reading
  #define EXTERNAL_HEAVY_LOAD_CURRENT_METER_SAMPLE_INTERVAL 150
  // V measured at 0 ampere flowing to the load
  #define EXTERNAL_HEAVY_LOAD_CURRENT_METER_VOLTAGE_ZERO_AMP_VOLT 0.009
  // Volt/Ampere ratio
  #define EXTERNAL_HEAVY_LOAD_CURRENT_METER_VOLTAGE_AMP_VOLT 4/100.0
#endif

// How many ms between each refresh request 
//#define CONTROLLER_UPDATE_MS_PERIOD 2000L

 /*
  * TIME SYNC
  */
// uncomment if the ESP should get the time from a NTP server at boot 
#define USE_NTP_SERVER 
#ifdef USE_NTP_SERVER
  // uncomment if the controller has to sync its time with the tracer at boot
  #define SYNC_ST_TIME
  // specify the preferred NTP server
  #define NTP_SERVER_CONNECT_TO "europe.pool.ntp.org"
  // specify your timezone (refer to: https://sites.google.com/a/usapiens.com/opnode/time-zones )
  #define CURRENT_TIMEZONE  "CET-1CEST-2,M3.5.0/02:00:00,M10.5.0/03:00:00"
#endif


/*
 * WIFI

 * Fill with you wifi auth. data
 */
// your wifi SSID
#define WIFI_SSID             "MY Network"
// your wifi PASSWORD
#define WIFI_PASS             "My Password"
// your wifi IP ADDRESS
#define WIFI_IP_ADDRESS       "192.168.10.123"
// your wifi GATEWAY
#define WIFI_GATEWAY          "192.168.10.1"
// your wifi SUBNET
#define WIFI_SUBNET           "255.255.255.0"
// your wifi DNS1
#define WIFI_DNS1             "192.168.10.1"
// your wifi DNS2
#define WIFI_DNS2             ""


/*
 * OTA UPDATE
 */
// uncomment to enable OTA updates
#define USE_OTA_UPDATE
#ifdef USE_OTA_UPDATE
	//Over The Air Hostname, set accordingly: upload_port in platformio.ini
	#define OTA_HOSTNAME "SOLAR-MODBUS"
  // OTA password, set accordingly: upload_flags --auth in platformio.ini
	#define OTA_PASS "admin"
#endif

/**
 *  SETTING SETUP OVER WEB PAGE
 * 
 *  The board will enter in this mode if:
 *    - it cannot connect to wifi network
 *    - USE_HALL_AP_CONFIGURATION_TRIGGER is enabled and magnet is near to ESP module
 *    - USE_PIN_AP_CONFIGURATION_TRIGGER is enabled and the pin is HIGH (or LOW)
 */
#define USE_WIFI_AP_CONFIGURATION
#if defined USE_WIFI_AP_CONFIGURATION
  // ap name
  #define WIFI_AP_CONFIGURATION_HOSTNAME "SolarTracerAP"
  // ap password
  #define WIFI_AP_CONFIGURATION_PASSWORD "admin1234"
  // max seconds ap will wait to be configured
  #define WIFI_AP_TIMEOUT 150

  // use hall sensor to trigger ap mode
  //#define USE_HALL_AP_CONFIGURATION_TRIGGER
  #if defined USE_HALL_AP_CONFIGURATION_TRIGGER
    // standard value (no interaction)
    //#define HALL_AP_CONFIGURATION_BASE_VALUE 75
    // threshoold to detect interraction
    //#define HALL_AP_CONFIGURATION_THR_VALUE 30
  #endif

  // use a double reset to trigger ap mode
  #define USE_DOUBLE_RESET_TRIGGER

  // use pin state to trigger ap mode
  //#define USE_PIN_AP_CONFIGURATION_TRIGGER
  #if defined USE_PIN_AP_CONFIGURATION_TRIGGER
    // pin number to use
    //#define PIN_AP_TRIGGER_PIN 19
    // value to consider the pin "triggered"
    #define PIN_AP_TRIGGER_VALUE HIGH
  #endif

  // use pin to reset settings
  //#define USE_PIN_RESET_CONFIGURATION_TRIGGER
  #if defined USE_PIN_RESET_CONFIGURATION_TRIGGER
    // pin number to use
    #define PIN_RESET_TRIGGER_PIN 18
    // value to consider the pin "triggered"
    #define PIN_RESET_TRIGGER_VALUE HIGH
  #endif
#endif

