PV Solar Installation: Common Mistakes and Best Practices 

In 2023, the Clean Energy Council (CEC), through inspections conducted by the Clean Energy Regulator, identified widespread non-compliant solar installations across Australia. As a result, the CEC suspended more than 150 accreditations and cancelled over 50 due to serious compliance breaches. 

This blog highlights the key issues commonly found during inspections and outlines  PV solar installation best practices to help installers maintain  solar compliance in Australia, ensure safety, and protect their professional standing. 

Poor roofing penetrations 

The cabling passes through roofs without fit-for-purpose flashings like dektites. Without proper sealing, water ingress can cause significant damage. Proper installation includes using a dektite, UV-stabilised sealant, and suitable cable glands. This is one of the most common  PV solar installation mistakes  that can lead to long-term system damage. 

Frequent earthing faults 

Incorrect installation of WEEBs (Washer Electrical Equipment Bonding) or earthing lugs can lead to electric shock and fire risks. All modules must be properly earthed with anti-corrosion protection applied. These  PV system issues  are often detected during audits and can result in serious safety breaches. 

Cabling issues 

Using mismatched connectors or loose cabling without proper conduit protection are another risk. Installers must ensure connectors match, conduits are labelled, and all entry points are sealed. This kind of improper cabling is a recurring cause of  grid-connected solar errors. 

Isolator failures 

Isolators need to be weather-protected and should be installed in shaded, weather-protected areas, properly sealed, and compliant with AS/NZS 5033 standards. 

Signage is often overlooked 

Signage is critical for future maintenance and emergency response. Installers must meet signage requirements under AS/NZS 5033, AS/NZS 4777, and AS/NZS 3000. Failing to install correct signage is a frequent reason for  solar compliance Australia  issues. 

Inverter protection from weather 

Installing inverters in direct sunlight can lead to premature degradation. They should be mounted in shaded, ventilated spaces. Positioning errors like these often show up during  solar panel troubleshooting. 

Good practices not only ensure compliance but protect systems, maintain accreditation and safeguard installer reputations in Australia’s growing solar industry.