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List:       rrd-users
Subject:    Re: [rrd-users] Summarize minute values into hourly values
From:       "Robert Conway" <rjconway () bigpond ! com>
Date:       2011-02-18 23:21:43
Message-ID: 001401cbcfc2$9ac92670$d05b7350$ () bigpond ! com
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This link should provide the exact setup you require.   See "How to"  use
google translate.   http://wiki.temperatur.nu/index.php/Huvudsida

It sets up rrdtools for pulse counting of power usage.  These guy's also
sell the pulse detector.

rob


-----Original Message-----
From: rrd-users-bounces+rjconway=bigpond.com@lists.oetiker.ch
[mailto:rrd-users-bounces+rjconway=bigpond.com@lists.oetiker.ch] On Behalf
Of A Darren Dunham
Sent: Saturday, 19 February 2011 7:23 AM
To: rrd-users@lists.oetiker.ch
Subject: Re: [rrd-users] Summarize minute values into hourly values

On Fri, Feb 18, 2011 at 11:55:59AM -0800, JoeSpam8 wrote:
> 
> >OK, I think part of your problem is that you don't appear to 
> >understand the units in use - or you are just sloppy in your use of 
> >units. Either way, that is a recipe for problems.
> 
> >I assume you mean, your power meter will show you between 20 and 60 
> >watts. Watts/minute doesn't make sense as watts is a unit of power
> >(energy/time) so dividing by time again would give you energy/time^2 
> >or rate of change of power.
> 
> OK, I think we talk about the same but let me clarify.
> 
> I have a pulse counter that counts the LED flashes on my households 
> power meter. Every pulse is a watt used.

No, that's not true.  A watt is a *rate*, just like a speed, so you don't
use them.

That's like saying something on your automobile flashes every time you use a
mile-per-hour.  

Instead, you get a pulse for every quantity of energy you consume.  That
unit could be joules or kW-hour or kW-seconds or W-hours.

--
Darren

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