34
INSTALLATION - WIRING
WIRING
Only UV-resistant cables and connectors approved for outside use should be used. PV cable must be
marked or labelled in accordance with AS/NZS 5033.
To minimise the risk of indirect lightning strikes, avoid forming closed loops when designing the system.
Check to ensure that system wiring is correct before commissioning modules. If the measured open circuit
voltage (V
oc
) and short circuit current (I
sc
) differ from specifications, a wiring fault may be present.
Recommended cable size for plug connectors is 4 – 6 mm
2
, with an operating temperature range of -40 to
+120ºC. Plug connectors are polarised and should be firmly connected. All connections should be secure,
tight and electrically and mechanically sound. Correct DC polarity should be observed at all times. Plug
connectors should never be used to turn the system on or off (i.e. do not connect or disconnect plug
connectors under load conditions).
Only use plug connectors supplied with your Solahart PV system, or which are the same type/model and
from the same manufacturer as those on the PV module. Ensure that all plug connectors and plug wiring are
in good electrical and mechanical condition and are not subjected to mechanical stress.
Ensure that all materials meet system requirements such as maximum voltage, current, moisture and
temperature when exposed to sunlight.
Electrical ratings of the PV modules are within 3% of measured values at Standard Test Conditions (STC).
Under normal conditions, a photovoltaic module may experience conditions that produce more current and/or
voltage than that reported under STC. When designing a system, allow for increased output of a module as a
result of conditions different to STC in accordance with the Clean Energy Council’s “Grid-Connected Solar
PV System - Design Guidelines for Accredited Installers” and AS/NZS 5033.
Ensure cables are fixed to the mounting structure and are not in contact with the roof or rear surface of
module(s) by using restraining devices which are sunlight and UV-resistant.
Note:
Plastic cable ties are not to be used as primary means of support.
A roof flashing such as a Dektite® must be used where wiring penetrates tile or
metal roofing. Flashings must be sealed using an appropriate waterproofing
compound such as silicone.
All wiring must be protected from mechanical damage and external wiring must be
protected from UV and mechanical damage in such a manner that it will last the life
of the system. All conduits shall comply with AS/NZS 2053.1 and if exposed to
sunlight must be suitably UV rated and marked with the letter “T”. Do not install
wiring such that it is subject to permanent tension.
COMPONENT PLUG AND DC CABLE SIZING TABLE
Cabling
Plug
Cable Size
Plug Rating
Module fly leads
Pre crimped on fly leads
4 mm
2
IP67
Module DC extension leads
Supplied in BOS Kit
Min 4 mm
2
IP67
Wiring – Roof isolator to inverter isolator
(a)
Not required – hard wired
Min 4 mm
2
N/A
Wiring – Inverter isolator to inverter
(b)
Supplied in BOS Kit for
Power-One/ABB inverters or as
supplied with SMA inverters.
Min 4 mm
2
IP67
(a)
= DC cable supplied by installer.
(b)
= DC cable supplied by installer for SMA inverters only.
All cables/wiring are double insulated Solar DC type cable.
It is recommended the maximum voltage drop between the PV array and the inverter is 3%.
Dektite
