6.5 Grounding the inverter
The inverter must be connected to the AC grounding conductor of the power dis-
tribution grid via the ground terminal (PE) .
According to the relevant provisions of IEC 61643 -32 "Connecting to photovoltaic
devices surge protectors - selection and use of guidelines", whether for household
or outdoor photovoltaic power plants, it is necessary to ensure the implementation
of lightning protection measures for photovoltaic systems:
The lightning protection measures for photovoltaic systems shall
be carried out in accordance with the corresponding national
standards and IEC standards. Otherwise, photovoltaic devices
such as components, inverters and power distribution facilities
may be damaged by lightning.
In this case, the company does not carry out warranty and as-
sumes any responsibility.
1
Lightning pro-
tection device
Fig 6.14
1) It is generally recommended to install lightning protection devices (such as
lightning rods / lightning protection belts and down conductors) to prevent light-
ning from hitting the PV array.
2) Lightning protection devices and down-conductors and related equipment in
photovoltaic systems (including photovoltaic panels, inverters, cables, power dis-
tribution equipment) should maintain a safe separation distance S.
Suggested value of S: According to the general 5 storey height (about 15m) build-
ing roof, S takes 2.5m enough, this distance can be simplified according to the
inverse relationship of the floor height.
Because of the transformerless design, the DC positive pole and
DC negative pole of PV arrays are not permitted to be grounded.
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