Alex, On 2 Sep 2007, at 13:12, Alex van den Bogaerdt wrote:
> The way you set it up means that the database stores ticks per second, > not kWh or similar. Yes. > Suppose you see 60 of such ticks in a minute, that's 1 tick per > second, thus 1.25W/s. This is what RRDtool should display. This > means you should multiply by 1.25, not by 1250. > > If you only see one such tick per minute, that's 1/60 tick per second, > thus 1/60 * 1.25 = 1.25/60 = 0.0208333... = 20.8333... mW/s. > > Seeing "m" for milli isn't bad, it's expected. That's because you > look per second, not per hour. Try multiplying by 3600. Ah... hmm.... OK have tried multiplying by 3600, and here's what I'm getting: http://www.biased.org/misc/tech_probs/leccyday.png Looks a bit high to me now? Though the tumble drying figure (first spike) looks more correct at nearly 3kWh. But now I'm seeing "k" which I doubt is 3,000kWh. Should I be using Wh instead of kWh? I need to make 100% sure, as it's basically saying I'm using 500 watts continuously on average. Which is a lot! :( > Sidenote: Watt is already something per second (Joule per second). > What you are probably measuring is kWh, not kW. See wikipedia. Yup you're right, it's kWh not kW. My bad. > I am also monitoring this usage. Unfortunately I have to do so by > hand, as of yet I have not found a way to interface this :-( Yeah, me too, until the law required my electricity company to replace my old meter which had a disc - the new one has no disc, but has a flashing light instead for some reason. So my friend was able to make a sensor to allow my server to record the flashes. Thanks very much for your time! Regards - Piers _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
