Interfaces and Functions


The inverter can be equipped or retrofitted with the following interfaces and functions:

User interface for monitoring and configuration

The product is equipped as standard with an integrated webserver, which provides a user interface for configuring and monitoring the product. The product user interface can be called up via the web browser if there is an existing connection to an end device (e.g. computer, tablet PC or smartphone).

SMA Speedwire

The product is equipped with SMA Speedwire as standard. SMA Speedwire is a type of communication based on the Ethernet standard. SMA Speedwire is designed for a data transfer rate of 100 Mbps and enables optimum communication between Speedwire devices within systems.

Class 1 wiring methods are to be used for field wiring connection to the terminals of the communication interface.

SMA Webconnect

The inverter is equipped with a Webconnect function as standard. The Webconnect function enables direct data transmission between the inverter and Sunny Portal (online monitoring system from SMA).

There are two Sunny Portal versions: the classical Sunny Portal (https://www.sunnyportal.com) and the newly developed Sunny Portal powered by ennexOS (https://ennexOS.sunnyportal.com). Both systems differ in their supported functions. With an existing user account, you can log into both portals as well as into Sunny Design (system planning software from SMA).

In a Sunny Portal system, up to four inverters with Webconnect function can be displayed together. A communication product (e.g. SMA Data Manager) is required for systems with more than four inverters.

The system must be registered in the classic Sunny Portal if the inverter is integrated into a local network and connected to the Internet via this network. With this connection, you have the possibility to view the data online in real time.

If the inverter is connected to the Internet via the cellular network, you must register the system in Sunny Portal powered by ennexOS. The communication with the inverters is optimized with regard to the data volume and availability of the inverter. No data can be viewed in real time. Note that the inverter must be equipped with a firmware version ≥ 2.04.88.R for connection via the cellular network.

WLAN

The product is equipped with a WLAN interface as standard. The inverter is delivered with the WLAN interface activated as standard. If you do not want to use WLAN, you can deactivate the WLAN interface.

In addition, the product has a WPS function. The WPS function is for automatically connecting the product to a network (e.g. via router) and establish a direct connection between the product and an end device.

Expanding the radio range in the WLAN network

In order to expand the radio range of the inverter in the WLAN network, you can install the Antenna Extension Kit accessory set in the inverter.

Modbus

The product is equipped with a Modbus interface. The Modbus interface is deactivated by default and must be configured as needed.

The Modbus interface of the supported SMA products is designed for industrial use – via SCADA systems, for example – and has the following tasks:

  • Remote query of measured values

  • Remote setting of operating parameters

  • Setpoint specifications for system control

Module slots

The inverter is standard-equipped with two module slots. The module slots are located on the communication assembly and allow additional modules to be connected (e.g. SMA Sensor Module). The modules are available as accessories. The installation of two identical modules is not permissible.

SMA RS485 Module

The inverters of type "SBx.x-1SP-US-40" can be retrofitted with the SMA RS485 Module.

By installing the SMA RS485 Module, the inverter is able to communicate with the energy meter of the SMA Revenue Grade Meter Kit.

Class 1 wiring methods are to be used for field wiring connection to the terminals of the communication interface.

Antenna Extension Kit

Within the WLAN network, the Antenna Extension Kit enables the radio range of the inverter to be upgraded (Information on assembly and connection see manual of the Antenna Extension Kit). The Antenna Extension Kit can be retrofitted.

SMA Sensor Module

The SMA Sensor Module has different interfaces for connecting various sensors (i.e. temperature sensor, irradiation sensor, anemometer or energy meter). The SMA Sensor Module converts the signals of the connected sensors and transmits them to the inverter. The SMA Sensor Module can be retrofitted.

SMA Cellular LTE Modem Kit

The inverter type "SBx.x-1SP-US-40" can be retrofitted with the SMA Cellular LTE Modem Kit. The inverter type "SBx.x-1TP-US-40" is equipped with SMA Cellular LTE Modem Kit as standard.

The SMA Cellular LTE Modem Kit allows the direct data transmission between the inverter and the internet portal Sunny Portal via the cellular network as an alternative to data transmission via Ethernet or WLAN. In addition, the SMA Cellular LTE Modem Kit enables the communication between the inverter and the energy meter.

The SMA Cellular LTE Modem Kit transmits up to four times a day a limited amount of data to Sunny Portal. The standard term of the mobile data plan for the SMA Cellular LTE Modem Kit is five years. All costs are covered within the term. No additional costs will be incurred. You have the possibility to extend the term of the mobile data plan. For this purpose, contact SMA Solar Technology AG. By using the SMA Cellular LTE Modem Kits, a local network connection is not absolutely necessary. However, it is recommended to be able to view all information regarding the system in Sunny Portal.

Energy meters in accordance with ANSI C12.20

The inverter type "SBx.x-1SP-US-40" can be retrofitted with the SMA Revenue Grade Meter Kit that in accordance with ANSI C12.20 includes an energy meter. The inverter must be equipped either with the SMA Cellular LTE Modem Kit or SMA RS485 Module to operate the SMA Revenue Grade Meter Kit. The inverter type "SBx.x-1TP-US-40" is equipped with an energy meter as standard.

The energy meter fulfills the accuracy class 0.5 in accordance with ANSI C12.20. The energy meter is a so called PV production meter intended to measure the generated energy of the inverter. The measured values of the energy meter can be used for billing purposes.

Grid Management Services

The inverter is a grid support interactive inverter.

The inverter was tested in accordance with the UL 1741 SA (2016-09-07) to be compliant with the source requirements documents of the states available at the time. For connecting the inverter to the utility grid, no additional grid monitoring equipment is necessary. A description of the tested functions and instructions on the activation and setting of functions can be found in the technical information "Grid Support Utility Interactive Inverters" at www.SMA-Solar.com.

PV Rapid Shutdown System Equipment

The inverter is a PV Rapid Shutdown System Equipment and performs the function of voltage reduction according to UL 1741 CRD PV Rapid Shutdown Systems 2015. When a rapid shutdown is triggered by disconnecting the utility grid, the inverter discharges independently on the AC side to ≤ 30 V within 30 seconds.

If a disconnection device is used in addition between the inverter and the PV array that disconnects the PV array in the case of a rapid shutdown, the inverter discharges independently on the DC side to ≤ 30 V within 30 seconds.

The electric discharge on the DC side is deactivated by default and must be activated manually after commissioning of the inverter via the user interface.

NOTICE - The inverter's Rapid Shutdown function is initiated by disconnecting the inverter from the AC grid voltage, for example, by opening the main PV system AC disconnect. The AC disconnect that serves as the Rapid Shutdown initiation device must be readily accessible and clearly marked in accordance with National Electrical Code®. The Rapid Shutdown status of the PV system will be indicated by the On/Off (Closed/Open) position of this AC disconnect. The Off (Open) position indicates that Rapid Shutdown has been initiated.

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.

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.

  1. 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 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.

SMA Smart Connected is activated during registration in Sunny Portal. In order to use SMA Smart Connected, it is necessary that the inverter is permanently connected to Sunny Portal and the data of the PV system operator and qualified person is stored in Sunny Portal and up-to-date.