SMA SB3.0-1SP-US-41 Installation Manual page 20

4 Product Overview
ON THIS PV SYSTEM MAY ADVERSLY AFFECT THE OPERATION OF THE PV RAPID SHUTDOWN
SYSTEM. IT IS THE RESPONSIBILITY OF THE INSTALLER TO ENSURE THAT THE COMPLETED PV
SYSTEM MEETS THE RAPID SHUT DOWN FUNCTIONAL REQUIREMENTS. THIS EQUIPMENT
MUST BE INSTALLED ACCORDING TO THE MANUFACTURER'S INSTALLATION MANUAL.
Parallel Operation of the DC Inputs A and B
The DC inputs A and B of the inverter can be operated in parallel and up to three strings can be
connected to it in parallel. As a result, as opposed to normal operation, up to three strings can be
connected directly to inverters with two DC inputs and up to four strings to inverters with three DC
inputs. The inverter automatically detects the parallel operation of the DC inputs A and B.
Secure power supply operation
You can connect an external outlet and a switch to the inverter in order to activate the outlet. In
case of a grid failure, the outlet supplies a load with current from the PV system. When the outlet is
activated via the switch, the load is supplied with current from the PV system. The inverter
automatically regulates the energy supply of the outlet depending on the solar irradiation on the PV
system. When the outlet is activated and a load is supplied with current from the PV system, the
inverter is disconnected from the utility grid and does not feed into the utility grid.
If the available accessory communication set for TS4-R module technology components
(SMA Rooftop Communication Kit) 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.
No secure power supply operation when using PV array disconnect switch
as per the SunSpec interoperability specification
The secure power supply operation is not available if the Rapid Shutdown function of the
inverter is activated and the PV array disconnect switches are used in accordance with the
SunSpec Interoperability Specification.
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.
20 SBxx-1SP-US-41-IA-xx-10
SMA Solar Technology AG
Installation Manual