Safety
06
■ Surge protection devices (SPDs) for PV installation
Direct or indirect lightning strikes can cause failures. Surge is the main cause
of lightning damage to most devices. Surge voltage may occur at photovoltaic
input or AC output, especially in remote mountain areas where long distance
cable is supplied.
Consult professionals before installing SPDs.
The external lightning protection device can reduce the influence of direct
lightning strike, and the lightning protection device can release surge current
to the earth.
If the building installed with external light protection device is faraway from the
inverter location, in order to protect the inverter from electrical and mechan-
ical damage, the inverter should also install an external lightning protection
equipment.
In order to protect DC system, two-stage surge protection equipment is need-
ed between DC cable of inverter and photovoltaic equipment module.
Warning!
Over-voltage protection with surge arresters should be provided
when the PV power system is installed.
The grid connected inverter is tted with SPDs in both PV input
side and MAINS side.
by photovoltaic over voltage is not covered by warranty.
Installation position should be away from wet environment and corrosive sub-
stances.
After the inverter and power grid cut o the PV power supply, there will be a
certain amount of residual current in a short time, be cautious or it may lead
to serious personal injury and even high risk of death. Use a multimeter (im-
pedance at least 1 MΩ) to measure the voltage between the UDC and the
UDC- to ensure that the inverter port is discharged below the safe voltage
before starting operation (35 VDC).
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