Solar arrays and batteries can continue supplying fault current even when the grid is off. Safety depends on competent design, compatible components, correct installation, commissioning and maintenance. Warning signs should never be ignored.
Control DC connection risks
Use connectors intended to mate together, correctly crimped with suitable tools. Avoid mixed connector types, exposed joints and unsupported cables. DC isolators, fuses and breakers must have the correct voltage, current and interrupting ratings.
Protect battery circuits
Battery cables can carry very high current. Keep runs appropriate, protect conductors near the source, secure terminals and follow battery requirements for spacing, ventilation, communications and temperature.
Provide earthing and surge protection
Module frames, mounting, equipment enclosures and distribution need an engineered bonding and earthing approach. Site exposure and local requirements inform lightning and surge protection.
Respond to warning signs
Hot smells, discoloration, buzzing, repeated trips, melted connectors, swelling batteries, water entry or unexplained shutdowns require isolation by a competent person and prompt inspection. Do not open energised equipment without qualification.
Low price never compensates for unsafe protection, cabling or workmanship.
Important: This educational article is not a site-specific electrical design, financial valuation or guarantee of system performance. Final decisions require a load assessment, site inspection and appropriately qualified professionals.
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