asked by David S. Banks on March 1, 2012
A
KWH is a cumulative measure. It measures use for a duration, so you can say that this appliance uses 500KWH for the year.

KWH = Watts * Hours/1000

In your case, the aquarium would have ideally registered as

4.4 (watts) * 48 (hours for 2 days)/1000 = 0.211 KWH

You are getting less KWH reading, so either you plugged it in for less than 48 hours, or that 4.4 Watts is some peak measure and the average is closer to 2.7 Watts.
Sitanshu Seth answered on March 28, 2012
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A
Your 0.13 KW/H is CUMULATIVE for those 2 days (48 hours). So for 30 days, you'd use 0.13*15 = 1.95 KW/H. For a rate of 0.10 per KW/H, you'd get \$0.195 per month - close to the \$0.31 per month you calculate based on the instantaneous 4.4 W

I agree with the previous answer - the 4.4W is likely a peak number (your heater was likely on?), your average is a bit lower.
Pieter answered on November 8, 2013
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