Sunny Boy 2500U Installation and Operator’s Manual
SB2500U-11:NE - 24 - SMA Regelsysteme GmbH
4 Operation and Failure Indication LEDs
The inverter normally operates automatically, without user interaction and without any
maintenance. The inverter automatically turns itself off when a grid feeding is not
possible (e. g. at night).
The Sunny Boy automatically starts its grid feeding the next day once the solar radia-
tion is high enough. The inverter goes to standby mode if the radiation and the result-
ing electric input energy is too low and is therefore always ready for operation.
Each time the Sunny Boy starts up it runs a number of self test and safety proce-
dures which the user does not notice.
The user can obtain the inverter’s operating status from the 3 integrated LEDs on the
lid (see Table 4.1: Operation indication overview).
The green LED “Operation” describes the current operation of the Sunny Boy, see
chapter 4.1 “Operation Indicator”.
The red LED warns the user that the GFDI-fuse is defective. A description of this
situation and what has to be done in that case is given in chapter 4.2.
The yellow LED ”Failure“ indicates an internal or external failure that keeps the in-
verter from feeding the grid. The specific causes for this and how to avoid them are
described in chapter 4.3 “Failure Indication”.
The red and yellow LED combined indicate that the internal Ground Fault Detector
and Interupter (GFDI) has detected a ground fault in the PV panel. A description of
this situation and what has to be done in that case is given in chapter 4.2.
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