Assorted utility functions for working with data downloaded from Selectronics' SP-LINK programme which communicates with their solar inverter controllers.

Latest release 20220918:

• SPLinkData.plot: rename key_specs keyword parameter to mandatory posiitional data_specs parameter.
• SPLinkData.resolve: accept multiple specification strings.
• New SPLinkData.plot_data_from_spec(start,stop,data_spec,...) method to return a list of PlotSeries instances.
• SPLinkData.plot: drop mode param (unused).
• SPLinkData.plot: process plot data and annotate with style, call Axes.plot or Axes.stackplot instead of DataFrame.plot.
• SPLinkData.plot: axes() now has a better default size, drop our own default size.
• SPLinkData.plot: new optional ax_title parameter to specify a title for the axes.
• SPLinkCommand.cmd_plot: make pseudo-data "POWER" the default and special case a stack plot for "POWER".

I use this to gather and plot data from my solar inverter.

Function main(argv=None)

SP-Link command line mode.

Class SPLinkCommand(cs.timeseries.TimeSeriesBaseCommand, cs.cmdutils.BaseCommand)

Command line to work with SP-Link data downloads.

Command line usage:

Usage: splink [-d spdpath] [-n] subcommand...
    -d spdpath  Specify the directory containing the SP-Link downloads
                and time series. Default from $SPLINK_DATADIR,
                or '.'.
    -n          No action; recite planned actions.
  Subcommands:
    export dataset
      Export the named dataset in the original CSV form.
      Available datasets: DailySummaryData DetailedData
    fetch [-F rsync-source] [-nx] [-- [rsync-options...]]
      Rsync everything from rsync-source into the downloads area.
      -F    Fetch rsync source, default from $SPLINK_FETCH_SOURCE.
      -n    Passed to rsync. Just more convenient than putting it at the end.
      -x    Delete source files.
    help [-l] [subcommand-names...]
      Print the full help for the named subcommands,
      or for all subcommands if no names are specified.
      -l  Long help even if no subcommand-names provided.
    import [-d dataset,...] [-n] [sp-link-download...]
      Import CSV data from the downloads area into the time series data.
      -d datasets       Comma separated list of datasets to import.
                        Default datasets: DailySummaryData DetailedData EventData
      -f                Force. Import datasets even if already marked as
                        imported.
      -n                No action. Recite planned imports.
      sp-link-download  Specify specific individual downloads to import.
                        The default is any download not tagged as already
                        imported.
    info
      Report infomation about the time series stored at tspath.
    plot [-e event,...] [-f] [-o imagepath] [--show] start-time [stop-time] {mode|[dataset:]{glob|field}}...
      Plot the data from specified fields for the specified time range.
      Options:
        --bare          Strip axes and padding from the plot.
        -e events,...   Display the specified events.
        -f              Force. Overwirte the image path even if it exists.
        --stacked       Stack graphed values on top of each other.
        -o imagepath    Write the plot to imagepath.
                        If not specified, the image will be written
                        to the standard output in sixel format if
                        it is a terminal, and in PNG format otherwise.
        --show          Open the image path with "open".
        --tz tzspec     Skew the UTC times presented on the graph
                        to emulate the timezone specified by tzspec.
                        The default skew is the system local timezone.
        start-time      An integer number of days before the current time
                        or any datetime specification recognised by
                        dateutil.parser.parse.
        stop-time       Optional stop time, default now.
                        An integer number of days before the current time
                        or any datetime specification recognised by
                        dateutil.parser.parse.
        mode            A named graph mode, implying a group of fields.
    pull [-d dataset,...] [-F rsync-source] [-nx]
      Fetch and import data.
      -d dataset,...
            Specify the datasets to import.
      -F    Fetch rsync source, default from $SPLINK_FETCH_SOURCE.
      -n    No action; pass -n to rsync. Just more convenient than putting it at the end.
      -x    Delete source files.

