I already read a lot about the rrd4j persistence and it is also clear to me that the service does “compress” the data…the older the less accurate.
Therefore I played the last days with these settings here:
This should persist the data per minute for approx. 1 month (31 days)
At the end I would like to have a sum of kWh over last month. The persisted data is kWh per day and looks like this:
So…a fundamental question: Is it even possible to get the sum out of that graph with something like that:
var Number temp = PHouseDay.sumSince(now.minusMonth(1))
Thanks & BR