I’ve got energy market spot prices stored in 24 different number items. They are named Energy_Price_Hour00, Energy_Price_Hour01 and so on.
I would like to show a bar graph in a sitemap showing the energy prices hour by hour. (I don’t intend to show historic values, just current values for my 24 items) Can it be done easily?
That’s not how these graphs are intended to work indeed. The same applies to rrdj4, that should also be time series of a single item.
My suggestion would be to have a single item containing the price that is updated every hour, and persisting that with the persistence service of your choice. Then you can graph the energy price of the last 24 hours. I think that is the closest you can get.