Sungrow SG250HX-US, Руководство пользователя

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5.8 DC Cable Connection
The PV string will generate lethal high voltage when exposed to sunlight.
• Respect all safety instructions listed in relevant documents about PV strings.
• Make sure the PV array is well insulated to ground before connecting it to the
inverter.
• Make sure the maximum DC voltage and the maximum short circuit current of
any string never exceed inverter permitted values specified in "Technical Data".
• Check the positive and negative polarity of the PV strings, and connect the PV
connectors to corresponding terminals only after ensuring polarity correctness.
• During the installation and operation of the inverter, please ensure that the posi-
tive or negative electrodes of PV strings do not short-circuit to the ground. Oth-
erwise, an AC or DC short-circuit may occur, resulting in equipment damage.
The damage caused by this is not covered by the warranty.
• Electric arc or contactor over-temperature may occur if the PV connectors are
not firmly in place, and SUNGROW shall not be held liable for any damage
caused.
• If the DC input cables are reversely connected and the DC switch has been ro-
tated to "ON", do not operate immediately. Otherwise, the inverter may be dam-
aged. Please turn the DC switch to "OFF" and remove the DC connector to
adjust the polarity of the strings when the string current is lower than 0.5 A.
The following requirements about PV string connection must be met. Otherwise, it
may cause irreversible damage to the inverter, which is not covered by the
warranty.
• Mixed use of different brand or model of PV modules in one MPPT circuit, or PV
modules of different orientation or angles in a string may not damage inverter
but will cause system bad performance!
5.8.1 PV Input Configuration
• As shown in the figure below, the inverter is provided with multiple PV inputs: PV inputs
1~12; and each PV input is designed with an MPP tracker.
• Each PV input operates independently and has its own MPPT. In this way, string struc-
tures of each PV input may differ from each other, including PV module type, number of
PV modules in each string, angle of tilt, and installation orientation.
5 Electrical Connection User Manual