Sunny Boy 1800U
Installation and Operator’s Manual
SB2500U-11:NE
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24
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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 possi-
ble (e.g. at night).
The Sunny Boy automatically starts its grid feeding the next day once the solar radiation
is high enough. The inverter goes to standby mode if the radiation and the resulting elec-
tric 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 procedures
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 chap-
ter 4.1 “Operation Indicator”.
The
red
LED warns the user that the GFDI-fuse is defective. A description of this situa-
tion 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 inverter
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 situa-
tion and what has to be done in that case is given in chapter 4.2.
