development:calculations
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Using the DIN rail meters we do not get power or energy readings, but pulses for every consumed unit. Typically (depends on the meter) we get between 800 and 2.000 pulses for every KWh cosumed.
Measuring the time between two pulses we can calculate the power that was being drawn in the mean time:
power = 3,600*1,000/(<meter resolution in pulses/KWh>*<time between two pulses>)
e.g.:
p = 3,600*1,000/(2000*10) = 180 Watts (the units work out to (s/h)*1/((1/Wh) * s) = W)
rearranging it we can use the same formula to calculate the time between two pulses:
time between two pulses = 3,600*1,000/(<meter resolution>*<power>)
e.g.:
t = 3,600*1,000/(2000*150) = 12 s
development/calculations.1291285470.txt.gz · Zuletzt geändert: 2011/05/29 13:09 (Externe Bearbeitung)