I find Iammeter Web-based Monitoring is impressive and intuitive, but I do have one suggestion that might be useful.
I wish I could make a rectangular selection on the chart and the system would display the area-under-the-curve value, i.e. the cumulative value (of power) during that period of time.
Thanks for your suggestion.
We also think the first suggestion is useful, we will provide such a function in recent upgrading.
About the second suggestion ,
If you want to analyze the demand charge in 15mins interval ,please try this funciton.