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VC150 Installation and Operation Manual

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LIGHTNING PROTECTION

MEASURES

LEVEL 1 – NO PROTECTIVE MEASURES – NOT RECOMMENDED BY DULAS LTD

Failure to provide protection measures against lightning strike risks damage to the equipment. In the event

of lightning striking the roof mounted Solar Array, high voltage may be conducted towards the refrigerator

system. This high voltage may damage the electronic components of the system.

LEVEL 2 – LIMITED PROTECTIVE MEASURES (Normally Supplied)

We strongly recommend that at least this level of protection be installed – see figure 1.

Install an earth electrode (earth rod) (A) outside the building – the earth rod should be at least 2m long.

Connect the earth rod with good quality wire (at least 6mm²) to the Solar Array and support structure (wire

B). The earth wire should follow the shortest and straightest path between the support structure and the

earth rod.

LEVEL 3 - FULL LIGHTNING CONDUCTOR SYSTEM (Not Supplied)

Assess the risk of lightning strike. Look at other local buildings – are they fitted with lightning conductors?

Ask local people if TV aerials etc often get struck?

If the installation is at high risk of lightning strike then an additional lightning conductor and separate earth

rod should be installed – see figure 2.

In addition to level 2 protection, install a second earth electrode (D). The distance between the two earth

electrodes must be more than their length. Erect an Air Terminal or Lightning Conductor (D) next to the

second earth electrode. The Air Terminal must exceed the height of the Solar Array such that the Solar

Array falls within a 45º cone centred on the Air Terminal – this is the area that is protected by the Air

Terminal.

Figure 1. Figure 2.

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Dulas Solar VC150 Instruções de Operação Página 12