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2026 Regulatory Review

Solar PV & Battery Storage (BESS): Managing 1000V DC Hazards and Lithium Thermal Runaway

By Marcus Vance, MIEAust CPEng (Senior Electrical Safety Consultant)
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Published: Oct 08, 2026
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8 min read

Key Regulatory Takeaways

  • Never disconnect DC connectors under electrical load in daylight.
  • Adhere strictly to AS/NZS 5139 non-combustible barrier rules for battery storage.
  • Install perimeter roof guardrails before solar panel staging.
  • Equip service vehicles with Class D and lithium-rated fire extinguishers.

High-Voltage DC & Battery Fire Safety in 2026

Solar photovoltaic systems and Lithium-ion Battery Energy Storage Systems (BESS) require specialized risk management combining high-altitude work with high-voltage direct current.

1. The High-Voltage DC Hazard

Solar strings generate up to 1000V DC under illumination. Unplugging MC4 connectors under current load creates sustained, dangerous electrical arcs.

2. AS/NZS 5139 Battery Compliance

Lithium battery installations must comply with strict fire isolation setbacks, non-combustible backing boards, and thermal monitoring alarms.

3. Rooftop Fall Prevention

All solar installers must operate with perimeter scaffold edge protection or certified static lines and energy-absorbing fall arrest harnesses.

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