SMA 3000TL-US, Installation Manual

Page: 39 / 88

SMA America, LLC 6 Electrical Connection
Installation Manual SB3-5TLUS22-IA-en-12 39
13. If the display is raised, lower the display and tighten
the display screw by hand. If present, do not kink
the adjacent Zigbee
®
antenna cable.
6.4 DC Connection
6.4.1 Safety during DC Connection
6.4.2 Conditions for the DC Connection
The inverter is transformerless and has no galvanic isolation. Therefore, the inverter may only be
operated with ungrounded PV arrays. Furthermore, the PV array must be installed in accordance with
the
National Electrical Code
®
, Article 690.35 "Ungrounded Photovoltaic Power Systems" and the
locally valid regulations for ungrounded PV arrays. Additionally, the PV array (PV modules and
cabling) must have protective insulation and the PV modules used must be suitable for use with this
inverter.
The inverter has two input areas A and B. The strings per input area must be designed identically.
Requirements for the PV Modules
☐ The limiting values for the maximum system voltage and the maximum short-circuit current of the
inverter must not be exceeded (see Section 13 "Technical Data", page 77).
☐ The PV modules and strings connected to one input area should have the same electrical
properties based on the manufacturer information.
Danger to life due to high voltages on DC conductors
Risk of death or serious injury due to electric shock from touching a DC conductor.
• Do not touch the DC conductors.
Danger of electric arcs due to reversed-pole DC conductors
Dangerous electric arcs can form when the DC conductors are connected to the incorrect poles on
the inverter.
• Only make the DC connection as described in this document.
• Ensure the correct polarity of the DC conductors.