// How many ms between each realtime sync to blynk server
#define SYNC_REALTIME_MS_PERIOD 2000L
// How many ms between each stat sync to blynk server
#define SYNC_STATS_MS_PERIOD 720000L




/*
 * BLYNK
 * Specify how to connect to blynk server and when to sync the data from the tracer
 */
//#define USE_BLYNK
#ifdef USE_NOT_BLYNK
  #undef USE_BLYNK
#endif
#if defined (USE_BLYNK)

  // uncomment to use blynk 2.0
  //#define USE_BLYNK_2
  #ifdef USE_BLYNK_2
    // your project template id
    #define BLYNK_TEMPLATE_ID "-template-id-"
    // device name
    #define BLYNK_DEVICE_NAME "SolarTracer"
  #endif

  // Blynk API key
  #define BLYNK_AUTH "-blynk-aut-"

  // uncomment to use an user-defined blynk server
  //#define USE_BLYNK_LOCAL_SERVER
  #ifdef USE_BLYNK_LOCAL_SERVER
    //address of blynk server (specify the hostname or the ip address eg: IPAddress(192, 168, 1, 78) )
    #define BLYNK_SERVER                  ""
    // port number of the blynk server (eg: 8080)
    #define BLYNK_PORT                  8080
  #endif

  // ESP will wait indefinitely for blynk connection
  #define BLYNK_CONNECTION_REQUIRED

  // virtual pins definition and mapping

  #define vPIN_PV_POWER                                   1
  #define vPIN_PV_CURRENT                                 2
  #define vPIN_PV_VOLTAGE                                 3
  #define vPIN_LOAD_CURRENT                               4
  #define vPIN_LOAD_POWER                                 5
  #define vPIN_BATT_TEMP                                  6
  #define vPIN_BATT_VOLTAGE                               7
  #define vPIN_BATT_REMAIN                                8
  #define vPIN_CONTROLLER_TEMP                            9
  #define vPIN_BATTERY_CHARGE_CURRENT                     10
  #define vPIN_BATTERY_CHARGE_POWER                       11
  #define vPIN_BATTERY_OVERALL_CURRENT                    12
  #define vPIN_LOAD_ENABLED                               14
  #define vPIN_STAT_ENERGY_GENERATED_TODAY                15
  #define vPIN_STAT_ENERGY_GENERATED_THIS_MONTH           16
  #define vPIN_STAT_ENERGY_GENERATED_THIS_YEAR            17
  #define vPIN_STAT_ENERGY_GENERATED_TOTAL                18
  #define vPIN_MIN_BATTERY_VOLTAGE_TODAY                  19
  #define vPIN_MAX_BATTERY_VOLTAGE_TODAY                  20
  #define vPIN_BATTERY_STATUS_TEXT                        23
  #define vPIN_CHARGING_EQUIPMENT_STATUS_TEXT             24
  #define vPIN_DISCHARGING_EQUIPMENT_STATUS_TEXT          25
  #define vPIN_CHARGE_DEVICE_ENABLED                      26
  #define vPIN_CONTROLLER_HEATSINK_TEMP                   29
  #define vPIN_BATTERY_BOOST_VOLTAGE                      30
  #define vPIN_BATTERY_EQUALIZATION_VOLTAGE               31
  #define vPIN_BATTERY_FLOAT_VOLTAGE                      32
  #define vPIN_BATTERY_FLOAT_MIN_VOLTAGE                  33
  #define vPIN_BATTERY_CHARGING_LIMIT_VOLTAGE             34
  #define vPIN_BATTERY_DISCHARGING_LIMIT_VOLTAGE          35
  #define vPIN_BATTERY_LOW_VOLTAGE_DISCONNECT             36
  #define vPIN_BATTERY_LOW_VOLTAGE_RECONNECT              37
  #define vPIN_BATTERY_OVER_VOLTAGE_DISCONNECT            38
  #define vPIN_BATTERY_OVER_VOLTAGE_RECONNECT             39
  #define vPIN_BATTERY_UNDER_VOLTAGE_RESET                40
  #define vPIN_BATTERY_UNDER_VOLTAGE_SET                  41
  #define vPIN_MIN_PV_VOLTAGE_TODAY                       42
  #define vPIN_MAX_PV_VOLTAGE_TODAY                       43
  #define vPIN_BATTERY_RATED_VOLTAGE                      46
  #define vPIN_BATTERY_TYPE                               47
  #define vPIN_BATTERY_CAPACITY                           48
  #define vPIN_BATTERY_EQUALIZATION_DURATION              49
  #define vPIN_BATTERY_BOOST_DURATION                     50
  #define vPIN_BATTERY_TEMPERATURE_COMPENSATION_COEFF     51
  #define vPIN_BATTERY_MANAGEMENT_MODE                    52
  #define vPIN_STAT_ENERGY_CONSUMED_TOTAL                 53
  // internal
  #define vPIN_INTERNAL_STATUS                            27
  #define vPIN_INTERNAL_DEBUG_TERMINAL                    44
  //action
  #define vPIN_UPDATE_ALL_CONTROLLER_DATA                 28
  #define vPIN_UPDATE_CONTROLLER_DATETIME                 45
#endif


