Sunny Boy User Manual

3 Product Overview
SMA Solar Technology AG
User ManualSBxx-US-1XP-41-BA-en-1120
Do not connect loads that require a stable electricity supply to the outlet for
secure power supply operation.
Secure power supply operation must not be used for loads that require a stable electricity
supply. The power available during secure power supply operation depends on the solar
irradiation on the PV system. Therefore, power output can fluctuate considerably depending
on the weather or may not be available at all.
• Do not connect loads to the outlet for secure power supply operation if they are
dependent on a stable electricity supply for reliable operation.
Multifunction Relay
The inverter is equipped with a multifunction relay as standard. The multifunction relay is an
interface that can be configured for the operating mode used by a particular system.
SMA ShadeFix
The inverter is equipped with the shade management system SMA ShadeFix. SMA ShadeFix uses
an intelligent MPP tracking system to determine the operating point with the highest output during
shading conditions. With SMA ShadeFix, inverters use the best possible energy supply from the PV
modules at all times to increase yields in shaded systems. SMA ShadeFix is enabled by default. The
time interval of SMA ShadeFix is usually six minutes. This means that the inverter determines the
optimum operating point every six minutes. Depending on the PV system or shading situation, it may
be useful to adjust the time interval.
String-failure detection
The self-learning string failure detection identifies to which of the three inverter DC inputs the strings
are connected. The self-learning string failure detection identifies if the connected string is
inoperable and is no longer contributing to the energy yield (e.g. due to damages such as a cable
break) and monitors the input to which the defective string is connected. If the error persists, an
event will be reported at the latest one day after the detection of the defective string. This prevents
partial failures of the PV array from being undetected for a long time and which will result in yield
losses. The self-learning string failure detections automatically identifies if a string has been repaired
and resets the event. If the defective string should no longer be connected, the event must be reset
manually.
Arc-Fault Circuit Interrupter (AFCI)
In accordance with the National Electrical Code
®
, the inverter has a system for DC arc fault
detection and interruption. The arc-fault circuit interrupter is listed in accordance with UL 1699B
Ed.1. A detected electric arc causes the inverter to interrupt feed-in operation for a short time and
to resume the feed-in operation automatically. If the installation conditions allow it, you can
deactivate the arc-fault circuit interrupter.
SMA Smart Connected
SMA Smart Connected is the free monitoring of the inverter via the SMA SunnyPortal. Thanks to
SMA Smart Connected, the PV system operator and qualified person will be informed automatically
and proactively about inverter events that occur.