Attention Solar DIYers: When do you need to call a Licensed Electrician?
Published: June 24, 2025
Introduction
LUX Solar's mission centers on enabling everyone to achieve energy independence cost-effectively and efficiently, including through prewired "plug and play" kits. However, certain off-grid solar installations—and some caravan solar setups—legally require a prescribed electrical worker or registered electrician. Even when regulations don't mandate professional installation, DIY approaches carry serious risks without proper expertise.
What Can Go Wrong?
Electrocution fatalities have occurred with off-grid solar systems, demonstrating that dangers extend beyond regulatory checkboxes. A Queensland investigation documented an electrocution involving a system operating at approximately 100VDC within extra low voltage parameters (under 50VAC or 120V ripple-free DC). Despite the person not being required to hold a license, the incident highlighted genuine installation hazards.
Solar PV work demands specialized knowledge regarding electrical safety and DC voltage requirements.
Issues to Consider
Electrical current hazards: Even at extra low voltage, solar systems generate substantial current capable of producing dangerous arcs and burns. Panel connections and disconnections present particular risks since "solar panels operating at extra low voltage create electricity while the sun shines."
Health vulnerabilities: Pre-existing conditions compromise safety at low voltages—cuts, wounds, and ulcers reduce electrical resistance, while pacemakers face aggravation risks.
Environmental factors: High humidity, wet seasons, and heavy rainfall increase hazard levels, especially at higher voltage ranges.
Location challenges: Remote installations may hinder emergency assistance, necessitating enhanced precautions.
Height and fall risks: Roof-mounted systems introduce additional dangers including ladder safety concerns.
Fire prevention: Inadequate weatherproofing of electrical components creates ignition hazards.
Isolation standards: Proper safety procedures for equipment disconnection must be followed.
Voltage effects depend on magnitude, body contact points, moisture levels, and current duration.
New Zealand Regulatory Requirements
According to Worksafe guidance, licensed electricians must handle installations and maintenance of solar PV systems operating at or exceeding low voltage thresholds (greater than 120 volts DC; greater than 50 volts AC).
Key consideration: Unfamiliar with your system voltage? Consult an electrician immediately.
System Configurations
PV systems combine various voltage levels—potentially mixing extra low voltage (ELV) and low voltage (LV) components. Configurations may include parallel mains inverters or standalone systems with inverters and battery storage.
Prescribed Electrical Work (PEW)
Installation of conductors and attached fittings constitutes PEW. Inverters qualify as fittings rather than appliances, making their installation part of the prescribed work requiring certification.
Mains-Connected Systems
Grid-tied systems with low-voltage inverters demand compliance with standards AS/NZS 3000 and AS 4777.1. This high-risk PEW requires certification and a record of inspection (ROI).
Low-Voltage Systems
LV-operated PV systems require PEW certification, compliance with AS/NZS 3000 and AS/NZS 5033, and inspection documentation for the LV-DC component.
Mixed Voltage Systems
Combined ELV/LV systems must meet AS/NZS 3000 and AS/NZS 5033 standards. The ELV-DC side doesn't require certification or inspection, but the LV-AC side (including inverters) does. Independent supplies without mains parallel connections skip inspection requirements.
Extra-Low-Voltage-Only Systems
ELV-exclusive systems require AS/NZS 3000 and AS/NZS 5033 compliance but don't constitute PEW, so certification and inspection aren't mandatory.
Conclusion
LUX Solar emphasizes that solar installation should proceed safely, compliantly, and correctly while remaining cost and time-efficient. Safety remains the paramount priority.