/*
 * MQTT
 * Specify how to connect to mqtt broker and when to sync the data from the tracer
 * 
 * NOTE: mqtt support is till a WIP, it supports a small set of the features and variable compared
 *        to blynk. Developed and tested using a thingspeak server and mosquitto broker
 */
#define USE_MQTT
#ifdef USE_NOT_MQTT
  #undef USE_MQTT
#endif
#if defined (USE_MQTT)
  //address of mqtt server (specify the hostname or the ip address eg: IPAddress(192, 168, 1, 78) )
  #define MQTT_SERVER "192.168.10.60"
  // port number of the mqtt server (eg: 1883)
  #define MQTT_PORT 1885
  // username to use 
  #define MQTT_USERNAME "MY Username"
  // password to use in combination with MQTT_USERNAME
  #define MQTT_PASSWORD "MY Password"
  // client id
  #define MQTT_CLIENT_ID "solartracer"

  //#define USE_MQTT_HOME_ASSISTANT
  #ifdef USE_MQTT_HOME_ASSISTANT
    #define MQTT_HOME_ASSISTANT_DEVICE_NAME "SolarTracer1"
  #endif

  // all the "variable topics" will be published in JSON on a single topic defined in MQTT_JSON_PUBLISH_TOPIC
  //#define USE_MQTT_JSON_PUBLISH
  #if defined(USE_MQTT_JSON_PUBLISH) && ! defined(USE_MQTT_HOME_ASSISTANT)
    #define MQTT_JSON_PUBLISH_TOPIC "v1/devices/me/telemetry"
  #endif
  
  // use rpc to send control messages to this board (early stage support)
  //#define USE_MQTT_RPC_SUBSCRIBE
  #if defined(USE_MQTT_RPC_SUBSCRIBE) && ! defined(USE_MQTT_HOME_ASSISTANT)
    #define MQTT_RPC_SUBSCRIBE_TOPIC "v1/devices/me/rpc/request/+"
  #endif

  #if !defined(USE_MQTT_HOME_ASSISTANT)  && ! defined(USE_MQTT_HOME_ASSISTANT)
    #define MQTT_TOPIC_ROOT "solarTracer/values/"
  #else
    // no need to have a topic root
    #define MQTT_TOPIC_ROOT ""
  #endif

