Adding an existing device with old energy usage values actually makes it show as negative power in the GUI. Please fix. I have found no way of fixing this problem.
yeah, it would be nice to have some way to edit these negative values out. In my understanding it is a calculation for a given hour (not reflected in the database with a negative value). Eon’s w1000 import creates these negative values (up to one month’s worth of consumption) clearly rendering the whole Energy dashboard unusuable.