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Still an active issue, got it! Removing stale label.

In the Docs:

IMHO the value_factor should be ANY number [-xxx.xxx, +xxx.xxx].
Values like "0.9, 0.5, 0.04" should scale the state down.
Values like "1.2, 25, 400.56" should scale the state up.
Negative values should make the state negative.

Also, should be specified per-entity - #607

We should add a simpler multiplier (or similar) property and deprecate value_factor to be removed at a later date (also see #608)

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. If this is still an active issue, please let us know!

Yeah, i also need that.

Having costs per kWh and a cost average for the last hour. So the line of costs per kWh is so small that you can not see any changes in the cent-values, so i have to multiply that bei 5 times, so i can see the price changes in the chart.

I was also looking for this as I have a forecasted solar radiation in W/m2, and it needed to be multiplied by a factor of 15.57 to equate to the same power as the area of my solar panels. Was looking to have a 'value_factor: 15.57' for that entity.