We are using the ENTSO-E Time-of-Use-Tariff component which provides the current price in the channel _sum/GridBuyPrice. For debugging reasons I’d now like to display the historic prices. As I couldn’t find a possibility inside OpenEMS, I was trying to get it from the influxDB. But there I did not find th right field:
Can someone help me how to get/display the historical values?
Have you checked that the channel really holds a value? What is your persistentPriority configuration in the influxdb component?
very low
I assume that very low includes low, doesn’t it?
Can you post the query you used in influxdb? With above posted approach I did not find it.
Try a much higher value for the cycles. maybe 1 is too short for very low priority, since there are many values that are written to the InfluxDB.
Stupid me, human error. I was looking at the test-system (and not productive system). There I had disabled the component earlier. Thus no data… 
Looking at the productive installation, I can see data (with cycle of 1).
No I got a follow-up question. 
Where do I see the future prices? The upcoming prices of the next 1 - 3 days are known, but the table seems to only show the historic prices until now.
OpenEMS takes a snapshot of all channel values and stores them in influxdb. The future prices are not stored in a channel, so they are not written to influxdb. Currently they are only available in memory.
You can theoreticly fetch them via a jsonrpc request and store them somewhere yourself.
Maybe I misunderstand it. To me it seems to make sense to store them in a channel as well, to e.g. display them on the dashboard and to use them for controller.
