SMA SUNNY BOY 3600TL - Connecting the PV Array (DC)

SMA Solar Technology AG 6 Electrical Connection
Installation Manual SB30-50TL-21-IA-en-21 45
6.4.4 Connecting the PV Array (DC)
1. Check the connection cable of the PV modules for
correct polarity and make sure that the maximum
input voltage of the inverter is not exceeded.
At an ambient temperature above 10°C, the
open-circuit voltage of the PV modules must not be
more than 90% of the maximum inverter input
voltage. If this is not the case, review the plant
design and the PV module circuitry. At lower ambient temperatures, the maximum input voltage
of the inverter could otherwise be exceeded.
2. Check strings for earth faults (see Section12.5 "Checking the PV Array for Earth Faults",
page84).
Danger to life due to high voltages in the inverter
• Before connecting the PV array, make sure that the miniature circuit-breaker is disconnected
and cannot be reconnected.
Excessive voltages can destroy the multimeter
• Only use multimeters with a DC input voltage range up to at least 1,000 V.
Destruction of the inverter due to overvoltage
If the voltage of the PV modules exceeds the maximum input voltage of the inverter, it could be
destroyed by the overvoltage. This will void all warranty claims.
• Do not connect any strings to the inverter which have an open-circuit voltage greater than the
maximum input voltage of the inverter.
• Check the plant design.
Danger to life due to electric shock.
• Do not connect any strings in which earth faults are present.
• Before connecting the DC cable, rectify the earth fault in the respective string.