EPSolar Tracer python3 script

#!/usr/bin/env python3
# I could NOT have done this without a few different sources on the web but this is a simple working script to pull data off an EPSolar Tracer BN series charge controller. The EPSolar USB RS485 adapter is a lot of work so skip it and and get a cheap $3.50 USB to RS485 off Ebay and snip an end off an Ethernet cable.

from pymodbus.client.sync import ModbusSerialClient as ModbusClient
import serial
from pymodbus.pdu import ModbusRequest
from pymodbus.transaction import ModbusRtuFramer
from pymodbus.register_read_message import ReadHoldingRegistersResponse

client = ModbusClient(method='rtu', port='/dev/ttyUSB0', baudrate=115200, stopbits=1, bytesize=8, timeout=2)
client.connect()
print(client)

result = client.read_input_registers(0x3100,20, unit=1)

solarVoltage = float(result.registers[0] / 100.0)
solarCurrent = float(result.registers[1] / 100.0)
solarWatt = float(result.registers[2] / 100.0)
batteryVoltage = float(result.registers[4] / 100.0)
chargeCurrent = float(result.registers[5] / 100.0)
loadCurrent = float(result.registers[19] / 100.0)
# Do something with the data


print ("Solar Voltage", str (solarVoltage) + 'V')
print ("Solar Current", str (solarCurrent) + 'A')
print ("Current Watts", str (solarWatt) + 'W')
print ("Battery Voltage", str (batteryVoltage) +'V')
print ("Charge Current", str (chargeCurrent) + 'A')
print ("Load Power", str (loadCurrent) + 'W')
#print (result)
client.close()