SMA America, LLC
Messages
Installation Guide
SB20_25_30HFUS-eng-IUS113711
85
8
< Wait for grid voltage >
< Grid Failure >
< Check fuse >
• Check fuse.
• Check AC installation.
• Check whether there is a general
black-out.
33
< Unstable operation >
The supply at the DC input of the
Sunny Boy is not sufficient for a stable
operation.
• Wait for higher sun irradiation.
• If this event recurs at medium sun
irradiation, check the PV plant design
and correct connection of the
PV array.
34
< DC overvoltage >
< Disconnect the generator >
The DC input voltage is too high at the
Sunny Boy.
• Immediately disconnect the Sunny
Boy from the PV array, as described
in section 8.1 ”Disconnect the Sunny
Boy from Voltage Sources”
(page 65). Otherwise the Sunny Boy
can be destroyed.
• Check the DC voltage of the strings
for adherence to the maximum input
voltage of the Sunny Boy, before you
re-connect the Sunny Boy to the
PV array.
35
< Isolation resistance >
The Sunny Boy has detected a ground fault
in the PV array.
• Check the strings for ground faults, as
described in section 11.1 ”Checking
the PV array for Ground Fault”
(page 88).
• The installer of the PV array must
remedy the ground faults before you
re-connect the affected string.
• Check the SMA Plug-in Grounding.
The fuse may be cleared.
38
< DC Overcurrent >
< Check Generator >
An overcurrent condition occurs on the
DC side of the Sunny Boy and the Sunny
Boy switches off.
If this event occurs often:
• Check the layout and the wiring of
the PV array.
39
< Wait for DC start conditions >
< Start conditions not achieved >
The input power or the voltage of the
PV modules is not sufficient for feeding into
the grid.
• Wait for higher sun irradiation.
• If this event recurs at medium sun
irradiation, check the PV plant design
and correct connection of the
PV array.
Event No. Display message and cause
Corrective measures
