SMA SB 3000TL-20 Installation - Manual (Page 39)

SMA Solar Technology AG Electrical Connection
Installation Guide SB30TL_40TL_50TL-IA-IEN120231 39
5.4.5 Connecting the PV Generator (DC)
1. Check the connection cables 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.
Otherwise, check the system design and the PV
module connection. If this is not done, the maximum
inverter input voltage can be exceeded at low
ambient temperatures.
2. Check the strings for ground faults, as described in section 11.1 ”Checking the PV Generator
for a Ground Fault” (page 79).
DANGER!
Danger to life due to high voltages in the inverter.
• Before connecting the PV generator, ensure that the line circuit breaker is switched
off and that it cannot be reactivated.
NOTICE!
Excessive voltages can destroy the measuring device!
• Only use measuring devices with a DC input voltage range up to at least 1,000 V.
NOTICE!
Destruction of the inverter due to overvoltage.
If the voltage of the PV modules exceeds the maximum input voltage of the inverter, it can
be destroyed by the overvoltage. All warranty claims become void.
• Do not connect strings with an open circuit voltage greater than the maximum input
voltage of the inverter.
• Check the system design.
DANGER!
Risk of lethal electric shock.
• Do not connect strings with ground faults.
• First, rectify the ground fault in the respective string.