solaredge_modbus
solaredge_modbus is a python library that collects data from SolarEdge inverters over Modbus RTU or Modbus TCP.
Installation
To install, either clone this project and install using setuptools:
python3 setup.py install
or install the package from PyPi:
pip3 install solaredge_modbus
Usage
The script example.py provides a minimal example of connecting to and displaying all registers from a SolarEdge power inverter over Modbus TCP.
usage: example.py [-h] [--timeout TIMEOUT] [--unit UNIT] [--json] host port
positional arguments:
host Modbus TCP address
port Modbus TCP port
optional arguments:
-h, --help show this help message and exit
--timeout TIMEOUT Connection timeout
--unit UNIT Modbus device address
--json Output as JSON
Output:
Inverter(10.0.0.123:1502, connectionType.TCP: timeout=1, retries=3, unit=0x1):
Registers:
Manufacturer: SolarEdge
Model: SE3500H-RW000BNN4
Type: Single Phase Inverter
Version: 0004.0009.0030
Serial: 123ABC12
Status: Producing
Temperature: 49.79°C
Current: 8.93A
Voltage: 240.20V
Frequency: 50.00Hz
Power: 2141.80W
Power (Apparent): 2149.60VA
Power (Reactive): 183.20VAr
Power Factor: 99.69%
Total Energy: 3466757Wh
DC Current: 5.68A
DC Voltage: 382.50V
DC Power: 2173.50W
Passing --json returns:
{
"c_manufacturer": "SolarEdge",
'c_model': 'SE3500H-RW000BNN4',
'c_version': '0004.0009.0030',
'c_serialnumber': '123ABC12',
'c_deviceaddress': 1,
'c_sunspec_did': 101,
'current': 895,
'l1_current': 895,
'l2_current': False,
'l3_current': False,
'current_scale': -2,
'l1_voltage': 2403,
'l2_voltage': False,
'l3_voltage': False,
'l1n_voltage': False,
'l2n_voltage': False,
'l3n_voltage': False,
'voltage_scale': -1,
'frequency': 50003,
'frequency_scale': -3,
'power_ac': 21413,
'power_ac_scale': -1,
'power_apparent': 21479,
'power_apparent_scale': -1,
'power_reactive': 16859,
'power_reactive_scale': -2,
'power_factor': 9969,
'power_factor_scale': -2,
'energy_total': 3466757,
'energy_total_scale': 0,
'current_dc': 5678,
'current_dc_scale': -3,
'voltage_dc': 3826,
'voltage_dc_scale': -1,
'power_dc': 21726,
'power_dc_scale': -1,
'temperature': 4979,
'temperature_scale': -2,
'status': 4,
'vendor_status': 0
}
Note that if kWh meters or batteries are connected to your inverter, these will also be presented in the JSON output.
A second script, example_influxdb.py provides an example InfluxDB writer. It connects to an inverter over Modbus TCP, and writes inverter, battery and meter values to an InfluxDB every second.
usage: example_influxdb.py [-h] [--timeout TIMEOUT] [--unit UNIT] [--interval INTERVAL] [--influx_host INFLUX_HOST] [--influx_port INFLUX_PORT] [--influx_db INFLUX_DB]
[--influx_user INFLUX_USER] [--influx_pass INFLUX_PASS]
host port
positional arguments:
host Modbus TCP address
port Modbus TCP port
optional arguments:
-h, --help show this help message and exit
--timeout TIMEOUT Connection timeout
--unit UNIT Modbus device address
--interval INTERVAL Update interval
--influx_host INFLUX_HOST
InfluxDB host
--influx_port INFLUX_PORT
InfluxDB port
--influx_db INFLUX_DB
InfluxDB database
--influx_user INFLUX_USER
InfluxDB username
--influx_pass INFLUX_PASS
InfluxDB password
Connecting
If you wish to use Modbus TCP the following parameters are relevant:
host = IP or DNS name of your Modbus TCP device, required
port = TCP port of the Modbus TCP device, required
unit = Modbus device address, default=1, optional
While if you are using a Modbus RTU connection you can specify:
device = path to serial device, e.g. /dev/ttyUSB0, required
baud = baud rate of your device, defaults to product default, optional
unit = Modbus device address, defaults to 1, optional
Connecting to the inverter:
>>> import solaredge_modbus
# Inverter over Modbus TCP
>>> inverter = solaredge_modbus.Inverter(host="10.0.0.123", port=1502)
# Inverter over Modbus RTU
>>> inverter = solaredge_modbus.Inverter(device="/dev/ttyUSB0", baud=115200)
Test the connection, remember that only a single connection at a time is allowed:
>>> inverter.connect()
True
>>> inverter.connected()
True
While it is not necessary to explicitly call connect() before reading registers, you should do so before calling connected(). The connection can be closed by calling disconnect().
