[rrd-users] Calculation that is a bit over my head.

Steve Shipway s.shipway at auckland.ac.nz
Mon Nov 18 01:55:29 CET 2013

If you have a 0 and a 1 logged, and your graph is for one day, then you could get your total energy use by



(This is now a dataset of 1 or 0)


(This is now a dataset of Watts)


(This is an intermediate dataset holding 86400xWatts.  This is necessary because you cannot do arithmetic in a VDEF)


(This is a single value of  (average power over a day, multiplied by 86400).  Since 86400 is the number of seconds in a day, this value is therefore the total energy consumption for the day in Joules.)


Of course the above can be simplified.  If you want in kWh rather than J you can divide by 3600000 …





Steve Shipway

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From: rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch [mailto:rrd-users-bounces+s.shipway=auckland.ac.nz at lists.oetiker.ch] On Behalf Of Jan Johansson
Sent: Monday, 18 November 2013 12:35 p.m.
Cc: rrd-users at lists.oetiker.ch
Subject: Re: [rrd-users] Calculation that is a bit over my head.


>I would suggest to set the DS to GAUGE


>and then log 3000 when your heater is on and 0 when it is off







The  DS is set to gauge, but I cannot really change the value, as the controller in use actually talks to RRD directly, so I only have  control over the “read side” of things.

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