Condition wents not true because trigger is change everytime

Plugins & Plugin Development Program Logic (PLEG)
1

I want to make a condition that went true when the wattage usage is below 35 for morethan 5 minutes
I use the device meterkast as trigger. But because this updates everytime the condition get never true

t_Zonnig Meterkast: Energy usage goes below 35 watts
c_zonnig t_Zonnig and (t_Zonnig;Now > 5:00)

c_zonnig becomes never true because t_zonnig is changing evytime

How can i fix this

2

Use a device property for energy usage.
pEnergy Bound to the energy variable

Then create a condition:

cLowZonning pEnergy < 35 (Repeats turned OFF)
cZonning cLowZonnig and (cLowZonning; NOW > 5:00) (Repeats turned OFF)