Class SPLinkCSVDir(cs.fs.HasFSPath)

A class for working with SP-Link data downloads, referring to a particular PerformanceData* download directory.

Class SPLinkData(cs.fs.HasFSPath, cs.resources.MultiOpenMixin, cs.context.ContextManagerMixin)

A directory containing SP-LInk data.

This contains:

• downloads: a directory containing copies of various SP-Link downloads i.e. this contains directories named PerformanceData_*.
• events.db: accrued event data from the EventData CSV files
• DailySummaryData: an SPLinkDataDir containing accrued data from the DailySummaryData CSV files
• DetailedData: an SPLinkDataDir containing accrued data from the DetailedData CSV files

Class SPLinkDataDir(cs.timeseries.TimeSeriesDataDir, cs.timeseries.TimeSeriesMapping, builtins.dict, cs.resources.MultiOpenMixin, cs.context.ContextManagerMixin, cs.fs.HasFSPath, cs.configutils.HasConfigIni, cs.timeseries.HasEpochMixin, cs.timeseries.TimeStepsMixin)

A TimeSeriesDataDir to hold log data from an SP-Link CSV data download. This holds the data from a particular CSV log such as 'DetailedData'. The SPLinkData class manages a couple of these and a downloads subdirectory and an events SQLTags.

Method SPLinkDataDir.__init__(self, dirpath, dataset: str, step: int, policy=None, **kw): Initialise the SPLinkDataDir.

Parameters:

• dirpath: the pathname of the directory holding the downloaded CSV files
• dataset: which CSV file populates this time series, eg 'DetailedData'
• step: optional time series step size, default SPLinkDataDir.DEFAULT_LOG_FREQUENCY, which comes from SPLinkCSVDir.DEFAULT_LOG_FREQUENCY
• policy: optional TimespanPolicyinstance; if omitted anTimespanPolicyYearlyinstance will be made Other keyword arguments are passed to theTimeSeriesDataDir` initialiser.

Class SPLinkDataFileInfo(builtins.tuple)

SPLinkDataFileInfo(fspath, sitename, dataset, unixtime, dotext)

Method SPLinkDataFileInfo.__new__(_cls, fspath, sitename, dataset, unixtime, dotext): Create new instance of SPLinkDataFileInfo(fspath, sitename, dataset, unixtime, dotext)

Function ts2001_unixtime(tzname=None)

Convert an SP-Link seconds-since-2001-01-01-local-time offset into a UNIX time.

Release Log

Release 20220918:

• SPLinkData.plot: rename key_specs keyword parameter to mandatory posiitional data_specs parameter.
• SPLinkData.resolve: accept multiple specification strings.
• New SPLinkData.plot_data_from_spec(start,stop,data_spec,...) method to return a list of PlotSeries instances.
• SPLinkData.plot: drop mode param (unused).
• SPLinkData.plot: process plot data and annotate with style, call Axes.plot or Axes.stackplot instead of DataFrame.plot.
• SPLinkData.plot: axes() now has a better default size, drop our own default size.
• SPLinkData.plot: new optional ax_title parameter to specify a title for the axes.
• SPLinkCommand.cmd_plot: make pseudo-data "POWER" the default and special case a stack plot for "POWER".

Release 20220806: Faster events prescan during import (it appears that timestamps are unique), less import noise.

Release 20220805:

• SPLinkCommand.cmd_plot: new --bare option to strip legends, axes etc from a graph.
• Assorted small internal changes.

Release 20220626:

• Lots of updates to the import process.
• SPLinkCommand: new cmd_pull, combining fetch and import.
• SPLinkData.plot: rework the key matching and plot data gathering, pass the utcoffset to the subsidiary timeseries plot call.
• SPLinkDataDir.to_csv: shim TimeSeriesDataDir,to_csv to reproduce the SP-Link download CSV format.
• SPLinkCommand.cmd_export: new "splink export" command to export data in SP-Link CSV format.
• Many minor updates.

Release 20220606: Initial PyPI release.