RS485 Interface
The inverter can communicate via cables with special SMA communication products via the RS485
interface (information on supported SMA products at www.SMA-Solar.com). The RS485 interface
can be retrofitted and can be used in place of the SMA Speedwire/Webconnect interface in the
inverter.
Class 1 wiring methods are to be used for field wiring connection to the terminals of the
communication interface.
Grid Management Services
The inverter is equipped with service functions for grid management.
Depending on the requirements of the grid operator, you can activate and configure the functions
(e.g. active power limitation) via operating parameters.
SMA OptiTrac Global Peak
SMA OptiTrac Global Peak is an advancement of SMA OptiTrac and allows the operating point of
the inverter to follow the optimal operating point of the PV array (MPP) precisely at all times. In
addition, with the aid of SMA OptiTrac Global Peak, the inverter detects several maximum power
points in the available operating range, such as may occur particularly with partially shaded
strings. You can activate SMA OptiTrac Global Peak via the operating parameters (see Section 8.5
"Setting SMA OptiTrac Global Peak", page 39).
Arc-Fault Circuit Interrupter (AFCI)
In accordance with the
National Electrical Code
®
, Article 690.11, the inverter has a system for arc
fault detection and interruption.
An electric arc with a power of 300 W or greater must be interrupted by the AFCI in the time
specified by UL 699B. A tripped AFCI can only be reset manually. The 2011 edition of the
National Electrical Code
®
, Section 690.11, stipulates that newly installed PV systems attached to a
building must be fitted with a means of detecting and disconnecting serial electric arcs on the DC
side. If you prefer not to have that function, you can deactivate the arc-fault circuit interrupter via a
communication product (see Section 8.4, page 39).
Q on Demand 24/7
The inverter can supply reactive power by means of Q on Demand 24/7 covering the entire unit
circle around the clock (for details on the configuration refer to the Technical Information
"Integrated Plant Control and Q on Demand 24/7" at www.SMA-Solar.com).
Integrated Plant Control
The inverter can display the Q(V) characteristic curve specified by the grid operator by means of
Integrated Plant Control without measuring on the grid-connection point. The inverter can
automatically compensate equipment installed between the inverter and the grid-connection point
after having activated the function (for information on the system configuration refer to the Technical
Information "Integrated Plant Control and Q on Demand 24/7" at www.SMA-Solar.com).
4 Product Description
SMA Solar Technology AG
Installation Manual
STP12-24TL-US-IA-en-16
18
Содержание PVI 23TL
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