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