[rrd-users] help required to graph photovoltaic electricity savings

Steve Shipway s.shipway at auckland.ac.nz
Thu Nov 29 03:52:11 CET 2012

> I'd suggest using four DS:
> (1) PV 0700-1900
> (2) PV 1900-0700
> (3) Supply 0700-1900
> (4) Supply 1900-0700

I would only use two -- the PV and Supply.

This is because you can still calculate averages over a calculated DS in RRDTool to get averages for a subset of the time, and time is an availiable function of the DS.

As an example of this, the Routers2 frontend for MRTG uses a time function to present the averages for the 'working day' periods in addition to the 24h averages, without having to obtain an additional DS.

Having the data in a single DS would make it much easier to load, and allow 24h graphs without having to do merging magic...


Steve Shipway
ITS Unix Services Design Lead
University of Auckland, New Zealand
Floor 1, 58 Symonds Street, Auckland
Phone: +64 (0)9 3737599 ext 86487
DDI: +64 (0)9 924 6487
Mobile: +64 (0)21 753 189
Email: s.shipway at auckland.ac.nz
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