The following are daily power output charts of a solar PV inverter, which of charts shows a faulted (erroneous) data signature in your opinion?

a. 1

b. 2

c. 3

d. 4

e. All are valid signatures



Hey guys, im trying to solve this problem. I'm a student and new to this topic.
I think that 1 might be the faulty one, because killowatt cant be below zero? but i'm not sure.
I'd appreciate your guidance/help. Thanks in advance!

 

I agree with your reasoning. The weather can behave in strange ways and produce strange output curves, but an inverter should not be absorbing power.