SMA America, LLC
6 Electrical Connection
Installation Manual
SB3-5TLUS22-IA-en-10
43
6.4 DC Connection
6.4.1 Safety During DC Connection
6.4.2 Conditions for the DC Connection
The inverter has two input areas A and B, both of which must be identically configured.
Requirements for the PV modules
☐ All modules in one input area must be the same type.
☐ The same number of series-connected PV modules must be connected to all strings in one input
area.
☐ All PV modules in one input area must be aligned identically.
☐ All PV modules in one input area must be at the same pitch.
☐ The limiting values for the input voltage and the input current of the inverter must be maintained
(see Section 11 "Technical Data", page 82).
☐ On the statistically proven coldest day of the year the open-circuit voltage of the PV array may
not exceed 600 V at full irradiation.
Cable requirements:
☐ Comprising copper in the form of solid or stranded wire, not fine-stranded wire.
☐ Conductor cross-section: 10 AWG to 6 AWG (5.3 mm² to 13.3 mm²)
☐ The DC cables must be designed for ambient temperatures of at least +194°F (+90°C).
☐ The DC cables must be designed in accordance with the installation requirements applicable
on site.
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.