  // topics definition and mapping
  #define MQTT_TOPIC_PV_POWER                                 MQTT_TOPIC_ROOT "pv_power"
  #define MQTT_TOPIC_PV_CURRENT                               MQTT_TOPIC_ROOT "pv_current"
  #define MQTT_TOPIC_PV_VOLTAGE                               MQTT_TOPIC_ROOT "pv_voltage"
  #define MQTT_TOPIC_LOAD_CURRENT                             MQTT_TOPIC_ROOT "load_current"
  #define MQTT_TOPIC_LOAD_POWER                               MQTT_TOPIC_ROOT "load_power"
  #define MQTT_TOPIC_BATT_TEMP                                MQTT_TOPIC_ROOT "battery_temperature"
  #define MQTT_TOPIC_BATT_VOLTAGE                             MQTT_TOPIC_ROOT "battery_voltage"
  #define MQTT_TOPIC_BATT_REMAIN                              MQTT_TOPIC_ROOT "battery_soc"
  #define MQTT_TOPIC_CONTROLLER_TEMP                          MQTT_TOPIC_ROOT "controller_temperature"
  #define MQTT_TOPIC_BATTERY_CHARGE_CURRENT                   MQTT_TOPIC_ROOT "battery_charging_current"
  #define MQTT_TOPIC_BATTERY_CHARGE_POWER                     MQTT_TOPIC_ROOT "battery_charging_power"
  #define MQTT_TOPIC_BATTERY_OVERALL_CURRENT                  MQTT_TOPIC_ROOT "battery_overall_current"
  #define MQTT_TOPIC_LOAD_ENABLED                             MQTT_TOPIC_ROOT "controller_load_enabled"
  #define MQTT_TOPIC_STAT_ENERGY_GENERATED_TODAY              MQTT_TOPIC_ROOT "stats_production_day"
  #define MQTT_TOPIC_STAT_ENERGY_GENERATED_THIS_MONTH         MQTT_TOPIC_ROOT "stats_production_month"
  #define MQTT_TOPIC_STAT_ENERGY_GENERATED_THIS_YEAR          MQTT_TOPIC_ROOT "stats_production_year"
  #define MQTT_TOPIC_STAT_ENERGY_GENERATED_TOTAL              MQTT_TOPIC_ROOT "stats_production_total"
  #define MQTT_TOPIC_MIN_BATTERY_VOLTAGE_TODAY                MQTT_TOPIC_ROOT "stats_battery_max_voltage"
  #define MQTT_TOPIC_MAX_BATTERY_VOLTAGE_TODAY                MQTT_TOPIC_ROOT "stats_battery_min_voltage"
  #define MQTT_TOPIC_BATTERY_STATUS_TEXT                      MQTT_TOPIC_ROOT "battery_status_text"
  #define MQTT_TOPIC_CHARGING_EQUIPMENT_STATUS_TEXT           MQTT_TOPIC_ROOT "pv_status_text"
  #define MQTT_TOPIC_DISCHARGING_EQUIPMENT_STATUS_TEXT        MQTT_TOPIC_ROOT "load_status_text"
  #define MQTT_TOPIC_CHARGE_DEVICE_ENABLED                    MQTT_TOPIC_ROOT "controller_charge_enabled"
  #define MQTT_TOPIC_CONTROLLER_HEATSINK_TEMP                 MQTT_TOPIC_ROOT "controller_heatsink_temperature"
  #define MQTT_TOPIC_BATTERY_BOOST_VOLTAGE                    MQTT_TOPIC_ROOT "battery_settings_boost_voltage"
  #define MQTT_TOPIC_BATTERY_EQUALIZATION_VOLTAGE             MQTT_TOPIC_ROOT "battery_settings_equalization_voltage"
  #define MQTT_TOPIC_BATTERY_FLOAT_VOLTAGE                    MQTT_TOPIC_ROOT "battery_settings_float_voltage"
  #define MQTT_TOPIC_BATTERY_FLOAT_MIN_VOLTAGE                MQTT_TOPIC_ROOT "battery_settings_float_min_voltage"
  #define MQTT_TOPIC_BATTERY_CHARGING_LIMIT_VOLTAGE           MQTT_TOPIC_ROOT "battery_settings_charging_limit_voltage"
  #define MQTT_TOPIC_BATTERY_DISCHARGING_LIMIT_VOLTAGE        MQTT_TOPIC_ROOT "battery_settings_discharging_limit_voltage"
  #define MQTT_TOPIC_BATTERY_LOW_VOLTAGE_DISCONNECT           MQTT_TOPIC_ROOT "battery_settings_low_voltage_disconnect"
  #define MQTT_TOPIC_BATTERY_LOW_VOLTAGE_RECONNECT            MQTT_TOPIC_ROOT "battery_settings_low_voltage_reconnect"
  #define MQTT_TOPIC_BATTERY_OVER_VOLTAGE_DISCONNECT          MQTT_TOPIC_ROOT "battery_settings_over_voltage_disconnect"
  #define MQTT_TOPIC_BATTERY_OVER_VOLTAGE_RECONNECT           MQTT_TOPIC_ROOT "battery_settings_over_voltage_reconnect"
  #define MQTT_TOPIC_BATTERY_UNDER_VOLTAGE_RESET              MQTT_TOPIC_ROOT "battery_settings_under_voltage_reset"
  #define MQTT_TOPIC_BATTERY_UNDER_VOLTAGE_SET                MQTT_TOPIC_ROOT "battery_settings_under_voltage_set"
  #define MQTT_TOPIC_MIN_PV_VOLTAGE_TODAY                     MQTT_TOPIC_ROOT "stats_pv_max_voltage"
  #define MQTT_TOPIC_MAX_PV_VOLTAGE_TODAY                     MQTT_TOPIC_ROOT "stats_pv_min_voltage"
  #define MQTT_TOPIC_BATTERY_RATED_VOLTAGE                    MQTT_TOPIC_ROOT "battery_settings_rated_voltage"
  #define MQTT_TOPIC_BATTERY_TYPE                             MQTT_TOPIC_ROOT "battery_settings_type"
  #define MQTT_TOPIC_BATTERY_CAPACITY                         MQTT_TOPIC_ROOT "battery_settings_capacity"
  #define MQTT_TOPIC_BATTERY_EQUALIZATION_DURATION            MQTT_TOPIC_ROOT "battery_settings_equalization_duration"
  #define MQTT_TOPIC_BATTERY_BOOST_DURATION                   MQTT_TOPIC_ROOT "battery_settings_boost_duration"
  #define MQTT_TOPIC_BATTERY_TEMPERATURE_COMPENSATION_COEFF   MQTT_TOPIC_ROOT "battery_settings_temperature_compensation_coeff"
  #define MQTT_TOPIC_BATTERY_MANAGEMENT_MODE                  MQTT_TOPIC_ROOT "battery_settings_management_mode"
  #define MQTT_TOPIC_STAT_ENERGY_CONSUMED_TOTAL               MQTT_TOPIC_ROOT "stats_consumption_total"
  // internal
  #define MQTT_TOPIC_INTERNAL_STATUS                          MQTT_TOPIC_ROOT "internal_status"
  //action
  #define MQTT_TOPIC_UPDATE_ALL_CONTROLLER_DATA               MQTT_TOPIC_ROOT "internal_update_all"
#endif

