We just had a power outage for about an hour, but in the Flukso graph the power has remained static on 330W. I suppose the Fluksometer didn't have the time to register 0W before losing its own power, is that right?
Would be nice to be able to correct some values manually ;)
The 330W flat line means that, on average, you consumed 330W during the interval. So your total energy consumption over this period will be correct. You only lost some granularity.
In reality the whole house was pitch dark for an hour so it is impossible that we consumed 0.33 kWh during that time period. I believe the level was 330 W when the power broke and since the Fluksometer didn't have any power itself it plots the graph as it would have remained on 330 W the time it was out of order. It should have been 0 W during that hour.
Except that the FLM internals are based on pulses, meaning energy, not power. So it simply cannot 'remember' the last power reading. What most likely will have happened is that you had a fairly high consumption in the 5mins right before the power outage which the FLM could not report to flukso.net. The power loss causes the daughter board to store the last counter reading. So the energy you used during these 5mins is still remembered. When power is restored the FLM loads the saved counters and starts putting timestamps on new counter values. The Flukso server will thus see a gap in readings combined with a counter gap. It does the power calculation by dividing these two values. Hence the averaging.
OK, makes sense. My utility now provides hourly readings and looking back at yesterday 19.00-20.00 shows 0 kWh and the difference between Flukso and the utility is 18.616 compared to 18.48 kWh. Not much to argue about. :)
This time I haven't had a power outage, but my ISP provider had some difficulties so the Flukso lost its wifi connection at 08.45 yesterday and today at 11.00 it was back on track. Once again I get a flat line between these two time stamps at a power level of 729 W. Flukso summarises yesterdays usage to 15.627 kWh, my utility says 17.06 kWh. I have to admit that I did unplugg/replugg the Flukso for a few seconds yesterday night trying to see if that was one of my problems.
So, even if I haven't lost power, it seems that the Fluksometer doesn't store that many values or did I ruin that with my hard reset last night?
Looking back at the last two days I get 38.32 kWh from my utility and about 38.09 from Flukso so I won't argue anymore :)
However I am curious when granularity is lost? My latest problem was more than 24 hours and my power outage was about 2 hours.
Now I have compared almost a full month with my utility on the very same meter. The difference comes down to 0.149 kWh so the accuracy is quite high. However it seems like you are discussing how the Fluksometer recovers and presents granularity after power outages and lost internet connections in the Installation section of the forum.