Preliminary Status

Work in progress. ESPHome YAML config file and documentation are are not finalized yet.

EPEVER XTRA N Series MPPT Solar Charger ESPHome project

Read measurement values from the MPPT Solar Charger and write configuration values to the Solar Charger via RS485 (Modbus) using ESPHome.

Overview

           RS485 (Modbus)                  UART
┌─────────┐             ┌──────────┐               ┌───────────┐
│         │             │          │<----- RX ---->│           │
│         │<-----B- --->│  RS485   │<----- TX ---->│  ESP32    │
│  XTRA N │<---- A+ --->│  to TTL  │<----- GND --->│  with     │
│         │<--- GND --->│  module  │<-- 3.3 VCC -->│  esphome  │
│         │             │          │               │           │
└─────────┘             └──────────┘               └───────────┘

Limitations

At the moment only read operations are implemented. Write operations are not implemented yet.

Implemented Modbus Registers

Number	Name	Description
A1	Over Temperature Device	True or False. According to the manual, the controller will stop operation if 85°C is exceeded
A3	PV Input Voltage	PV array voltage
A4	PV Input Current	PV array current
A5 / A6	PV Input Power	PV array power
A11	Battery Temperature	Measurement of the battery sensor (if connected). Otherwise 25°C
A12	Device Temperature	Temperature insinde of controller
A13	Battery Remaining Capacity	Remaining capacity in %
A14	Battery Rated System Voltage	Battery system rated voltage
A28 / A29	PV Generated Energy Day	Generated PV energy, reset at 00:00, using internal clock
A30 / A31	PV Generated Energy Month	Generated PV energy, reset first day of the month at 00:00, using internal clock
A32 / A33	PV Generated Energy Year	Generated PV energy, reset first of January at 00:00, using internal clock
A34 / A34	PV Generated Energy Total	Total generated PV energy
A36	Battery Voltage	Current measured battery voltage
A37 / A38	Battery Current	Current measured battery current
B6	Temperature Compensation Coefficient	Configured compensation factor
B7	Over Voltage Disconnect Voltage
B8	Charging Limit Voltage
B9	Over Voltage Reconnect Voltage
B11	Boost Charging Voltage
B12	Float Charging Voltage
B13	Boost Reconnect Charging Voltage
B14	Low voltage Reconnect Voltage
B15	Under Voltage Warning Recover Voltage
B16	Under Voltage Warning Voltage
B17	Low Voltage Disconnect Voltage
B18	Discharging Limit Voltage

Supported devices

This project is based on version 2.6 of the "XTRA, TRIRON, TracerAN Series Controller Communication Instruction" document. You can request the Modbus communication documentation via the official Support ([email protected]).

Tested with a XTRA 4415N device.