growatt-pico-reader 0.0.1

A tool for reading Growatt inverter data on Raspberry Pi Pico

Growatt pico reader

Micropython library for reading data from Growatt inverter using RS485 port. Library is build for Raspberry pi pico / pico w and RS485 to TTL module.

Installation

1. Using PyPi package (recommended)

In Thonny IDE go to Tools -> Manage Packages and search for growatt_pico_reader

2. Copy python file

Copy growatt_pico_reader/growatt_pico_reader_py file to your root directory on pi pico.

Usage

Import package

from growatt_pico_reader import *

Initial setup (not required)

set_tx_pin(pin_number) # change TX port (default is 0)
set_rx_pin(pin_number) # change RX port (default is 1)
set_ctrl_pin(pin_number) # change RS485 transceiver control pin (default is 1)
set_slave_address(address) # change growatt address (default is 1) (address can be set on inverter LCD display)

Read data

Read All Data:

all_data = get_all()
print(all_data)

Read specific data:

grid_frequency = get_Fac()
print(grid_frequency)

All available data to read:

Register Address	Variable Short	Description	Unit	Function Call	Note
0	Inverter Status	Inverter run state	-	get_inverter_status()	0:waiting, 1:normal, 3:fault
1-2	Ppv	Input power	W	get_Ppv()
3	Vpv1	PV1 voltage	V	get_Vpv1()
4	PV1Curr	PV1 input current	A	get_PV1Curr()
5-6	Ppv1	PV1 input power	W	get_Ppv1()
35-36	Pac	Output power	W	get_Pac()
37	Fac	Grid frequency	Hz	get_Fac()
38	Vac1	Three/single phase grid voltage	V	get_Vac1()
39	Iac1	Three/single phase grid output current	A	get_Iac1()
40-41	Pac1	Three/single phase grid output watt VA	VA	get_Pac1()
42	Vac2	Three phase grid voltage	V	get_Vac2()
43	Iac2	Three phase grid output current	A	get_Iac2()
44-45	Pac2	Three phase grid output power	VA	get_Pac2()
46	Vac3	Three phase grid voltage	V	get_Vac3()
47	Iac3	Three phase grid output current	A	get_Iac3()
48-49	Pac3	Three phase grid output power	VA	get_Pac3()
50	Vac RS	Three phase grid voltage	V	get_Vac_RS()
51	Vac ST	Three phase grid voltage	V	get_Vac_ST()
52	Vac TR	Three phase grid voltage	V	get_Vac_TR()
53-54	Eac today	Today generate energy	kWh	get_Eac_today()
55-56	Eac total	Total generate energy	kWh	get_Eac_total()
57-58	Time total	Work time total	s	get_Time_total()
59-60	Epv1_today	PV1Energy today	kWh	get_Epv1_today()
61-62	Epv1_total	PV1Energy total	kWh	get_Epv1_total()
91-92	Epv_total	PV Energy total	kWh	get_Epv_total()
93	Temp1	Inverter temperature	°C	get_Temp1()
101	RealOPPercent	Real Output power Percent	%	get_RealOPPercent()
105	Fault Maincode	Inverter fault maincode	-	get_FaultMaincode()
1009-1010	Pdischarge1	Discharge power	W	get_Pdischarge1()
1011-1012	Pcharge1	Charge power	W	get_Pcharge1()
1013	Vbat	Battery voltage	V	get_Vbat()
1014	SOC	State of charge Capacity	%	get_SOC()
1021-1022	PactouserTotal	AC power to user total	W	get_PactouserTotal()
1023-1024	Pac to grid	AC power to grid	W	get_Pac_to_grid()
1029-1030	Pactogrid total	AC power to grid total	W	get_Pactogrid_total()
1040	Battery Temperature	Battery Temperature	°C	get_BatteryTemperature()
1044-1045	Etouser_today	Energy to user today	kWh	get_Etouser_today()
1046-1047	Etouser_total	Energy to user total	kWh	get_Etouser_total()
1048-1049	Etogrid_today	Energy to grid today	kWh	get_Etogrid_today()
1050-1051	Etogrid_total	Energy to grid total	kWh	get_Etogrid_total()
1052-1053	Edischarge1_today	Discharge energy1 today	kWh	get_Edischarge1_today()
1054-1055	Edischarge1_total	Total discharge energy1	kWh	get_Edischarge1_total()
1056-1057	Echarge1_today	Charge1 energy today	kWh	get_Echarge1_today()
1058-1059	Echarge1_total	Charge1 energy total	kWh	get_Echarge1_total()
1060-1061	ELocalLoad_Today	Local load energy today	kWh	get_ELocalLoad_Today()
1062-1063	ELocalLoad_Total	Local load energy total	kWh	get_ELocalLoad_Total()
1124-1125	AC Charge Energy today	AC Charge Energy today	kWh	get_ACCharge_today()
1128-1129	AC Charge Power	AC Charge Power	W	get_ACChargePower()
1137-1138	Esystem_today	System electric energy today	kWh	get_Esystem_today()
1139-1140	Esystem_total	System electric energy total	kWh	get_Esystem_total()
1141-1142	Eself_today	self electric energy today	kWh	get_Eself_today()
1143-1144	Eself_total	self electric energy total	kWh	get_Eself_total()
1145-1146	PSystem	System power	W	get_PSystem()
1147-1148	PSelf	self power	W	get_PSelf()

Example Hardware Setup

On growatt inverter on LCD display set RS485 mode to VPP. Pins 5 (modbus A) and 4 (modbus B) are used on RJ45 connector.

Used resources:

• For parsing data was used this document: Growatt-Inverter-Modbus-RTU-Protocol-II-V1-24-English-new.pdf
• Base functionality was inspired from TheTrueRandom/growatt-modbus

License and contributing

Project is licensed under MIT license. Feel free to open a PR for new features (e.g. more parsed data)