SMA Sunny Boy Control - Manual (Page 126)

Sunny Boy Control
SMA Technologie AG
User Manual SUNBC-14:NE0206 122
Parameters of Profile 2
Symbol Explanation Comment
Input parameters
Pac Total system power output Sum of the “Pac” of all Sunny Boys
(Note: Unit = kW)
+Gi Module irradiation Measured with pyranometer or refer-
ence cell
-+Tam Ambient temperature Measured with PT100
System constants
+A Total module surface Surface of all modules installed
+etaM Module efficiency approx. 0.9*etaSTC
Secondary (derived) parameters
+Eac Yield Derived from Pac
+Hi Irradiation (energy) Derived from +Gi
+Enom Nominal (theoretical) yield Derived from +Hi and +etaM
Resulting system characteristics
+etaPV System
efficiency Current output & input power
+PR Performance ratio Daily yield at nominal yield
Table 7.21: Parameters of Profile 2
After loading Profile 2, the following variables have to be adjusted to the existing
system configuration.
•
Gain of Analog input 1: Signal conversion to W/m 2 , default = 150
•
+A : Module surface, default = 10 m 2
•
+etaM: Module efficiency, default = 14 %
(usually approx. 0.9*etaM, STC-check module specifications; STC = Standard
Test Conditions)
•
+Mon1: Adjust tolerances to system performance.
No further settings and adjustments are necessary. All other parameters are calcu-
lated automatically.