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
DEF:onoff=myfile.rrd:myds:AVERAGE (This is now a dataset of 1 or 0) CDEF:powerinwatts=onoff,3000,* (This is now a dataset of Watts) CDEF:powertmp=powerinwatts,86400,* (This is an intermediate dataset holding 86400xWatts. This is necessary because you cannot do arithmetic in a VDEF) VDEF:totalenergy=powertmp,AVERAGE (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 _____ 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)9 923 6487 Mobile: +64 (0)21 753 189 Email: <mailto:s.ship...@auckland.ac.nz> s.ship...@auckland.ac.nz P Please consider the environment before printing this e-mail : 打印本邮件，将减少一棵树存活的机会 From: rrd-users-bounces+s.shipway=auckland.ac...@lists.oetiker.ch [mailto:rrd-users-bounces+s.shipway=auckland.ac...@lists.oetiker.ch] On Behalf Of Jan Johansson Sent: Monday, 18 November 2013 12:35 p.m. Cc: rrd-users@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 > >cheers >tobi Hello! 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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