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Access the Phocos CX/CXN-10/20/40 solar charge controller's logger.
...The disadvantages are: low current measurement accuracy (including fixed and variable offsets), high current and charge granularity, low voltage and temperature accuracy (-0.6% and -3 °C on author's unit); no daily logs after 1 week, too fast-acting overload fuse.
solargrapher is a minimalistic implementation of the ComLynx protocol, spoken by solar inverters made by Danfoss, IBC Solar et al.
It logs whatever data you deem interesting in rrd file and has a minimal example on how to produce graphs for a cgi-enables webserver from that.