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5.6 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 DC connectors are
not firmly in place, and the loss caused is not covered by the warranty.
• If the DC input cables are reversely connected or the positive and negative ter-
minals of different MPPT are shorted to ground at the same time, while the DC
switch is in the "ON" position, do not operate immediately. Otherwise, the inver-
ter may be damaged. 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.
• Use the DC connectors supplied with the product for DC cable connection. Us-
ing incompatible DC connectors may result in serious consequences, and the
device damage is not covered under warranty.
• Inverters do not support full parallel connection of strings (Full parallel connec-
tion refers to a connection method in that strings are connected in parallel and
then connected to the inverter separately).
• Do not connect one PV string to multiple inverters. Otherwise, the inverters
may be damaged.
User Manual 5 Electrical Connection
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