Manual
3 Product Overview
SMA Solar Technology AG
User Manual SBxx-US-1XP-40-BA-en-13 19
If the available accessory communication set for TS4-R module technology components
(SMARooftopCommunicationKit) is installed in the inverter, the secure power supply operation is
no longer available. The Rooftop Communication Kit supports the Rapid Shutdown function. The AC
circuit breaker in the system is simultaneously the Rapid Shutdown initiator. In the event of a grid
failure or when operating the Rapid Shutdown initiator, the inverter is also disconnected from
voltage sources on the DC side. Thus the supply of the outlet for secure power supply operation
can no longer be guaranteed.
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.
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: In order to restart feed-in
operation, the feed-in operation must be activated manually. 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 SunnyPortal. Thanks to
SMA Smart Connected, the PV system operator and qualified person will be informed automatically
and proactively about inverter events that occur.
SMA Smart Connected is activated during registration in SunnyPortal. In order to use SMA Smart
Connected, it is necessary that the inverter is permanently connected to SunnyPortal and the data
of the PV system operator and qualified person is stored in SunnyPortal and up-to-date.