Inverters In Off-Grid Systems

SMA America, LLC 3 Values of the Parameters in Off-grid Operation
Technical information SB-OffGrid-TI-US-en-14 9
3 Values of the Parameters in Off-grid Operation
The setting of the "Default" parameter to "OFF_Grid" automatically sets the PV inverter parameters to the values
listed in the following table:
Parameters Unit Value
Test current mA Off (MSD=0)
Vac.Min V 106 (‒12% Vac nom)
Vac.Max V 132 (+10% Vac nom)
Fac-delta‒
Lower range in which the Sunny Boy is active relative to f
0
Hz ‒3.0
(starting from the base frequency f
0
)
Fac-max+
Upper range in which the Sunny Boy is active relative to f
0
Hz +3.0
(starting from the base frequency f
0
)
dFac-Max
Max. rate of change
Hz 4
Fac-start delta
Frequency increase relative to f
0
, at which point the power
adjustment via frequency begins.
Hz 1
(starting from the base frequency f
0
)
Fac-limit delta
Frequency increase relative to f
0
, at which point the power
adjustment via frequency ends. The output power of the
Sunny Boy at this point is 0 W.
Hz 2
(starting from the base frequency f
0
)