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4 Product Overview SMA Solar Technology AG <br />Installation ManualSBxx-1SP-US-41-IA-xx-12 20 <br />CONTROLLED CONDUCTORS OUTSIDE THE ARRAY. OTHER EQUIPMENT INSTALLED IN OR <br />ON THIS PV SYSTEM MAY ADVERSLY AFFECT THE OPERATION OF THE PV RAPID SHUTDOWN <br />SYSTEM. IT IS THE RESPONSIBILITY OF THE INSTALLER TO ENSURE THAT THE COMPLETED PV <br />SYSTEM MEETS THE RAPID SHUT DOWN FUNCTIONAL REQUIREMENTS. THIS EQUIPMENT <br />MUST BE INSTALLED ACCORDING TO THE MANUFACTURER’S INSTALLATION MANUAL. <br />Parallel Operation of the DC Inputs A and B <br />The DC inputs A and B of the inverter can be operated in parallel and up to three strings can be <br />connected to it in parallel. As a result, as opposed to normal operation, up to three strings can be <br />connected directly to inverters with two DC inputs and up to four strings to inverters with three DC <br />inputs. The inverter automatically detects the parallel operation of the DC inputs A and B. <br />Secure power supply operation <br />You can connect an external outlet and a switch to the inverter in order to enable the outlet. In case <br />of a grid failure, the outlet supplies a load with current from the PV system. When the outlet is <br />enabled via the switch, the load is supplied with current from the PV system. The inverter <br />automatically regulates the energy supply of the outlet depending on the solar irradiation on the PV <br />system. When the outlet is enabled and a load is supplied with current from the PV system, the <br />inverter is disconnected from the utility grid and does not feed into the utility grid. <br />Do not connect loads that require a stable electricity supply to the outlet for <br />secure power supply operation. <br />Secure power supply operation must not be used for loads that require a stable electricity <br />supply. The power available during secure power supply operation depends on the solar <br />irradiation on the PV system. Therefore, power output can fluctuate considerably depending <br />on the weather or may not be available at all. <br />• Do not connect loads to the outlet for secure power supply operation if they are <br />dependent on a stable electricity supply for reliable operation. <br />Multifunction Relay <br />The inverter is equipped with a multifunction relay as standard. The multifunction relay is an <br />interface that can be configured for the operating mode used by a particular system. <br />SMA ShadeFix <br />The inverter is equipped with the shade management system SMA ShadeFix. SMA ShadeFix uses <br />an intelligent MPP tracking system to determine the operating point with the highest output during <br />shading conditions. With SMA ShadeFix, inverters use the best possible energy supply from the PV <br />modules at all times to increase yields in shaded systems. SMA ShadeFix is enabled by default. The <br />time interval of SMA ShadeFix is usually six minutes. This means that the inverter determines the <br />optimum operating point every six minutes. Depending on the PV system or shading situation, it may <br />be useful to adjust the time interval. <br />String-failure detection <br />The self-learning string failure detection identifies to which of the three inverter DC inputs the strings <br />are connected. The self-learning string failure detection identifies if the connected string is <br />inoperable and is no longer contributing to the energy yield (e.g. due to damages such as a cable <br />break) and monitors the input to which the defective string is connected. If the error persists, an <br />EN <br />G <br />L <br />I <br />S <br />H <br />534 S Sycamore St <br />- 10110979707/01/22