The Cables are like the Manual for ESP32 WRROOM 38 PIN.
The ESP32 find no connection to the Charging Controller.

This is the Output of the Serial Console:

++ SETTING UP Local Time
Connecting .........OK
My NOW is: 2023-03-08 16:39:47
++ SETTING UP MQTT
Connecting OK
++ SETTING UP Solar controller
Synchronize NTP time with controller
Get all values
Sync all values
WARNING 16 RT var. are not synced
WARNING 24 ST var. are not synced

Update Solar-Tracer Error[16] 226
WARNING 16 RT var. are not synced
Update Solar-Tracer Error[16] 226
WARNING 17 RT var. are not synced
Update Solar-Tracer OK
WARNING 16 RT var. are not synced
Update Solar-Tracer OK
WARNING 16 RT var. are not synced
Update Solar-Tracer OK
WARNING 13 RT var. are not synced
Update Solar-Tracer OK
WARNING 5 RT var. are not synced
Update Solar-Tracer Error[16] 226
WARNING 5 RT var. are not synced

If someone can help, it would be nice.
Thank You.

[romew137]

I tried it now with the binaries SolarTracerBlynk_3.0.4_esp32dev_FULL.bin 0x000 first and SolarTracerBlynk_3.0.8_esp32dev_mqtt.bin 0x10000 second. i updated all the values on 192.168.4.1 and you see all the values of mqtt on the picture. They are all wrong.
I tried with an other esp32 and max485 board, but nothing changed.
Maybe someone can help me please.
Thank you

[romew137]

I found the Problem by myself. The Problem was, that I connected the ground of the Controller togehter with the ESP32 and the MAX485 (like in the documentation). Now I only connected the Ground from ESP32 to MAX485 and it works without a Problem.
Maybe you could revise the documentation.

[Bettapro]

Glad to read you solved the problem.
Actually, GROUND of ESP32, MAX485 and Solar tracer should be connected togheter to avoid ground loops, so it's a little weird it worked doing that.

Probably some EPEVER solar tracer has different designs, I've search a little https://forum.arduino.cc/t/reading-solar-charger-com-via-modbus-max485-problem/697035/16 .

The problem is that many instructions relate to having the ground connected. The AN series is a common negative series, maybe that has something to do with the ground issue but I dont really know.

Do you have a model ending with "N" (common negative) ? if not, it confirms the sentence above

[romew137]

I have a EPEVER MPPT XTRA-N XTRA4415N. I think this could be the Problem.