Printing the class yields basic device parameters:
>>> inverter
Inverter(10.0.0.123:1502, connectionType.TCP: timeout=1, retries=3, unit=0x1)
Reading Registers
Reading a single input register by name:
>>> inverter.read("current")
{
'current': 895
}
Read all input registers using read_all():
>>> inverter.read_all()
{
'c_manufacturer': 'SolarEdge',
'c_model': 'SE3500H-RW000BNN4',
'c_version': '0004.0009.0030',
'c_serialnumber': '123ABC12',
'c_deviceaddress': 1,
'c_sunspec_did': 101,
'current': 895,
'l1_current': 895,
'l2_current': False,
'l3_current': False,
'current_scale': -2,
'l1_voltage': 2403,
'l2_voltage': False,
'l3_voltage': False,
'l1n_voltage': False,
'l2n_voltage': False,
'l3n_voltage': False,
'voltage_scale': -1,
'power_ac': 21413,
'power_ac_scale': -1,
'frequency': 50003,
'frequency_scale': -3,
'power_apparent': 21479,
'power_apparent_scale': -1,
'power_reactive': 16859,
'power_reactive_scale': -2,
'power_factor': 9969,
'power_factor_scale': -2,
'energy_total': 3466757,
'energy_total_scale': 0,
'current_dc': 5678,
'current_dc_scale': -3,
'voltage_dc': 3826,
'voltage_dc_scale': -1,
'power_dc': 21726,
'power_dc_scale': -1,
'temperature': 4979,
'temperature_scale': -2,
'status': 4,
'vendor_status': 0
}
Register Details
If you need more information about a particular register, to look up the units or enumerations, for example:
>>> inverter.registers["current"]
# address, length, type, datatype, valuetype, name, unit, batching
(
40071,
1,
<registerType.HOLDING: 2>,
<registerDataType.UINT16: 3>,
<class 'int'>,
'Current',
'A',
2
)
>>> inverter.registers["status"]
# address, length, type, datatype, valuetype, name, unit, batching
(
40107,
1,
<registerType.HOLDING: 2>,
<registerDataType.UINT16: 3>,
<class 'int'>,
'Status',
['Undefined', 'Off', 'Sleeping', 'Grid Monitoring', 'Producing', 'Producing (Throttled)', 'Shutting Down', 'Fault', 'Standby'],
2
)
Multiple Inverters
If you have multiple inverters connected together over the RS485 bus, you can query the individual inverters using Modbus RTU or Modbus TCP by instantiating multiple inverter objects:
# Master inverter over Modbus TCP
>>> master = solaredge_modbus.Inverter(host="10.0.0.123", port=1502, unit=1)
# Second inverter using master's connection
>>> second = solaredge_modbus.Inverter(parent=master, unit=2)
# Third inverter
>>> third = solaredge_modbus.Inverter(parent=master, unit=3)
Meters & Batteries
SolarEdge supports various kWh meters and batteries, and exposes their registers through a set of pre-defined registers on the inverter. The number of supported registers is hard-coded, per the SolarEdge SunSpec implementation, to three meters and two batteries. It is possible to query their registers:
>>> inverter.meters()
{
'Meter1': Meter1(10.0.0.123:1502, connectionType.TCP: timeout=1, retries=3, unit=0x1)
}
>>> meter1 = inverter.meters()["Meter1"]
>>> meter1
Meter1(10.0.0.123:1502, connectionType.TCP: timeout=1, retries=3, unit=0x1)
>>> meter1.read_all()
{
'c_manufacturer': 'SolarEdge',
'c_model': 'PRO380-Mod',
'c_option': 'Export+Import',
'c_version': '2.19',
'c_serialnumber': '12312332',
'c_deviceaddress': 1,
'c_sunspec_did': 203,
'current': -13,
...
}
Or similarly for batteries:
>>> inverter.batteries()
{
'Battery1': Battery(10.0.0.123:1502, connectionType.TCP: timeout=1, retries=3, unit=0x1)
}
>>> battery1 = inverter.batteries()["Battery1"]
>>> battery1
Battery1(10.0.0.123:1502, connectionType.TCP: timeout=1, retries=3, unit=0x1)
>>> battery1.read_all()
{
...
}
Calling meters() or batteries() on an inverter object is the recommended way of instantiating their objects. This way, checking for available devices, register offsetting, and sharing of the pymodbus connection is taken care of. If you want to to create a meter or battery object independently, do the following:
# Meter #1 via the existing inverter connection
>>> meter1 = solaredge_modbus.Meter(parent=inverter, offset=0)
# Meter #2 over Modbus TCP, without a parent connection
>>> meter2 = solaredge_modbus.Meter(host="10.0.0.123", port=1502, offset=1)
# Battery #1 via the existing inverter connection
>>> battery1 = solaredge_modbus.Battery(parent=inverter, offset=0)
# Battery #1 over Modbus TCP, without a parent connection
>>> battery1 = solaredge_modbus.Battery(host="10.0.0.123", port=1502, offset=1)
There are two points to consider when doing this. You will need to manually pass the parent and offset parameters, which take care of sharing an existing Modbus connection, and set the correct register addresses. Use offset 0 for the first device, 1 for the second, and 2 for the third. If you do not pass a parent inverter object, you will need to supply connection parameters just like those required by the inverter object. Remember that a second Modbus TCP or Modbus RTU connection will fail when already in use by another inverter, meter, or battery object.
Note: as I do not have access to a compatible kWh meter nor battery, this implementation is not thoroughly tested. If you have issues with this functionality, please open a GitHub issue.
Contributing
Contributions are more than welcome.