Hildebrand Glow or Solar Edge Surplus Solar?

Hello. I have setup automation for Dehumidifier and/or a heater to come on when grid power draw is below 5 watts. The reason I’m using this sensor is because I cannot find one for actual live surplus to grid. Anyone with the Hildebrand IHD or Solar Edge manage to work this out. Somehow Solar Edge calculates it on their own App but all I can find is a running total.