SMA SSM16-11 - Manual (Page 17)

SMA Solar Technology AG 3 Product Description
Installation Guide SSM16-24-IA-IEN105120 17
All the string currents are now compared to this mean value in the 5 minute polling interval. If all the
string currents lie within the set tolerance of 10%, no addition is carried out.
If, however, a string shows a string current of 6 A, then the difference between the actual string
current of 6 A and the tolerance limit of 5.5 A is added to the total. The difference is 0.5 A, which
is a deviation of 10% from the mean value. This difference of 10% is now added to the total until
the error sum of 20% is reached.
The error sum is reached when the error remains the same for two polling intervals. The data logger
sends the warning 380 "SMU".