python-pylontech 0.0.3

Interfaces with Pylontech Batteries using RS485 protocol

python-pylontech

Python lib to talk to pylontech lithium batteries (US2000, US3000, ...) using RS485

What is this lib ?

This lib is meant to talk to Pylontech batteries using RS485. Sadly the protocol over RS485 is not some fancy thing like MODBUS but their own crappy protocol.

How to use this lib ?

First of all, you need a USB to RS485 converter. They are many available online for some bucks.

Then, you simply need to import the lib and start asking values:

>>> import pylontech
>>> p = pylontech.Pylontech()
>>> print(p.get_values())
Container: 
    CommandValue = 1
    NumberOfCells = 15
    CellVoltages = ListContainer: 
        3.325
        3.326
        3.325
        3.325
        3.325
        3.325
        3.325
        3.324
        3.324
        3.324
        3.326
        3.326
        3.326
        3.326
        3.326
    NumberOfTemperatures = 5
    AverageBMSTemperature = 30.01
    GroupedCellsTemperatures = ListContainer: 
        29.61
        29.61
        29.61
        29.61
    Current = 0
    Voltage = 49.878
    RemainingCapacity = 49.0
    TotalCapacity = 50.0
    CycleNumber = 0
>>> print(p.get_system_parameters())
Container: 
    CellHighVoltageLimit = 3.7
    CellLowVoltageLimit = 3.05
    CellUnderVoltageLimit = 2.9
    ChargeHighTemperatureLimit = 33.41
    ChargeLowTemperatureLimit = 26.21
    ChargeCurrentLimit = 10.2
    ModuleHighVoltageLimit = 54.0
    ModuleLowVoltageLimit = 46.0
    ModuleUnderVoltageLimit = 44.5
    DischargeHighTemperatureLimit = 33.41
    DischargeLowTemperatureLimit = 26.21
    DischargeCurrentLimit = -10.0

Dependencies

This lib depends on pyserial and the awesome construct lib.