[rrd-users] Summarize minute values into hourly values

A Darren Dunham ddunham at taos.com
Fri Feb 18 21:22:44 CET 2011

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.


More information about the rrd-users mailing list