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Safety
If the building installed with external light protection device is far
away from the inverter location, in order to protect the inverter from
electrical and mechanical damage, the inverter should also install an
external lightning protection equipment.
In order to protect DC system, two-stage surge protection equipment
is needed between DC cable of inverter and photovoltaic equipment
module.
In order to protect the AC system, the level 2 surge protection
equipment should be installed at the AC output, located between
the inverter and the grid. Installation requirements must comply with
IEC61643-21 standard.
All DC cables shall be installed in a distance as short as possible, and
the positive and negative cables of the same input need to be
bundled together to avoid causing loops in the system. Minimum
distance installation and binding requirements also apply to auxiliary
grounding and shielding grounding conductors.
Warning!
Ø Surge protection devices (SPDs) for PV installation
A photovoltaic module used on the inverter must have a IEC61730A
rating, and the total open circuit voltage of the photovoltaic string /
array is lower than the maximum rated DC input voltage of the
inverter. Any damage caused by photovoltaic over voltage is not
covered by warranty.
Installation position should be away from wet environment and
corrosive substances.
After the inverter and power grid cut off 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 (impedance 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).
Over-voltage protection with surge arresters should be
provided when the PV power system is installed.
The grid connected inverter is fitted with SPDs in both
PV input side and MAINS side.
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.
Please 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.
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