SMA SUNNY CENTRAL - Manual (Page 29)

SMA Solar Technology AG Parameters
User Manual SC-BEN092751 29
6.1 Description of the Parameter Functions
The following parameters can be found in the menus.
Parameters marked with * may only be adjusted upon consultation with SMA.
Parameter Description of the function
Mpp Limit. Val.
VmppMin *
Minimum MPP voltage required for the Sunny Central to feed.
dVreference MPP tracking is possible within a range equal to 2 x dUreference. As soon as
the voltage drops or rises outside of this range, the inverter goes into "MPP
Search" mode.
Default setting: 80 V
Recommendation for operation with thin-film modules: 120 V
PsearchMpp * If the currently measured solar power drops below the value PsearchMpp for
the duration of TsearchMpp, the Sunny Central begins to search for the MPP
again.
TsearchMpp *
MPP Tracking
dVtrack *
During MPP tracking, the inverter changes the voltage in “dUtrack” steps at
“TcheckMpp” intervals before it selects the MPP.
TcheckMpp *
Mpp Factor
The start value for MPP tracking is obtained by multiplying the "MppFactor"
parameter by the measured open circuit voltage.
Default setting: 0.80
Recommendation for operation with thin-film modules: 0.70
TrackCnt During operation, the Sunny Central seeks the maximum power point. It checks
the voltage up to seven times (default setting) in one direction, e.g. always
toward the higher voltage. After the seventh time (at the latest), it also seeks
below the last voltage, in order to check whether the maximum power point has
decreased. If, for example, the Sunny Central finds a lower power point upon
the third increase, it seeks below the most recently checked voltage.
Start requirement
Operating Mode * MPP is set as a condition for starting up the inverter.
VpvStart
If Vpv ≥ UpvStart for the duration of Tstart, the Sunny Central can switch from
"Wait" mode to "Startup" mode. UpvStart must be adjusted for the solar
generator which is connected to the Sunny Central.
Tstart
Twait If, in three consecutive startup attempts, PpvStop has not been exceeded, the
next startup attempt will not occur before Twait has passed.